Icom IC-746PRO User Manual

INSTRUCTION MANUAL

HF/VHF ALL MODE TRANSCEIVER

i746PRO

This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

FOREWORD

PRECAUTIONS

We understand that you have a choice of many different radios in the market place. We want to take a couple of moments of your time to thank you for making the IC-746PRO your radio of choice, and hope you agree with Icom’s philosophy of “technology ﬁrst”.Many hours of research and development went into the design of your IC-746PRO.

Rather than completely redesigning all areas to create a new radio, the engineering team at Icom decided to follow in the footsteps of the IC-746 (one of the best value transceivers in the marketplace) with the new “PRO.” Focused on real world improvements compiled over the last few years from letters, phone calls, EMails and newsgroup postings, the engineering team at Icom is proud to say “many of these changes were compiled from a list of suggestions from you, the amateur radio operator!”

FEATURES

• 32-bit Floating point DSP and 24-bit AD/DA converter

• DSP IF Filter creates 102 types of ﬁlter

• All mode capability covering 160–2 m

• 100 Watt continuous duty cycle

• All mode digital modulation and demodulation

• RTTY demodulator and decoder

• Twin Pass Band Tuning

• RF speech compression with selectable pass band

• Microphone Equalizer

• SSB/CW synchronous tuning

IMPORTANT

READ THIS INSTRUCTION MANUAL CAREFULLY before attempting to operate the

transceiver.

SAVE THIS INSTRUCTION MANUAL. This

manual contains important safety and operating instructions for the IC-746PRO.

EXPLICIT DEFINITIONS

WORD DEFINITION

WARNING

CAUTION Equipment damage may occur.

NOTE

Personal injury, ﬁre hazard or electric shock may occur.

If disregarded, inconvenience only. No risk or personal injury, fire or electric shock.

R WARNING RF EXPOSURE! This device emits

Radio Frequency (RF) energy. Extreme caution should be observed when operating this device. If you have any questions regarding RF exposure and safety standards please refer to the Federal Communications Commission Ofﬁce of Engineering and Technology’s report on Evaluating Compliance with FCC Guidelines for Human Radio Frequency Electromagnetic Fields (OET Bulletin 65).

R WARNING HIGH VOLTAGE! NEVER attach an

antenna or internal antenna connector during transmission. This may result in an electrical shock or burn.

R NEVER apply AC to the [DC13.8V] jack on the trans-

ceiver rear panel. This could cause a ﬁre or ruin the transceiver.

R NEVER apply more than 16 V DC, such as a 24 V

battery, to the [DC13.8V] jack on the transceiver rear panel. This could cause a ﬁre or ruin the transceiver.

R NEVER let metal, wire or other objects touch any in-

ternal part or connectors on the rear panel of the transceiver. This may result in an electric shock.

NEVER expose the transceiver to rain, snow or any liquids.

AVOID using or placing the transceiver in areas with tem-

peratures below –10°C (+14°F) or above +60°C (+140°F). Be aware that temperatures on a vehicle’s dashboard can exceed 80°C (+176°F), resulting in permanent damage to the transceiver if left there for extended periods.

AVOID placing the transceiver in excessively dusty environments or in direct sunlight.

AVOID placing the transceiver against walls or putting anything on top of the transceiver. This will obstruct heat dissipation.

Place unit in a secure place to avoid inadvertent use by children.

During mobile operation, DO NOT operate the transceiver without running the vehicle’s engine. When the transceiver’s power is ON and your vehicle’s engine is OFF, the vehicle’s battery will soon become exhausted.

Make sure the transceiver power is OFF before starting the vehicle. This will avoid possible damage to the transceiver by ignition voltage spikes.

During maritime mobile operation, keep the transceiver and microphone as far away as possible from the magnetic navigation compass to prevent erroneous indications.

BE CAREFUL! The heatsink will become hot when operating the transceiver continuously for long periods.

BE CAREFUL! If a linear ampliﬁer is connected, set the transceiver’s RF output power to less than the linear ampliﬁer’s maximum input level, otherwise, the linear ampliﬁer will be damaged.

Use Icom microphones only (supplied or optional). Other manufacturer’s microphones have different pin assignments, and connection to the IC-746PRO may damage the transceiver.

TABLE OF CONTENTS

ert

FOREWORD ........................................ i

IMPORTANT ........................................ i

EXPLICIT DEFINITIONS ..................... i

PRECAUTIONS ................................... i

TABLE OF CONTENTS ...................... ii

QUICK REFERENCE GUIDE ........ I–X

■ Installation ....................................... I

■ Operation ....................................... III

■ Your ﬁrst contact ........................... IV

■ Ready to call CQ? ......................... IX

1 PANEL DESCRIPTION ........... 1 – 12

■ Front panel ..................................... 1

■ Rear panel ...................................... 7

■ LCD display .................................... 9

■ Multi function switches .................. 11

■ Microphone (HM-36) .................... 12

2 INSTALLATION AND

CONNECTIONS ................... 13 –17

■ Unpacking .................................... 13

■ Selecting a location ...................... 13

■ Grounding ..................................... 13

■ Antenna connection ...................... 13

■ Required connections ................... 14

■ Advanced connections ................. 15

■ Power supply connections ............ 16

■ Linear ampliﬁer connections ......... 17

■ External antenna tuner

connections .................................. 17

3 BASIC OPERATION ............. 18–25

■ When ﬁrst applying power

(CPU resetting) ............................. 18

■ Initial settings ................................ 18

■ Selecting an operating band ........ 19

■ Selecting VFO/memory mode ...... 20

■ VFO operation .............................. 20

■ Frequency setting ......................... 21

■ Operating mode selection ............ 23

■ Volume setting .............................. 23

■ Squelch and receive (RF)

sensitivity ...................................... 24

■ Basic transmit operation ............... 25

4 RECEIVE AND TRANSMIT .. 26 –46

■ Operating SSB ............................. 26

■ Operating CW ............................... 27

■ Electronic keyer functions ............ 29

■ Operating RTTY (FSK) ................. 35

■ RTTY functions ............................. 36

■ Operating AM ............................... 40

■ Operating FM ............................... 41

■ Repeater operation ....................... 44

5 FUNCTIONS FOR RECEIVE

........................................... 47 –54

■ Simple band scope ....................... 47

■ Preamp/Attenuator ....................... 48

■ RIT function .................................. 48

■ AGC function ................................ 49

■ IF ﬁlter selection ........................... 50

■ IF (DSP) ﬁlter shape ..................... 51

■ Noise blanker ............................... 51

■ Meter peak hold function .............. 51

■ Twin PBT operation ...................... 52

■ Noise reduction ............................ 53

■ Notch function .............................. 53

■ Dial lock function .......................... 53

■ Voice squelch control function ...... 54

6 FUNCTIONS FOR TRANSMIT

........................................... 55 –61

■ VOX function ................................ 55

■ Break-in function .......................... 56

■ ∂TX function ................................ 57

■ Monitor function ............................ 57

■ Speech compressor ..................... 58

■ Transmit ﬁlter width selection ....... 58

■ Split frequency operation .............. 59

■ Quick split function ....................... 60

■ Measuring SWR ........................... 61

7 MEMORY OPERATION ........ 62–68

■ Memory channels ......................... 62

■ Memory channel selection ............ 62

■ Programming a memory ............... 63

■ Memory clearing ........................... 63

■ Selecting the call channel ............. 64

■ Programming the call channel ...... 64

■ Frequency transferring ................. 65

■ Programming scan edges ............ 66

■ Assigning memory names ............ 67

■ Memo pads ................................... 68

8 SCANS ................................. 69 –74

■ Scan types .................................... 69

■ Preparation ................................... 69

■ Voice squelch control function ...... 70

■ Scan set mode ............................. 70

■ Programmed scan/Fine programmed

scan .............................................. 71

■ Memory scan operation ................ 72

■ Select memory scan ..................... 72

■ ∂F scan operation and Fine ∂F scan

...................................................... 73

■ Tone scan/DTCS code scan

operation ...................................... 74

9 ANTENNA TUNER OPERATION

............................................ 75–77

■ Antenna connection and selection 75

■ Antenna tuner operation ............... 76

■ Optional external tuner operation . 77

10 DATA COMMUNICATION ..... 78– 80

■ Connections ................................. 78

■ Packet (AFSK) operation .............. 79

■ Adjusting the TNC output level ..... 80

■ Data transmission speed .............. 80

11 SET MODE ............................ 81–89

■ General set mode ......................... 81

■ Tone control set mode .................. 89

12 OPTION INSTALLATION ..... 90–91

■ Opening the transceiver’s case .... 90

■ UT-102

■ CR-338

VOICE SYNTHESIZER UNIT

HIGH STABILITY CRYSTAL UNIT

..................................................... 91

... 90

13 MAINTENANCE .................... 92–94

■ Trouble shooting ........................... 92

■ Fuse replacement ......................... 93

■ Tuning dial brake adjustment ....... 93

■ Resetting the CPU ........................ 94

■ Frequency calibration (approximate)

..................................................... 94

14 CONTROL COMMAND ......... 95–99

■ Remote jack (CI-V) information .... 95

15 SPECIFICATIONS...................... 100

16 OPTIONS.................................... 101

SUPPLIED ACCESSORIES

The transceiver comes with the following accessories.

q DC power cable (OPC-025D) ............................ 1

w Hand microphone (HM-36) ................................ 1

e Spare fuses (FGB 30 A) .................................... 2

r Spare fuse (FGB 5 A) ........................................ 1

t CW keyer plug (AP-330) .................................... 1

Icom, Icom Inc. and the logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries.

Qty.

QUICK REFERENCE GUIDE

30 A fuses

AC cable

Transceiver

outlet

A DC power

supply*

*13.8 V; at least 23 A

continuous

Black

Red

to DC power socket

Supplied DC power cable

PS-125

DC power socket

Transceiver

DC power cable

Connect to an AC outlet using the supplied AC cable.

■ Installation

1. Install a ground system for DC noise suppression and RFI suppression

2. Install your DC power supply

3. Install lightning protection. This will help protect more than your gear.

1. Grounding your Shack

Although your radio will operate by connecting the DC power supply and antenna, it is necessary to have a good ground system in your shack. A ground connection is the electrical contact between the common point of an electrical or electronic system and the earth.

A good earth ground is necessary to prevent electrical shock, eliminate problems from RFI and DC noise. With more electronic devices being used today, it is also important to reduce RFI and EMI. Although you may not see interference in your shack, without a grounding system, your neighbors may experience interference. Even though many of these devices are Part 15, where they must accept interference from their surrounding environment, it is best to eliminate as much of the possible interference from your shack.

If you do not have a grounding system for your shack, depending on the location of your shack, basement or ground ﬂoor, a good ground system can be as simple as a couple of ground rods driven 6 to 8 feet into the soil. When installing your IC-746PRO to your grounding system, the shortest most direct connection is recommended.

NOTE: There are many publications covering proper grounding techniques. Check with your local dealer for more information and recommendations.

4. Install and connect an antenna system for the appropriate bands of operation

5. Connect other peripheral equipment. This includes microphones, headsets, TNC, amplifiers and any other equipment necessary to make your shack complete.

R WARNING!: NEVER ground station equip-

ment or antennas to house gas lines. NEVER at- tach ground lines to plastic (pvc) pipe.

Some Symptoms if inadequate grounding

a. Poor DC Ground

60 Hz hum on the audio either Rx or Tx without the antenna connected.

If you feel a tingling sensation when you touch a metal surface. Surfaces such as the cover of your radio or power supply.

b. Poor RF Ground

While transmitting and you feel a tingling sensation when you touch a metal surface. Surfaces such as the cover of your radio or power supply.

While transmitting, you experience interference to other electronic devices, such as the telephone, television or stereo audio systems.

2. Installing your DC Power Supply

The DC power supply is a device used to convert 110/220 V AC, also know as Household current, to a steady source of 13.8 V DC.

The perfect match to your IC-746PRO is the PS-125. This compact switching power supply is the matching power supply for your IC-746PRO with a current rating of 25 A continuous duty. This plug and play unit plugs into the DC jack located on the rear of the radio.

• If you are not using the PS-125:

Connect the supplied DC power cable (OPC-025D) to the appropriate color coded terminals, then insert the DC connector into the DC jack located on the rear of the radio.

NOTE: Although the power supply current requirement is quite low during receiving, this not the case when you transmit. With many electrical devices in the shack, it is very important to verify the electrical circuit is not overloaded.

3. Installing lightning protection

30 mm

10 mm (soft solder)

10 mm

1–2 mm

solder solder

Soft solder

Coupling ring

Slide the coupling ring down. Strip the cable jacket and soft solder.

Slide the connector body on and solder it.

Screw the coupling ring onto the connector body.

Strip the cable as shown at left. Soft solder the center conductor.

ANTENNA 1, 2

[Example]: ANT1 for 1.8–18 MHz bands

ANT2 for 21–50 MHz bands

144 MHz ANTENNA

Connect a VHF (60–144 MHz) antenna; impedance: 50 Ω.

Although you may not live in an area with high occurrence for lightning storms, it is always wise to take precautions for lightning or static discharges. Proper lightning protection not only offers protection to the ham gear, but the shack and most importantly the operator.

4. Installing your antenna system

Whether your IC-746PRO is your ﬁrst radio or one of many, one of your key elements in a great shack is the antenna system. There are three connections on the back of your IC-746PRO, two for HF and 6 m and one for 2 m. If you are using one antenna for HF and 6 m, for simplicity, connect the antenna coax to ANT1.

QUICK REFERENCE GUIDE

NOTE: There are many publications covering proper lightning protection, check with your local dealer for more information and recommendations.

Antenna SWR

Each antenna is tuned for a specified frequency range and SWR may be increased out-of-range. When the SWR is higher than approx. 2.0:1, the transceiver’s power drops to protect the ﬁnal transistors. In this case, an antenna tuner is useful to match the transceiver and antenna. Low SWR allows full power for transmitting even when using the antenna tuner. The IC-746PRO has an SWR meter to monitor the antenna SWR continuously.

Your IC-746PRO is equipped with an internal antenna tuner (ATU) for operation on 160–6 m. This ATU is designed to work with an unbalanced 50 Ω feedline. The purpose of the internal antenna tuner is to match the impedance of your antenna system to as close to a 50 Ω load as possible. This ATU will not operate with a long wire or ladder line (450 Ω or other balanced feedlines). An external ATU such as the AH-4 would be necessary for this kind of operation.

PL-259 CONNECTOR INSTALLATION EXAMPLE

30 mm ≈9⁄8 in 10 mm ≈3⁄8 in 1–2 mm ≈1⁄16 in

R WARNING: Although a mag mount antenna works great on a vehicle, DO NOT use the IC746PRO with this type of antenna.

CAUTION: Although your IC-746PRO has protection to drop down power with a high SWR, this does not completely protect the transceiver from transmission without an antenna. Make sure you have an antenna connected whenever you transmit with your radio.

NOTE: There are many publications covering proper antennas and their installation, check with your local dealer for more information and recommendations.

QUICK REFERENCE GUIDE

MICROPHONES

HM-36 SM-20

STRAIGHT KEY

(+)

(_)

CW KEY

A straight key can be used when the internal electronic keyer is turned OFF in keyer set mode. (p. 34)

(dot) (com) (dash)

5. Connect other peripheral equipment

Everyone has his or her favorite ad-on gear; now is the time to connect this gear! We will cover the basic devices that can be connected to your IC-746PRO.

■ Operation

1. Voice

Microphones: Connect the microphone to the eightpin connector on the front of the radio.

If you do not see the particular item you are wanting to connect, refer to the Advance Connections section starting on page 15.

2. CW

CW Key: There are several types of keys or keyers that can be used with your IC-746PRO.

a. Iambic Key paddle: Use a 6.35(d) mm (1⁄4″) stereo

plug and connect to the [ELEC-KEY] jack located on the front of the radio.

III

b. Straight Key: Use a 6.35(d) mm (1⁄4″) mono plug

and connect key to the back of the radio.

c. External Keyer: Use a 6.35(d) mm (1⁄4″ ) mono

plug and connect to the back of the radio.

d. Computer Keying: Use a 6.35(d) mm (

⁄4″) mono

plug and connect to the back of the radio.

NOTE: You will need to select the type of keyer you are using in the Keyer Set mode. There are many advanced CW functions in this set mode. Until you have a full understanding of these functions change only the items necessary.

3. Other convenient items

EXTERNAL SPEAKER

SP-21 (optional)

HEADPHONES

[POWER] [F-INP] [M-CL]

Headphones:

A 6.35(d) mm (1⁄4″) mono jack for operation without using the internal or external speakers. Perfect for operation without disturbing others in the room.

QUICK REFERENCE GUIDE

External Speaker:

A 3.5(d) mm (1⁄8″) mono jack for operation with an ex- ternal speaker. (Input impedance: 8 Ω/Max. input power: 5 W)

■ Your ﬁrst contact

Now you should have your IC-746PRO installed in your shack, and like a kid on his birthday, you are probably excited to get on the air. We would like to take you through a few basic operation steps to make your ﬁrst “On The Air” an enjoyable experience.

Getting started

1. Before powering up your radio, you may want to make sure the following controls are set in the following positions:

•[AF] : Commonly referred to as the vol- ume: fully counter clockwise.

•[NR] : The noise reduction control: fully counter clockwise.

•[MIC GAIN] : The mic gain: fully counter clock- wise.

•[RF/SQL] : The control for the RF Gain and Squelch circuits: 12 o’clock.

•[CW PITCH] : The control for the CW pitch: 12 o’clock.

•[KEY SPEED] : Internal CW Keyer Speed: fully

•[NOTCH] : Control for the manual notch:

counter clockwise

12 o’clock

2. Resetting the CPU: Although you have purchased a brand new radio, some settings may be changed from the factory defaults during the QC process. So your radio can start from Factory Defaults resetting the CPU is necessary.

QUICK REFERENCE GUIDE

GENE

3.5

1. 8

144

ENT

Either “1” or “2” appears.

*No indicator appears during 144 MHz operation.

AF RF/SQL

No audio output

Max. audio output

Decreases Increases

Just listening

1. Select the desired band

On your IC-746PRO, an easy way of changing bands is by using the keypad located just above the tuning knob on the right hand side of the display. You will notice each switch has two sets of numbers; one set of numbers represents the band selection.

2. Tune to the desired frequency

Directly below the keypad is the tuning knob. This will allow you to dial in the frequency you want to operate. You will notice the tuning speed [TS] is 10 Hz resolution. Page 22 will instruct you on how to set the tuning speed [TS] for 1 Hz resolution.

•Say you want to go to 20 meters or 14 MHz; you would push the [145]. This will immediately change the displayed operating frequency to the 20-meter band. By pushing [145] again, frequency pre-sets in the triple band stacking registers frequency can be displayed. For more details on this system refer to p. 19.

NOTE: Although you can directly enter the frequency with the keypad, using the Band Stacking Register and the tuning knob is the most popular method of hoping around the bands. For more information regarding the direct frequency entry method, refer to p. 22.

3. Verify proper antenna has been selected.

You IC-746PRO has three antenna connectors. Two for HF and 6 m and a one for 2 m. The selection for 2 m is automatic, where the HF and 6 m is user selectable for either one of the antenna jacks. For ﬁrst time use, the antenna selector should show “” on the display of your radio. Verify the antenna selected on the display is the antenna port your antenna is connected to.

4. Adjust audio output

Adjust this control to a comfortable audio level.

AGC DUP CMP TBW SCP

[NR] [NR]

Appears

What are you hearing?

Stop and focus on what you are hearing. Do you hear a lot of noise? Is the signal intelligible? Are you set up for the right mode? How about the ﬁlters?

1. Verify mode

QUICK REFERENCE GUIDE

Although your IC-746PRO will automatically select USB or LSB in the HF bands, it will not select any of the other modes. You will need to select the proper mode whether CW, RTTY, AM or FM.

2. Reducing interference

Your IC-746PRO has many features to reduce QRM and QRN from the desired signal.

a. Noise Reduction: The noise reduction system on

your IC-746PRO is part of the 32-bit DSP. This is used to reduce the hiss and QRM levels. To activate, push the [NR] switch located just to the right of the [PHONES] jack.

SSB

CW/RTTY

AM/FM

Hint!

The Triple Band Stacking Register will memorize the last three frequencies used in the band, as well as the Mode, Filter, Tuner and AGC settings. This makes band hoping much easier.

NR NOTCH

Decreases

OFF

Noise reduction ON

Increases

b. Adjusting the Noise Reduction: The noise re-

duction is completely variable on how much of the DSP Noise Reduction is used [NR] level control located just above the [NR] switch.

Noise reduction OFF

Hint!

How far you advance the NR control will determine how much the noise can be effectively reduced. Turning the control too far clockwise may cause some distortion to occur on the received signal. The NR control should only be turned as far clockwise as is necessary. Use this control, along with RF gain, NB (noise blanker, if needed), and IF ﬁlters as well, to minimize the effects of noise on the target signal.

QUICK REFERENCE GUIDE

AGC DUP CMP TBW SCP

[A/NOTCH] [NOTCH]

Notch function indicators

NR NOTCH

Low frequency High frequency

• Filter set mode indication

Shows the selected filter and passband width.

• Indication while setting

While pushing [F1 BW], rotate the tuning dial to set passband width.

Reverses Appears

AGC DUP CMP TBW SCP

[FILTER]

The selected filter width is indicated for approx. 1 sec. when [FILTER] is pushed.

Filter selection

c. Notch: There are two notch systems on your IC-

746PRO.

•Automatic: The automatic notch will track up to three heterodynes. This is helpful for eliminating annoying transmitter “tune up” tones on any band, and to minimize continuous tone “heterodynes” encountered on the 40 meter phone bands at night, for example. Once selected an icon will appear “A NOTCH” on the display.

Hint!

The Automatic Notch will not operate in the SSB data, CW or RTTY modes.

•Manual: The Manual notch provides 70 dB of atten- uation to pin point an interfering signal. The 12 o’- clock position is on the operating frequency, turning the Notch knob clockwise moves the notch up the band and counter clockwise will move the notch down the band. Once selected an icon “NOTCH” will appear on the display.

NOTE: Your IC-746PRO is equipped with multiple AGC circuits. This allows the DSP to ﬁlter out interfering signals and QRM, while also taking this interference out of the AGC. Bottom line, this will either eliminate or greatly reduce the pumping of the AGC from the interfering signal.

d. Filters: Your IC-746PRO has an incredible IF DSP

based ﬁlter network with over 100 settings.

•Dial in your filters: By pushing [FILTER] for 1 sec., you enter the ﬁlter set mode. This is where you are able set the three ﬁlter presets. Across the bottom of the display you will see the “BW” icon. The switch directly below, along with the tuning dial, will be used to select the changes you will make.

VII

QUICK REFERENCE GUIDE

• Filter set mode indication

Shows the selected filter and passband width.

• Indication while PBT setting

Appears when passband is shifted.

*By pushing [PBTC] for 1 sec., the shifted value returns to the default setting, and the “dot” disappears.

AGC DUP CMP TBW SCP

Passband width and shifting value are indicated while [TWIN PBT] is operated.

[TWIN PBT] control

[PBTC]

Appears when PBT is used.

One of “1,” “2” or “3” is

displayed for selected filter

number indications.

d. Filters:— continued

•

On the fly adjustment: Once the adjustments have been made in the ﬁlter set mode, you can make on the ﬂy changes by using the Twin Pass Band Tuning, Twin PBT. You will be able to see the effects of the Twin PBT on the upper left hand side of the screen.

NOTE: The Twin PBT filters shift the two IF DSP ﬁlters (See Diagrams below and right). This feature allows both an IF shift as well as a narrowing of the Pass Band. Although you can narrow the pass band by shifting the two ﬁlters, this does not narrow both filters, thus the filter shape is not narrowed. You may hear some signal artifacts pass through this ﬁlter adjustment.

PBT operation example

Center

IF center frequency

interference

Passband

desired signal

pass band

inteference

Passband

desired signal

IF shift

IF center freq.

interference

VIII

QUICK REFERENCE GUIDE

[F1 ≤]

Tuning dial[MENU]

[F2 ≥] [F4 TCN]

RX Bass

SSB

RX Treble

SSB

3. RX Tone Control:

Once you have mastered your ﬁlter settings, one last feature to enable the most intelligible audio is the actual audio tone you hear. You can adjust the equalization of your received audio ±5dB.

q Push [MENU] several times, or until M2 is shown

on the display.

w Push [F4 TCN] for the Tone Control set mode. e Push the appropriate mode switch to adjust SSB,

AM or FM.

r Push [F1 ≤] or [F2 ≥] to change to the desired

component.

1. RX Bass

This item adjusts the bass level of the receive audio tone from –5 dB to +5 dB in 1 dB steps.

2. RX Treble

This item adjusts the treble level of the receive audio tone from –5 dB to +5 dB in 1 dB steps.

We hope these pointers have been helpful. Now you are ready for the “Ready to call CQ?”.

■ Ready to call CQ?

[NR]: Max. CCW [NOTCH]: Max. CCW

i746PRO

TUNER

POWER

TRANSMIT

[TRANSMIT]: OFF

PHONES

ELEC-KEY

[AF]: Max. CCW

MIC

[RF/SQL]: 12 o’clock

[MIC GAIN]: Max. CCW

[RF PWR]: Max. CCW [CW PITCH]: 12 o’clock

ANT

NOTCH

/NOTCH

RF/SQL

F 1

MIC GAIN

RF PWR

CW PITCH

KEY SPEED

HF/VHF TRANSCEIVER

F 2F 3

SSB

CW/RTTY

P.AMP/ATT

3.5

1.8

GENE

MP-W

XFC

F 4

F 5

FILTER

AM/FM

VOX/BK-IN

MONITOR

CALL

[KEY SPEED]: Max. CCW

MP-R

F-INP

SPLIT

A/B

TWIN PBT

PBTC

V/M

M-CL

LOCK/

SPCH

M-CH

RIT

CLEAR

∂TX

RIT/∂TX

LOCK

144

ENT

1. Setting up your transmit audio

The 32-bit DSP in your IC-746PRO is capable of allowing you to selects transmit audio for phone modes.

2. Mic Gain

The microphone gain is used for proper transmit audio level for full output power.

F 1

F 2F 3

F 4

F 5

F 1

F 2 F 3 F 4 F 5

AGC DUP CMP TBW SCP

BW=WIDE

Push [F4]

Push [F4] for 1 sec. to select the transmit filter width.

The selected transmit filter width is displayed for approx. 1 sec.

3. DSP TX Audio Pass Band

TX Bass

SSB

TX Treble

SSB

The capability of changing the pass band of your transmit audio, is at your ﬁnger tips. Regardless of the condition of the speech compressor, you can adjust it by selecting the [F4 TBW].

You will ﬁnd this located in the M1 menu. By pushing [F4 TBW] for 1 sec. you can select the TX audio band pass.

There are three levels of audio passband width available (Wide, Mid, and Nar).

TX Audio Passband widths

Wide : 2.8 kHz ; Great Full Audio Mid :2.4 kHz ; Great for operators with

deep full voices

Nar : 2.2 kHz ; Great for breaking through

pile ups

4. Microphone Equalizer

Although these bandwidths are ﬁxed, the Microphone Tone Control will give you more audio control for your voice operation on SSB, AM, and FM modes. Your IC746PRO is equipped with a very powerful equalizer system with 121 possible combinations. This is achieved by using the separate bass and treble adjustments. The default for both the Base and Treble is at 0 dB.

[F1 ≤]

QUICK REFERENCE GUIDE

[F2 ≥] [F4 TCN]

Entering Microphone Tone Control set mode:

q Push [MENU] several times, or until M2 is shown

on the display.

w Push [F4 TCN] for the Tone Control set mode. e Push the appropriate mode switch to adjust SSB,

AM, or FM.

r Push [F1 ≤] or [F2 ≥] to change to the desired

component.

1. TX Bass

This item adjusts the bass level of the transmit audio tone from –5 dB to +5 dB in 1 dB steps.

2. TX Treble

This item adjusts the treble level of the transmit audio tone from –5 dB to +5 dB in 1 dB steps.

Verify you have selected a clear frequency and call out your CQ!

Tuning dial[MENU]

Hint!

Voice patterns and audio characteristics vary with each operator, therefore the [MIC GAIN], DSP TX Audio Pass Band and Microphone Tone Control settings will be different for each operator. Actual on air experimenting is necessary to get just the right sound. Listen to your transmit audio with headphones and the monitor function turned ON. It’s also best to test and adjust your audio on the air, while someone who knows what your real voice sounds like listens, and provides and opinion on your audio quality.

Recommended level

RF gain adjustable range

Maximum RF gain

S-meter squelch

Noise squelch (FM mode)

Squelch is open.

MODE

SSB, CW

RTTY

AM, FM

AUTO

RF GAIN

SQL

SET MODE SETTING

SQL

RF GAIN + SQL

(dot) (com) (dash)

POWER

TRANSMIT

PHONES

ELEC-KEY

MIC

/NOTCH

TUNER

ANT

HF/VHF TRANSCEIVER

NOTCH

MIC GAIN

RF PWR

CW PITCH

F 1

F 2F 3

F 4

F 5

XFC

MP-W

GENE

3.5

1. 8

144

ENT

MP-R

LOCK

SPLIT

F-INP

A/B

KEY SPEED

P.AMP/ATT

VOX/BK-IN

MONITOR

CALL

LOCK/

SPCH

RF/SQL

i746PRO

SSB

CW/RTTY

AM/FM

FILTER

yuio !0 !1

!4!5!6!7 !3 !2

PANEL DESCRIPTION

■ Front panel

q POWER SWITCH [POWER]

➥ Push momentarily to turn power ON.

• Turn the optional DC power supply ON in advance.

➥ Push for 1 sec. to turn power OFF.

w TRANSMIT SWITCH [TRANSMIT]

Selects transmitting or receiving.

•The [TX] indicator lights red while transmitting and the [RX] indicator lights green when the squelch is open.

e HEADPHONE JACK [PHONES]

Accepts headphones.

• Output power: 5 mW with an 8 Ω load.

•When headphones are connected, the internal speaker

or connected external speaker does not function.

r ELECTRONIC KEYER JACK [ELEC-KEY] (p. 14)

Accepts a paddle to activate the internal electronic keyer for CW operation.

•Selection between the internal electronic keyer, bug-key and straight key operation can be made in keyer set mode. (p. 34)

•A straight key jack is separately available on the rear panel. See [KEY] on p. 7.

•Keyer polarity (dot and dash) can be reversed in keyer set mode. (p. 34)

•4-channel memory keyer is available for your convenience. (p. 30)

t MICROPHONE CONNECTOR [MIC]

Accepts the supplied or an optional microphone.

• See p. 101 for appropriate microphones.

• See p. 12 for microphone connector information.

y RF GAIN CONTROL/SQUELCH CONTROL

[RF/SQL] (outer control)

Adjusts the RF gain and squelch threshold level. The squelch removes noise output from the speaker (closed condition) when no signal is received.

•The squelch is particularly effective for FM. It is also available for other modes.

•12 to 1 o’clock position is recommended for any setting of the [RF/SQL] control.

•The control can be set as ‘Auto’ (RF gain control in SSB, CW and RTTY; squelch control in AM and FM) or squelch control (RF gain is fixed at maximum) in set mode as follows. (p. 82)

• When setting as RF gain/squelch control

PANEL DESCRIPTION

NR NOTCH

OFF

Decreases

Increases

NR NOTCH

Low frequency High frequency

Slow Fast

KEY SPEED

CW PITCH

IncreasesDecreases

RF PWR

IncreasesDecreases

AF RF/SQL

No audio output

Max. audio output

Decreases Increases

MIC GAIN

Recommended level for an Icom microphone

IncreasesDecreases

Squelch is open.

S-meter squelch

S-meter squelch threshold

Noise squelch threshold (FM mode)

Shallow Deep

Noise squelch (FM mode)

Minimum RF gain

Adjustable range

Maximum RF gain

•When functioning as RF gain control

(Squelch is ﬁxed open; SSB, CW, RTTY only)

•When functioning as squelch control

(RF gain is ﬁxed at maximum.)

While rotating the RF gain control, noise may be heard. This comes from the DSP unit and does not indicate an equipment malfunction.

u MIC GAIN CONTROL [MIC GAIN]

Adjusts microphone input gain.

•The transmit audio tone in SSB, AM and FM modes can be adjusted in tone control set mode. (p. 89)

!0 CW PITCH CONTROL [CW PITCH] (p. 28)

Shifts the received CW audio pitch and monitored CW audio pitch without changing the operating frequency.

•The pitch can be changed from 300 to 900 Hz in approx. 25 Hz steps.

!1 ELECTRONIC CW KEYER SPEED CONTROL

[KEY SPEED] (p. 28)

Adjusts the internal electronic CW keyer’s speed.

• 6 wpm (min.) to 60 wpm (max.) can be set.

!2 AUTO NOTCH/MANUAL NOTCH SWITCH

[A/NOTCH] (p. 53)

Toggles the notch function between manual and automatic when pushed.

•“NOTCH” appears when manual; “A NOTCH” appears when automatic notch is selected.

!3 NOTCH CONTROL [NOTCH] (outer control; p. 53)

Adjusts the notch ﬁlter frequency to remove an in- terfering signal.

✔

How to set the microphone gain.

Set the [MIC] control so that the ALC meter sometimes swings during normal voice transmission in SSB mode. Make sure that voice peak readings do not exceed the ALC range brackets on the meter.

i AF CONTROL [AF] (inner control)

Varies the audio output level from the speaker.

o RF POWER CONTROL [RF PWR]

Continuously varies the RF output power from minimum (less than 5 W*) to maximum (100 W*).

* AM mode: less than 5 W to 40 W

!4 ANTENNA SELECTOR SWITCH [ANT] (p. 75)

Switches the antenna connector selection between ANT1 and ANT2 when pushed.

!5 NOISE REDUCTION LEVEL CONTROL [NR]

(inner control; p. 53) Adjusts the noise reduction level when the noise reduction is in use. Set for maximum readability.

ANTENNA TUNER SWITCH [TUNER] (pgs. 76, 77)

➥ Turns the antenna tuner ON and OFF (bypass)

when pushed momentarily.

➥ Starts to tune the antenna manually when

pushed for 1 sec.

•When the tuner cannot tune the antenna, the tuning circuit is bypassed automatically after 20 sec.

!7 NOISE REDUCTION SWITCH [NR] (p. 53)

Switches the noise reduction ON and OFF.

•“NR” appears while the noise reduction is activated.

AM/FM

CW/RTTY

SSB

/NOTCH

TUNER

ANT

HF/VHF TRANSCEIVER

NOTCH

MIC GAIN

RF PWR

CW PITCH

F 1

F 2F 3

F 4

F 5

XFC

MP-W

GENE

3.5

1. 8

144

ENT

MP-R

LOCK

TWIN PBT

M-CH

RIT

CLEAR

∂TX

RIT/∂TX

SPLIT

PBTC

F-INP

A/B

V/M

M-CL

KEY SPEED

P.AMP/ATT

VOX/BK-IN

MONITOR

CALL

LOCK/

SPCH

RF/SQL

i746PRO

SSB

CW/RTTY

AM/FM

FILTER

#7 #6 #5 #4

#3 #2

#1 #0

!9 @0 @1!8 @2 @3 @4

@6@5 @7 @8 @9

PANEL DESCRIPTION

■ Front panel (continued)

!8 MULTI-FUNCTION SWITCHES [F1]–[F5]

!9 MENU SWITCH [MENU]

@0 MODE SWITCHES

➥Push to select the function indicated in the LCD

display above these switches. (p. 11)

•Functions vary depending on the operating mode.

➥Push to input a character for memory keyer pro-

gramming or memory name. (pgs. 31, 67)

Push to change the set of functions assigned to the multi-function switches.

• Toggles between menu 1 (M1) and menu 2 (M2).

Selects the desired mode. (p. 23)

•Announces the selected mode when an optional UT-102 is installed. (p. 90)

➥ Selects USB and LSB mode alternately. ➥ Selects SSB data mode (USB-D, LSB-D)

when pushed for 1 sec. in SSB mode.

➥ Selects CW and RTTY mode alternately. ➥ Switches CW and CW-R (CW reverse)

mode when pushed for 1 sec. in CW mode.

➥ Switches RTTY and RTTY-R (RTTY re-

verse)

mode when pushed for 1 sec. in

RTTY mode.

➥ Selects AM and FM mode alternately. ➥ Selects AM/FM data mode (AM-D, FM-D)

when pushed for 1 sec. in AM/FM mode.

@1 PREAMP/ATTENUATOR SWITCH [P.AMP/ATT]

(p. 48) ➥ Push momentarily to toggle between preamp-1

and preamp-2.

•“P.AMP1” activates for HF all bands.

•“P.AMP2” activates high-gain preamp for 24 MHz

band and above.

➥ Push for 1 sec. to toggle the attenuator function

ON and OFF.

✔

What is the preamp?

The preamp ampliﬁes received signals in the front end circuit to improve the S/N ratio and sensitivity. Select “P.AMP1” or “P.AMP2” when receiving weak signals.

✔

What is the attenuator?

The attenuator prevents a desired signal from distorting when very strong signals are near the desired frequency, or when very strong electric ﬁelds, such as from a broadcasting station, are near your location.

@2 NOISE BLANKER SWITCH [NB] (p. 51)

➥ Switches the noise blanker ON and OFF when

pushed. The noise blanker reduces pulse-type noise such as that generated by automobile ignition systems. This function cannot be used for FM, or non-pulse-type noise.

•“NB” appears while the noise blanker is activated.

➥ Enters the noise blanker level set mode when

pushed for 1 sec.

PANEL DESCRIPTION

Low shift High shift

RIT/∂TX

@3 VOX/BREAK-IN SWITCH [VOX/BK-IN]

➥ In SSB, AM and FM modes, push momentarily to

turn the VOX function ON and OFF (p. 55); push for 1 sec. to enter VOX set mode (p. 55).

➥ In CW mode, push momentarily to turn the semi

break-in, full break-in or break-in OFF (p. 56); push for 1 sec. to enter break-in set mode (p. 56).

✔

What is the VOX function?

The VOX function (voice operated transmission) starts transmission without pushing the transmit switch or PTT switch when you speak into the microphone; then, automatically returns to receive when you stop speaking.

✔

What is the break-in function?

Full break-in (QSK) activates the receiver between transmitted dots and dashes. This is useful when operating in nets, or during DX pileups and during contests, when “fast exchanges” are common.

@4 MONITOR SWITCH [MONITOR] (p. 57)

➥ Monitors your transmitted signal. ➥ Enters monitor set mode when pushed for 1 sec.

@5 FILTER SWITCH [FILTER] (p. 50)

➥ Selects one of 3 IF ﬁlter settings. ➥ Enters the ﬁlter set mode when pushed for 1 sec.

@6 CALL SWITCH [CALL] (p. 64)

Selects the call channel when pushed momentarily.

@7 TUNING DIAL (p. 21)

Changes the displayed frequency, selects set mode items, etc.

#0 RIT SWITCH [RIT] (p. 48)

➥

Turns the RIT function ON and OFF when pushed.

• Use the [RIT/∂TX] control to vary the RIT frequency.

➥ Adds the RIT shift frequency to the operating fre-

quency when pushed for 1 sec.

✔

What is the RIT function?

The RIT (Receiver Incremental Tuning) shifts the receive frequency without shifting the transmit frequency.

This is useful for ﬁne tuning stations calling you on an off-frequency or when you prefer to listen to slightly differentsounding voice characteristics, etc.

#1 CLEAR SWITCH [CLEAR] (pgs. 48, 57)

Clears the RIT/∂TX shift frequency when pushed for 1 sec.

•Can be cleared instantly when [CLEAR] is pushed if the Quick RIT Clear is set to ON (p. 86).

#2∂∂TX SWITCH [∂∂TX] (p. 57)

➥ Turns the ∂TX function ON and OFF when

pushed.

•Use the [RIT/∂TX] control to vary the ∂TX frequency.

➥ Adds the ∂TX shift frequency to the operating

frequency when pushed for 1 sec.

✔

What is the ∂∂TX function?

The ∂TX shifts the transmit frequency without shifting the receive frequency. This is useful for simple split frequency operation in CW, etc.

#3 MEMORY CHANNEL SELECTOR [M-CH] (p. 62)

Select a memory channel.

•Rotate clockwise to increase the memory channel; rotate counterclockwise to decrease the memory channel.

LOCK/SPEECH SWITCH [LOCK/SPCH]

➥ Push momentarily to toggle the dial lock function

ON and OFF. (p. 53)

➥ Pushing for 1 sec. announces the selected read-

out frequency and S-meter indication when an optional UT-102 is installed. (p. 90)

@9 RIT/∂∂TX CONTROL [RIT/∂∂TX] (pgs. 48, 57)

Shifts the receive and/or transmit frequency without changing the transmit and/or receive frequency while the RIT and/or ∂TX functions are ON.

•Rotate the control clockwise to increase the frequency, or rotate the control counterclockwise to decrease the frequency.

• The shift frequency range is ±9.99 kHz in 10 Hz steps.

#4 VFO/MEMORY SWITCH [VFO/MEMO]

➥ Switches the selected readout operating mode

between the VFO mode and memory mode when pushed. (pgs. 20, 62)

➥ Transfers the memory contents to VFO when

pushed for 1 sec. (p. 65)

#5 MEMORY CLEAR SWITCH [M-CL] (p. 63)

Clears the selected readout memory channel contents when pushed for 1 sec. in memory mode.

• The channel becomes a blank channel.

• This switch does not function in VFO mode.

#6 MEMORY WRITE SWITCH [MW] (p. 63)

Stores the selected readout frequency and operating mode into the displayed memory channel when pushed for 1 sec.

•This function is available both in VFO and memory modes.

#7 PBT CLEAR SWITCH [PBTC] (p. 52)

Clears the PBT settings when pushed for 1 sec.

Quick tuning indicator

/NOTCH

NER

ANT

HF/VHF TRANSCEIVER

NOTCH

MIC GAIN

RF PWR

CW PITCH

F 1

F 2F 3

F 4

F 5

XFC

MP-W

GENE

3.5

1. 8

144

ENT

MP-R

LOCK

TWIN PBT

M-CH

RIT

CLEAR

∂TX

RIT/∂TX

SPLIT

PBTC

F-INP

A/B

V/M

M-CL

KEY SPEED

P.AMP/ATT

VOX/BK-IN

MONITOR

CALL

LOCK/

SPCH

RF/SQL

SSB

CW/RTTY

AM/FM

FILTER

$3 $2 $1 $0 #9 #8

%0 $9 $8%1

PANEL DESCRIPTION

■ Front panel (continued)

#8 TRANSMIT FREQUENCY CHECK SWITCH [XFC]

(pgs. 45, 48) Monitors the transmit frequency when pushed and held.

•While pushing this switch, the transmit frequency can be changed with the tuning dial, keypad or memo pad.

•When the split lock function is turned ON, pushing [XFC] cancels the dial lock function. (p. 60)

#9 MEMO PAD-WRITE SWITCH [MP-W] (p. 68)

Programs the selected readout frequency and operating mode into a memo pad.

•The 5 most recent entries remain in memo pads.

•The transmit frequency is programmed when pushed to-

gether with [XFC].

•The memo pad capacity can be expanded from 5 to 10 in set mode for your convenience. (p. 85)

$0 TRANSMIT INDICATOR [TX]

Lights red while transmitting.

$1 MEMO PAD-READ SWITCH [MP-R] (p. 68)

Each push calls up a frequency and operating mode in a memo pad. The 5 (or 10) most recently programmed frequencies and operating modes can be recalled, starting from the most recent.

•The memo pad capacity can be expanded from 5 to 10 in set mode for your convenience. (p. 85)

$2 RECEIVE INDICATOR [RX]

Lights green while receiving a signal and when the squelch is open.

$3 LOCK INDICATOR [LOCK] (p. 53)

Lights when the dial lock function is activated.

$4 QUICK TUNING SWITCH [TS] (p. 21)

➥ Turns the quick tuning step ON and OFF.

•While the quick tuning indicator is displayed, the frequency can be changed in programmed kHz steps.

•0.1, 1, 5, 9, 10, 12.5, 20 and 25 kHz quick tuning steps are available.

➥ While the quick tuning step is OFF, turns the 1 Hz

step ON and OFF when pushed for 1 sec.

•1 Hz indication appears, and the frequency can be changed in 1 Hz steps.

➥ While the quick tuning step is ON, enters the

quick tuning step set mode when pushed for 1 sec.

$5 VFO SELECT SWITCH [A/B] (p. 20)

➥ Push to toggle between VFO A and VFO B. ➥ Push for 1 sec. to equalize the frequency and op-

erating mode of the two VFO’s.

PANEL DESCRIPTION

PBT1

PBT2

TWIN PBT

Low cut High cutCenter

TWIN PBT TWIN PBT TWIN PBT

– +

$6 SPLIT SWITCH [SPLIT]

➥ Turns the split function ON and OFF when

pushed.(p. 59)

➥ Turns the quick split function ON, when pushed

for 1 sec. (p. 60)

•The offset frequency is shifted from the displayed frequency.

•The quick split function can be turned OFF using set mode. (p. 83)

➥ Turns the split function ON and sets the transmit

frequency after inputting an offset frequency with the keypad (±4 MHz in 1 kHz steps; p. 59).

$7 PASSBAND TUNING CONTROLS [TWIN PBT]

Adjust the receiver’s “passband width” of the DSP ﬁlter. (p. 52)

•Passband width and shift frequency are displayed in the

multi-function switch indicator.

•Push [PBTC] for 1 sec. to clear the settings when not in use.

•Variable range is set to half of the IF filter passband width. 25 Hz steps and 50 Hz steps are available.

•These controls function as an IF shift control while in AM mode and when the RTTY ﬁlter is turned ON. Only the inner control may function in this case.

✔

What is the PBT control?

General PBT function electronically narrows the IF passband width to reject interference. This transceiver uses the DSP circuit for the PBT function.

%1 KEYPAD

➥ Pushing a key selects the operating band.

•[GENE • ] selects the general coverage band.

➥ Pushing the same key 2 or 3 times calls up other

stacked frequencies and modes in the band. (p. 19)

•Icom’s triple band stacking register memorizes 3 frequencies in each band.

➥ After pushing [F-INP], enter a keyed frequency.

Pushing [144 ENT] is necessary at the end. (p. 22)

•e.g. to enter 14.195 MHz, push [F-INP] [1.81] [104] [GENE • ] [1.8

] [289] [145] [144 ENT].

%2 LCD FUNCTION DISPLAY

(See pgs. 9, 10 for details.) Shows the operating frequency, function switch menus, band scope screen, memory name screen, set mode settings, etc.

$8 SPLIT INDICATOR (p. 59)

Lights during split operation.

$9 FREQUENCY INPUT SWITCH [F-INP] (p. 22)

Push to toggle keypad input between frequency and band.

• The frequency input indicator lights when frequency input is selected for the keypad.

%0 FREQUENCY INPUT INDICATOR (p. 22)

Lights when frequency input from the keypad is enabled.

!5 !3 t

!2 !1 !0 oi uy

qwe

(+)

(_)

Rear panel view

PANEL DESCRIPTION

■ Rear panel

q DC POWER SOCKET [DC 13.8V] (pgs. 14, 16)

Accepts 13.8 V DC through the supplied DC power cable (OPC-025D).

w ANTENNA CONNECTOR [ANT 144MHz] e ANTENNA CONNECTOR 2 [ANT2] r ANTENNA CONNECTOR 1 [ANT1]

(pgs. 14, 15, 17, 75) Accepts a 50 Ω antenna with a PL-259 connector.

•[ANT 144MHz] for 144 MHz (2 m) band only; [ANT1] and [ANT2] for both HF and 50 MHz (6 m) bands antennas.

When using an optional AH-4 HF/50 MHz AUTO-

MATIC ANTENNA TUNER

, connect it to the [ANT1] connector. The internal antenna tuner activates for [ANT2] and deactivates for [ANT1] when connecting the AH-4.

t DATA SOCKET [DATA] (pgs. 15, 78)

Connects a TNC (Terminal Node Controller), etc. for data communications.

• See p. 8 for connector information.

EXTERNAL SPEAKER JACK [EXT SP] (pgs. 15, 101) Accepts a 4–8 Ω speaker.

CI-V REMOTE CONTROL JACK [REMOTE] (p. 95)

➥ Designed for use with a personal computer for re-

mote control of the transceiver functions.

➥ Used for transceive operation with another Icom

CI-V transceiver or receiver.

i SEND CONTROL JACK [SEND] (p. 17)

Goes to ground while transmitting to control external equipment such as a linear ampliﬁer.

• Max. control level: 16 V DC/0.5 A

CAUTION: Be sure the linear ampliﬁers keying cir-

cuit control voltage is compatible to the IC-746PRO,

before connecting to [SEND].

o ALC INPUT JACK [ALC] (p. 17)

Connects to the ALC output jack of a non-Icom linear ampliﬁer.

!0 ACCESSORY SOCKET 2 [ACC(2)] !1 ACCESSORY SOCKET 1 [ACC(1)]

Enables connection of external equipment such as a linear amplifier, an automatic antenna selector/ tuner, TNC for data communications, etc.

• See p. 8 for socket information.

!2 STRAIGHT KEY JACK [KEY] (p. 14)

Accepts a straight key or external electronic keyer with 1⁄4 inch standard plug.

•[ELEC-KEY] on the front panel can be used for a straight key or external electronic keyer. Deactivate the internal electronic keyer in keyer set mode. (p. 34)

!3 TUNER CONTROL SOCKET [TUNER]

(pgs. 15, 77) Accepts the control cable from an optional AH-4

HF/50 MHz AUTOMATIC ANTENNA TUNER.

If you use an external electronic keyer, make sure the voltage retained by the keyer is less than 0.4 V when the key is ON.

!4 CALIBRATION POT [CAL] (p. 94)

This is used for frequency calibration.

•The transceiver has been adjusted and calibrated thoroughly at the factory. Under normal circumstances, the frequency does not need to be re-calibrated.

!5 GROUND TERMINAL [GND] (pgs. 13, 14)

Connect this terminal to a ground to prevent electrical shocks, TVI, BCI and other problems.

D DATA SOCKET

PANEL DESCRIPTION

DATA

PIN No.

1 DATA IN Input terminal for data transmit. (1200 bps: AFSK/9600 bps: G3RUH, GMSK)

2 GND Common ground for DATA IN, DATA OUT and AF OUT.

3 PTT P PTT terminal for packet operation. Connect ground to transmit data.

Rear panel view

4 DATA OUT Data out terminal for 9600 bps operation only.

5 AF OUT Data out terminal for 1200 bps operation only.

6 P SQL •To avoid unnecessary TNC transmission, connect squelch to the TNC to inhibit trans-

D ACC SOCKETS

ACC (1)

Rear panel view

PIN No.

1 RTTY Controls RTTY keying “Low” level : Less than 0.6 V

2 GND Connects to ground. Connected in parallel with ACC(2) pin 2.

4 MOD

5 AF Fixed, regardless of [AF] position in

NAME DESCRIPTION

Squelch out terminal. Becomes high (+8 V) when the transceiver receives a signal which opens the squelch.

mission when receiving signals.

• Keep audio output at a normal level, otherwise a “P SQL”signal will not be output.

NAME DESCRIPTION SPECIFICATIONS

“High” level : More than 2.4 V

Output current : Less than 2 mA

Ground level : –0.5 V to 0.8 V Output current : Less than 20 mA Input current (Tx) : Less than 200 mA Connected in parallel with ACC(2) pin 3.

HSEND

Input/output pin.

(HF/50 MHz only)

Goes to ground when transmitting. When grounded, transmits.

Modulator input. Input impedance : 10 kΩ Connects to a modulator. Input level : Approx. 100 mV rms

AF detector output.

default settings. (see notes below)

Output impedance : 4.7 kΩ Output level : 100–300 mV rms

ACC (2)

Rear panel view

6 SQLS

7 13.8 V 13.8 V output when power is ON.

Squelch output. SQL open : Less than 0.3 V/5 mA Goes to ground when squelch opens.

SQL closed : More than 6.0 V/100 µA

Output current : Max. 1 A Connected in parallel with ACC(2) pin 7.

Control voltage : –4 V to 0 V

8 ALC ALC voltage input. Input impedance : More than 10 kΩ

Connected in parallel with ACC(2) pin 5.

PIN No.

NAME DESCRIPTION SPECIFICATIONS

1 8 V Regulated 8 V output.

Output voltage : 8 V ±0.3 V Output current : Less than 10 mA

2 GND Same as ACC(1) pin 2.

HSEND

4 BAND

Band voltage output. (Varies with amateur band)

Same as ACC(1) pin 3.

Output voltage : 0 to 8.0 V

5 ALC Same as ACC (1) pin 8.

Input/output pin (144 MHz only) Ground level : –0.5 V to +0.8 V

VSEND

Goes to ground when transmitting. Output current : Less than 20 mA When grounded, transmits. Input current (Tx) : Less than 200 mA

13.8 V

Same as ACC(1) pin 7.

i u

!1!2!3!4

e r

PANEL DESCRIPTION

■ LCD display

q FREQUENCY READOUTS

Shows the operating frequency.

w MULTI-FUNCTION METER INDICATION

➥ Shows receiving signal strength, etc. during re-

ceive.

➥ Shows transmit output power, ALC and SWR dur-

ing transmit.

e VOX INDICATOR (p. 55)

Appears when the VOX function is activated.

MICROPHONE COMPRESSOR INDICATOR (p. 58) Appears when the microphone compressor is activated.

t MULTI-FUNCTION SWITCH INDICATOR (p. 11)

Indicates the functions assigned to the multi-function switches ([F1]–[F5]).

y DSP FILTER INDICATOR (p. 50)

Shows the selected IF ﬁlter.

u MEMORY CHANNEL READOUTS (p. 62)

Shows the selected memory channel.

i SELECT MEMORY CHANNEL INDICATOR (p. 72)

Appears when the selected memory channel is set as a select memory channel.

o BLANK MEMORY INDICATOR (p. 62)

Appears when the selected memory channel is blank.

!01⁄4 TUNING DIAL SPEED INDICATOR (p. 21)

Appears when the tuning dial speed is set so that one rotation is equal to 1⁄4 of the normal rotation.

!1 VOICE SQUELCH CONTROL INDICATOR (p. 54)

Appears during VSC (Voice Squelch Control) function is activated.

!2 MODE INDICATORS (p. 23)

Shows the selected operating mode.

•“D” appears when SSB data, AM data or FM data mode is selected.

!3 ANTENNA INDICATOR (p. 75)

Indicates which antenna connector is used for HF/50 MHz.

!4 ANTENNA TUNER INDICATORS (pgs. 76, 77)

➥ “TUNE” appears when the antenna tuner is ON;

“TUNE” appears and ﬂashes during tuning.

➥ “EXT” appears when the optional AH-4 external

antenna tuner is connected to [ANT1].

■ LCD display (continued)

!7 !8 !9 @0

@7 @6

@5 @4

!5 !6

PANEL DESCRIPTION

!5 BREAK-IN INDICATORS (p. 56)

➥ “FBK-IN” appears when the full break-in function

is activated.

➥ “BK-IN” appears when the semi break-in function

is activated.

!6 MONITOR INDICATOR (p. 57)

Appears when the monitor function is activated.

!7 PREAMP INDICATORS (p. 48)

Appears when the preamp is activated.

!8 ATTENUATOR INDICATOR (p. 48)

Appears when the attenuator is activated.

!9 AGC INDICATORS (p. 49)

Shows the selected AGC time constant.

•“F” for AGC fast; “M” for AGC middle; “S” for AGC

slow; “-OFF” for AGC OFF.

@0 NOISE BLANKER INDICATOR (p. 51)

Appears when the noise blanker is activated.

@1 DTCS INDICATOR (p. 43)

Appears during DTCS operation.

@2 TONE SQUELCH INDICATORS

➥ “T” appears when the repeater tone is activated.

(p. 44)

➥ “TSQL” appears during tone squelch operation.

(p. 42)

@3 DUPLEX INDICATOR (p. 44)

“DUP–” or “DUP+” appears during repeater operation.

@4 NOISE REDUCTION INDICATOR (p. 53)

Appears when the noise reduction is activated.

@5 NOTCH INDICATORS (p. 53)

➥ “NOTCH” appears when the manual notch func-

tion is activated.

➥ “ANOTCH” appears when the automatic notch

function is activated.

@6 SPLIT INDICATOR (pgs. 59, 60)

Appears during split operation.

@7 MEMORY INDICATOR (p. 62)

Appears during memory mode.

@8 VFO INDICATORS (p. 20)

Indicates whether VFO A or VFO B is selected.

@9 RIT/∂∂TX INDICATORS (pgs. 48, 57)

Appears during RIT or ∂TX operation and indicates the frequency offset.

F 5

VSC

F 4

TCN

F 3

SWR

F 2

MEM

F 1

SCN

F 1

F 2F 3

F 4

F 5

SCN MEM SWR TCN VSC

PANEL DESCRIPTION

■ Multi function switches

M1 FUNCTIONS

During SSB operation

AGC DUP CMP TBW SCP

F 1

F 2F 3

F 4

⁄4 TUNING FUNCTION (p. 21)

1/4

F 3

F 5

Push to turn the 1⁄4 tuning function ON/OFF.

•“ ” indicator appears when the 1⁄ function is ON.

4 tuning

During SSB data operation

AGC DUP 1/4 SCP

F 1

F 2F 3

F 4

During CW operation

AGC DUP 1/4 KEY SCP

F 1

F 2F 3

F 4

During RTTY operation

AGC DUP 1/4 RTY SCP

F 1

F 2F 3

F 4

During AM operation

AGC DUP CMP SCP

F 1

F 2F 3

F 4

During FM operation

AGC DUP CMP TON SCP

F 1

F 2F 3

F 4

TRANSMISSION BANDWIDTH (p. 58)

TBW

F 5

F 4

Push to select the transmission bandwidth.

•Bandwidth is selectable from narrow, middle and wide.

MEMORY KEYER MENU (p. 29)

KEY

F 4

F 5

Push to select the memory keyer or keyer send menu, depending on the KEYER 1st Menu setting in the set mode (p. 86).

RTTY MENU (p. 36)

RTY

F 4

F 5

Push to select the RTTY menu.

BAND SCOPE FUNCTION (p. 47)

SCP

F 5

M2 FUNCTIONS

F 5

Push to select the band scope screen.

AGC (p. 49)

AGC

➥ Push momentarily to change the time

F 1

constant of the AGC circuit.

➥ Push for 1 sec. to enter to the AGC set

mode.

DUPLEX (p. 44)

DUP

➥ Push momentarily to select the duplex di-

F 2

rection or turn the function OFF.

•“DUP–” or “DUP+” indicator appears during duplex operation.

➥ Push for 1 sec. to turn the one-touch re-

peater function ON/OFF.

SPEECH COMPRESSOR (p. 58)

CMP

➥ Push momentarily to turn the speech

F 3

compressor function ON/OFF.

•“COMP” indicator appears when the speech compressor is ON.

➥ Push for 1 sec. to enter to the compres-

sor set mode.

SCAN MENU (p. 70)

Push to select the scan menu.

MEMORY NAME MENU (p. 67)

Push to select the memory name screen.

SWR GRAPH FUNCTION (p. 61)

Push to indicate the SWR graph screen.

TONE CONTROL SET MODE (p. 89)

Push to enter the audio tone set mode.

VSC FUNCTION (p. 54)

Push to turn the VSC (Voice Squelch Control) function ON and OFF.

■ Microphone (HM-36)

y GND (PTT ground)

t PTT

r Main readout squelch switch

q Microphone input

w +8 V DC output

e Frequency up/down

u GND

(Microphone ground)

i Main readout AF output

(varies with [AF]/[BAL])

PANEL DESCRIPTION

q UP/DOWN SWITCHES [UP]/[DN]

Change the selected readout frequency or memory channel.

•Continuous pushing changes the frequency or memory channel number continuously.

•While pushing [XFC], the transmit readout frequency can be controlled while in spilt frequency operation.

•The [UP]/[DN] switch can simulate a key paddle. Preset in the keyer set mode. (p. 34)

•MICROPHONE CONNECTOR

(Front panel view)

w PTT SWITCH

Push and hold to transmit; release to receive.

[MIC]

Pin No.

w +8 V DC output Max. 10 mA

FUNCTION DESCRIPTION

Frequency up Ground

Frequency down Ground through 470 Ω

Squelch open “Low” level

Squelch closed “High” level

CAUTION: DO NOT short pin 2 to ground as this

can damage the internal 8 V regulator. NOTE: DC voltage is applied to pin 1 for microphone operation. Take care when using a non-Icom microphone.

• HM-36 SCHEMATIC DIAGRAM

MIC ELEMENT

PTT

MICROPHONE

10µ

RECEIVE

TRANSMIT

4700p

0.33µ

4700p

DOWN UP

470

MICROPHONE CABLE MICROPHONE PLUG

ert

INSTALLATION AND CONNECTIONS

■ Unpacking

After unpacking, immediately report any damage to the delivering carrier or dealer. Keep the shipping cartons.

For a description and a diagram of accessory equipment included with the IC-746PRO, see ‘Supplied accessories’ on p. ii of this manual.

■ Selecting a location

Select a location for the transceiver that allows adequate air circulation, free from extreme heat, cold, or vibrations, and away from TV sets, TV antenna elements, radios and other electromagnetic sources.

The base of the transceiver has an adjustable stand for desktop use. Set the stand to one of two angles depending on your operating conditions.

■ Antenna connection

For radio communications, the antenna is of critical importance, along with output power and sensitivity. Select antenna(s), such as a well-matched 50 Ω antenna, and feedline. 1.5:1 or better of Voltage Standing Wave Ratio (VSWR) is recommended for your desired band. Of course, the transmission line should be a coaxial cable.

When using 1 antenna, use the [ANT1] connector.

CAUTION: Protect your transceiver from lightning

by using a lightning arrestor.

PL-259 CONNECTOR INSTALLATION EXAMPLE

Coupling ring

30 mm

10 mm (soft solder)

10 mm

Soft solder

1–2 mm

solder solder

Slide the coupling ring down. Strip the cable jacket and soft solder.

Strip the cable as shown at left. Soft solder the center conductor.

Slide the connector body on and solder it.

■ Grounding

To prevent electrical shock, television interference (TVI), broadcast interference (BCI) and other problems, ground the transceiver through the GROUND terminal on the rear panel.

For best results, connect a heavy gauge wire or strap to a long earth-sunk copper rod. Make the distance between the [GND] terminal and ground as short as possible.

R WARNING: NEVER connect the [GND]

terminal to a gas or electric pipe, since the connection could cause an explosion or electric shock.

30 mm ≈9⁄8

in 10 mm ≈

Screw the coupling ring onto the connector body.

⁄8

in 1–2 mm ≈

⁄16

Antenna SWR

Each antenna is tuned for a specified frequency range and SWR may be increased out-of-range. When the SWR is higher than approx. 2.0:1, the transceiver’s power drops to protect the ﬁnal transistor. In this case, an antenna tuner is useful to match the transceiver and antenna. Low SWR allows full power for transmitting even when using the antenna tuner. The IC-746PRO has an SWR meter to monitor the antenna SWR continuously.

■ Required connections

i746PRO

POWER

F 1

MENU SSB

F 2

CW/RTTY

F 3

AM/FM

F 4

FILTER

F 5

XFC

MP-W

GENE

MP-R

21724828

4145186

1.8

3.5

144

ENT

A/B

SPLIT

F-INP

V/M

M-CL

PBTC

TWIN PBT

M-CH

LOCK/

SPCH

∂TXRIT

CLEAR

RIT/∂TX

CALL

MONITOR

VOX/BK-IN

P.AMP/ATT

KEY SPEED

CW PITCH

RF PWR

MIC GAIN

HF/VHF TRANSCEIVER

TRANSMIT

PHONES

ELEC-KEY

MIC

TUNER

ANT

NOTCH

RF/SQL

A/NOTCH

CW KEY

MICROPHONES (p. 101)

A straight key can be used when the internal electronic keyer is turned OFF in keyer set mode. (p. 34)

HM-36 SM-20

(optional)

(dot) (com) (dash)

GROUND (p. 13)

Use the heaviest gauge wire or strap available and make the connection as short as possible.

Grounding prevents electrical shocks, TVI and other problems.

ANTENNA 1, 2 (pgs. 13, 75) [Example]: ANT1 for 1.8–18 MHz bands

ANT2 for 21–50 MHz bands

DC POWER SUPPLY

STRAIGHT KEY

PS-125

(Optional)

144 MHz ANTENNA (pgs. 13, 75)

Connect a VHF (60–144 MHz) antenna; impedance: 50 Ω.

(+)

(_)

• Front panel

INSTALLATION AND CONNECTIONS

• Rear panel

POWER

TRANSMIT

PHONES

ELEC-KEY

MIC

/NOTCH

TUNER

ANT

HF/VHF TRANSCEIVER

NOTCH

MIC GAIN

RF PWR

CW PITCH

F 1

F 2F 3F 4F 5

XFC

MP-W

GENE

3.5

1.8

144

ENT

MP-R

LOCK

TWIN PBT

M-CH

RIT

CLEAR

∂TX

RIT/∂TX

SPLIT

PBTC

F-INP

A/B

V/M

M-CL

KEY SPEED

P.AMP/ATT

VOX/BK-IN

MONITOR

CALL

LOCK/

SPCH

RF/SQL

i746PRO

SSB

CW/RTTY

AM/FM

FILTER

HEADPHONES

MIC

The AFSK modulation signal can be input from [MIC]. (p. 78)

AH-2b

AH-4 (p. 77)

ANTENNA 1, 2 (p. 17) Connects a linear amplifier, antenna selector, etc.

[SEND], [ALC] (p. 17) Used for connecting a non-Icom linear amplifier.

When using the AH-4, it must be connected to the [ANT1] connector.

[REMOTE] (p. 95) Used for computer control and transceive operation.

[D ATA] (p. 78)

EXTERNAL SPEAKER (p. 101)

SP-21 (optional)

ACC SOCKETS (pgs. 8, 78)

INSTALLATION AND CONNECTIONS

■ Advanced connections

• Front panel

• Rear panel

INSTALLATION AND CONNECTIONS

30 A fuses

AC cable

Transceiver

AC outlet

A DC power supply

13.8 V; at least 23 A

Black_Red

to DC power socket

Supplied DC power cable

12 V battery

Supplied DC power cable

+ red

_ black

Crimp

Solder

Grommet

PS-125

Connect to an AC outlet using the supplied AC cable.

DC power cable

DC power socket

Transceiver

■ Power supply connections

Use an optional DC power supply with a 25 A capacity and above when operating the transceiver with AC power. Refer to the diagrams below.

CONNECTING PS-125 DC POWER SUPPLY

CAUTION: Before connecting the DC power

cable, check the following important items. Make sure:

• The [POWER] switch is OFF.

•Output voltage of the power source is 12–15 V

when you use a non-Icom power supply.

• DC power cable polarity is correct.

Red : positive + terminal Black : negative _ terminal

CONNECTING A DC POWER SUPPLY

CONNECTING A VEHICLE BATTERY

NEVER connect to

a 24 V battery.

NOTE: Use terminals for the cable connections.

NEVER connect to a battery without supplied DC

fuses, otherwise a ﬁre hazard may occur.

To an antenna

ACC(1)

ANT

ANT1

ACC(2)

INPUT1

REMOTE

EXCITER 1

1&2

GND

IC-PW1

AC outlet

(Non-European versions: 100—120/220—240 V European version : 230 V)

Ground

Transceiver

REMOTE

Remote control cable (supplied with the IC-PW1)

ACC cable (supplied with the IC-PW1)

Be sure to connect the cable to the 7-pin ACC(2) jack.

Coaxial cable

(supplied with the IC-PW1)

Coaxial cable (from AH-4)

ANT1

Transceiver

Ground

AH-4

Control cable

Long wire or optional AH-2b

50 Ω coaxial cable

Non-Icom linear amplifier

SEND

ALC

To an antenna

RF OUTPUT RF INPUT

ALC

SEND

ANT1

Transceiver

INSTALLATION AND CONNECTIONS

■ Linear ampliﬁer connections

CONNECTING THE IC-PW1

Use the [ANT1] connector when connecting a linear ampliﬁer.

Turn OFF the transceiver’s antenna tuner while tuning the IC-PW1’s tuner.

CONNECTING A NON-ICOM LINEAR AMPLIFIER

■ External antenna tuner connections

CONNECTING THE AH-4

The AH-4 must be connected to [ANT1].

R WARNING:

Set the transceiver output power and linear ampliﬁer ALC output level referring to the linear ampliﬁer instruction manual. Be sure the linear ampliﬁer keying circuit control voltage is compatible with the IC746PRO, before connecting to [SEND] jack.

The ALC input level must be in the range 0 V to –4 V, and the transceiver does not accept positive voltage. Non-matched ALC and RF power settings could cause a ﬁre or ruin the linear ampliﬁer.

The speciﬁcations for the SEND relay are 16 V/DC

0.5 A. If this level is exceeded, a large external relay must be used.

BASIC OPERATION

POWER

TRANSMIT

PHONES

ELEC-KEY

MIC

/NOTCH

TUNER

ANT

HF/VHF TRANSCEIVER

NOTCH

MIC GAIN

RF PWR

CW PITCH

F 1

F 2F 3

F 4

F 5

XFC

MP-W

GENE

3.5

1.8

144

ENT

MP-R

LOCK

TWIN PBT

M-CH

RIT

CLEAR

∂TX

RIT/∂TX

SPLIT

PBTC

F-INP

A/B

V/M

M-CL

KEY SPEED

P.AMP/ATT

VOX/BK-IN

MONITOR

CALL

LOCK/

SPCH

RF/SQL

i746PRO

SSB

CW/RTTY

AM/FM

FILTER

[NR]: Max. CCW [NOTCH]: Max. CCW

[AF]: Max. CCW

[TRANSMIT]: OFF

[MIC GAIN]: Max. CCW

[RF PWR]: Max. CCW [CW PITCH]: 12 o’clock

[RF/SQL]: 12 o’clock

[KEY SPEED]: Max. CCW

[POWER] [F-INP] [M-CL]

■ When ﬁrst applying power (CPU resetting)

Before ﬁrst applying power, make sure all connections required for your system are complete by referring to Chapter 2. Then, reset the transceiver using the following procedure.

NOTE: When ﬁrst applying power or when operat- ing in cold environments, the display may ﬂicker or appear faint. This is normal and will disappear once the transceiver has warmed up.

q Make sure the transceiver power is OFF. w While pushing [M-CL] and [F-INP], push [POWER]

for 1 sec. to turn power ON.

• The internal CPU is reset.

•The transceiver displays its initial VFO frequency when

resetting is complete.

e Correct the set mode settings after resetting, if de-

sired.

Resetting CLEARS all programmed contents in memory channels and returns programmed values in set mode to default values.

■ Initial settings

After resetting the transceiver, set controls and switches as shown in the ﬁgure below.

CW : Clockwise CCW : Counterclockwise

Band keys

BASIC OPERATION

■ Selecting an operating band

The transceiver has a triple band stacking register. This means that the last 3 operating frequencies and modes used on a particular band are automatically memorized.

See the table below for a list of the bands available and the default settings for each register.

BAND REGISTER 1 REGISTER 2 REGISTER 3

1.8 MHz 1.900000 MHz CW 1.910000 MHz CW 1.915000 MHz CW

3.5 MHz 3.550000 MHz LSB 3.560000 MHz LSB 3.580000 MHz LSB

7 MHz 7.050000 MHz LSB 7.060000 MHz LSB 7.020000 MHz CW

10 MHz 10.120000 MHz CW 10.130000 MHz CW 10.140000 MHz CW

14 MHz 14.100000 MHz USB 14.200000 MHz USB 14.050000 MHz CW

18 MHz 18.100000 MHz USB 18.130000 MHz USB 18.150000 MHz USB

21 MHz 21.200000 MHz USB 21.300000 MHz USB 21.050000 MHz CW

24 MHz 24.950000 MHz USB 24.980000 MHz USB 24.900000 MHz CW

28 MHz 28.500000 MHz USB 29.500000 MHz USB 28.100000 MHz CW

50 MHz 50.100000 MHz USB 50.200000 MHz USB 51.000000 MHz FM

144 MHz 145.000000 MHz FM 145.100000 MHz FM 145.200000 MHz FM

General 15.000000 MHz USB 15.100000 MHz USB 15.200000 MHz USB

D Using the band stacking registers

q Push [14 5], then select a frequency and an operat-

ing mode.

•Frequency and operating mode are memorized in the ﬁrst band stacking register.

w Push [14 5] again, then select another frequency

and operating mode.

•This frequency and operating mode are memorized in the second band stacking register.

e Push [14 5] again, then select another frequency

and operating mode.

•This frequency and operating mode are memorized in the third band stacking register.

•When a fourth frequency and operating mode are selected on a band, the ﬁrst register set in step q, is overwritten.

[Example]: 14 MHz band

3.5

1. 8

GENE

14 4

ENT

■ Selecting VFO/memory mode

[A/B]

Either one appears

Push for 1 sec.

A/B

[V/M]

VFO is an abbreviation of Variable Frequency Oscillator, and is commonly referred to as a main tuning function. The tuning dial is often called the “VFO knob.”

➥ Push [V/M] to switch between VFO and memory

modes.

•Pushing [V/M] for 1 sec. transfers the contents of the selected memory channel to VFO mode (p. 65).

■ VFO operation

The transceiver has 2 VFOs and are called VFO A and VFO B. You can use the desired VFO to call up a frequency and operating mode for your operation.

BASIC OPERATION

Selecting the VFO A/B

➥ Push [A/B] to switch between the VFO A and

VFO B.

•“VFO A” or “VFO B” appears.

VFO equalization

➥ Push [A/B] for 1 sec. to equalize the undisplayed

VFO condition to the displayed VFO.

•3 beeps sound when the VFO equalization is completed.

CONVENIENT

Use two VFOs as a quick memory

When you find a new station, but you wish to continue searching, the Two VFO system can be used for quick memory storage.

q Push [A/B] for 1 sec. to store the displayed frequency into

the undisplayed VFO.

w Continue searching for stations. e Push [A/B] to retrieve the stored frequency. r To continue searching for a station, push [A/B] again.

Band keys

Tuning dial

[TS]Select mode

1kHz

SSB

⁄4 indicator

HIGH

DIAL Auto TS

BASIC OPERATION

■ Frequency setting

The transceiver has several tuning methods for convenient frequency tuning.

Tuning with the tuning dial

q Push the desired band key on the keypad 1–3

times.

•3 different frequencies can be selected on each band with the band key. (p. 19)

w Rotate the tuning dial to set the desired frequency.

If the dial lock function is activated, the lock indicator lights, and the tuning dial does not function. In this case, push [LOCK/SPCH] to deactivate the lock function. (see p. 53 for details)

Quick tuning step

The operating frequency can be changed in kHz steps (0.1, 1, 5, 9, 10, 12.5, 20 or 25 kHz selectable) for quick tuning.

q Push [SSB], [CW/RTTY] or [AM/FM] to select the

desired operation mode.

w Push [TS] momentarily to activate the quick tuning

function.

•“▼” appears.

e Push [TS] for 1 sec. to enter the tuning step set

mode.

r Rotate the tuning dial to select the desired tuning

step.

t Push [TS] to exit the tuning step set mode.

⁄4 Tuning step function (SSB data, CW and RTTY only)

While operating in SSB data/CW/RTTY, the 1⁄4 function is available for critical tuning. Dial rotation is reduced to

⁄4 of normal when the 1⁄4 function is in use.

➥ While M1 is selected with [MENU], push [F3 1/4]

to toggle the

⁄4 function ON and OFF.

D Auto tuning step function

When rotating the tuning dial rapidly, the tuning step automatically changes several times as selected.

q Push [MENU] for 1 sec. to enter the set mode. w Push [F1≤] or [F2 ≥] to select the DIAL Auto

TS item.

e Rotate the tuning dial to select the function ON

(HIGH or LOW) and OFF.

• HIGH : Approx. 5 times faster

• LOW : Approx. 2 times faster

• OFF : Auto tuning step is turned OFF.

r Push [MENU] to exit the set mode.

Lights when keypad input is activated.

Keypad [F-INP]

21.280 MHz 21.245 MHz

14.025 MHz

Push

[EXAMPLE]

3.5

1. 8

F-INP

GENE

3.5

GENE

144

ENT

706 kHz

Push

144

ENT

144

ENT

F-INP

GENE

Push

F-INP

Selecting the 1 Hz step

The minimum tuning step of 1 Hz can be used for ﬁne tuning.

q Push [TS] momentarily to turn the quick tuning step

OFF

•“▼” disappears.

w Push [TS] for 1 sec. to toggle the 1 Hz tuning step

ON and OFF.

Band edge warning beep

When selecting a frequency that lies outside of a band’s specified frequency range, a warning beep sounds.

This function can be turned OFF in set mode, if desired. (p. 82)

BASIC OPERATION

[TS]

1 Hz indicator

The transceiver has a keypad for direct frequency entry as described below.

q Push [F-INP].

w Input the desired frequency.

e Push [144 ENT] to enter the input frequency.

Frequency setting with the keypad

• F-INP indicator lights

•Input “•” (decimal point) between the MHz units and kHz

units.

• To cancel the input, push [A/B] instead of [144 ENT].

AF RF/SQL

No audio output

Max. audio output

Decreases Increases

[SSB] [CW/RTTY] [AM/FM]

SSB

CW/RTTY

AM/FM

D USB USB

CW-R CW

D AM AM

Push mode switch for 1 sec.

Push mode switch momentarily.

LSB D LSB

RTTY RTTY-R

FM D FM

BASIC OPERATION

■ Operating mode selection

SSB (USB/LSB), SSB data (USB data/LSB data), CW, CW reverse (CW-R), RTTY, RTTY-R (RTTY reverse), AM, AM data, FM and FM data modes are available in the IC-746PRO. Select the desired operation mode as follows.

To select a mode of operation, push the desired mode switch momentarily. Push the switch again to toggle between USB and LSB, CW/CW-R and RTTY/RTTYR, AM and FM, if necessary. Push the switch for 1 sec. to toggle between CW and CW-R, RTTY and RTTY-R, or to select data mode, if necessary. See the diagram below right for the order of selection.

Microphone signals are muted when data mode is selected.

• Selecting SSB mode

➥ Push [SSB] to select USB or LSB.

•USB is selected ﬁrst when above 10 MHz; or LSB is selected ﬁrst when below 10 MHz operation.

•After USB or LSB is selected, push [SSB] to toggle between USB and LSB.

•After USB or LSB is selected, push [SSB] for 1 sec. to select USB data or LSB data mode, respectively.

• Selecting CW/RTTY mode

➥ Push [CW/RTTY] to select CW or RTTY.

•After CW/CW-R or RTTY/RTTY-R is selected, push [CW/RTTY] to toggle between CW and RTTY.

•After CW or RTTY is selected, push [CW/RTTY] for 1 sec. to toggle between CW and CW reverse, or, RTTY and RTTY reverse mode, respectively.

• Selecting AM/FM mode

➥ Push [AM/FM] to select AM or FM.

•After AM or FM is selected, push [AM/FM] to toggle between AM and FM mode.

•After AM or FM is selected, push [AM/FM] for 1 sec. to select AM data or FM data mode, respectively.

■ Volume setting

➥ Rotate [AF] control to output a suitable audio level.

[AF] control

Squelch is open.

S-meter squelch

S-meter squelch threshold

Noise squelch threshold (FM mode)

Shallow Deep

Noise squelch (FM mode)

Minimum RF gain

Adjustable range

Maximum RF gain

Recommended level

RF gain adjustable range

Maximum RF gain

S-meter squelch

Noise squelch (FM mode)

Squelch is open.

■ Squelch and receive (RF) sensitivity

[RF/SQL] control

Adjusts the RF gain and squelch threshold level. The squelch removes noise output from the speaker (closed position) when no signal is received.

•The squelch is particularly effective for FM. It is also available for other modes.

•The control can be set as the RF gain control only (squelch is ﬁxed open) or squelch control (RF gain is ﬁxed at maximum) in set mode (p. 82). See below right.

•The 11 to 12 o’clock position is recommended for any set- ting of the [RF/SQL] control.

BASIC OPERATION

SET MODE OPERATION

Can be used in all modes.

RF+SQL

(default)

Functions as noise squelch or S-meter squelch in AM and FM; S-meter squelch only in other modes.

SQL

➥ Operates as a squelch control.

• RF gain is ﬁxed at max. sensitivity.

➥ Operates as an RF gain control in

SSB, CW and RTTY.

AUTO •Squelch is ﬁxed open.

➥ Operates as a squelch control in AM

and FM.

• RF gain is ﬁxed at max. sensitivity.

Adjusting RF gain (Receive sensitivity)

Normally, [RF/SQL] is set to the 11 o’clock position. Rotate [RF/SQL] to the 11 o’clock position for maximum sensitivity.

•Rotating counterclockwise from the maximum position reduces sensitivity.

• The S-meter indicates receive sensitivity.

• When setting as RF gain/squelch control

• When functioning as RF gain control (Squelch is

ﬁxed open; SSB, CW, RTTY only)

Adjusting squelch (Removing non-signal noise)

Rotate [RF/SQL] clockwise when receiving no signal, until the noise just disappears.

• [RX] indicator light goes out.

•Rotating [RF/SQL] past the threshold point invokes the S-

meter squelch— this allows you to set a minimum signal level needed to open the squelch.

•When functioning as squelch control (RF gain is

ﬁxed at maximum)

[TRANSMIT]

[RF PWR][MIC GAIN]

[TX] indicator

ALC zone

BASIC OPERATION

■ Basic transmit operation

Before transmitting, monitor your selected operating frequency to make sure transmitting won’t cause interference to other stations on the same frequency. It’s good Amateur practice to listen first, and then, even if nothing is heard, ask “is the frequency in use” once or twice, before you begin operating on that frequency.

Transmitting

Before transmitting, monitor your selected operating frequency to make sure transmitting won’t cause interference to other stations on the same frequency.

q Push [TRANSMIT] or [PTT] (microphone) to trans-

mit.

• The [TX] indicator lights red.

w Push [TRANSMIT] again or release [PTT] (micro-

phone) to return to receive.

Microphone gain adjustment

Before transmitting, monitor your selected operating frequency to make sure transmitting won’t cause interference to other stations on the same frequency.

q Push [PTT] (microphone) to transmit.

• Talk into the microphone at your normal voice level.

w While talking into the microphone, rotate [MIC

GAIN] so that the ALC meter reading doesn’t go outside the ALC zone (see right).

e Release [PTT] (microphone) to return to receive.

RECEIVE AND TRANSMIT

Band keys[TX] indicator[TRANSMIT]

[MIC GAIN] [SSB] Tuning dial

“LSB” or “USB” appears

■ Operating SSB

q Push a band key to select the desired band. w Push [SSB] to select LSB or USB.

•Below 10 MHz LSB is automatically selected; above 10 MHz USB is automatically selected.

e Rotate [AF] to set audio to a comfortable listening

level.

r Rotate the tuning dial to tune a desired signal.

• S-meter indicates received signal strength.

t Push [TRANSMIT] or [PTT] (microphone) to trans-

mit.

• The TX indicator lights red.

y Speak into the microphone at your normal voice

level.

• Adjust [MIC GAIN] at this step, if necessary.

u Push [TRANSMIT] or release [PTT] (microphone) to

return to receive.

Convenient functions for receive

• Preamp and attenuator (p. 48)

➥ Push [P.AMP/ATT] several times to set the pre-

amp OFF, preamp 1 ON or preamp 2 ON.

•“P.AMP1,” “P.AMP2” or “P.AMP” appears when the

preamp 1, preamp 2 or preamp is set to ON, respectively. (depending on operating frequency band)

➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator

ON.

•Push [P.AMP/ATT] momentarily to turn the attenuator OFF.

•“ATT” appears when the attenuator is set to ON.

• Noise blanker (p. 51) ➥ Push [NB] to turn the noise blanker ON and OFF.

•“NB” appears when the noise blanker is set to ON.

• Push [NB] for 1 sec. to enter noise blanker set mode.

• Noise reduction (p. 53)

➥

Push [NR] to turn the noise reduction ON and OFF.

•Rotate [NR] control to adjust the noise reduction level.

•“NR” appears when the noise reduction is set to ON.

Convenient functions for transmit

• Speech compressor (p. 58)

➥ While M1 is selected with [MENU], push

[F3 CMP] to turn the speech compressor ON and OFF.

•“COMP” appears when the speech compressor is set to ON.

• VOX (voice operated transmit) (p. 55) ➥ Push [VOX/BK-IN] to turn the VOX function ON

and OFF.

•“VOX” appears when the VOX function is set to ON.

• Auto notch ﬁlter (p. 53)

➥ Push [A/NOTCH] to turn the auto or manual

notch function ON and OFF.

•Rotate [NOTCH] control to set the attenuating frequency for manual notch operation.

• Twin PBT (passband tuning) (p. 52) ➥ Rotate [TWIN PBT] controls (inner/outer).

• Push [PBTC] to clear the settings.

• AGC (auto gain control) (p. 49) ➥ While M1 is selected with [MENU], push

[F1 AGC] several times to select AGC F, AGC M, AGC S or AGC OFF.

• VSC (voice squelch control) (p. 54) ➥ While M2 is selected with [MENU], push

[F5 VSC] to turn the VSC function ON and OFF.

•The VSC indicator appears when the voice squelch function is set to ON.

• Transmit quality monitor (p. 57) ➥ Push [MONITOR] to turn the monitor function ON

and OFF.

•“MONI” appears when the monitor function is set to ON.

• Audio tone control (p. 89)

➥ While M2 is selected with [MENU], push [F4

TCN], select an item with [F1 ≤] and [F2 ≥] then

rotate the tuning dial to adjust the audio tone.

Band keys[TX] indicator[TRANSMIT]

[CW PITCH]

[KEY SPEED]

[CW/RTTY]

Tuning dial

“CW” or “CW-R” appears

RECEIVE AND TRANSMIT

■ Operating CW

q Push a band key to select the desired band. w Push [CW/RTTY] to select CW.

•After CW mode is selected, push [CW/RTTY] for 1 sec. to toggle between CW and CW-R modes.

e Rotate [AF] to set audio to a comfortable listening

level.

r Rotate the tuning dial to simultaneously tune a de-

sired signal and its side tone.

• S-meter indicates received signal strength.

t Push [TRANSMIT] to transmit.

• The TX indicator lights red.

y Use the electric keyer or paddle to key your CW sig-

nals.

• The Po meter indicates transmitted CW signal strength.

u Adjust CW speed with [KEY SPEED]. i Push [TRANSMIT] to return to receive.

Convenient functions for receive

• Preamp and attenuator (p. 48)

➥ Push [P.AMP/ATT] several times to set the pre-

amp OFF, preamp 1 ON or preamp 2 ON.

•“P.AMP1,” “P.AMP2” or “P.AMP” appears when the

preamp 1, preamp 2 or preamp is set to ON, respectively. (depending on operating frequency band)

➥

Push [P.AMP/ATT] for 1 sec. to set the attenuator ON.

•Push [P.AMP/ATT] momentarily to turn the attenuator OFF.

•“ATT” appears when the attenuator is set to ON.

• Noise blanker (p. 51) ➥ Push [NB] to turn the noise blanker ON and OFF.

•“NB” appears when the noise blanker is set to ON.

• Push [NB] for 1 sec. to enter noise blanker set mode.

• Noise reduction (p. 53)

➥ Push [NR] to turn the noise reduction ON and OFF.

•Rotate [NR] control to adjust the noise reduction level.

•“NR” appears when the noise reduction is set to ON.

Convenient functions for transmit

• Break-in function (p. 56)

➥ Push [VOX/BK-IN] several times to set the break-

in OFF, semi break-in or full break-in.

•“BK-IN” or “F BK-IN” appears when the semi break-in

or full break-in is set to ON, respectively.

• Auto notch ﬁlter (p. 53)

➥ Push [A/NOTCH] to turn the auto or manual

notch function ON and OFF.

•Rotate [NOTCH] control to set the attenuating frequency for manual notch operation.

• Twin PBT (passband tuning) (p. 52) ➥ Rotate [TWIN PBT] controls (inner/outer).

• Push [PBTC] to clear the settings.

• AGC (auto gain control) (p. 49) ➥ While M1 is selected with [MENU], push

[F1 AGC] several times to select AGC F, AGC M, AGC S or AGC OFF.

•1⁄4 function (p. 21) ➥ While M1 is selected with [MENU], push

[F3 1/4] to turn the 1⁄4 function ON and OFF.

Push for 1 sec.

BFO

CW-R mode (USB side)

BFO

Desired signal

CW mode (LSB side)

Interference

Desired signalInterference

CW/RTTY

[CW PITCH]

[KEY SPEED]

About CW reverse mode

CW reverse mode receives CW signals with a reverse side CW carrier point like that of LSB and USB modes.

Use when interfering signals are near a desired signal and you want to change the interference tone.

q Push [CW/RTTY] several times to select CW mode. w Push [CW/RTTY] for 1 sec. to select CW or CW-R

mode.

• Check the interfering tone.

About CW pitch control

The received CW audio pitch and monitored CW audio can be adjusted to suit your preference (300 to 900 Hz in 25 Hz steps) without changing the operating frequency.

RECEIVE AND TRANSMIT

About keying speed

The transceiver’s internal electronic keyer speed can be adjusted from 6 to 60 wpm. ➥ Rotate [KEY SPEED] clockwise to increase keying

speed; counterclockwise to decrease keying speed.

CW side tone function

When the transceiver is in the receive condition (and the break-in function is OFF— p. 56) you can listen to the tone of your CW signal without actually transmitting. This allows you to match your transmit signal exactly to another station’s. This also convenient for CW practice. CW side tone level can be adjusted in keyer set mode (p. 33).

F 1F 2F 3F 4F 5

AGC DUP 1/4 KEY SCP

-1

5O%1

Side

Tone Level

Normal1

Number

Style

TEST CQ TEST

DEL SPC

Push [F4]

Push [MENU]

Push [F4]

Push [F2]

Push [F3]

Push [F5]

• Keyer send menu (p. 30)

SND EDT 001 SET

• Memory keyer menu

• Keyer set mode (p. 33)

• Contest number set mode (p. 32)

• Edit menu (p. 31)

[MENU] [CW/RTTY]

RECEIVE AND TRANSMIT

■ Electronic keyer functions

The transceiver has a number of convenient functions for the electronic keyer that can be accessed from the memory keyer menu.

q Push [CW/RTTY] to select CW mode. w Push [MENU] to select M1. e Push [F4 KEY] to select the memory keyer menu.

•The selectable menu can be changed with the keyer send menu in the set mode. (p. 87)

r Push one of the multi-function keys ([F1] to [F5]) to

select an item in the memory keyer menu. See the diagram below.

• Push [MENU] to return to the previous indication.

IN CW MODE

F 1

F 2F 3

F 4

F 5

F 2

F 1

F 4

F 3

Repeat indicators Count up trigger

indicator

Counter

-1

M2 send indication

-1

TEST CQ

001

TEST CQ

001

QRZ?

-1

5NN001 B 001

001

-1

5NN001 B 001

CFM

001

M1 send indication

M2 send indicationRepeat send indication

-1

M4 send indication

-1

M3 send indication

Memory keyer send menu

Pre-set characters can be sent using the keyer send menu. Contents of the memory keyer are set using the edit menu.

• Transmitting

q While M1 is selected in CW mode, push [F4 KEY]

to select the memory keyer menu.

w Push [F2 SND] to select the keyer send menu. e Push [TRANSMIT] to set the transceiver to trans-

mit, or set the break-in function ON (p. 56).

r Push one of the function keys ([F1] to [F4]) to send

the contents of the memory keyer.

•Pushing a function key for 1 sec. repeatedly sends the contents; push any function key to cancel the transmission.

•The contest number counter, above [F5], is incremented each time the contents are sent.

•Push [F5] to reduce the contact number count by 1 when resending contents to unanswered calls.

For your information

When an external keypad is connected to the pin 3 and pin 7 of the [MIC] connector, the programmed contents, M1—M4, can be transmitted without selecting the keyer send menu. See p. 87 for details.

RECEIVE AND TRANSMIT

t Push [MENU] 2 times to return to M1.

RECEIVE AND TRANSMIT

Editing a memory keyer

The contents of the memory keyer memories can be set using the memory keyer edit menu. The memory keyer can memorize and re-transmit 4 CW key codes for often-used CW sentences, contact numbers, etc. Total capacity of the memory keyer is 50 characters per memory channel.

• Programming contents

q Push [MENU] to select M1, then push [F4 KEY] to

select the memory keyer menu.

w Push [F3 EDIT] to select edit menu.

•Memory keyer contents of the Channel 1 (M1) is indi- cated.

• Push [F5] to manually increment the contest number.

e Push [F1] to select the desired memory keyer chan-

nel to be edited.

r Input the desired character by rotating the tuning

dial or by pushing the keypad for number input.

• Selectable characters (with the tuning dial);

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z / ? . , * ^

• Edit menu

F 1

CQ TEST CQ TEST

F 2F 3

DEL SPC

F 4

F 5

NOTE:

“^” is used to transmit a following word with no space such as

. Put “^” before a text string such as ^AR, and the string “AR” is sent with no space. “*” is used to insert the CW contact number. The contact number automatically increments by 1. This function is only available for one memory keyer channel at a time. Memory keyer channel M2 used “*” by default.

t Push [F2 ç] or [F3 å] to move the cursor back-

wards or forwards, respectively.

y Repeat steps r and t to input the desired charac-

ters.

u Push [MENU] 2 times to return to M1.

Pre-programmed contents

CH Contents

M1 CQ TEST CQ TEST DE JA1 JA1 TEST

M2 UR 5NN* BK

M3 CFM TU

M4 QRZ?

Move cursor left/right

Select M1 to M4

Clear character

Input space

¥ M2 default indication

5NN* BK

When inputting an asterisk, the counter is incremented by 1.

DEL SPC

¥ M3 default indication

CFM TU

DEL SPC

¥ M4 default indication

QRZ?

DEL SPC

Example display— when inputting QSL TU DE JA3YUA TEST into M3.

QSL TU DE JA3Y

JA3YUA TEST å

DEL SPC

F 1

F 2F 3

F 4

F 5

Set item up/down

5O%

Side

Tone Level

M22

Count

Up Trig

Normal1

Number

Style

CLR

0013

Present

Number

Contest number set mode

This menu is used to set the contest (serial) number and count up trigger, etc.

• Setting contents

q Push [MENU] to select M1, then push [F4 KEY] to

select the memory keyer menu.

w Push [F4 001] to enter the contest number set

mode.

e Push [F1≤] or [F2 ≥] to select the desired set item. r Set the desired condition using the tuning dial.

•Push [F3] for 1 sec. to select a default condition or value.

t Push [MENU] 2 times to return to M1.

RECEIVE AND TRANSMIT

1. Number Style

This item sets the numbering system used for contact (serial) numbers— normal or morse cut numbers.

•Normal : Does not use morse cut number

(default)

•190 ANO : Sets 1 as A, 9 as N and 0 as O.

•190 ANT : Sets 1 as A, 9 as N and 0 as T.

• 90 NO : Sets 9 as N and 0 as O.

• 90 NT : Sets 9 as N and 0 as T.

2. Count Up Trig

This selects which of the four memory slots will have the contest serial number exchange. The count up trigger allows the serial number to e automatically incremented after each complete serial number exchange is sent.

• M1, M2, M3 and M4 can be set. (default: M2)

3. Present Number

This item shows the current number for the count up trigger channel set above.

•Rotate the tuning dial to change the number, or push [F3 CLR] for 1 sec. to reset the current number to 001.

F 1

F 2F 3

F 4

F 5

Set item up/down

5O%

Side

Tone Level

5O%1

Side

Tone Level

ON2

Side

Tone L-lmt

2s3

Repeat

Time

1:1:3.O4

Dot/Dash

Ratio

)

RECEIVE AND TRANSMIT

Keyer set mode

This set mode is used to set the CW side tone, memory keyer repeat time, dash weight, paddle speciﬁca- tions, keyer type, etc.

• Setting contents

q Push [MENU] to select M1, then push [F4 KEY] to

select the memory keyer menu.

w Push [F5 SET] to select keyer set mode. e Push [F1≤] or [F2 ≥] to select the desired set item. r Set the desired condition using the tuning dial.

•Push [F3] for 1 sec. to select a default condition or value.

t Push [MENU] 2 times to return to M1.

1. Side Tone Level

This item sets the CW side tone output level.

• 0 to 100% in 1% steps can be selected.

2. Side Tone L-lmt

This item sets the CW side tone level limit. When the [AF] control is rotated above a speciﬁed level, the CW side tone does not increase.

ON CW side tone level is limited. (default) OFF CW side tone level is not limited.

3. Repeat Time

When sending CW using the repeat timer, this item sets the time between transmission.

• 1 to 60 sec. in 1 sec. steps can be selected.

4. Dot/Dash Ratio

This item sets the dot/dash ratio.

• 1:1:2.8 to 1:1:4.5 (in 0.12 steps) can be selected.

Keying weight example: Morse code “K”

DOT (fixed*) Weight setting: 1:1:3 (default)

Weight setting: Adjusted

ustable range SPACE (fixed*

DASH

*SPACE and DOT length can be

adjusted with [KEY SPEED] only.

5. Rise Time

4ms5

Rise

Time

Key action

Tx output power

• About rise time

Set Tx power level

Time

NORMAL6

Paddle

Polarity

ELEC-KEY7

Keyer

Type

OFF8

MIC

U/D Keyer

This item sets the envelop time period which the output power becomes the set transmit power.

• 2, 4, 6 or 8 msec. can be selected.

6. Paddle Polarity

This item sets the paddle polarity.

• Normal and reverse polarity can be selected.

RECEIVE AND TRANSMIT

7. Keyer Type

This item selects the keyer type for [ELEC-KEY] connector on the front panel.

• ELEC-KEY, BUG KEY and Straight key can be selected.

8. MIC U/D Keyer

This item allows you to set the microphone [UP]/[DN] keys to be used as a paddle.

ON [UP]/[DN] switches can be used for CW. OFF [UP]/[DN] switches cannot be used for

CW.

NOTE: When “ON” is selected, the frequency and

memory channel cannot be changed using the [UP]/[DN] switches.

Band keys[TX] indicator[TRANSMIT]

[CW/RTTY] Tuning dial

“RTTY” or “RTTY-R” appears

RECEIVE AND TRANSMIT

■ Operating RTTY (FSK)

Before operating RTTY, be sure to consult the manual that comes with your TNC.

q Push a band key to select the desired band. w Push [CW/RTTY] several times to select RTTY.

• After RTTY mode is selected, push [CW/RTTY] for 1 sec. to toggle RTTY and RTTY-R modes.

e Rotate [AF] to set audio to a comfortable listening

level.

r Rotate the tuning dial to tune a desired signal.

• S-meter indicates received signal strength.

•If the received signal cannot be demodulated, try select-

ing RTTY-R mode.

t Push [TRANSMIT] to set the transceiver to the

transmit condition or transmit a SEND signal from your TNC.

• The TX indicator lights red.

•

The Po meter indicates transmitted RTTY signal strength.

y Operate the connected PC or TNC (TU) to transmit

RTTY (FSK) signals.

• Adjust [MIC GAIN] at this step, if necessary.

u Push [TRANSMIT] to return to receive.

Convenient functions for receive

• Preamp and attenuator (p. 48)

➥ Push [P.AMP/ATT] several times to set the pre-

amp OFF, preamp 1 ON or preamp 2 ON.

•“P.AMP1,” “P.AMP2” or “P.AMP” appears when the

preamp 1, preamp 2 or preamp is set to ON, respectively. (depending on operating frequency band)

➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator

ON.

•Push [P.AMP/ATT] momentarily to turn the attenuator OFF.

•“ATT” appears when the attenuator is set to ON.

• Noise blanker (p. 51) ➥ Push [NB] to turn the noise blanker ON and OFF.

•“NB” appears when the noise blanker is set to ON.

• Push [NB] for 1 sec. to enter noise blanker set mode.

Convenient functions for transmit

• Transmit quality monitor (p. 57)

➥ Push [MONITOR] to turn the monitor function ON

and OFF.

•“MONI” appears when the monitor function is set to ON.

• Noise reduction (p. 53) ➥ Push [NR] to turn the noise reduction ON and OFF.

•Rotate [NR] control to adjust the noise reduction level.

•“NR” appears when the noise reduction is set to ON.

• Twin PBT (passband tuning) (p. 52)

➥ Rotate [TWIN PBT] controls (inner/outer).

• Push [PBT C] to clear the settings.

• AGC (auto gain control) (p. 49)

➥ While M1 is selected with [MENU], push

[F1 AGC] several times to select AGC F, AGC M, AGC S or AGC OFF.

•1⁄4 function (p. 21) ➥ While M1 is selected with [MENU], push

[F3 1/4] to turn the 1⁄4 function ON and OFF.

■ RTTY functions

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

AGC DUP 1/4 RTY SCP

DEC

FIL SET

21251

RTTY

Mark

35O1

Band

Width

ADJ

RTTY-FIL ON

DEC

FIL SET

• RTTY menu

• RTTY decoder screen (p. 38)

• RTTY filter set mode (p. 37)

• RTTY set mode (p. 39)

Push [F4]

Push [F4] for 1 sec.

Switches RTTY filter ON and OFF.

Push [F4]

Push [F5]

Push [F2]

[MENU] [CW/RTTY]

Normal Reverse

170

2125

BFOBFO

Space

Mark

The transceiver has a number of convenient functions for the RTTY operation that can be accessed from the RTTY menu.

q Push [CW/RTTY] to select RTTY mode. w Push [MENU] to select M1. e Push [F4 RTY] to select the RTTY menu. r Push one of the multi-function keys ([F2], [F4] or

[F5]) to select an item in the RTTY menu. See the diagram below.

• Push [MENU] to return to the previous indication.

IN RTTY MODE

RECEIVE AND TRANSMIT

About RTTY reverse mode

Received characters are occasionally garbled when the receive signal is reversed between MARK and Space. This reversal can be caused by incorrect TNC connections, setting, commands, etc. To receive reversed RTTY signals correctly, select RTTY-R mode.

➥ While RTTY mode is selected, push [CW/RTTY]

for 1 sec. to select the RTTY reverse mode.

•“RTTY-R” appears when the RTTY reverse mode is se- lected.

•Push [CW/RTTY] for 1 sec. again to select the normal RTTY mode.

F2 F3 F4 F5

AGC DUP 1/4 RTY SCP

DEC

FIL SET

RTTY-FIL ON

Push [F4]

Disappears when the RTTY filter is turned OFF.

RTTY filter indicator

Rotate the tuning dial to the point where both sides of the dots appear equally.

35O1

Band

Width

ON2

Twin

Peak FIL

RECEIVE AND TRANSMIT

RTTY ﬁlter/Twin peak ﬁlter

The transceiver has 5 RTTY ﬁlters in addition to normal IF filters. The passband width can be selected from 1 kHz, 500 Hz, 350 Hz, 300 Hz and 250 Hz. When the RTTY ﬁlter is turned ON, the RTTY tuning meter can be used. Moreover, the twin peak ﬁlter changes the receive frequency response by boosting 2 particular frequencies (2125 and 2295 Hz) for better copying of desired RTTY signals.

• RTTY ﬁlter and twin peak ﬁlter setting

q Push [CW/RTTY] to select RTTY mode.

•After RTTY mode is selected, push [CW/RTTY] for 1 sec. to select RTTY-R mode.

w Push [MENU] several times to select M1. e Push [F4 RTY] to select RTTY menu. r Push [F4 FIL] to turn the RTTY ﬁlter ON and OFF.

•When the RTTY ﬁlter is turned ON, the normal IF ﬁlter

number indication (1, 2 or 3) disappears.

t Push [F4 FIL] for 1 sec. to enter RTTY filter set

mode (see below).

y Push [F1≤] to select bandwidth item. u Rotate the tuning dial to select the RTTY ﬁlter width

from 1 kHz, 500 Hz, 350 Hz, 300 Hz and 250 Hz.

• Push [F3] for 1 sec. to select a default value.

i Push [F2 ≥] to select twin peak ﬁlter item.

•The received audio volume may become greater when the twin peak ﬁlter is turned ON.

o Rotate the tuning dial to turn the twin peak filter

function ON and OFF.

!0 Push [MENU] 2 times to return to M1.

• RTTY ﬁlter set mode

1. Band Width

This item sets the RTTY ﬁlter width.

• 250, 300, 350, 500 Hz and 1 kHz can be selected.

2. Twin Peak FIL

This item turns the twin peak ﬁlter ON and OFF.

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

AGC DUP 1/4 RTY SCP

DEC

FIL SET

ADJ

RTTY-FIL ON

Push [F4]

Push [F2]

Appears while the RTTY decoder screen is freezed with [F2] operation. Push [F3] to erase the displayed characters.

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

ADJ

Push [F1]

Threshold level indication

RTTY decoder

The transceiver has an RTTY decoder for Baudot (mark freq.: 2125 Hz, shift freq.: 170 Hz, 45 bps).

An external terminal unit (TU) or terminal node connector (TNC) is not necessary for receiving a Baudot signal.

q Push [CW/RTTY] to select RTTY mode.

•After RTTY mode is selected, push [CW/RTTY] for 1 sec. to select RTTY-R mode.

w Push [MENU] several times to select M1. e Push [F4 RTY] to select RTTY menu. r Push [F4 FIL] to turn the RTTY ﬁlter ON.

•The RTTY decoder does not function when the RTTY ﬁlter is turned OFF.

t Push [F2 DEC] to turn the RTTY decoder ON.

• RTTY decoder screen appears.

y Push [F2] to freeze the current screen.

•“H” appears while the function is in use.

u Push [F3] for 1 sec. to clear the displayed charac-

ters.

i Push [MENU] to exit the RTTY decoder screen.

RECEIVE AND TRANSMIT

• Setting the decoder threshold level

Adjust the RTTY decoder threshold level if some characters are displayed when no signal is received.

q Call up the RTTY decoder screen as described

above.

w Push [F1 ADJ] to select the threshold level setting

condition.

e Rotate the tuning dial to adjust the RTTY decoder

threshold level.

• Push [F3] for 1 sec. to select the default condition.

r Push [MENU] to exit the RTTY decoder screen.

The number of line of text can be selected from 2 or 3 in the display. The UnShift On Space (USOS) function and new line code can be set in the RTTY set mode. (p. 39)

F 1

F 2 F 3 F 4 F 5

21251

RTTY

Mark

Set item up/down

21251

RTTY

Mark

17O2

RTTY

Shift

NORMAL

RTTY

Keying

Decode

USOS

CR,LF,CR+LF

Decode

New Line

3line

Decode

Screen

This set mode is used to set the mark and shift frequencies, keying type, decode USOS function, etc.

• Setting contents

q Push [MENU] to select M1, then push [F4 RTY] to

w Push [F5 SET] to select RTTY set mode. e Push [F1≤] or [F2 ≥] to select the desired set item. r Set the desired condition using the tuning dial.

t Push [MENU] 2 times to return to M1.

RECEIVE AND TRANSMIT

RTTY set mode

select the RTTY menu.

•Push [F3] for 1 sec. to select a default condition or value.

1. RTTY Mark

Sets the mark frequency for RTTY operation.

• 1275, 1615 and 2125 Hz are selectable.

2. RTTY Shift

Sets the shift frequency for RTTY operation.

• 170, 200 and 425 Hz are selectable.

3. RTTY Keying

Selects the keying polarity from normal and reverse.

NORMAL Key open/close = Mark/Space REVERSE Key open/close = Space/Mark

4. Decode USOS

Turn the USOS (UnShift On Space) function ON/OFF

ON Decode as letter code OFF Decode as character code

5. Decode New Line

Selects the new line code of the internal RTTY decoder. CR: Carriage Return; LF: Line Feed

CR,LF,CR+LF CR, LF and CR+LF CR+LF CR+LF only

6. Decode Screen

Selects the number of the decoder indication from 2 or 3 lines.

■ Operating AM

Band keys[TX] indicator[TRANSMIT]

[MIC GAIN] [AM/FM] Tuning dial

Appears

q Push a band key to select the desired band. w Push [AM/FM] to select AM. e Rotate [AF] to set audio to a comfortable listening

level.

r Rotate the tuning dial to tune a desired signal.

• S-meter indicates received signal strength.

•The default tuning step for AM mode is 1 kHz; this can

be changed using the tuning step program mode. (p. 21)

t Push [TRANSMIT] or [PTT] (microphone) to trans-

mit.

• The TX indicator lights red.

y Speak into the microphone at your normal voice

level.

• Adjust [MIC GAIN] at this step, if necessary.

u Push [TRANSMIT] or release [PTT] (microphone) to

return to receive.

RECEIVE AND TRANSMIT

Convenient functions for receive

• Preamp and attenuator (p. 48)

➥ Push [P.AMP/ATT] several times to set the pre-

amp OFF, preamp 1 ON or preamp 2 ON.

•“P.AMP1,” “P.AMP2” or “P.AMP” appears when the

preamp 1, preamp 2 or preamp is set to ON, respectively. (depending on operating frequency band)

➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator

ON.

•Push [P.AMP/ATT] momentarily to turn the attenuator OFF.

•“ATT” appears when the attenuator is set to ON.

• Noise blanker (p. 51) ➥ Push [NB] to turn the noise blanker ON and OFF.

•“NB” appears when the noise blanker is set to ON.

• Push [NB] for 1 sec. to enter noise blanker set mode.

• Noise reduction (p. 53)

➥

Push [NR] to turn the noise reduction ON and OFF.

•Rotate [NR] control to adjust the noise reduction level.

•“NR” appears when the noise reduction is set to ON.

Convenient functions for transmit

• Speech compressor (p. 58)

➥ While M1 is selected with [MENU], push [F3

CMP] to turn the speech compressor ON and

OFF.

•“COMP” appears when the speech compressor is set to ON.

• VOX (voice operated transmit) (p. 55) ➥ Push [VOX/BK-IN] to turn the VOX function ON

and OFF.

•“VOX” appears when the VOX function is set to ON.

• Auto notch ﬁlter (p. 53)

➥ Push [A/NOTCH] to turn the auto or manual

notch ﬁlter ON and OFF.

•Rotate [NOTCH] control to set the attenuating frequency for manual notch operation.

• IF shift (p. 52) ➥ Rotate [TWIN PBT] controls (inner only).

• Push [PBTC] to clear the settings.

• AGC (auto gain control) (p. 49)

➥ While M1 is selected with [MENU], push [F1

AGC] several times to select AGC F, AGC M,

AGC S or AGC OFF.

• VSC (voice squelch control) (p. 54) ➥ While M2 is selected with [MENU], push

[F5 VSC] to turn the VSC function ON and OFF.

•The VSC indicator appears when the voice squelch function is set to ON.

• Transmit quality monitor (p. 57) ➥ Push [MONITOR] to turn the monitor function ON

and OFF.

•“MONI” appears when the monitor function is set to ON.

• Audio tone control (p. 89)

➥ While M2 is selected with [MENU], push [F4

TCN], select an item with [F1 ≤] and [F2 ≥] then

rotate the tuning dial to adjust the audio tone.

Band keys[TX] indicator[TRANSMIT]

[MIC GAIN] [AM/FM] Tuning dial

Appears

RECEIVE AND TRANSMIT

■ Operating FM

q Push a band key to select the desired band. w Push [AM/FM] to select FM. e Rotate [AF] to set audio to a comfortable listening

level.

r Rotate the tuning dial to tune a desired signal.

• S-meter indicates received signal strength.

t Push [TRANSMIT] or [PTT] (microphone) to trans-

mit.

• The TX indicator lights red.

y Speak into the microphone at your normal voice

level.

• Adjust [MIC GAIN] at this step, if necessary.

u Push [TRANSMIT] or release [PTT] (microphone) to

return to receive.

Convenient functions for receive

• Preamp and attenuator (p. 48)

➥ Push [P.AMP/ATT] several times to set the pre-

amp OFF, preamp 1 ON or preamp 2 ON.

•“P.AMP1,” “P.AMP2” or “P.AMP” appears when the

preamp 1, preamp 2 or preamp is set to ON, respectively. (depending on operating frequency band)

➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator

ON.

•Push [P.AMP/ATT] momentarily to turn the attenuator OFF.

•“ATT” appears when the attenuator is set to ON.

• Noise blanker (p. 51) ➥ Push [NB] to turn the noise blanker ON and OFF.

•“NB” appears when the noise blanker is set to ON.

• Push [NB] for 1 sec. to enter noise blanker set mode.

Convenient functions for transmit

• Speech compressor (p. 58)

➥ While M1 is selected with [MENU], push [F3

CMP] to turn the speech compressor ON and

OFF.

•“COMP” appears when the speech compressor is set to ON.

• VOX (voice operated transmit) (p. 55) ➥ Push [VOX/BK-IN] to turn the VOX function ON

and OFF.

•“VOX” appears when the VOX function is set to ON.

• Noise reduction (p. 53)

➥

Push [NR] to turn the noise reduction ON and OFF.

•Rotate [NR] control to adjust the noise reduction level.

•“NR” appears when the noise reduction is set to ON.

• Auto notch ﬁlter (p. 53)

➥ Push [A/NOTCH] to turn the auto or manual

notch ﬁlter ON and OFF.

•Rotate [NOTCH] control to set the attenuating frequency for manual notch operation.

• VSC (voice squelch control) (p. 54) ➥ While M2 is selected with [MENU], push

[F5 VSC] to turn the VSC function ON and OFF.

•The VSC indicator appears when the voice squelch function is set to ON.

• Transmit quality monitor (p. 57) ➥ Push [MONITOR] to turn the monitor function ON

and OFF.

•“MONI” appears when the monitor function is set to ON.

• Audio tone control (p. 89)

➥ While M2 is selected with [MENU], push [F4

TCN], select an item with [F1 ≤] and [F2 ≥] then

rotate the tuning dial to adjust the audio tone.

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

AGC DUP CMP TON SCP

TON

SCN

88.5Hz

TSQL Tone

Push [F4] for 1 sec.

Tone squelch operation

Tone squelch operation is a method of communications using selective calling. Only received signals having a matching tone will open the squelch. Before communicating using tone squelch, all members of your party must agree on the tone squelch frequency to use.

q Push [AM/FM] to select FM mode. w Push [MENU] several times to select M1. e Push [F4 TON] several times to turn the tone

squelch function ON.

•“TSQL” appears

r Push [F4 TONE] for 1 sec. to enter tone frequency

set mode.

t Push [F1 TON] several times until TSQL Tone

appears, if necessary.

y Rotate the tuning dial to select the desired tone

squelch frequency.

• Push [F3] for 1 sec. to select the default frequency.

u Push [MENU] to return to M1. i Communicate in the usual manner.

RECEIVE AND TRANSMIT

• Available tone squelch frequencies (Unit: Hz)

254.1

210.7

186.2

165.5

136.5

107.2

085.4

67.0

218.1

189.9

167.9

141.3

110.9

088.5

69.3

225.7

192.8

171.3

146.2

114.8

091.5

71.9

229.1

196.6

173.8

151.4

118.8

094.8

74.4

233.6

199.5

177.3

156.7

123.0

097.4

77.0

241.8

203.5

179.9

159.8

127.3

100.0

79.7

250.3

206.5

183.5

162.2

131.8

103.5

82.5

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

AGC DUP CMP TON SCP

TON

SCN

O23-NN

DTCS Code

Push [F4] for 1 sec.

Push [F5] to select the polarity

Select a code with the tuning dial.

RECEIVE AND TRANSMIT

DTCS operation

DTCS function is an another method of communications using selective calling. Only received signals having a matching 3-digit code will open the squelch.

q Push [AM/FM] to select FM mode. w Push [MENU] several times to select M1. e Push [F4 TON] several times to turn the DTCS

function ON.

•“DTCS” appears

r Push [F4 TON] for 1 sec. to enter tone frequency

set mode.

t Push [F1 TON] several times until DTCS Code

appears, if necessary.

y Rotate the tuning dial to select the desired DTCS

code number and push [F5] to select the desired code polarity.

NN : Normal polarity is used for both transmit and

receive.

NR : Normal polarity is used for transmit, reversed

polarity is used for receive.

RN : Reversed polarity is used for transmit, normal

polarity is used for receive.

RR : Reversed polarity is used for both transmit

and receive.

•Push [F3] for 1 sec. to select the default code and polarity.

u Push [MENU] to return to M1. i Communicate in the usual manner.

• Available tone codes

412

311

244

152

072

023

413

315

245

155

073

025

423

325

246

156

074

026

431

331

251

162

114

031

432

332

252

165

115

032

445

343

255

172

116

036

446

346

261

174

122

043

452

351

263

205

125

047

454

356

265

212

131

051

455

364

266

223

132

053

462

365

271

225

134

054

464

371

274

226

143

065

465

411

306

243

145

071

466 503 506 516 523 526 532 546 565 606 612 624 627

631 632 654 662 664 703 712 723 731 732 734 743 754

■ Repeater operation

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

AGC DUP CMP TON SCP

AGC

DUP CMP TON SCP

145.O8OOO

Push [F2], [F4]

Appears

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

AGC DUP CMP TON SCP

AGC

DUP CMP TON SCP

145.O8OOO

Push [F2] for 1 sec.

Appears

A repeater ampliﬁes received signals and retransmits them at a different frequency. When using a repeater, the transmit frequency is shifted from the receive frequency by an offset frequency. A repeater can be accessed using split frequency operation with the shift frequency set to the repeater’s offset frequency.

q Push a band key to select the desired band. w Push [A/B] to select VFO A. e Push [AM/FM] to select FM.

• Pushing [AM/FM] toggles between AM and FM.

r Rotate the tuning dial to set the repeater transmit

frequency.

t While M1 is selected, push [F2 DUP] several times

to set the offset direction.

•“DUP–” or “DUP+” appears

•0.100 MHz for HF, 0.500 MHz for 50 MHz and

0.600 MHz for 144 MHz band is set by default in set mode. (p. 83)

y Push [F4 TON] to turn the repeater tone ON.

•“T” appears.

•Set the tone frequency in tone frequency set mode in

advance, if desired. (p. 45) 88.5 Hz is set by default.

To transmit a 1750 Hz European repeater tone, push [F4 TON] while transmitting.

u Communicate in the normal way.

RECEIVE AND TRANSMIT

One-touch repeater function

This function allows you to set repeater operation with push of one switch.

➥ To set the transceiver for repeater operation using

the one-touch repeater function, follow the steps q to r as above, then push [F2 DUP] for 1 sec.

Set the offset shift direction and frequency in advance (p. 83) as well as the tone frequency (see p. 45).

AGC DUP CMP TON SCP

-6OO.Ok

[XFC]

[AM/FM] [SPLIT] [A/B] [M-CH]

[MW]

[V/M]

RECEIVE AND TRANSMIT

Transmit frequency monitor check

You may be able to receive the other party’s transmit signal directly without having to go through a repeater. This function allows you to check this.

➥ While receiving, push and hold [XFC] to see if you

can receive the other party’s transmit signal directly.

•While holding [XFC], the offset direction and frequency are displayed on the multi-function switch indicator.

Repeater tone frequencies

The transceiver’s repeater tone frequency is set to

88.5 Hz by default. This can be changed if desired.

q While M1 is selected, push [F4 TON] to turn the

tone encoder ON.

•“T” appears.

w Push [F4 TON] for 1 sec. to select the tone fre-

quency set mode.

e Push [F1 TON] several times to select Rptr

Tone, if necessary.

r Rotate the tuning dial to select the desired fre-

quency. (see the table at right)

t Push [MENU] to return to M1.

Rptr Tone

TON SCN

88.5Hz

• Available tone frequencies (Unit: Hz)

254.1

210.7

186.2

165.5

136.5

107.2

085.4

67.0

218.1

189.9

167.9

141.3

110.9

088.5

69.3

225.7

192.8

171.3

146.2

114.8

091.5

71.9

229.1

196.6

173.8

151.4

118.8

094.8

74.4

233.6

199.5

177.3

156.7

123.0

097.4

77.0

241.8

203.5

179.9

159.8

127.3

100.0

79.7

250.3

206.5

183.5

162.2

131.8

103.5

82.5

Storing a non standard repeater

q Turn the auto repeater function OFF in the set

mode. (p. 84)

w Push [AM/FM] to select FM mode. e Push [V/M], then [A/B] to select VFO A. r Rotate the tuning dial to set the repeater output fre-

quency.

• Set the tuning step if desired.

t Push [A/B] to select VFO B. y Rotate the tuning dial to set the repeater input fre-

quency.

u Push [A/B] to select VFO A. i Push [SPLIT] to turn the split function ON. o Push [F4 TON] to turn the previously set tone en-

coder ON.

!0 Rotate [M-CH] to select the desired memory chan-

nel.

•“BLANK” appears when a blank channel is selected.

!1 Push [MW] for 1 sec. to store the contents in the se-

lected memory channel.

Auto repeater function

This function automatically activates the repeater settings (DUP– or DUP+ and/or tone encoder ON/OFF) when the operating frequency falls within the general repeater output frequency range and deactivates them when outside of the range.

Set the auto repeater function ON-1 or ON-2 in set mode in advance (p. 84). When set ON-1 or ON-2, repeater settings are automatically activated according to the table below.

ON-1 automatically sets the duplex setting and ON-2 automatically sets the duplex setting and tone encoder automatically.

• Frequency range and offset direction

FREQUENCY RANGE DUPLEX DIRECTION

145.200–145.495 MHz minus duplex

146.610–146.995 MHz minus duplex

147.000–147.395 MHz plus duplex

RECEIVE AND TRANSMIT

Auto Repeater

ON-1

ON-2

OFF

“ ” or “ ”

0.5k

STEP

Sweep indicator Band scope indicator Frequency indicator mark Sweep step indicator

“ ” or “ ”

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

Sweep step selectionSweep start/stop

O.5k

STEP

O.5k

STEP

Sweep indicator

FUNCTIONS FOR RECEIVE

■ Simple band scope

The band scope function allows you to visually check signal conditions around a speciﬁed frequency. The IC746PRO’s band scope function can be used in any operating mode and frequency band.

INDICATOR

Sweep

Band scope in-

dicator

Frequency

indicator mark

Sweep step

The band scope measures receive signal conditions over a speciﬁed range on either side of a selected fre- quency in either VFO or memory modes.

q Rotate the tuning dial to tune a frequency. w While M1 is selected, push [F5 SCP] to select the

band scope menu.

•Starts sweeping automatically with the previously selected sweeping step.

• During sweep, received signals cannot be heard.

e Push [F5 STEP] several times to select the desired

sweep step.

r Push [F1] to start sweeping, then stop automatically

after sweeping.

•Push [F1] for 1 sec. to start continuous sweeping. In this case, it is necessary to push [F1] to stop sweeping.

•During sweep operation “” appears and received signals cannot be heard.

•If there is a lot of signal noise, turn the preamp OFF and the attenuator ON to reduce the signal input level and improve the readability of the band scope.

t When rotating the tuning dial and you ﬁnding a sig-

nal you wish to communicate on, then just communicate in the normal way.

•If you want to return to the previous frequency (before rotating the tuning dial), push [F3] for 1 sec.

y While receiving, if you want to update the band con-

•If the selected frequency is set outside of the sweeped range, ﬂashes.

ditions, repeat steps e and r as above.

DESCRIPTION

While the band scope is “sweeping,” “” appears; while stopped “” appears. Received audio is not emitted from the speaker while the band scope is “sweeping.”

Indicates the relative strength of signals and their location in relation to the center (displayed) frequency. Signal strength is relative to the S-meter level, S1 to S9, with each vertical dot in the band scope indicator equal to one segment of the S-meter. Signal activity is measured ±30 steps from the center frequency with each step equal to the selected sweep step.

After a sweep, indicates the relative position of the selected frequency. When the selected frequency is outside of the sweep range, indicator flashes. After changing the frequency, push [F3] for 1 sec. to automatically return to the center frequency.

Indicates the selected sweep step. 0.5, 1, 2, 5, 10, 20 and 25 kHz are selectable. Each dot of the band scope indication is approx. equal to the selected sweep step.

■ Preamp/Attenuator

[P.AMP/ATT]

Push

P.AMP/ATT

Push

P.AMP/ATT

Push

P.AMP/ATT

Push for 1sec.

P.AMP/ATT

Push

P.AMP/ATT

The preamp ampliﬁes received signals in the front end circuit to improve the S/N ratio and sensitivity. Set this to preamp 1 or preamp 2 when receiving weak signals. The attenuator prevents a desired signal from distortion when very strong signals are near the desired frequency or when very strong electric fields, such as from broadcasting stations, are near your location. These can both set independently for each band.

➥ Push [P.AMP/ATT] several times to set the preamp

OFF, preamp 1 ON or preamp 2 ON.

•When the preamp is ON, either “P.AMP 1” or “P.AMP 2” appears in the function display.

•When operating on the 144 MHz band, the preamp can

only be set to ON or OFF only— there is no preamp 1 and preamp 2.

Regular preamp, the most effective for 1.8 to 21 MHz bands without IMD corruption.

FUNCTIONS FOR RECEIVE

High-gain preamp, the most effective for 24 to 50 MHz bands.

Preamp activates for the VHF band

146 MHz range; 108 to 174 for the USA version)

➥

Push [P.AMP/ATT] for 1 sec. to set the attenuator ON.

•

“ATT ” appears in the display when the function is set ON.

•Push [P.AMP/ATT] momentarily to set the attenuator OFF.

Regarding the use of the “P.AMP 2”

The “P.AMP 2” is a high gain receive ampliﬁer. When the “P.AMP 2” is used during times of strong electric ﬁelds, dis-

tortion sometimes results. In such cases, use the transceiver with the “P.AMP 1” or “P.AMP OFF” setting.

(144 to

■ RIT function

The RIT (Receive Increment Tuning) function compensates for off-frequencies of the communicating station. The function shifts the receive frequency up to ±9.99 kHz in 10 Hz steps without moving the transmit frequency.

• See #0 on p. 4 for function description.

The “P.AMP 2” is most effective when:

•Used on bands above 24 MHz and when electric ﬁelds are weak.

•Receive sensitivity is insufﬁcient during low gain, or while using a narrow band antenna

age antenna or a short Yagi antenna, etc.) is used.

(such as small loop, a Bever-

[CLEAR]

q Push [RIT] to turn the RIT function ON and OFF.

•“RIT” and the shifting frequency appear when the func- tion is ON.

w Rotate the [RIT/∂TX] control.

•Push [CLEAR] for 1 sec. to reset the RIT frequency.

•Push [CLEAR] momentarily to reset the RIT frequency

when the quick RIT clear function is ON. (p. 86)

•Push [RIT] for 1 sec. to add the shift frequency to the operating frequency.

RIT monitor function

When the RIT function is ON, pushing and holding [XFC] allows you to monitor the operating frequency directly (RIT is temporarily cancelled).

Appears

[RIT]

[RIT/∂TX] control

FUNCTIONS FOR RECEIVE

■ AGC function

The AGC (auto gain control) controls receiver gain to produce a constant audio output level even when the received signal strength is varied by fading, etc.

The transceiver has 3 AGC characteristics (time constant; fast, mid, slow) for non-FM modes.

The FM mode AGC time constant is ﬁxed as ‘FAST’ (0.1 sec.) and AGC time constant cannot be selected.

AGC speed selection

q Select a non-FM mode. w While M1 is selected, push [F1 AGC] several times

to select AGC F, AGC M, AGC S or AGC OFF.

“AGC OFF” appears when AGC time constant OFF is set with one of FAST, MID or SLOW setting in AGC set mode.

[F1 AGC] Mode switches

: Medium AGC speed

: Slow AGC speed

: Fast AGC speed

: AGC is not activated

Setting the AGC time constant

q Select the desired mode other than FM mode. w While M1 is selected, push [F1 AGC] for 1 sec. to

enter AGC set mode.

e Push one of [F2

FAST

], [F3

MID

] or [F4

SLOW

] to se-

lect the desired AGC speed to be set.

•An underline appears below the time constant indication.

r Rotate the tuning dial to set the desired time con-

stant.

•AGC time constant can be set between 0.1 to 8.0 sec. (depends on mode) or turned OFF.

•Push [F2

FAST

], [F3

MID

] or [F4

SLOW

] for 1 sec. to select a default value each for fast, mid. and slow, respectively.

t Select another mode other than FM. Repeat steps

e and r if desired.

y Push [MENU] to exit the AGC set mode.

• Selectable AGC time constant (unit: sec.)

Mode Default Selectable AGC time constant

0.3 (FAST)

SSB 2.0 (MID)

6.0 (SLOW)

0.1 (FAST)

CW 0.5 (MID)

1.2 (SLOW)

0.1 (FAST)

RTTY 0.5 (MID)

1.2 (SLOW)

3.0 (FAST)

AM 5.0 (MID)

7.0 (SLOW)

FM 0.1 (FAST) Fixed

OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6

2.0, 2.5, 3.0, 4.0, 5.0, 6.0

OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6

2.0, 2.5, 3.0, 4.0, 5.0, 6.0

OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6

2.0, 2.5, 3.0, 4.0, 5.0, 6.0

OFF, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5

3.0, 4.0, 5.0, 6.0, 7.0, 8.0

AGC DUP CMP TBW SCP

F 1

speed’s time constant indication.

• When AGC fast is selected

F 1

Push [F2] for 1 sec. to select the default value in this case.

F 2 F 3 F 4 F 5

Push [F1] for 1 sec.

F 2F 3

F 2 F 3

F 4

F 5

Selected modeAppears under the selected AGC

F 4

F 5

■ IF ﬁlter selection

AGC DUP CMP TBW SCP

[FILTER]

The selected filter width is indicated for approx. 1 sec. when [FILTER] is pushed.

Filter selection

• Filter set mode indication

Shows the selected filter and passband width.

• Indication while setting

While pushing [F1 BW], rotate the tuning dial to set passband width.

Reverses Appears

The transceiver has 3 passband width IF filters for each mode.

For SSB and CW modes, the passband width can be set within 50 to 3600 Hz in 50 or 100 Hz steps. A total of 41 passband widths are available.

For RTTY mode, the passband width can be set within 50 to 2700 Hz in 50 or 100 Hz steps. A total of 32 passband widths are available.

For AM and FM modes, the passband width is fixed and 3 passband widths are available independently.

The filter selection is automatically memorized in each mode.

The PBT shift frequencies are automatically memorized in each ﬁlter.

FUNCTIONS FOR RECEIVE

IF ﬁlter selection

q Select the desired mode. w For RTTY mode, turn OFF the RTTY ﬁlter. e Push [FILTER] several times to select the IF filter

1, 2 or 3.

•The selected passband width and filter number is displayed in the LCD.

By pushing [PBTC], the set filter passband width, “B,” and shifting value “S” is indicated.

Filter passband width setting (SSB, CW and RTTY mode only)

q Select SSB, CW or RTTY mode.

•Passband widths for AM and FM modes are fixed and cannot be set.

w For RTTY mode, turn OFF the RTTY ﬁlter. e Push [FILTER] for 1 sec. to enter ﬁlter set mode. r Push [FILTER] several times to select the desired

IF ﬁlter number.

t While pushing [F1 BW], rotate the tuning dial to set

the desired passband width.

•In SSB and CW modes, the passband width can be set within the following range.

50 to 500 Hz 50 Hz steps 600 to 3600 Hz 100 Hz steps

•In RTTY mode, the passband width can be set within the following range.

50 to 500 Hz 50 Hz steps 600 to 2700 Hz 100 Hz steps

• Push [F-3] for 1 sec. to select the default value.

y Repeat steps r to t if desired. u Push [MENU] to exit the ﬁlter set mode.

The PBT shift frequencies are cleared when the passband width is changed.

This ﬁlter set mode screen graphically displays the PBT shift frequencies and CW pitch operations.

[NB]

NB Level

5O%

Shows noise blanker level

“NB” appears while noise blanker is activated.

Push [F5]

Meter Peak Hold

Shows peak level for approx. 0.5 sec.

FUNCTIONS FOR RECEIVE

■ IF (DSP) ﬁlter shape

The type of IF (DSP) ﬁlter shape for SSB and CW can be selected independently from soft and sharp.

q Push [SSB] or [CW/RTTY] to select SSB, CW or

RTTY mode.

w Select the ﬁlter set mode.

• Push [FILTER] for 1 sec.

• Operating mode can be selected in this step.

e Push [FILTER] several times to select the desired

IF ﬁlter.

r Push the [F5] to select the ﬁlter shape from “

and “

SHARP

.”

t Push [MENU] to exit the set mode.

SOFT

”

■ Noise blanker

The noise blanker eliminates pulse-type noise such as from car ignitions. The noise blanker is not available for FM mode.

q Push [NB] to turn the noise blanker ON.

• [NB] indicator appears.

w Push [NB] for 1 sec. to enter the NB level set mode. e Rotate the tuning dial to adjust the noise blanker

level.

•Noise blanker level is indicated with bar meter and digit in ‘%.’

r Push [NB] to exit the noise blanker set mode. t Push [NB] to turn the noise blanker OFF.

• [NB] indicator disappears.

When using the noise blanker, received signals may be distorted if the noise blanker level setting has been too high.

■ Meter peak hold function

The S-meter has a peak level holding function. The peak level of the received signal strength is indicated for 0.5 sec. (approx.). This function can be deactivated in set mode if desired. (p. 82)

■ Twin PBT operation

FUNCTIONS FOR RECEIVE

General PBT (Passband Tuning) function electronically narrows the IF passband width by shifting the IF frequency to slightly outside of the IF ﬁlter passband to reject interference. This transceiver uses the DSP circuit for the PBT function. Moving both [TWIN PBT] controls to the same position shifts the IF.

➥ The LCD shows the passband width and shift fre-

quency graphically.

➥ Push [FILTER] for 1 sec. to enter the ﬁlter set mode.

Current passband width and shift frequency is displayed in the ﬁlter set mode screen.

➥ To set the [TWIN PBT] controls to the center posi-

tions, push [PBTC] for 1 sec.

The variable range depends on the passband width and mode. The edge of the variable range is half of the passband width, and PBT is adjustable in 25 or 50 Hz steps. These controls function as an IF shift control while in AM mode and when the RTTY ﬁlter is turned ON. Only the inner control may function in this case. IF shift is adjustable in 20/40 Hz steps in RTTY (RTTY

ﬁlter is turned ON) or 150/300/500 Hz steps in AM.

•

[TWIN PBT] should normally be set to the center positions (PBT setting is cleared) when there is no interference.

NOTE: In the “center” PBT position on CW, it is normal

for the graphic display’s center line to be slightly to the left side of PBT envelope, if a CW filter selection of 800 Hz or above is selected.

•When PBT is used, the audio tone may be changed.

• Not available for FM mode.

•For AM and RTTY (with RTTY filter ON) modes,

[TWIN PBT] inner control only can be activated, and functions as an IF shift function.

•While rotating [TWIN PBT], noise may occur. This comes from the DSP unit and does not indicate an equipment malfunction.

•

By pushing [PBTC] momentarily indicates the passband width, “B,” and shifting value, “S” of the ﬁlter being used.

[TWIN PBT] control

[PBTC]

AGC DUP CMP TBW SCP

Passband width and shifting value are indicated while [TWIN PBT] is operated.

Appears when PBT is used.

• Filter set mode indication

Shows the selected filter and passband width.

• Indication while PBT setting

Appears when passband is shifted.

*By pushing [PBTC] for 1 sec., the shifted value returns to the default setting, and the “dot” disappears.

PBT OPERATION EXAMPLE

Center

IF center frequency

interference

Passband

desired signal

pass band

inteference

Passband

desired signal

IF shift

IF center freq.

interference

AGC DUP CMP TBW SCP

[A/NOTCH] [NOTCH]

Notch function indicators

AGC DUP CMP TBW SCP

[NR] [NR]

Appears

[LOCK/SPCH]

Lights while the dial lock function is activated.

FUNCTIONS FOR RECEIVE

■ Noise reduction

The noise reduction function reduces noise components and picks out desired signals which are buried in noise. The received signals are converted to digital signals and then the desired signals are separated from the noise.

q Push the [NR] switch to turn the noise reduction

ON.

•“NR” appears.

w Rotate the [NR] control to adjust the noise reduction

level.

e Push the [NR] switch to turn the noise reduction

OFF.

•“NR” disappears.

Deep rotation of the [NR] control results in audio signal masking or distortion. Set the [NR] control for maximum readability.

■ Notch function

This transceiver has auto and manual notch functions. The auto notch function automatically attenuates more than 3 beat tones, tuning signals, etc., even if they are moving. The manual notch can be set to attenuate a frequency via the [NOTCH] control.

➥ Push [A/NOTCH] to toggle the notch function be-

tween auto, manual and OFF in SSB and AM modes.

➥ Push [A/NOTCH] to turn the manual notch function

ON and OFF in CW mode.

➥ Push [A/NOTCH] to turn the auto notch function ON

and OFF in FM mode.

•Set to attenuate a frequency for manual notch via the [NOTCH] control.

•“ANOTCH” appears when auto notch is in use.

•“NOTCH” appears when manual notch is in use.

While operating the manual notch, noise may be heard. This comes from the DSP unit and does not indicate an equipment malfunction.

■ Dial lock function

The dial lock function prevents accidental changes caused by the tuning dial.

➥ Push [LOCK/SPCH] to turn the dial lock function ON

and OFF.

•“LOCK” indicator lights while the dial lock function is ac- tivated.

■ Voice squelch control function

F 1

F 2 F 3 F 4 F 5

SCN MEM SWR TCN VSC

Push [F5] to turn the VSC function ON and OFF.

VSC indicator

This function is useful when you don’t want unmodulated signals. When the voice squelch control function is activated, the receiver checks received signals for voice components.

If a receiver signal includes voice components, and the tone of the voice components changes within 1 sec., squelch opens. If the received signal includes no voice components or the tone of the voice components does not change within 1 sec., squelch closes.

➥ While M2 is selected with [MENU], push [F5 VSC]

to switch the VSC (Voice Squelch Control) function ON and OFF.

•“VSC” appears when the function is activated.

•The VSC function activates for phone modes

(SSB, AM and FM).

•The VSC function can also be used for scanning operation in AM or FM mode (p. 70).

FUNCTIONS FOR RECEIVE

AGC DUP CMP TBW SCP

[VOX/BK-IN]

Appears

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

VOX Gain

5O%

Shows VOX gain level

Anti-VOX

5O%

Shows anti-VOX gain level

VOX Delay

O.2s

Shows VOX delay time

FUNCTIONS FOR TRANSMIT

■ VOX function

The VOX (Voice-Operated Transmission) function switches between transmit and receive with your voice. This function provides an opportunity to input log entries into your computer, etc., while operating.

• Using the VOX function

q Select a phone mode (SSB, AM, FM). w Push [VOX/BK-IN] to turn the VOX function ON or

OFF.

Adjusting the VOX function

q Select a phone mode (SSB, AM, FM). w Push [VOX/BK-IN] to turn VOX function ON. e Push [VOX/BK-IN] for 1 sec. to enter VOX set

mode.

r Select the VOX Gain item using [F1 ≤] or [F2 ≥]. t While speaking into the microphone, rotate the tun-

ing dial to the point where the transceiver is continuously transmitting.

- Push [F3] for 1 sec. to select the default value.

y Push [F2 ≥] to select Anti-VOX item. u While receiving, rotate the tuning dial to the point

where the transceiver does not switch to transmit with the speaker output.

- Push [F3] for 1 sec. to select the default value.

i Push [F2 ≥] to select VOX Delay item. o Adjust the VOX delay for a convenient interval be-

fore returning to receive.

- Select the VOX delay item using the tuning dial.

- Push [F3] to select the default value.

!0 Push [MENU] to return to previous indication.

■ Break-in function

[VOX/BK-IN]

Break-IN Delay

Break-in indicator

Shows break-in delay time

7.5d

AGC DUP 1/4 KEY SCP

Full break-in indicator

The break-in function is used in CW mode to automatically toggle the transceiver between transmit and receive when keying. The IC-746PRO is capable for full break-in or semi break-in.

Semi break-in operation

During semi break-in operation, the transceiver selects transmit when keying, then automatically returns to receive after a pre-set time from when you stop keying.

q Push [CW/RTTY] to select CW or CW-R mode. w Push [VOX/BK-IN] several times to turn the semi

break-in function ON.

•“BK-IN” appears.

e Set the break-in delay time (the delay from transmit

to receive). ➥ Push [VOX/BK-IN] for 1 sec. to select break-in

delay program mode.

➥ Rotate the tuning dial to select the desired delay.

• Push [F3] for 1 sec. to select to the default value.

r Push [MENU] to return to the previous menu.

FUNCTIONS FOR TRANSMIT

When using a paddle, rotate [KEY SPEED] to adjust the keying speed.

Full break-in operation

During full break-in operation, the transceiver automatically selects transmit while keying and returns to receive immediately after keying is ﬁnished.

q Push [CW/RTTY] to select CW or CW-R mode. w Push [VOX/BK-IN] several times to turn the full

break-in function ON.

•“FBK-IN” appears.

When using a paddle, rotate [KEY SPEED] to adjust the keying speed.

[∂TX]

[CLEAR]

[RIT/∂TX] control

Appears

[MONITOR]

MONITOR Level

Monitor indicator

Shows monitor level

5O%

FUNCTIONS FOR TRANSMIT

■∂∂TX function

The ∂TX function shifts the transmit frequency up to ±9.99 kHz in 10 Hz steps without moving the receive frequency.

• See #2 on p. 4 for function description.

q Push the [∂TX] switch to turn the ∂TX function ON

and OFF.

•“∂TX” and shift frequency appear when the function is ON.

w Rotate the [RIT/∂TX] control.

• To reset the ∂TX frequency, push [CLEAR] for 1 sec.

•Push [CLEAR] momentarily to reset the ∂TX frequency

when the quick RIT clear function is ON. (p. 86)

•To add or subtract the ∂TX frequency to the displayed frequency, push [∂TX] for 1 sec.

When RIT and ∂TX are ON at the same time, the [RIT/∂TX] control shifts both the transmit and receive frequencies from the displayed frequency at the same time.

DD ∂∂

TX monitor function

When the ∂TX function is ON, pushing and holding [XFC] allows you to monitor the operating frequency directly (∂TX is temporarily cancelled).

■ Monitor function

The monitor function allows you to monitor your transmit IF signals in any mode through the speaker. Use this to check voice characteristics while adjusting SSB transmit tones. (p. 89) The CW sidetone functions regardless of the [MONITOR] switch setting.

q Push [MONITOR] to switch the monitor function ON

and OFF.

•“MONI” appears when the monitor function is ON.

w Set the monitor level.

➥ Push [MONITOR] for 1 sec. to select monitor pro-

gram mode.

➥ Rotate the tuning dial for the clearest audio out-

put while pushing [PTT] and speaking into the microphone.

• Push [F3] for 1 sec. to select the default value.

e Push [MENU] to return to the previous menu.

■ Speech compressor

COMP Level

Compressor indicator

Shows compression level

COMP level zone

*The SWR meter functions as the COMP meter when COMP meter is set to ON in the set mode.

COMP meter

ALC meter

Adjust the COMP Level with the tuning dial so that the COMP meter does not exceed the COMP level zone.

Adjust [MIC GAIN], so that the COMP meter does not exceed this zone.

F 1

F 2F 3

F 4

F 5

F 1

F 2 F 3 F 4 F 5

AGC DUP CMP TBW SCP

BW=WIDE

Push [F4]

Push [F4] for 1 sec. to select the transmit filter width.

The selected transmit filter width is displayed for approx. 1 sec.

The speech compressor increases average RF output power, improving signal strength and readability in SSB, AM or FM. When adjusting the compression level, it is necessary to turn the COMP meter ON in the set mode, in advance (p. 82).

• In SSB mode

q Select USB or LSB mode and adjust [MIC GAIN] to

a suitable level.

w While M1 is selected, push [F3 CMP] to turn the

speech compressor ON.

•“COMP” appears.

e Push [F3 CMP] for 1 sec. to select compression

level set mode.

r While speaking into the microphone, rotate the tun-

ing dial, so that the COMP meter reads within the COMP zone with your normal voice level.

• Push [F3] for 1 sec. to select the default value.

When the COMP meter peaks above the COMP zone, your transmitted voice may be distorted.

t Push [MENU] to return to M1.

FUNCTIONS FOR TRANSMIT

• In AM/FM mode

q While M1 is selected, push [F3 CMP] to turn the

speech compressor ON.

•“COMP” appears.

w Push [F3 CMP] for 1 sec. and set the compression

level as “1” in advance.

e While speaking into the microphone, rotate [MIC

GAIN], so that the COMP meter does not exceed the center dot whether you speak softly or loudly.

r While speaking into the microphone, rotate the tun-

ing dial, so that the COMP meter reads within the COMP zone with your normal voice level.

• Push [F3] for 1 sec. to select the default value.

When the COMP meter peaks above the COMP zone, your transmitted voice may be distorted.

t Push [MENU] to return to M1.

■

Transmit ﬁlter width selection

The transmit ﬁlter width for SSB mode can be selected from wide, middle and narrow.

q Select USB or LSB mode. w Push [MENU] to select M1, if necessary. e Push [F4 TBW] for 1 sec. to select the transmission

passband width.

•One of “TX BW=WIDE,” “TX BW=MID” or “TX BW=NAR” is displayed for approx. 1 sec.

• Transmit ﬁlter width: NAR 2.2 kHz

MID 2.4 kHz WIDE 2.8 kHz

(SSB mode only)

Tuning dial[XFC]

[SPLIT] Lights during split operation

[A/B]

AppearsShows transmit (VFO B) frequency

AGC DUP CMP TBW SCP

21.29OOO

Shows transmit (VFO B) frequency

Shows shift frequency and direction

AGC DUP CMP TBW SCP

+2O.OOk

• While pushing [XFC]

AGC DUP CMP TBW SCP

21.31OOO

• After setting up

FUNCTIONS FOR TRANSMIT

■ Split frequency operation

Split frequency operation allows you to transmit and receive in the same mode on two different frequencies. The split frequency operation is basically performed using 2 frequencies in VFO A and VFO B.

The following is an example of setting 21.290 MHz for receiving and 21.310 MHz for transmitting.

q Set 21.290 MHz (USB) in VFO A. w Push [SPLIT] to turn the split function ON, then

push [A/B] for 1 sec.

•The equalized transmit (VFO B) frequency and “SPLIT” appear on the LCD, and the [SPLIT] indicator lights.

e While pushing [XFC] rotate the tuning dial to set the

transmit frequency to 21.310 MHz.

•The transmit frequency can be monitored while pushing [XFC].

r Now you can receive on 21.290 MHz and transmit

on 21.310 MHz.

To change the transmit and receive frequencies, push [A/B] to exchange the VFO A and VFO B.

CONVENIENT

• Direct shift frequency input

The shift frequency can be entered directly.

q Push [F-INP]. w Enter the desired shift frequency with the digit

keys.

• 1 kHz to 1 MHz can be set.

•When you require a minus shift direction, push [GENE • ] in advance.

e Push [SPLIT].

•The shift frequency is input in the sub readout and the split function is turned ON.

[Example]

To transmit on 1 kHz higher frequency:

- Push [F-INP], [1.81] then [SPLIT].

To transmit on 3 kHz lower frequency:

- Push [F-INP], [GENE • ], [73] then [SPLIT].

• Split lock function

Accidentally releasing the [XFC] switch while rotating the tuning dial changes the receive frequency. To prevent this, use both the split lock and dial lock functions to change the transmit frequency only. The split lock function cancels the dial lock function while pushing [XFC] during split frequency operation.

The dial lock’s effectiveness during split frequency operation can be selected in the set mode for both receive and transmit frequencies; or only the receive frequency. (p. 83)

■ Quick split function

Shows shift frequency and direction

AGC DUP CMP TBW SCP

+2O.OOk

• Setting the frequency while pushing [XFC]

AGC DUP CMP TBW SCP

21.31OOO

+O.O2OMHz

SPLIT Offset

Shows transmit frequency for split operation

OFF

SPLIT LOCK

[XFC] Tuning dial [LOCK/SPCH]

When you push the [SPLIT] switch for 1 sec., split frequency operation is turned ON, the undisplayed VFO is automatically changed according to the plus/minus shift frequency programmed in set mode (p. 83) or equalized when 0 kHz (default value) is programmed as the split shift frequency. Quick split operation is turned ON by default but can be turned OFF in set mode (p. 83).

q Suppose you are operating at 21.290 MHz (USB) in

VFO A.

w Push [SPLIT] for 1 sec.

• Split frequency operation is turned ON.

•The VFO and VFO B are equalized.

e While pushing [XFC], rotate the tuning dial to set

the frequency offset between transmit and receive.

•When [XFC] is released, the receive frequency is indicated.

FUNCTIONS FOR TRANSMIT

Split offset frequency setting

By setting an often-used split frequency offset in advance, you can use the quick split function to select split operation at the push of one switch.

Set the split offset frequency in advance in set mode (p. 83, item 12). The example at right shows the split offset is set to +0.020 MHz.

➥ Push [SPLIT] for 1 sec. to activate the quick split

function.

•The transmit frequency is offset from the receive frequency according to the offset in set mode.

Split lock function

The split lock function is convenient for changing only the transmit frequency. When the split lock function is not used, accidentally releasing [XFC] while rotating the tuning dial, changes the receive frequency. The split lock function is ON by default, but can be turned OFF in set mode.

q While split frequency operation is ON, push

[LOCK/SPCH] to activate the split lock function.

w While pushing [XFC], rotate the tuning dial to

change the transmit frequency.

•If you accidentally release [XFC] while rotating the tuning dial, the receive frequency does NOT change.

AGC DUP 1/4 RTY SCP

The best match is in this range.

F 1

F 2F 3

F 4

F 5

F 1

F 2 F 3 F 4 F 5

SCN MEM SWR TCN VSC

1Ok

STEP

1Ok

STEP

Push [F3]

Push [F5] to select SWR measuring step.

Push [F3] to select number of SWR measuring steps.

Push [F1] to start measuring.

• Measuring (after pushing [F1])

Frequency marker appears and moves after measurement.

*When mesurement point/s is/are set outside of the oper-

atable frequency band, the frequency marker flashes.

Typical display SWR varying between 1 and 2, full scale up to SWR 4.0:1.

— 1.0:1

— 1.5:1

— 2.0:1

— 3.0:1

— 4.0:1

FUNCTIONS FOR TRANSMIT

■ Measuring SWR

The IC-746PRO has a built-in circuit for measuring antenna SWR— no external equipment or special adjustments are necessary.

The IC-746PRO can measure SWR in 2 ways— spot measurement and plot measurement are available.

Spot measurement

q Push [TUNER] to turn the antenna tuner OFF. w Turn the COMP meter OFF.

➥ Push [MENU] for 1 sec. to enter set mode. ➥ Push [F1 ≤] or [F2 ≥] several times to select the

COMP Meter item.

➥

Rotate the tuning dial to set the COMP meter OFF.

➥ Push [MENU] to exit set mode.

e Push [CW/RTTY] several times to select RTTY

mode.

r Push [TRANSMIT] or [PTT] on the microphone. t Rotate [RF PWR] clockwise past the 12 o’clock po-

sition for more than 30 W output power (30%).

y Read the SWR on the SWR meter. u Push [TRANSMIT] or release [PTT] to receive.

The built-in antenna tuner matches the transmitter to the antenna when the SWR is lower than 3:1.

Plot measurement

Plot measurement allows you to measure the SWR over an entire band.

q While M2 is selected with [MENU], push [F3 SWR].

• SWR graph screen appears.

w Rotate [RF PWR] clockwise past the 12 o’clock po-

sition for more than 30 W output power (30%).

e Set the center frequency for the SWR to be mea-

sured.

r Push [F5] for 1 sec. several times to select the de-

sired measuring step from 10, 50, 100 and 500 kHz.

t Push [F3] several times to select the desired num-

ber of measuring steps from 3, 5, 7, 9, 11 and 13 steps.

y Push [F1] to start the measuring. u Push [TRANSMIT] or push and hold [PTT] on the

microphone to measure the SWR.

• Frequency marker, “∫,” appears below SWR graph.

• RTTY mode is automatically selected.

i When pushing [TRANSMIT] again or releasing

[PTT], the frequency marker and frequency indication move to the next frequency to be measured.

o Repeat steps u and i to measure SWR over the

entire frequency range.

!0 When the measured SWR is less than 1.5:1, the

antenna is well matched with the transceiver in the measured frequency range.

■ Memory channels

[V/M] [M-CH]

Disappears when a channel is programmed.

• During VFO mode

• During memory mode

MEMORY OPERATION

The transceiver has 101 memory channels (plus 1 call channel). The memory mode is very useful for quickly changing to often-used frequencies.

MEMORY

CHANNEL

Regular memory

channels in each memory channel.

Scan edge

memory P1, P2 each memory channel as scan Yes Yes No

channels edges for programmed scan.

Call channel C Same as regular. No Yes No

MEMORY

CHANNEL CAPABILITY

NUMBER

1–99

One frequency and one mode

One frequency and one mode in

All 101 memory channels are tuneable which means the programmed frequency can be tuned temporarily with the tuning dial, etc. in memory mode.

TRANSFER OVER-

TO VFO WRITING

Yes Yes Yes

■ Memory channel selection

In VFO mode

q Push [V/M] to select VFO mode, if necessary, then

rotate [M-CH] to select a memory channel number.

•All memory channels including blank channels can be selected.

•“BLANK” appears when no information has been pro- grammed into a memory channel.

w Push [V/M] to select memory mode.

•“MEMO” and contents of the memory channel appear.

CLEAR

In memory mode

q Push [V/M] to select memory mode. w Rotate [M-CH] to select a memory channel.

•All memory channels including blank channels can be selected.

•Memory channels can also be selected using the microphone [UP]/[DN] keys.

[V/M] [M-CH]

[MW]

AGC DUP CMP TBW SCP

• [EXAMPLE]: Programming 7.088 MHz/LSB into memory channel 12.

AGC DUP CMP TBW SCP

• [EXAMPLE]: Programming 21.280 MHz/USB into memory channel 18.

[V/M] [M-CH]

[M-CL]

MEMORY OPERATION

■ Programming a memory

Memory channel programming can be preformed either in VFO mode or in memory mode.

Programming in VFO mode

q Set the desired frequency and operating mode in

VFO mode.

w Rotate [M-CH] to select the desired memory chan-

nel.

•“BLANK” appears if the selected memory channel is a blank channel (and does not have contents).

e Push [MW] for 1 sec. to program the displayed fre-

quency and operating mode into the memory channel.

•3 beeps are emitted when memory programming is successful.

Programming in VFO mode

q Select the desired memory channel with [M-CH] in

memory mode.

• Memory channel contents appear in the display.

•“BLANK” appears and no frequency readout is displayed

if the selected memory channel is a blank channel (and does not have contents).

w Set the desired frequency and operating mode in

memory mode.

•To program a blank channel, use direct frequency entry with the keypad or memo pads, etc.

e Push [MW] for 1 sec. to program the displayed fre-

quency and operating mode into the memory channel.

•3 beeps are emitted when memory programming is successful.

■ Memory clearing

Any unnecessary memory channels can be cleared. The cleared memory channels become blank channels.

q Select memory mode with [V/M]. w Select the desired memory channel with [M-CH]. e Push [M-CL] for 1 sec. to clear the contents.

•The programmed frequency and operating mode disappear.

•3 beeps are emitted when memory clearing is successful.

r To clear other memory channels, repeat steps w

and e.

■ Selecting the call channel

[CALL]

AGC DUP CMP TON SCP

“C” appears

[V/M] [M-CH]

[MW]

AGC DUP CMP TON SCP

By default 145.00000 MHz/FM is programmed into the call channel. However, this can be changed to suit your operating preference. (see below)

q Push [CALL] to select the call channel.

•“C” appears.

w Push [CALL] again to return to the previous mode.

MEMORY OPERATION

■

Programming the call channel

The call channel is programmed in the same way regular memory channels are. It’s convenient to program a most-often-used frequency into the call channel for quick recall. As with memory channels, the call channel can also hold split frequencies.

q Rotate [M-CH] to select the call channel.

•“C” appears.

w Select the desired frequency and operating mode

to program into the call channel.

e Push [MW] for 1 sec. to program the displayed fre-

quency and operating mode into the call channel.

•3 beeps are emitted when memory programming is successful.

IMPORTANT!: When the call channel is selected with the [CALL] switch, the frequency CANNOT be changed using the tuning dial, band keys or keypad input. However, when the call channel is selected using [M-CH] in memory mode, the frequency CAN be changed.

[V/M] [M-CH]

TRANSFERRING EXAMPLE IN VFO MODE

Operating frequency : 21.320 MHz/USB (VFO) Contents of M-ch 16 : 14.018 MHz/CW

Push [V/M] for 1 sec.

TRANSFERRING EXAMPLE IN MEMORY MODE

Operating frequency : 14.020 MHz/CW (M-ch 16) Contents of M-ch 16 : 14.018 MHz/CW

Set the frequency

Push [V/M] for 1 sec. then push [V/M]

MEMORY OPERATION

■ Frequency transferring

The contents of a memory channel (frequency, operating mode, etc.) can be transferred to the VFO.

Frequency transferring can be performed in either VFO mode or memory mode.

Transferring in VFO mode

This is useful for transferring programmed contents to VFO.

q Select VFO mode with [V/M]. w Select the memory channel to be transferred with

[M-CH].

•“BLANK” appears if the selected memory channel is a blank channel. In this case transferring is impossible.

e Push [V/M] for 1 sec. to transfer the frequency and

operating mode.

• 3 beeps are emitted.

Transferring in memory mode

This is useful for transferring frequency and operating mode while operating in memory mode.

When you have changed the frequency or operating mode in the selected memory channel:

• Displayed frequency and mode are transferred.

•Programmed frequency and mode in the memory

channel are not transferred, and they remain in the memory channel.

q Select the memory channel to be transferred with

[M-CH] in memory mode.

• And, set the frequency or operating mode if required.

w Push [V/M] for 1 sec. to transfer the frequency and

operating mode.

•3 beeps are emitted when the transferring is successful.

•Displayed frequency and operating mode are transferred

to the VFO.

e To return to VFO mode, push [V/M] momentarily.

■ Programming scan edges

[V/M]

Tuning dial

[M-CH]

[MW]

• After steps w to r

• After steps t to u

Memory channels P1 and P2 are the program scan edges. They are used to program an upper and lower frequency for programmed scan (p. 71). By default, P1 is programmed with 0.50000 MHz and P2 is programmed with 29.99999 MHz. If P1 and P2 are programmed with the same frequencies, programmed scan will not proceed.

[EXAMPLE]: Programming 14.00000 MHz into P1

and 14.35000 MHz into P2.

q Push [V/M] to select VFO mode, if necessary. w Rotate [M-CH] to select scan edge P1. e Rotate the tuning dial to set 14.00000 MHz as the

lower frequency.

r Push [MW] for 1 sec. to program 14.00000 MHz

into scan edge P1.

• 3 beeps are emitted.

t Rotate [M-CH] to select scan edge P2. y Rotate the tuning dial to set 14.35000 MHz as the

upper frequency.

u Push [MW] for 1 sec. to program 14.35000 MHz

into scan edge P2.

• 3 beeps are emitted.

•When programmed scan is activated (p. 71) scanning

will search the frequencies between 14.00000 MHz and

14.35000 MHz for signals.

MEMORY OPERATION

[V/M]

Tuning dial

[M-CH][MENU]

F 1

F 2F 3

F 4

F 5

F 1

F 2F 3

F 4

F 5

F 1

F 2F 3

F 4

F 5

F 1

F 2F 3

F 4

F 5

F 1

F 2 F 3 F 4 F 5

SCN MEM SWR TCN VSC

EDT

(

) SEL

14.195OO

USB

ABC

DEL SPC

Push [F2 MEM]

ABC

DEL SPC

• During assigning a memory name

abc

DEL SPC

spot

• After assigning a memory name

Input space

Delete a character

Move cursor forwards

Move cursor backwards

Selects character type

MEMORY OPERATION

■ Assigning memory names

All memory channels (including scan edges) can be tagged with alphanumeric names of up to 9 characters each.

[EXAMPLE]: Programming “DX spot” into memory

channel 99.

q Push [V/M] to select memory mode, if necessary. w Rotate [M-CH] to select memory channel 99. e Push [MENU] several times to select M2. r Push [F2 MEM] to select the memory name screen. t Push [F1 EDT] to edit memory channel name.

• A cursor appears and blinks.

•Memory channel names of blank channels cannot be

edited.

y Push [F1] several times to select the type of char-

acters for input.

•“ABC” inputs capital letters A to Z.

•“abc” inputs small letters a to z.

•“etc” is used to input other characters— ! # $ % & ¥ ? ” ’ ` ^ + – ✱ / . , : ; = < > ( ) [ ] { } | _ –are available.

•Use the keypad to directly input numerals, “0” to “9,” in-

cluding a decimal point.

u Rotate the tuning dial to select the ﬁrst character for

input.

i Push [F2 ç] or [F3 å] to move the cursor forwards

or backwards, respectively.

•Push [F5 SPC] to input a space and [F4 DEL] to delete the selected character.

o Repeat steps w to i to program another memory

!0 Push [MENU] to set the memory channel name and

channel’s name, if desired.

return to the memory name menu.

• Push [MENU] 1 more times to return to M2.

■ Memo pads

AGC DUP CMP TBW SCP

MP-W

Erased

In this example, pushing [MP-W] enters 21.28000 MHz USB into the top memo pad and erases the oldest memo pad (21.34724 MHz LSB).

• Displayed frequency and mode • Stored in next available memo pad

AGC DUP CMP TBW SCP

• VFO or memory mode • Memo pads

MP-R

The transceiver has a memo pad function to store frequency and operating mode for easy write and recall. The memo pads are separate from memory channels. The default number of memo pads is 5, however, this can be increased to 10 in set mode if desired. (p. 85)

Writing frequencies and operating modes into memo pads

➥ Push [MP-W] to store the displayed frequency and

operating mode into a memo pad.

•Each push of [MP-W] stores a frequency and mode into the next available memo pad; when you write a 6th (or 11th) frequency and operating mode, the oldest written frequency and operating mode are automatically erased to make room for the new settings.

MEMORY OPERATION

NOTE: Each memo pad must have its own unique combination of frequency and operating mode; memo pads having identical settings cannot be written.

Recalling a memo pad

➥ Push [MP-R] to recall a memo pad.

•Each push of [MP-R] recalls a memo pad, starting from the most recently written.

PROGRAMMED SCAN

Repeatedly scans between two scan edge frequencies (scan edge memory channels P1 and P2).

This scan operates in VFO mode.

SELECT MEMORY SCAN

Repeatedly scans all selected memory channels.

∂F SCAN

Repeatedly scans within ∂F span area.

This scan operates in memory mode.This scan operates in memory mode.

This scan operates in both VFO and memory modes.

Scan

Scan edge P1 or P2

Scan edge P2 or P1

Jump

Mch 1 Mch 5

Mch 2 Mch 3 Mch 4

Mch 6Mch 7Mch 99

MEMORY SCAN

Repeatedly scans all programmed memory channels.

Mch 1 Mch 5

Mch 2 Mch 3 Mch 4

Mch 6Mch 7Mch 99

SEL

SELSEL

SEL

SELSEL

SEL

ScanScan

–

∂F frequency +∂F frequency

Start frequency

Jump

SCANS

■ Scan types

■ Preparation

• Channels

For programmed scan:

Program scan edge frequencies into scan edge memory channels P1 and P2.

∂∂

F scan:

For

Set the ∂F span (∂F scan range) in the scan screen.

For memory scan:

Program 2 or more memory channels except scan edge memory channels.

For select memory scan:

Designate 2 or more memory channels as select memory channels. To designate the channel as a select memory channel, choose a memory channel, then push [F3 SEL] in the scan screen, or push [F5 SEL] in the memory name screen.

• Scan resume ON/OFF

You can select the scan to resume or cancel when detecting a signal, in set mode. Scan resume ON/OFF must be set before operating a scan. See p. 70 for ON/OFF setting and scan resume condition details.

• Scan speed

Scan speed can be selected from 2 levels, high or low, in set mode. See p. 70 for details.

• Squelch condition

SCAN

STARTS

WITH

SQUELCH

OPEN

SQUELCH

CLOSED

PROGRAMMED

SCAN

The scan continues until it is stopped manually, and does not pause even if it detects signals.

Scan stops when detecting a signal.

If you set scan resume ON in scan set mode, the scan pauses for 10 sec. when detecting a signal, then resumes. When a signal disappears while scan is paused, scan resumes 2 sec. later.

MEMORY SCAN

Scan pauses on each channel when the scan resume is ON; not applicable when OFF.

■ Voice squelch control function

F 1

F 2F 3

F 4

F 5

F 1

F 2 F 3 F 4 F 5

F 1

F 2F 3

F 4

F 5

F 1

F 2F 3

F 4

F 5

SCN MEM SWR TCN VSC

PRO

∂F

FIN SPN SET

∂

F:±1Ok

Push [F1]

Push [F5]

SCAN Speed

HIGH

Push [F1] or [F2]

SCAN Resume

F 1

F 2 F 3 F 4 F 5

SCN MEM SWR TCN VSC

Push [F5] to turn the VSC function ON and OFF.

VSC indicator

This function is useful when you don’t want unmodulated signals pausing or cancelling a scan. When the voice squelch control function is activated, the receiver checks received signals for voice components.

If a receiver signal includes voice components, and the tone of the voice components changes within 1 sec., scan pauses (or stops). If the received signal includes no voice components or the tone of the voice components does not change within 1 sec., scan resumes.

➥ While M2 is selected with [MENU], push [F5 VSC]

to switch the VSC (Voice Squelch Control) function ON and OFF.

•“VSC” appears when the function is activated.

• The VSC function activates for any scan.

•The VSC function resumes the scan on unmodu-

lated signals, regardless of whether the scan resume condition is set to ON or OFF.

SCANS

■ Scan set mode

When the squelch is open, scan continues until it is stopped manually— it does not pause on detected signals. When squelch is closed, scan stops when detecting a signal, then resumes according to the scan resume condition. Scan speed and the scan resume condition can be set using the scan set mode.

q Push[MENU] to select M2. w Push [F1 SCN] to select scan menu. e Push [F5 SET] to select scan set mode. r Push [F1 ≤] or [F2 ≥] to select SCAN Speed

item.

t Rotate the tuning dial to select scan speed from

high and low.

•“HIGH” : scan is faster

•“LOW” : scan is slower

y Push [F2 ≥] to select SCAN Resume item. u Rotate the tuning dial to select scan resume func-

tion from ON and OFF.

•“ON” : when detecting a signal, scan pauses for

10 sec., then resumes. When a signal disap-

•“OFF” : when detecting a signal, cancels scanning.

i Push [MENU] to return to scan menu.

pears, scan resumes 2 sec. later.

[TS]

Tuning dial

[MENU]

[V/M]

Mode keys

F 1

F 2F 3

F 4

F 5

F 1

F 2 F 3 F 4 F 5

F 1

F 2F 3

F 4

F 5

SCN MEM SWR TCN VSC

PRO

∂F

FIN SPN SET

∂

F:±1Ok

PRO

∂F

FIN SPN SET

PROG

SCAN

Push [F1]

Push [F1] to start/cancel the scanning.

Push [F1]

F 1

F 2F 3

F 4

F 5

F 1

F 2F 3

F 4

F 5

PRO

∂F

FIN SPN SET

PROG

SCAN

PRO

∂F

FIN SPN SET

F-PROG

SCAN

Push [F3] to switch between programmed scan and fine programmed scan.

SCANS

■ Programmed scan/Fine programmed scan (VFO mode)

Programmed scan searches for signals between scan edge memory channels P1 and P2. The default frequencies for these memories are 0.500000 MHz and

29.99999 MHz, respectively. See p. 66 for scan edges programming.

q Push [V/M] to select VFO mode, if necessary. w Select the desired operating mode.

•The operating mode can also be changed while scanning.

e Push [TS] to select a tuning step.

• The tuning step can also be changed while scanning.

r Push [MENU] to select M2. t Push [F1 SCN] to select the scan menu.

• See p. 69 for scan condition.

•If the [RF/SQL] control function is set as “AUTO,” the

squelch is always open in SSB, CW and RTTY modes.

y Push [F1 PRO] to start the programmed scan.

• The MHz and kHz decimal points blink while scanning.

u When the scan detects a signal, the scan stops,

pauses or ignores it depending on the resume, VSC setting and the squelch condition.

i To cancel the scan, push [F1 PRO].

•Rotating the tuning dial during scan also cancels scan operation.

If the same frequencies are programmed into the scan edge memory channel P1 and P2, programmed scan does not start.

During programmed scan, when a signal is received, scan continues, but the tuning step is temporarily set to 10 Hz.

q Follow steps q to y above to start programmed

w During programmed scan, push [F3 FIN] to switch

e Push [F1 PRO] to cancel the scan.

About the Fine programmed scan

scan.

between programmed scan and fine programmed scan operation.

•Rotating the tuning dial during scan also cancels scan operation.

■ Memory scan operation (Memory mode)

Tuning dial[MENU]

[V/M]

F 1

F 2F 3

F 4

F 5

MEM

∂F

SEL SPN SET

MEMO

SCAN

Push [F1] to start/cancel the scanning.

F 1

F 2F 3

F 4

F 5

F 1

F 2F 3

F 4

F 5

MEM

∂F

SEL SPN SET

MEMO

SCAN

MEM

∂F

SEL SPN SET

SEL-MEMO

SCAN

Push [F3] to switch between memory scan and select memory scan.

F 1

F 2F 3

F 4

F 5

F 1

F 2F 3

F 4

F 5

∂

F:±1Ok

MEM

∂F

SEL SPN SET

Push [F3] to set/cancel as a select channel.

Select memory inidcator

Push [F3] to set/cancel as a select channel.

EDT (

) SEL

14.195OO

USB

• Scan menu

• Memory name screen

Memory scan searches through memory channel 1 to 99 for signals. Blank (unprogrammed) memory channels are skipped.

q Push [V/M] to select memory mode, if necessary. w Push [MENU] to select M2. e Push [F1 SCN] to select the scan menu.

• See p. 69 for scan condition.

•If the [RF/SQL] control function is set as “AUTO,” the

squelch is always open in SSB, CW and RTTY modes.

r Push [F1 MEM] to start the memory scan.

• The MHz and kHz decimal points blink while scanning.

•At least 2 memory channels must be programmed for

memory scan to proceed.

t To cancel the scan, push [F1 MEM].

•Rotating the tuning dial during scan also cancels scan operation.

SCANS

■ Select memory scan

Select memory scan searches through memory channels set as “select,” for signals. See below for setting and deleting select memory channels.

q Follow the steps q to r above to start memory

scan.

w During memory scan, push [F3 SEL] to switch be-

tween memory scan and select memory scan.

•At least 2 memory channels must be set as the select channel.

e Push [F1 MEM] to cancel the scan.

•Rotating the tuning dial during scan also cancels scan operation.

Setting/Cancelling select memory channels

All memory channels, except scan edges (P1 and P2), can be set as a select memory channels.

➥ While the scan menu is selected, push [F3 SEL] to

set/cancel the displayed memory channel as a select channel; or while memory name screen is indicated, push [F5 SEL] to set/cancel the displayed memory channel as a select memory channel.

•“SEL” appears when the channel is set as a select mem- ory channel.

•“SEL” disappears when cancelled.

•Push [F3 SEL]/[F5 SEL] for 1 sec to cancel all select

memory settings.

Keypad

Tuning dial

[MENU]

[V/M]

F 1

F 2F 3

F 4

F 5

F 1

F 2 F 3 F 4 F 5

F 1

F 2F 3

F 4

F 5

SCN MEM SWR TCN VSC

PRO

∂F

FIN SPN SET

∂

F:±1Ok

PRO

∂F

FIN SPN SET

∂

F SCAN

Push [F1]

Push [F2] to start/cancel the scanning.

Push [F2]

Push [F4] to select the span.

F 1

F 2F 3

F 4

F 5

F 1

F 2F 3

F 4

F 5

PRO

∂F

FIN SPN SET

∂

F SCAN

PRO

∂F

FIN SPN SET

F-

∂

F SCAN

Push [F3] to switch between programmed scan and fine programmed scan.

SCANS

■∂∂F scan operation and Fine ∂F scan

∂F scan searches for signals within the specified

range with the displayed VFO or memory channel frequency as for center frequency. The frequency range is speciﬁed by the span.

q Push [V/M] to select VFO mode or memory mode,

as desired.

w Set center frequency of the ∂F scan. e Push [MENU] to select M2. r Push [F1 SCN] to select the scan menu.

• See p. 69 for scan condition.

•If the [RF/SQL] control function is set as “AUTO,” the

squelch is always open in SSB, CW and RTTY modes.

t Set the ∂F span by pushing [F4 SPN].

•±5 kHz, ±10 kHz, ±20 kHz, ±50 kHz, ±100 kHz, ±500 kHz and ±1 MHz are selectable.

y Push [F2 ∂F] to start the ∂F scan.

• Decimal points blink while scanning.

u When the scan detects a signal, the scan stops,

pauses or ignores it depending on the VSC, resume setting and the squelch condition.

i Push [F2 ∂F] to cancel the ∂F scan.

•Rotating the tuning dial during scan also cancels scan operation.

During ∂F scan, when a signal is received, scan continues, but the tuning step is temporarily set to 10 Hz.

q Follow steps q to y above to start programmed

w During ∂F scan, push [F3 FIN] to switch between

About the Fine ∂∂F scan

scan.

∂F scan and ﬁne ∂F scan operation.

e Push [F2 ∂F] to cancel the scan.

•Rotating the tuning dial during scan also cancels scan operation.

■ Tone scan/DTCS code scan operation

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

F 1

F 2 F 3 F 4 F 5

AGC DUP CMP TON SCP

TON

SCN

88.5Hz

Rptr Tone

TON SCN

88.5Hz

Rptr Tone SCAN

Push [F4] for 1 sec.

Push [F1] several times to select tone type.

• Repeater tone scan

• Tone squelch tone scan

• DTCS code scan

TON SCN

88.5Hz

TSQL Tone SCAN

TON SCN

O23-NN

DTCS Code SCAN

Push [F2] to start/cancel the scan.

Push [F1] several times to select polarity.

By monitoring a signal that is being operated with a repeater, tone squelch or DTCS, you can determine the tone frequency necessary to open a repeater or the squelch.

q Push [AM/FM] to select FM mode. w Push [MENU] several times to select M1. e Push [F4 TONE] for 1 sec. to enter tone set mode. r Push [F1 TON] to select the tone type to be

scanned.

•“Rptr Tone” for repeater tone, “TSQL Tone” for tone squelch and “DTCS Code” for DTCS code can be selected.

•When selecting DTCS code to be scanned, push [F5] several times to select the DTCS code polarity.

“NN” : Normal polarity for both transmit and receive. “NR” : Normal polarity for transmit and reverse polarity

for receive.

“RN” : Reverse polarity for transmit and normal polarity

for receive.

“RR” : Reverse polarity for both transmit and receive.

t Push [F2 SCN] to start the tone scan function.

•“Rptr Tone SCAN,” “TSQL Tone SCAN” or “DTCS Code SCAN” blinks when repeater tone scan,

tone squelch scan or DTCS code scan is operated, respectively.

y When a matched tone or code is found, the scan

pauses and the tone frequency or code is set for the selected tone as in step r.

When the tone scan or DTCS code scan is operated in memory or call channel mode, the detected tone frequency or code can be used temporarily. To keep the detected tone frequency or code setting for memory contents, you must over-write the memory or call channel.

u Push [F2 SCN] to cancel the tone scan function.

•Rotating the tuning dial during scan also cancels scan operation.

SCANS

ANTENNA TUNER OPERATION

■ Antenna connection and selection

The IC-746PRO has 2 antenna connectors for the HF/50 MHz bands, [ANT1] and [ANT2], and 1 antenna connector for the 144 MHz band; a total of 3 antenna connectors. For each operating band the IC-746PRO covers, there is a band memory which can memorize a selected antenna. When you change the operating frequency beyond a band, the previously used antenna is automatically selected (see below) for the new band. This function is convenient when you use 2 antennas for HF and 50 MHz bands operation.

• Antenna select function: “Auto”

Once an antenna has been selected for use with a band by pushing [ANT], the antenna is automatically selected whenever that band is accessed.

[ANT]

144 MHz 21/28/50 MHz 3.5/7 MHz

[EXAMPLE]: a 3.5/7 MHz antenna is connected to [ANT1], a 21/28/50 MHz antenna is connected to [ANT2]. When the antenna selector function is set to “Auto,” an antenna is automatically selected when changing bands.

• Antenna select function: “Manual”

When “Manual” is selected, you can use the [ANT1] and [ANT2], however, band memory does not function. In this case you must select an antenna manually. However, the 144 MHz antenna will still be selected automatically.

[EXAMPLE]: an optional antenna tuner and HF antenna are connected to [ANT1] and a 50 MHz antenna is connected to [ANT2].

[ANT1][ANT2]

144 MHz band 50 MHz band HF bands

AH-4

[ANT1][ANT2]

• Antenna select function: “OFF”

In this case, only [ANT1] and the 144 MHz antenna connector can be used. [ANT] switch does not function.

■ Antenna tuner operation

[TUNER]

The internal automatic antenna tuner matches the transceiver to the connected antenna automatically. Once the tuner matches an antenna, the variable capacitor angles are memorized as a preset point for each frequency range (100 kHz steps). Therefore, when you change the frequency range, the variable capacitors are automatically preset to the memorized point.

CAUTION: NEVER transmit with the tuner ON

when no antenna is connected. This will damage the transceiver. Be careful of the antenna selection.

TUNER OPERATION

➥ Push [TUNER] to turn the internal antenna tuner

ON. The antenna is tuned automatically when the antenna SWR is higher than 1.5:1.

• When the tuner is ON, the “TUNE” indicator appears.

• MANUAL TUNING

During SSB operation at low voice levels, the internal tuner may not be tuned correctly. In such cases, manual tuning is helpful.

➥ Push [TUNER] for 1 sec., to start manual tuning.

•A side tone is emitted and “TUNE” indicator blinks while

tuning.

•If the tuner cannot reduce the SWR to less than 1.5:1

after 20 sec. of tuning, the [TUNER] switch indicator goes out.

• AUTOMATIC TUNER START (HF bands only)

If you want to deactivate the tuner under conditions of VSWR 1.5:1 or less, use the auto tuner start function and turn the tuner OFF. This function activates the tuner automatically when the SWR exceeds 1.5:1.

This function is turned ON in set mode. (p. 84).

• PTT TUNER START

The tuner is always tuned when the PTT is pushed after the frequency is changed (more than 1% from last-tuned frequency). This function removes the “push and hold [TUNER]” operation and activates for the ﬁrst transmission on a new frequency.

This function is turned ON in set mode. (p. 84).

• Antenna tuner of the IC-PW1

When using an external antenna tuner such as the IC-PW1’s tuner, tune with the external antenna tuner, while the internal tuner is turned OFF. After tuning is completed, turn the internal tuner ON. Otherwise, both tuners tune simultaneously and correct tuning may not be obtained.

See the instruction manual included with each antenna tuner for their respective operations.

ANTENNA TUNER OPERATION

NOTES:

•The internal antenna tuner can only tune the HF and 50 MHz bands— the 144 MHz band cannot be tuned.

•NEVER transmit without an antenna properly connected to antenna port in use.

•When 2 antennas are connected, select the antenna to be used with [ANT].

•If the SWR is higher than about 1.5:1 when tuning above 100 kHz on an antenna’s preset point, push [TUNER] for 1 sec. to start manual tuning.

•The internal tuner may not be able to tune in AM mode. In such cases, push [TUNER] for 1 sec. to manually tune.

If the tuner cannot tune the antenna

Check the following and try again:

• the [ANT] connector selection.

• the antenna connection and feedline.

•the unaltered antenna SWR.

Less than 2.5:1 for 50 MHz band)

•the transmit power. (8 W for HF bands; 15 W for 50 MHz

band)

• the power source voltage/capacity.

(Less than 3:1 for HF bands;

If the tuner cannot reduce the SWR to less than 1.5:1 after checking the above, perform the following:

• repeat manual tuning several times.

• tune with a 50 Ω dummy load and re-tune the antenna.

• turn power OFF and ON.

•adjust the antenna cable length.

(This is effective for higher frequencies in some cases.)

•Some antennas, especially for low bands, have a nar-

row bandwidth. These antennas may not be tuned at the edge of their bandwidth, therefore, tune such an antenna as follows:

[Example]: Suppose you have an antenna which has an SWR of 1.5:1 at 3.55 MHz and an SWR of 3:1 at 3.8 MHz.

q Push [TUNER] to turn the antenna tuner ON. w Select CW mode. e Turn OFF the break-in function. (p. 56) r Push [TRANSMIT] to set to the transmit condition. t Set 3.55 MHz and key down. y Set 3.80 MHz and key down. u Push [TRANSMIT] to return to the receive condition.

For mobile operation

For outdoor operation

Long wire

Optional AH-2b antenna element

[TUNER]

Coaxial cable (from AH-4)

ANT1

Transceiver

Ground

AH-4

Control cable

Long wire or optional AH-2b

ANTENNA TUNER OPERATION

■ Optional external tuner operation

AH-4 HF/50 MHz AUTOMATIC ANTENNA TUNER

The AH-4 matches the IC-746PRO to a long wire antenna more than 7 m/23 ft long (3.5 MHz and above).

•See the AH-4 instruction manual for AH-4 installation and antenna connection details.

NEVER operate the AH-4 without an antenna wire. The tuner and transceiver will be damaged.

NEVER operate the AH-4 when it is not grounded.

Transmitting before tuning may damage the transceiver. Note that the AH-4 cannot tune when using a

⁄2 λ long wire or multiple of the operating frequency.

When connecting the AH-4, the antenna connector assignments are [ANT2] for the internal tuner and [ANT1] for the AH-4. The antenna indicator in the LCD displays “EXT” when the AH-4 is connected and selected.

AH-4 operation

Tuning is required for each frequency. Be sure to re-tune the antenna before transmitting when you change the frequency— even slightly.

AH-4 setting example:

R WARNING: HIGH VOLTAGE!

NEVER touch the antenna element while tuning or

transmitting.

q Set the desired frequency in an HF or 50 MHz

band.

•The AH-4 may not operate on frequencies outside of ham bands.

w Push [TUNER] for 1 sec.

•“TUNER” blinks while tuning.

e “TUNE” appears constantly when tuning is com-

plete.

•When the connected wire cannot be tuned, the “TUNE” indicator goes out, and the AH-4 is bypassed. At that point the antenna wire connection root is to the transceiver directly, and not via AH-4 antenna tuner.

To bypass the AH-4 manually, push [TUNER].

• Connecting the AH-4

■ Connections

■ When connecting to [DATA]

• When using a PC application

• When using a TNC

q DATA IN w GND

r DATA OUT (9600 bps)

y P SQL* t AF OUT (1200 bps)

e PTT P

TX AUDIO GND

RX AUDIO

SQL

PTT

q DATA IN w GND

r DATA OUT (9600 bps)

y P SQL* t AF OUT (1200 bps)

e PTT P

TX AUDIO GND

TNC

RS-232C

RX AUDIO

SQL

PTT

Connect to serial port, parallel port, speaker jack, microphone jack and line IN/OUT jack, etc. See the instruction manual of the application for details.

*When connecting the squelch line, consult the necessary manual (TNC, etc.)

DATA COMMUNICATION

■ When connecting to [ACC(1)]

• When using a PC application

RTTY

GND

SEND

• When using a TNC

RTTY

Rear panel view

GND

SEND

■ When connecting to [MIC]

• When using a PC application

MIC INPUT AF OUTPUT

• When using a TNC

MIC GND GND

PTT*

MIC INPUT AF OUTPUT

MIC GND GND

RTTY OUTPUT

GND

AUDIO INPUT

PTT

RTTY OUTPUT GND

AUDIO INPUT

PTT

AUDIO OUTPUT AF INPUT

GND

PTT*

AFSK OUTPUT AF INPUT

GND

Connect to serial port, parallel port, speaker jack, microphone jack and line IN/OUT jack, etc. See the instruction manual of the application for details.

TNC or scan converter

Connect to serial port, parallel port, speaker jack, microphone jack and line IN/OUT jack, etc. See the instruction manual of the application for details.

TNC or scan converter

RS-232C

PTT* SQL

PTT* SQL INPUT

*When using the VOX function, no need to connect. Refer to the instruction manual of the external equipment (TNC, etc.).

When connecting the squelch line, consult the necessary manual (TNC, etc.).

Band keys[TX] indicator[TRANSMIT]

[MIC GAIN] [AM/FM] Tuning dial

Selected mode indicator appears

[SSB]

• Example— LSB/LSB data mode Mark freq.: 2125 Hz Shift freq.: 200 Hz

2325 Hz

200 Hz 2125 Hz

Carrier point

(Displayed frequency)

DATA COMMUNICATION

■ Packet (AFSK) operation

Before operating packet (AFSK) be sure to consult the operating manual that came with your TNC.

q Connect a TNC and PC. (p. 78) w Push a band key to select an operating band. e Push [SSB] or [AM/FM] to select the desired operat-

ing mode.

•After LSB or USB is selected, push [SSB] for 1 sec. to select LSB data or USB data mode, or after AM or FM is selected, push [AM/FM] for 1 sec. to select AM data or FM data mode.

•Generally, LSB is used on HF bands and FM is used for packet operation on the VHF band.

r Rotate the tuning dial to tune the desired signal. t Transmit your AFSK signals using your computer’s

keyboard.

• Rotate [RF PWR] to set the output power.

•Relative strength of the transmitted signal is indicated in

the Po meter while operating the TNC.

•When operating in SSB (data) mode, adjust output power so that the ALC reading in the ALC meter stays in the ALC zone.

NOTE: When connecting a TNC to the ACC socket on the rear panel, select SSB (LSB/USB) data mode or disconnect the microphone and rotate [MIC GAIN] fully counterclockwise.

When SSB data mode is selected, the audio input from the [MIC] connector is automatically cut, and the audio input from the [ACC(1)] is used.

Also, when the SSB data mode is selected, the ﬁxed

setting listed below are selected automatically;

• Speech compressor : OFF

• Transmit bandwidth : MID

• Tx tone (Bass) : 0

• Tx tone (Treble) : 0

Frequency indication during AFSK operation

When operating AFSK in SSB mode, the indicated frequency is the signals carrier point.

■ Adjusting the TNC output level

96OObps Mode

OFF

96OObps Mode

Select with the tuning dial

When setting data transmission speed to 9600 bps, the data signal coming from the TNC is applied exclusively to the internal limiter circuitry to automatically maintain band width.

NEVER apply data levels from the TNC of over 0.6 V p-p, otherwise the transceiver will not be able to maintain the band width and may possibly interfere with other stations.

Using with a level meter or synchroscope

When using a level meter or synchroscope, adjust the TX audio output level (DATA IN level) from the TNC as follows.

0.4 V p-p (0.2 Vrms) : recommended level

0.2–0.5 V p-p (0.1–0.25 Vrms) : acceptable level

Not using a measuring device

q Connect the transceiver to a TNC. (p. 78) w Enter a test mode (“CAL,” etc.) on the TNC, then

transmit some test data.

e When the transceiver fails to transmit the test data

or transmits sporadically (TX indicator doesn’t light or ﬂashes):

-Decrease the TNC output level until the transmit indicator lights continuously.

When transmission is not successful even though the TX indicator lights continuously:

- Increase the TNC output level.

DATA COMMUNICATION

■ Data transmission speed

For data communication (in FM mode), the transceiver can be set to to a maximum data speeds of 9600 bps (or less; 1200, 2400 or 4800 bps).

q Push [MENU] for 1 sec. to enter set mode. w Push [F1 ≤] or [F2 ≥] to select the 9600bps

Mode item.

e Rotate the tuning dial to turn the 9600 bps mode ON

and OFF.

ON : 9600 bps of data speed OFF : 1200, 2400 or 4800 bps of data speed

(default)

r Push [MENU] to return to previous indication.

LCD Backlight

5O%

LCD Contrast

5O%

Beep Level

5O%

Beep Level-lmt

Cal. Marker

OFF

SET MODE

■ General set mode

Entering set mode

Set mode is used for programming infrequently changed values or conditions of functions.

• Set mode operation

q Push [MENU] several times to select the function

menu indication, if necessary.

w Push [MENU] for 1 sec. to enter the set mode. e Push [F1 ≤] or [F2 ≥] to select the desired item. r Set the desired condition using the tuning dial.

•Push [F3] for 1 sec. to select a default condition or value.

t Push [MENU] to exit the set mode.

Set mode items

1. LCD Contrast

This item adjusts the contrast of the LCD from 0% to 100% in 1% steps. (default: 50%)

2. LCD Backlight

This item adjusts the brightness of the LCD from 0% to 100% in 1% steps. (default: 50%)

[F1 ≤]

[F2 ≥]

Tuning dial[MENU]

3. Beep Level

This item adjusts the volume level for confirmation beep tones from 0% to 100% in 1% steps. When the beep tones, item 6. Beep (p. 82), are turned OFF, this setting has no effect. (default: 50%)

4. Beep Level-lmt

This item allows you to set a maximum volume level for conﬁrmation beep tones. Conﬁrmation beep tones are linked to the [AF] control until a speciﬁed volume level is reached— further rotation of the [AF] control will not increase the volume of the beep tones.

ON Conﬁrmation beep ON (default) OFF Conﬁrmation beep OFF

5. CAL. Marker

This item is used for a simple frequency check of the transceiver.

ON Calibration marker ON OFF Calibration marker OFF (default)

See p. 94 for calibration procedure.

Turn the calibration marker OFF after checking the frequency of the transceiver.

Beep

Band Edge Beep

RF/SQL Control

RF+SQL

Meter Peak Hold

O OFF

COMP Meter

■ General set mode (continued)

6. Beep

A beep sounds each time a switch is pushed to conﬁrm it. This function can be turned OFF for silent operation.

ON Conﬁrmation beep ON (default) OFF Conﬁrmation beep OFF

The volume level can be set in 3. Beep Level. (p. 81)

7. Band Edge Beep

A beep sounds when an operating frequency enters or exits an amateur band. This functions independent of the conﬁrmation beep setting (above).

ON Band edge beep ON (default) OFF Band edge beep OFF

SET MODE

The volume level can be set in 3. Beep Level. (p. 81)

8. RF/SQL Control

The [RF/SQL] control can be set as the RF/squelch control (default), the squelch control only (RF gain is ﬁxed at maximum) or ‘Auto’ (RF gain control in SSB, CW and RTTY; squelch control in AM and FM).

RF+SQL [RF/SQL] control as RF/squelch con-

trol (default)

SQL [RF/SQL] control as squelch control AUTO [RF/SQL] control as RF gain control

in SSB, CW and RTTY; squelch control in AM and FM

9. Meter Peak Hold

This item turns the meter peak hold function ON and OFF. When set to ON (default), peak meter readings are displayed for about 0.5 sec.

10. COMP Meter

This item turns the COMP meter indication ON and OFF during transmit. When set to ON, the COMP meter is displayed instead of the SWR meter. (default: OFF)

Quick SPLIT

O.OOOMHz

SPLIT Offset

OFF

SPLIT LOCK

O.1OOMHz

DUP Offset

O.5OOMHz

DUP Offset

5OM

O.6OOMHz

DUP Offset 144M

SET MODE

■ General set mode (continued)

11. Quick SPLIT

When this item is set to ON, pushing [SPLIT] for 1 sec. sets the transmit frequency using the displayed frequency and the split offset, set in SPLIT Off- set item below, and activates the split function automatically.

ON Quick split ON (default) OFF Quick split OFF

12. SPLIT Offset

This item sets the offset (difference between transmit and receive frequencies) for the quick split function.

The offset frequency can be set from –9.999 MHz to +9.999 MHz in 1 kHz steps.

13. SPLIT LOCK

When this item is ON, the tuning dial can be used to adjust the transmit frequency while pushing [XFC] even while the dial lock function is activated.

ON Split lock function ON OFF Split lock function OFF (default)

14. DUP Offset HF

This item sets the offset (difference between transmit and receive frequencies) for duplex operation. However, this setting is used to input the repeater offset for an HF band only.

The offset frequency can be set from 0.000 MHz to

9.999 MHz in 1 kHz steps.

15. DUP Offset 50M

This item sets the offset (difference between transmit and receive frequencies) for duplex operation. However, this setting is used to input the repeater offset for a 50 MHz band only.

The offset frequency can be set from 0.000 MHz to

9.999 MHz in 1 kHz steps.

16. DUP Offset 144M

This item sets the offset (difference between transmit and receive frequencies) for duplex operation. However, this setting is used to input the repeater offset for a 144 MHz band only.

The offset frequency can be set from 0.000 MHz to

9.999 MHz in 1 kHz steps.

DUP-

One Touch Rptr

ON-1

Auto Repeater

OFF

Auto Tune

OFF

PTT Tune

OFF

96OObps Mode

■ General set mode (continued)

17. One Touch Rptr

This item turns the one touch repeater function ON (DUP- or DUP+) and OFF.

When [F2 DUP] is pushed for 1 sec. in M1, the selected offset direction and the programmed duplex offset frequency (depending on the operating frequency band) is set with the displayed frequency.

18. Auto Repeater

This item turns the auto repeater function to ON-1 (auto duplex setting), ON-2 (auto duplex setting and activating tone encoder) or OFF.

See p. 46 for details concerning the auto repeater function.

SET MODE

19. Auto Tune

The internal antenna tuner has an automatic start capability which starts tuning if the SWR is higher than

1.5–3:1 in the HF bands.

When “OFF” is selected, the tuner remains OFF even when the SWR is poor (1.5–3:1). When “ON” is selected, automatic tune starts even when the tuner is turned OFF.

20. PTT Tune

Tuning of the internal or external antenna tuner can be started automatically at the moment the PTT is pushed after the operating frequency is changed (more than 1% from the last-tuned frequency).

21. 96OObps Mode

This item turn the 9600 bps data transmission capability ON and OFF.

ON : For 9600 bps data transmission. OFF : For the regular audio (or slower data)

transmission only.

Auto

[ANT] Switch

English

SPEECH Language

HIGH

SPEECH Speed

SPEECH S-Level

Memory Pad Ch

SET MODE

■ General set mode (continued)

22. [ANT] Switch

You can set the antenna connector selection to automatic, manual or non-selection (when using 1 antenna only for the HF/50 MHz bands).

Auto : The antenna switch is activated and

the band memory memorizes the selected antenna. (default)

Manual: The antenna switch is activated and

selects an antenna manually.

OFF : The antenna switch is not activated

and does not function. The [ANT1] connector is always selected in this case.

23. SPEECH Language

When the optional UT-102 installed, you can select between English and Japanese as the language.

VOICE SYNTHESIZER UNIT

English : Announces in English (default) Japanese : Announces in Japanese

See p. 90 for unit installation.

24. SPEECH Speed

When the optional UT-102 installed, you can select between faster or slower synthesizer output.

HIGH : Announces faster (default) LOW : Announces slower

See p. 90 for unit installation.

VOICE SYNTHESIZER UNIT

25. SPEECH S-Level

When the optional UT-102 installed, you can have frequency, mode and signal level announcement. Signal level announcement can be deactivated if desired.

ON : Announces operating frequency, mode

and receiving signal level. (default)

OFF : Announces operating frequency and

mode only.

VOICE SYNTHESIZER UNIT

See p. 90 for unit installation.

26. Memory Pad Ch

This item sets the number of memo pad channels available. 5 or 10 memo pads can be set.

5 : 5 memo pads (default) 10: 10 memo pads

HIGH

DIAL Auto TS

HIGH

MIC U/D Speed

OFF

Quick RIT Clear

BW Popup (PBT)

BW Popup (FIL)

■ General set mode (continued)

27. DIAL Auto TS

This item sets the auto tuning step function. When rotating the tuning dial rapidly, the tuning step automatically changes several times as selected.

There are 2 type of auto tuning steps: HIGH (Fastest) and LOW (Faster).

HIGH : Auto tuning step is turned ON.

Approx. 5 times fastest tuning step during rapid rotation (default)

LOW : Auto tuning step is turned ON.

Approx. 2 times faster tuning step during rapid rotation

OFF : Auto tuning step is turned OFF.

28. MIC U/D Speed

This item sets the rate at which frequencies are scanned when the microphone [UP]/[DN] switches are pushed and held. High or low can be selected.

SET MODE

HIGH : High speed (default, 50 tuning

steps/sec.)

LOW : Low speed (25 tuning steps/sec.)

29. Quick RIT Clear

This item selects the RIT/∂TX frequency clearing instruction with [PBTC].

ON : Clears the RIT/∂TX frequency when

[PBTC] is pushed momentarily.

OFF : Clears the RIT/∂TX frequency when

[PBTC] is pushed for 1 sec. (default)

30. BW Popup (PBT)

This item turns the PBT shifting value indication ON and OFF during [TWIN PBT] control operation. When set to ON, the shifting value is displayed above the multi-function switches. (default: ON)

31. BW Popup (FIL)

This item turns the IF filter width indication ON and OFF when selecting with [FILTER]. When set to ON, the filter width is displayed above the multi function switches. (default: ON)

OFF

SSB/CW Sync Tun

LSB

CW Normal Side

34 KEYER-Root

KEYER

1st Menu

To [MIC] connector pin e

To [MIC] connector pin u

1.5kΩ

2.2kΩ

4.7kΩ

S1 (T1/M1)

S2 (T2/M2)

S3 (T3/M3)

S4 (T4/M4)

USER EXTERNAL KEYPAD

OFF

External Keypad

SET MODE

■ General set mode (continued)

32. SSB/CW Synchronous Tuning

This item selects the displayed frequency shift function from ON and OFF.

When this function is activated, the receiving signal can be kept in receive even when the operating mode is changed between SSB and CW.

ON : The displayed frequency shifts when

the operating mode is changed between SSB and CW.

OFF : The displayed frequency does not shift.

(default)

The frequency shifting value may differ according to the CW pitch setting.

33. CW Normal Side

Selects the carrier point of CW mode from LSB and USB.

LSB : The carrier point is set to LSB side.

(default)

USB : The carrier point is set to USB side.

34. KEYER 1st Menu

This item selects the appearing menu when [F4 KEY] is pushed in M1 at first, from KEYER-Root and

KEYER-SEND.

KEYER-Root : Selects memory keyer

menu ﬁrst (default)

KEYER-SEND : Selects keyer SEND menu

ﬁrst

35. External Keypad

This item sets the external keypad capability.

OFF : External keypad does not func-

tion. (default)

KEYER SEND : Pushing one of external keypad

switches, transmits the desired keyer memory contents during CW mode operation.

For your information

The diagram as at right shows the equivalent circuit of an external keypad and connects to pin 3 and pin 7 of the [MIC] connector (p. 12)

Icom IC-746PRO User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual