Icom IC-703 User Manual

INSTRUCTION MANUAL

HF/50 MHz

ALL MODE TRANSCEIVER

i703

FOREWORD

Thank 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-703 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-703.

FEATURES

DSP features (AF DSP; UT-106 DSP UNIT required some version)

All mode capability covering 160–6 m

9.0–15.87 V operation

Compact with detachable front panel

±0.5 ppm of high frequency stability

Built in antenna tuner

Simple band scope function

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-703.

EXPLICIT DEFINITIONS

WORD	DEFINITION

Personal injury, fire hazard or electric RWARNING shock may occur.

CAUTION Equipment damage may occur.

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

shock.

PRECAUTION

RWARNING 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).

RWARNING HIGH VOLTAGE! NEVER attach an antenna or internal antenna connector during transmission. This may result in an electrical shock or burn.

RNEVER apply AC to the [DC13.8V] receptacle on the transceiver rear panel. This could cause a fire or damage the transceiver.

RNEVER apply more than 16 V DC, such as a 24 V battery, to the [DC13.8V] receptacle on the transceiver rear panel. This could cause a fire or damage the transceiver.

RNEVER let metal, wire or other objects touch any internal 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 temperatures 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.

i

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 rear panel 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-703 may damage the transceiver.

Beat signals may be heard on some frequencies. These will occur as a result of circuit construction.

For U.S.A. only

Caution: Changes or modifications to this transceiver, not expressly approved by Icom Inc., could void your authority to operate this transceiver under FCC regulations.

FOREWORD …………………………………………… i IMPORTANT ……………………………………………i

EXPLICIT DEFINITIONS ……………………………… i PRECAUTION …………………………………………i

TABLE OF CONTENTS ……………………………… ii

QUICK REFERENCE GUIDE ……………… I–X

■Installation ………………………………………… I

1.Grounding your Shack ……………………… I

2. Installing your DC Power Supply ………… I

3.Installing lightning protection ……………… II

4.Installing your antenna system …………… II

5.Connect other peripheral equipment …… III

■Operation ………………………………………… III

1.Voice ………………………………………… III

2.CW…………………………………………… III

3.Other convenient items …………………… IV

■Your first contact ………………………………… IV D Getting started ………………………………… IV D Just listening …………………………………… V

1.Select the desired band …………………… V

2.Tune to the desired frequency …………… V

3.Adjust audio output ………………………… V D What are you hearing? ……………………… VI

1.Verify mode ………………………………… VI

2.Reducing interference (Some functions may require

an optioanl unit depending on version) … VI

■Ready to call CQ? ……………………………… IX

1.Setting up your Mic Gain ………………… IX

2.Speech compressor………………………… X

TABLE OF CONTENTS

1 PANEL DESCRIPTION ………………… 1–10

■Front panel ………………………………………… 1

■Multi-function switches …………………………… 4 DM1 functions …………………………………… 4 DM2 functions …………………………………… 4 DM3 functions …………………………………… 4 DM4 functions …………………………………… 5 DS1 functions …………………………………… 6 DS2 functions …………………………………… 6 DS3 functions …………………………………… 6 DS4 functions

(UT-106 is required for some version) ……… 6

■Rear panel ………………………………………… 7 DDATA socket …………………………………… 8 DACC socket……………………………………… 8

■Function display…………………………………… 9

■Microphone (HM-103) ………………………… 10

2 INSTALLATION AND CONNECTIONS … 11–16

■Unpacking………………………………………… 11

■Selecting a location……………………………… 11

■Grounding………………………………………… 11

■Antenna connection……………………………… 11

■Installation ……………………………………… 12 DSingle body mounting ………………………… 12 DStand …………………………………………… 12 DFront panel separation ……………………… 12 DFront panel mounting ………………………… 12

■Required connections…………………………… 13

■Advanced connections ………………………… 14

■DC Power voltage ……………………………… 15

■DC Power supply connections ………………… 15

■Battery connections …………………………… 15

■External antenna tuners and linear amplifier … 16

SUPPLIED ACCESSORIES

The transceiver comes with the following accessories.

		Qty.
q Hand microphone (HM-103) ..............................		1
w DC power cable (OPC-1229) .............................		1
e Spare fuse (FGB 4 A) ........................................		3
r ACC cable ...........................................................		1
t 3.5	(d) mm plug ...................................................	1
y 6.5	(d) mm Electronic keyer plug.........................	1
u Microphone hanger..............................................		1

q

w

e

r

t y u

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.

Quick Reference

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

ii

TABLE OF CONTENTS

3 BASIC OPERATION ……………………17–26

■When first applying power (CPU resetting)…… 17 DM1 display selection ………………………… 17

■Initial settings …………………………………… 17

■VFO description ………………………………… 18 DThe differences between VFO and

memory mode ………………………………… 18

■Frequency setting ……………………………… 19

■Operating mode selection ……………………… 23

■Volume setting …………………………………… 23

■Squelch and receive (RF) sensitivity ………… 24

■Dial lock function ………………………………… 25

■Basic transmit operation ……………………… 25 DTransmitting …………………………………… 25 DMaximum output power ……………………… 25 DSetting output power ………………………… 26 DSetting microphone gain……………………… 26

4 RECEIVE AND TRANSMIT …………… 27–45

■Operating SSB…………………………………… 27 DConvenient functions for receive …………… 27 DConvenient functions for transmit …………… 27

■Operating CW …………………………………… 28 DConnections for CW ………………………… 28 DCW operation ………………………………… 29 DConvenient functions for receive …………… 30 DConvenient functions for transmit …………… 30 DCW reverse mode …………………………… 30 DCW pitch control ……………………………… 31 DElectronic CW keyer ………………………… 31 DCW side tone function………………………… 32 DKeyer set mode ……………………………… 32

■Memory keyer functions………………………… 33 DMemory keyer send menu …………………… 34 DEditing a memory keyer ……………………… 35 DContest number set mode …………………… 36 DMemory keyer set mode……………………… 37

■Operating RTTY ………………………………… 38 DConnections for RTTY (FSK)………………… 38 DRTTY (FSK) operation ……………………… 38 DConvenient functions for receive …………… 39 DRTTY reverse mode ………………………… 39 DPresetting for RTTY ………………………… 40 DRTTY tone set mode ………………………… 40

■Operating AM …………………………………… 41 DConvenient functions for receive …………… 41 DConvenient functions for transmit …………… 41

■Operating FM …………………………………… 42 DConvenient functions for receive …………… 42 DConvenient functions for transmit …………… 42 DTone squelch operation ……………………… 43 DTone scan operation ………………………… 43 DFM tone set mode …………………………… 44

■Repeater operation ……………………………… 45

5 FUNCTION FOR RECEIVE …………… 46–50

■Simple band scope ……………………………… 46

■Preamp and attenuator ………………………… 46

■RIT function ……………………………………… 47

■IF shift function ………………………………… 47

■Noise blanker …………………………………… 48

DNoise blanker level set mode ……………… 48

■AGC time constant ……………………………… 48

■Optional filter selection ………………………… 49

■Peak meter hold ………………………………… 50

■DSP Functions (may require an optional unit depending on version) ………………………… 50 DANF (Automatic Notch Filter) function ……… 50 DNR (Noise Reduction) function ……………… 50

6 FUNCTION FOR TRANSMIT …………… 51–55

■Split frequency operation ……………………… 51 DQuick split function …………………………… 52

■Meter selection ………………………………… 52

■VOX operation …………………………………… 53 DVOX set mode ………………………………… 53

■Speech compressor …………………………… 54 DCompression level set mode ………………… 54

■SWR………………………………………………… 55 DMeasuring SWR ……………………………… 55

7 MEMORY OPERATION ………………… 56–60

■Memory channels ……………………………… 56

■Memory channel selection……………………… 56

■Memory programming ………………………… 57

■Memory clearing ………………………………… 58

■Frequency transferring ………………………… 58

■Memory names ………………………………… 59

■Memo pads ……………………………………… 60

8 SCAN OPERATION …………………… 61–63

■Scan types ……………………………………… 61

■Preparation ……………………………………… 61

■Programmed scan operation…………………… 62

■Memory scan operation ………………………… 62

■Select memory scan operation ………………… 63

■Priority watch …………………………………… 63

9 ANTENNA TUNER OPERATION……… 64–66

■Antenna tuner operation ……………………… 64 DInternal antenna tuner………………………… 64 DTuner operation ……………………………… 64 DOptional external tuner operation …………… 65 DOptional AT-180

AUTOMATIC ANTENNA TUNER operation ……… 65

DOptional AH-4

AUTOMATIC ANTENNA TUNER operation ……… 66

iii

TABLE OF CONTENTS

	10 DATA COMMUNICATION …………… 67–70	29 [UP]/[DN] speed ………………………… 80
	■Connections for packet ………………………… 67	30 Noise blanker in AM mode ……………… 80
	DWhen connecting to [DATA] socket ………… 67	31 Available memo pads …………………… 80
	DWhen connecting to [ACC] socket ………… 67	32 Power ON check function ……………… 81
	DWhen connecting to [MIC] connector ……… 67	33 Auto tune start function ………………… 81
	■Packet (AFSK) operation ……………………… 68	34 PTT tune function ………………………… 81
	DFrequency indication during AFSK operation … 68	35 Tuner switch condition …………………… 81
	DSSB-D mode selection ……………………… 69	36 Packet data speed ……………………… 81
	DCarrier point setting…………………………… 69	37 Voice synthesizer language……………… 82
	DAdjusting the transmit signal from the TNC… 70	38 Voice synthesizer speed ………………… 82
	11 CONTROL COMMAND ……………… 71–73	39 S-meter level speech …………………… 82
		40 CI-V address setting ……………………… 82
	■Remote jack (CI-V) information ……………… 71	41 CI-V data transffer rate…………………… 82
	DCI-V connection example ……………………… 71	42 CI-V transceive …………………………… 82
	DData format ……………………………………… 71	43 CI-V operating frequency data length … 82
	DCommand table ……………………………… 72	13 MAINTENANCE …………………………… 83
	D Band stacking register ……………………… 73
		■Fuse replacement ……………………………… 83
	D Codes for memory keyer contents ………… 73
	D Codes for memory name contents ………… 73	■Memory backup ………………………………… 83
	12 SET MODE …………………………… 74–82	■Cleaning ………………………………………… 83
		14 TROUBLESHOOTING………………… 84–85
	■General …………………………………………… 74
	DQuick set mode operation …………………… 74	15 OPTIONAL UNIT
	DInitial set mode operation …………………… 74
		INSTALLATIONS AND SETTINGS … 86–89
	■Quick set mode items…………………………… 75
		■Opening the transceiver case ………………… 86
	■Initial set mode items …………………………… 76
		■UT-102 VOICE SYNTHESIZER UNIT ……………… 86
	1 Maximum output power setting ………… 76
		DOperation ……………………………………… 86
	2 Power save setting ……………………… 76
		■IF filter …………………………………………… 87
	3 Simple mode setting ……………………… 76
		■UT-106 DSP RECEIVER UNIT …………………… 88
	4 Mode availability ………………………… 76
		■MB-72 CARRYING HANDLE ……………………… 88
	5 Output power setting for mode ………… 76
		■AT-180 internal switch description …………… 89
	6 Confirmation beeps ……………………… 77
	7 Band edges beeps ……………………… 77	16 SPECIFICATIONS ………………………… 90
	8 Beep level adjustment …………………… 77
		■General …………………………………………… 90
	9 Beep audio level limit …………………… 77
		■Transmitter ……………………………………… 90
	10 CW carrier point setting ………………… 77
		■Receiver ………………………………………… 90
	11 CW side tone level ……………………… 77
		■Antenna tuner …………………………………… 90
	12 CW side tone level limit ………………… 77
	13 SSB/CW frequency shift setting ………… 78	17 OPTIONS ……………………………… 91–92
	14 Display backlighting ……………………… 78	18 MENU GUIDE ………………………… 93–94
	15 Key/switch backlighting ………………… 78
	16 Light timer setting ………………………… 78	19 ABOUT CE……………………………… 95–96
	17 LED brightness …………………………… 78
	18 Automatic power OFF …………………… 78
	19 Current intercept point …………………… 79
	20 RF gain/squelch control ………………… 79
	21 Sub dial setting …………………………… 79
	22 Optional filter selection…………………… 79
	23 Peak meter hold setting ………………… 79
	24 Quick split function ……………………… 79
	25 Split lock function ………………………… 80
	26 Split offset frequency …………………… 80
	27 Scan resume condition…………………… 80
	28 Scanning speed…………………………… 80

Quick Reference

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2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

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iv

QUICK REFERENCE GUIDE

■ 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.

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.

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 neighbours 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-703 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.

RWARNING!: NEVER ground station equip- ment or antennas to house gas lines. NEVER at- tach ground lines to plastic (pvc) pipe.

D Some Symptoms if inadequate grounding a. Poor DC Ground

50/60 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-703 is the PS-125. This plug and play unit plugs into the DC power receptacle using an optional OPC-1248 located on the rear of the radio.

Or connect the supplied DC power cable (OPC-1229) to the appropriate color coded terminals, then insert the DC connector into the DC power receptacle located on the rear of the radio.

NOTE: Although the power supply current require-

ment 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.

I

			Transceiver
	Ground		AC
		to DC
	PS-125		outlet
		power	A DC power
		receptacle	supply*
			Black Red
			_ +
		*13.8 V;
		at least 3.0 A
		continuous	AC cable
	DC power cable
	Optional	Supplied
	OPC-1248	OPC-1229

	Connect to an AC outlet	4 A fuses
	using the supplied AC cable.

QUICK REFERENCE GUIDE

3. Installing lightning protection

Although you may not live in an area with high occur-	NOTE: There are many publications covering
rence for lightning storms, it is always wise to take	proper lightning protection, check with your local
precautions for lightning or static discharges. Proper	dealer for more information and recommendations.
lightning protection not only offers protection to the
ham gear, but the shack and most importantly the op-
erator.

4. Installing your antenna system

Whether your IC-703 is your first radio or one of many, one of your key elements in a great shack is the antenna system. There is a connection on the back of your IC-703, for HF and 6 m. If you are using one antenna for HF and 6 m, for simplicity, connect the antenna coax to ANT.

ANTENNA

Connect a HF/50MHz antenna

Impedance: 50Ω

Your IC-703 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

q					30 mm
Coupling ring				10 mm (soft solder)
w				10 mm			Soft
							solder
					1–2 mm
e					solder solder

r

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.

Screw the coupling ring onto the connector body.

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

RWARNING: Although a mag mount antenna

works great on a vehicle, DO NOT use the IC-703

with this type of antenna.

CAUTION: Although your IC-703 has protection to

drop down power with a high SWR, this does not

completely protect the transceiver from transmis-

sion 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 recom- mendations.

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-703 has an SWR meter to monitor the antenna SWR continuously.

Quick Reference

II

QUICK REFERENCE GUIDE

5. Connect other peripheral equipment

Everyone has his or her favorite ad-on gear; now is	If you do not see the particular item you are wanting
the time to connect this gear! We will cover the basic	to connect, refer to the Advance Connections section
devices that can be connected to your IC-703.	starting on page 14.

■ Operation

1. Voice

Microphones: Connect the microphone to the modu- lar-type connector bottom of the front panel or back of the radio.

Front panel

Rear panel	MICROPHONES

HM-103

SM-20 OPC-589

2. CW

CW Key: There are several types of keys or keyers that can be used with your IC-703.

a.Iambic Key paddle: Use a 6.35(d) mm (1⁄4″) stereo plug and connect to the [KEY] jack located on the rear of the radio.

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 (1⁄4″) mono plug and connect to the back of the radio.

Rear panel										Rear panel

CW KEY

When connecting a paddle

(dot)

(com)

(dash)

CW KEY

A straight key can be used when the internal electronic keyer is turned OFF in keyer set mode. (p. 32)

When connecting a straight key or else

(+)

(_)

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.

III

QUICK REFERENCE GUIDE

3. Other convenient items

Headphones:

A 3.5(d) mm (1⁄4″) mono jack for operation without using the internal or external speakers. Perfect for operation without disturbing others in the room.

Front panel

HEADPHONES

PHONES ∫

SPEAKER √

Select ‘PHONES’ with the [PHONES/SPEAKER] switch on the back of the front panel.

External Speaker:

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

Rear panel

SPEAKER

or

Front panel

SPEAKER

PHONES ∫

SPEAKER √

Select ‘SPEAKER’ with the [PHONES/SPEAKER] switch on the back of the front panel.

■ Your first contact

Now you should have your IC-703 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.

DGetting 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.
• [RF/SQL]	: The control for the RF Gain and
	Squelch circuits: 12 o’clock.
• [SHIFT]	: Shifts the IF center frequency:
	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. (Refer to p.17)

[POWER]

[Y]

[Z]

Quick Reference

IV

QUICK REFERENCE GUIDE

DJust listening

1. Select the desired band

On your IC-703, an easy way of changing bands is by using the [(Y)BAND] or [(Z)BAND] located just right corner on the front panel.

Push [(Y)BAND] or [(Z)BAND] to select the desired band.

•Pushing [(Y)BAND] or [(Z)BAND] continuously scrolls through the available bands.

[Y]

[Z]

•Say you want to go to 20 meters or 14 MHz; you would push [(Y)BAND] or [(Z)BAND] several times to select it. This will change the displayed operating frequency to the 20-meter band.

NOTE: The band stacking register can also be used to select bands. (Refer to p. 22)

2. Tune to the desired frequency

Directly left of the [(Y)BAND]/[(Z)BAND] is the main dial. 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 20 will instruct you on how to set the tuning speed [TS] for 1 Hz resolution.

3. Adjust audio output

Adjust this control to a comfortable audio level.

AF	RF/SQL
Decreases	Increases
No audio output	Max. audio output

V

QUICK REFERENCE GUIDE

DWhat 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

Although your IC-703 will automatically select USB or

MODE

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.

Hint!

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

2. Reducing interference (some functions may require an optional unit depending on version)

Your IC-703 has many features to reduce QRM and QRN from the desired signal.

a.Noise Reduction: The noise reduction system on your IC-703 is part of the DSP. This is used to reduce the hiss and QRM levels.

qSelect S4 (DSP menu).

•Push [DISPLAY] once or twice to select S. •Push [MENU] one or more times to select S4.

wPush [(F-2)NR] to activate the noise reduction function.

•“DSP” and “NR” appear when the function is ON.

b.Adjusting the Noise Reduction: The noise reduction is completely variable on how much of the DSP Noise Reduction is used.

qPush [(F-3)NRL] to indicate the noise reduction level.

wRotate the [M-CH] control to set the noise reduction level.

ePush [(F-3)NRL] to exit the noise reduction level set mode.

Quick Reference

[MENU]

[(F-2)] [DISPLAY]

[M-CH]

[(F-3)]

USB

DSP

Appear

NR

			BLANK
S1 3 5 7 9	20	40 60dB	VFO A
PO	5	10	CH

S4 ANF NR NRL

Noise reduction ON

Noise reduction OFF

USB

DSP

NR

			BLANK
S1 3 5 7 9	20	40 60dB	VFO A
PO	5	10	CH

S4 LEVEL 4 NRL

Hint!

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

VI

QUICK REFERENCE GUIDE

c.Automatic Notch: The automatic notch will track up to 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 “ANF” on the display.

qSelect S4.

•Push [DISPLAY] once or twice to select S.

• Push [MENU] one or more times to select S4.

wPush [(F-1)ANF] to activate the automatic notch filter.

NOTE: Your IC-703 is equipped with an AGC cir-

cuit. This allows the DSP to filter out interfering sig-

nals and QRM, while also taking this interference

out of the AGC. Bottom line, this will either elimi-

nate or greatly reduce the pumping of the AGC from the interfering signal.

[(F-1)]

[MENU] [DISPLAY]

USB

DSP

Appear ANF

			BLANK
S1 3 5 7 9	20	40 60dB	VFO A
PO	5	10	CH

S4 ANF NR NRL

Hint!

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

d.Noise Blanker: The noise blanker function reduces pulse-type noise such as that generated by automobile ignition systems. This function is not effective for FM modes or for non pulse-type noise.

qSelect M3.

•Push [DISPLAY] once or twice to select M.

• Push [MENU] one or more times to select M3.

wPush [(F-2)NB] to activate the noise blanker.

•“NB” appears when the function is ON.

		[MENU]	[(F-2)] [DISPLAY]
		USB
Appears		NB			BLANK
		S1 3 5 7 9	20	40 60dB	VFO A
		PO	5	10	CH

M3 FIL NB MET

e.Adjusting the Noise Blanker: The noise blanker is completely variable on how much of the Noise Blanker is used.

qPush [(F-2)NB] for 1 sec. to enter the noise blanker level set mode.

wRotate the main dial to set the noise blanker level.

ePush [DISPLAY] to exit the noise blanker level set mode.

[DISPLAY]

[(F-2)]

Main dial

USB

N1 NB LEVEL

Hint!

When using the noise blanker, received signals may be distorted if the noise blanker level setting has been too high.

VII

QUICK REFERENCE GUIDE

f.Filter:

One optional filter can be installed in the IC-703.

Narrow filters help reject interference from adjacent signals and obtain good selectivity.

Wide filters provide improved audio for SSB operation when no interfering signals are present.

Narrow filters for AM/FM modes are standard.

FILTER PRESETTING:

After you install a filter (see p. 87 for installation), you

must specify the installed filter in initial set mode (item “22 OPT. FIL” ; see p. 79).

FILTER ON/OFF: qSelect M3.

•Push [DISPLAY] once or twice to select M.

• Push [MENU] one or more times to select M3.

wPush [(F-1)FIL] momentarily to select the narrow filter; push for 1 sec. to select the wide filter.

•ã appears when the narrow filter is selected; ç appears when the wide filter is selected.

NOTE: When selecting the narrow filter (or wide fil- ter), the graphic passband is changed (see dia- gram below).

wide is	Normal	narrow is
selected	operation	selected

[(F-1)]

[MENU] [DISPLAY]

N W		USB
				BLANK
S1	3	5 7 9 20	40 60dB	VFO A
PO		5	10	CH

M3 FIL NB MET

Either these

appears when selected

Quick Reference

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

VIII

QUICK REFERENCE GUIDE

■ Ready to call CQ?

[POWER]: OFF

[P.AMP/ATT]: OFF (indicator lights out)

[TUNER]: OFF (indicator lights out)

[RIT/SUB]: OFF (indicator lights out)

[SHIFT]: Center

							[AF]: Max. CCW
	AF	RF SQL			MODE	Y	CCW : counterclockwise
POWER						BAND
					TS
							[RF/SQL]: Center
P.AMP ATT
					RX
TUNER	RIT				TX
	SUB
	M-CH	SHIFT			DISPLAY
PHONES
					LOCK	BAND
		MENU F 1	F 2	F 3		Z

[LOCK]: OFF (indicator light out)

1. Setting up your Mic Gain

Microphone gain must be adjusted properly so that your signal does not distort when transmitted.

qSelect SSB or another phone mode (AM or FM mode).

wPush [DISPLAY] for 1 sec. to select quick set mode.

ePush [MENU] one or more times to select “Q2 MIC GAIN.”

•The ALC meter is selected automatically when operating in SSB mode.

rWhile speaking into the microphone, rotate the main dial to adjust the microphone gain so that the

ALC meter does not peak past the ALC zone.

•While transmitting at your normal voice level, the ALC meter should read at about the middle of the ALC zone.

• Be sure the mic gain is in the range of 2 to 5. tPush [DISPLAY] to exit quick set mode.

							[DISPLAY]
[MENU]							Main dial
			USB
S1	3	5	7	9	20	40	60dB

ALC

Q2 MIC GAIN

ALC

ALC zone

IX

QUICK REFERENCE GUIDE

2. Speech compressor

The IC-703 has a built-in, low distortion speech compressor circuit. This circuit increases your average talk power in SSB mode and is especially useful for DX’ing when the receiving station is having difficulty copying your signal.

qSelect USB or LSB mode.

wSelect the ALC meter.

•Push [DISPLAY] once or twice to select M.

•Push [MENU] one or more times to select M3, then push

[(F-3)MET] one or more times to select “ALC.” eSelect M4.

•Push [MENU] one more time to select M4.

rPush [(F-2)COM] to turn the speech compressor function ON.

•“COM” appears.

tPush [(F-2)COM] for 1 sec. to enter the compression level set mode (p. 54).

yRotate the main dial to set the speech compression level.

NOTE: When the ALC meter peaks at light the ALC zone, your transmitted voice may be distorted.

[(F-3)] [MENU] [(F-2)] [DISPLAY] Main dial

USB

S1

3

5

7

9

20

40

60dB

ALC

C1 COMP LEVEL

ALC

ALC zone

Hint!

Voice patterns and audio characteristics vary with each operator, therefore the Microphone gain, speech compression settings will be different for each operator. Actual on air experimenting is necessary to get just the right sound. It’s 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.

Quick Reference

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

X

1 PANEL DESCRIPTION

■Front panel

q		w e
		AF	RF SQL
	POWER
	P.AMP ATT
@2
@1	TUNER	RIT
		SUB
@0
		M-CH	SHIFT

PHONES

!9

		r	t y u i	o
			MODE	Y
USB				BAND
			TS
			RX
S1 3 5 7 9	20	40 60dB VFO A	TX
PO	5	10	CH	!0

M1 SPL A/B XFC DISPLAY

				LOCK
				BAND
MENU	F 1	F 2	F 3	Z

!8!7 !6 !5

!4

!3!2

qPOWER SWITCH [POWER] (p. 17)

While transceiver’s power is OFF: Push to turn power ON.

• Turn the DC power supply ON in advance.

While transceiver’s power is ON:

Push momentarily to indicate the connected power supply voltage.

Push for 1 sec. to turn power OFF.

wAF GAIN CONTROL [AF] (inner control; p. 17) Varies the audio output level from the speaker.

AF	RF/SQL
Decreases	Increases
No audio output	Max. audio output

eRF GAIN CONTROL/SQUELCH CONTROL [RF/SQL] (outer control; p. 24)

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 13 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 initial set mode as follows. (p. 79)

	MODE	SET MODE SETTING
		AUTO	SQL	RF GAIN + SQL
	SSB, CW	RF GAIN	SQL	RF GAIN + SQL
	RTTY
	AM, FM	SQL	SQL	RF GAIN + SQL

!1

• When setting as RF gain/squelch control

Noise squelch (FM mode)

Recommended level

Squelch is

open.

Maximum RF gain

RF gain
adjustable	S-meter
range	squelch

•When functioning as RF gain control

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

Maximum

RF gain

Adjustable range

Minimum RF gain

•When functioning as squelch control

(RF gain is fixed at maximum.)

Noise squelch (FM mode)

Noise squelch

threshold (FM mode)

S-meter squelch threshold

	Squelch is	S-meter
		squelch
	open.
	Shallow	Deep

1

rFUNCTION DISPLAY

Shows the operating frequency, dot matrix indications, selected memory channel, etc. See p. 9 for details.

tTUNING STEP SWITCH [TS] (pgs. 19–21)

While in SSB/CW/RTTY modes, push momentarily to turn the programmable tuning step ON and OFF. While in FM/AM mode push momentarily to toggle the programmable tuning step and 1 MHz quick tuning step.

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

Programmable tuning step indicator

USB

•0.01 (FM/AM mode only), 0.1, 1, 5, 9, 10, 12.5, 20, 25 and 100 kHz tuning steps are available.

•1 MHz quick tuning step are only available in FM and AM modes.

While the programmable tuning step is OFF, turns the 1 Hz step ON and OFF when pushed for 1 sec.

•1 and 10 Hz steps are only available in SSB, CW and RTTY modes.

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

While the programmable tuning step is ON, enters the tuning step selection mode when pushed for 1 sec.

yMODE SWITCH [MODE] (p. 23)

Push momentarily to cycle through the operating modes:

USB/LSB CW RTTY/SSB-D FM/AM

Push for 1 sec. to toggle the following operating modes:

USB LSB

CW Memory keyer mode RTTY SSB-D (SSB data mode) FM AM

uRECEIVE/TRANSMIT INDICATORS [RX]/[TX]

[RX]: Lights green while receiving a signal and when squelch is open.

[TX]: Lights red while transmitting.

iMAIN DIAL

Changes the displayed frequency, sets the values of selected initial set mode items, etc.

PANEL DESCRIPTION

1

oUP/DOWN (BAND) SWITCHES [Y/Z(BAND)]

Push momentarily to select a band.

•Can also be used to advance or back the quick set mode items, initial set mode items, etc.

Push and hold to scroll through the bands continuously.

!0MAIN DIAL TENSION LATCH

Selects the main dial tension.

• 2 positions are available.

!1MICROPHONE CONNECTOR (p. 10) Modular-type microphone connector—Accepts the supplied microphone (HM-103).

•The optional OPC-589 can be used to connect an 8-pin 1 microphone such as the SM-8 or SM-20, if desired.

•A microphone connector is also available on the rear panel. DO NOT connect 2 microphones simultaneously.

!2LOCK SWITCH [LOCK]

Push momentarily to toggle the dial lock function ON and OFF.

•The dial lock function electronically locks the main dial.

When the optional UT-102 VOICE SYNTHESIZER UNIT is installed (p. 86), push for 1 sec. to have the frequency, etc. announced.

•UT-102 operation can be adjusted in the initial set mode (p. 82).

LOCK

Lights while the lock function is activated.

!3DISPLAY SWITCH [DISPLAY] (p. 94)

Push momentarily to select one of the three menu sets: M1 to M4, S1 to S4 and G1 to G4.

Push for 1 sec. to enter the quick set mode.

!4MULTI-FUNCTION SWITCHES [F1] / [F2] / [F3]

Push to select the function indicated in the dot matrix display above these switches. (pgs. 4–6, 94)

• Functions vary depending on the menu set selected.

Push to edit a character for memory keyer programming or memory name. (pgs. 35, 59)

!5MENU SWITCH [MENU] (p. 94)

Push this switch one or more times to select menus within a menu set (M, S or G), or push to advance through the quick set mode and initial set mode displays.

Push for 1 sec. to jump between two different function menu sets.

2

1 PANEL DESCRIPTION

!6RIT/SUB DIAL SWITCH [RIT/SUB] (pgs. 21, 47)

Push to toggle the RIT or SUB DIAL function ON and OFF—initial set mode is used to select the desired action*.

•Lights green when the SUB DIAL function is ON; lights red when the RIT function is ON.

•Use the [M-CH] control to vary the RIT frequency or SUB DIAL frequency (see below).

When the RIT function is ON, push for 1 sec. to add or subtract the shifted frequency to the operating frequency.

RIT/

SUB

Lights red while the RIT function is activated; green while the SUB DIAL function is activated.

*Even if RIT is selected in initial set mode, RIT cannot be selected when operating AM or FM modes.

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-fre- quency or when you prefer to listen to slightly differentsounding voice characteristics, etc.

!7SHIFT CONTROL [SHIFT] (outer control; p. 47) Shifts the center frequency of the receiver’s IF passband.

•Rotate the control clockwise to shift the center frequency higher, or rotate the control counterclockwise to shift the center frequency lower.

•When rotate the control, the IF passband is graphically displayed and changes in accordance with the [SHIFT] control.

M-CH SHIFT M-CH SHIFT M-CH SHIFT

Shifts low

Center

Shifts high

!8M-CH CONTROL [M-CH] (inner control)

When the RIT or SUB DIAL functions are OFF, rotate to select a memory channel number (p. 56).

Shifts the receive frequency while the RIT function is ON in SSB, CW and RTTY modes (see above or p. 47).

• RIT variable range is ± 9.99 kHz

Changes the operating frequency in the selected tuning steps while the SUB DIAL function is ON (p. 21).

M-CH	SHIFT
Decreases	Increases

!9HEADPHONE JACK [PHONES] (p. 14) Accepts headphones with 8–16 Ω impedance.

•When headphones are connected, no receive audio comes from the speaker.

•When the PHONES/SPEAKER switch on the back of the front panel is set to the [SPEAKER] position, an external speaker can be connected. This is convenient for mobile or outdoor operation.

Back of the front panel

PHONES ∫	PHONES ∫
SPEAKER √

SPEAKER √

@0TUNER SWITCH [TUNER] (pgs. 64–66)

Push momentarily to toggle the automatic antenna tuner function ON and OFF (bypass).

•Lights red when the automatic antenna function is ON.

Push this switch for 1 sec. to manually tune the antenna.

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

TUNER

Lights while the automatic tuning function is activated.

@1FRONT PANEL LATCH (p. 12)

Pull away from the transceiver (towards yourself when looking at the front of the transceiver) to detach the front panel from the main body of the transceiver.

@2PRE AMP/ATTENUATOR SWITCH [P.AMP/ATT]

(p. 46)

Push momentarily to turn the preamp ON or OFF.

Push for 1 sec. to turn the 20 dB attenuator ON;

push momentarily to turn the attenuator OFF.

•Lights green when the preamp is ON; lights red when the 20 dB attenuator is ON.

P.AMP/ATT

Lights green while the preamp is activated; lights red while the attenuator is activated.

What is the preamp?

The preamp amplifies received signals in the front end circuit to improve the S/N ratio and sensitivity. Turn ON ‘P.AMP’ 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.

3

■Multi-function switches

DM1 functions

M1	SPL	A/B	XFC
MENU	F-1	F-2	F-3

SPLIT OPERATION (p. 30)

SPL Push momentarily to toggle the split function ON and OFF. (p. 51)

F-1	• “ä”appears when the split function is ON.

Push for 1 sec. to turn the quick split function ON. (p. 52)

•The offset frequency must be programmed in advance using initial set mode. (p. 80)

•The offset frequency is shifted from the displayed frequency.

•The quick split function can be turned OFF using initial set mode. (p. 79)

VFO A/B SELECTION

A/B Push momentarily to toggle VFO A and VFO B in VFO mode. (p. 18)

F-2 Push momentarily to toggle the transmission VFO and reception VFO during split operation. (p. 51)

Push momentarily to toggle the transmit and receive frequencies (and modes) of memory channels when the split function is turned ON.

Push for 1 sec. to equalize the frequency and operatingmode of the two VFO’s.

•The rear (undisplayed) frequency and operating mode are equalized to the front (displayed) VFO frequency and operating mode.

TRANSMIT FREQUENCY CHECK (p. 51)

	XFC	Monitors the transmit frequency when
	F-3	pushed and held.
		•While pushing this switch, the transmit fre-
		quency can be changed with the main dial.

PANEL DESCRIPTION

1

DM2 functions

M2	MW	MCL	V/M
MENU	F-1	F-2	F-3
MEMORY WRITE (p. 57)
MW	Push for 1 sec. to store the selected read-
F-1	out frequency and operating mode into
	the displayed memory channel.
MEMORY CLEAR (p. 58)					1
MCL	Push for 1 sec. to clear the selected read-
	out memory channel contents.

F-2	• “}” appears.

•This switch does not function in VFO mode.

VFO/MEMORY

V/M Push momentarily to toggle between VFO and memory modes. (p. 56)

F-3 Push for 1 sec. to transfer the frequency and operating mode in the selected memory channel to a VFO. (p. 58)

DM3 functions

M3 FIL NB MET

MENU

F-1

F-2

F-3

FILTER SELECTION (p. 49)

	FIL	Push to toggle the narrow filter (or wide
	F-1	filter—push for 1 sec.) ON and OFF.
		•“ã”appears when the narrow filter is ON;
		“ç” appears when the wide filter is ON.
		•An optional filter installation and presetting in
		initial set mode (p. 79) is necessary to use
		the following:
		CW/RTTY narrow: FL-52A or FL-53A
		SSB narrow: FL-222
		SSB wide: FL-257
	NOISE BLANKER (p. 48)
	NB	Push momentarily to toggle the noise
		blanker ON and OFF.

F-2	•“NB” appears when the noise blanker func-
	tion is ON.
	•The noise blanker does not function in FM
	mode; “30 AM NB” item (p. 80) in initial set
	mode must be set to ON for the noise
	blanker to work in AM mode.
	Push for 1 sec. to enter the noise blanker
	level set mode.
	•The noise blanker level can be set in noise
	blanker level set mode (p. 46).

4

1 PANEL DESCRIPTION

METER SELECTION (p. 52)

	MET	Selects the type of meter displayed (dur-
	F-3	ing transmit) in the function display.
		•Power, ALC or SWR metering can be se-
		lected.
		•Only an S-meter is available for receive.

DM4 functions

DURING SSB/AM OPERATION:

M4 VOX COM AGC

MENU

F-1

F-2

F-3

DURING CW OPERATION:

M4 1/4 KEY AGC

MENU

F-1

F-2

F-3

DURING RTTY OPERATION:

M4 1/4 TON AGC

MENU

F-1

F-2

F-3

DURING SSB-D OPERATION:

M4	1/4		AGC
MENU	F-1	F-2	F-3

DURING FM OPERATION:

M4 VOX TON

MENU

F-1

F-2

F-3

VOX FUNCTION (p. 53)

VOX Push momentarily to toggle the VOX function ON and OFF.

F-1	•“VOX” appears when the VOX function is

ON.

Push for 1 sec. to enter the VOX set mode.

•The VOX delay, VOX gain and ANTI-VOX can be set in VOX set mode.

What is the VOX function?

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

SPEECH COMPRESSOR (p. 54)

COM Push momentarily to toggle the speech compressor ON and OFF.

F-2	•“COM” appears when the speech compres-

sor is ON.

Push for 1 sec. to enter the compression level set mode.

AGC (p. 48)

AGC

F-3

•The COMP gain can be set in compression level set mode.

Push to change the time constant of the AGC circuit.

•“FAGC” appears when the fast time constant is selected.

1/4 FUNCTION

1/4	Push to toggle the 1/4 tuning function ON
F-1	and OFF.
	•When the 1⁄4 function is ON, a bar appears
	under the 1⁄4 indication and fine tuning can be
	used.
KEYER SET MODE (p. 32)
KEY	Push for 1 sec. to enter the keyer set
	mode.

F-2	•The break-in setting, break-in delay time, CW
	pitch, CW paddle type and dot/dash ratio can
	be set in the keyer set mode.

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.

RTTY TONE SET MODE (p. 40)

	TON	Push for 1 sec. to enter the RTTY tone set
	F-2	mode.
		•The RTTY tone frequency, RTTY shift fre-
		quency and RTTY keying polarity can be set
		in RTTY tone set mode.
	FM TONE OPERATION
	TON	Push momentarily to select the subaudi-
		ble tone encoder for repeater use, tone
	F-2	squelch function and OFF. (pgs. 43–45)

•“T” appears when the repeater tone function is ON. (pgs. 43, 45)

•“TSQL” appears when the tone squelch function is ON. (p. 43)

Push for 1 sec. to enter the FM tone set mode. (p. 44)

•The repeater tone frequency, tone squelch frequency can be set in FM tone set mode.

5

DS1 functions

S1	MW	MPW	MPR
MENU	F-1	F-2	F-3
MEMORY WRITE (p. 57)
MW	Push for 1 sec. to store the selected
F-1	readout frequency and operating mode
	into the displayed memory channel.
MEMO PAD WRITE (p. 60)
MPW	Push to store the the selected readout
F-2	frequency and operating mode into a
	memo pad.
MEMO PAD READ (p. 60)
MPR	Push to call up a memo pad.
F-3

DS2 functions

DURING VFO MODE:

S2 SCN PRI V/M

MENU

F-1

F-2

F-3

DURING MEMORY MODE:

S2 SCN SEL V/M

MENU

F-1

F-2

F-3

SCAN (pgs. 61–63)

SCN	Push to start or stop the scan function.
F-1
PRIORITY WATCH (p. 63)
PRI	Push to start or stop the priority watch.
F-2

VFO/MEMORY

V/M Push momentarily to toggle between VFO and memory modes. (p. 56)

F-3 Push for 1 sec. to transfer the frequency and operating mode in the selected memory channel to a VFO. (p. 58)

SELECT SCAN (p. 61)

SEL	Push to toggle the select setting ON and
F-2	OFF for the selected memory channel.

PANEL DESCRIPTION

1

DS3 functions

S3 7 14 21

MENU

F-1

F-2

F-3

QUICK BAND CHANGE FUNCTION (p. 22)

This item provides access to the band stacking register. By default the 7, 14 and 21 MHz bands are displayed. Push [F-1], [F-2] or [F-3] for 1 sec. to select a new band if desired.

•A mode is memorized along with the frequency for each

band.

1

DS4 functions

(UT-106 is required for some version)

S4 ANF NR NRL

MENU

F-1

F-2

F-3

AUTOMATIC NOTCH FILTER (p. 50)

	ANF	This function automatically attenuates
	F-1	beat tones, tuning signals, etc., even if
		they are moving.
	NOISE REDUCTION (p. 50)
	NR	This function reduces noise components
		and picks out desired signals which are
	F-2
		buried in the noise.
	NOISE REDUCTION LEVEL DISPLAY (p. 50)
	NRL	This switch displays the noise reduction
	F-3	level when pushed.

6

1 PANEL DESCRIPTION

■Rear panel

e	r	t y	u	i
w
q
		!0		o

qANTENNA CONNECTOR [ANT] (p. 13)

Accepts a 50 Ω antenna with a PL-259 connector.

wGROUND TERMINAL [GND] (p. 11)

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

eDATA SOCKET [DATA] (pgs. 8, 14)

6-pin min DIN socket to connect a TNC (Terminal Node Controller), etc. for packet operation.

•See page at right for socket information.

rACCESSORY SOCKET [ACC] (pgs. 8, 14) Enables connection to external equipment such as a TNC for data communications, a linear amplifier or an automatic antenna selector/tuner, etc.

•See page at right for socket information.

tEXTERNAL SPEAKER JACK [EXT SP] (p. 14) Accepts a 4–8 Ω speaker.

yCI-V REMOTE CONTROL JACK [REMOTE] (p. 71)

Designed for use with a personal computer for remote control of the transceiver functions.

Used for transceiver operation with another Icom CI-V transceiver or receiver.

uMICROPHONE CONNECTOR [MIC] (p. 13) Accepts the supplied microphone (connected in parallel with the front panel’s [MIC] connector).

•See p. 2 for microphone notes.

•See p. 10 for microphone connector information.

iELECTRONIC KEYER JACK [KEY] (p. 28) Accepts a paddle to activate the internal electronic keyer.

•Selection between the internal electronic keyer and straight key operation can be made in keyer set mode. (p. 32)

( )

When connecting a straight key

		(dot)
	When connecting	(com)
		(dash)
	a paddle

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.

oTUNER CONTROL SOCKET [TUNER] (p. 14) Accepts the control cable from an optional AH-4

HF/50 MHz AUTOMATIC ANTENNA TUNER.

!0DC POWER SOCKET [DC13.8V] (p. 15)

Accepts 9.0–15.87 V DC through the supplied DC power cable.

NOTE: DO NOT use a cigarette lighter socket as a

power source when operating in a vehicle. The plug

may cause voltage drops and ignition noise may be superimposed onto transmit or receive audio.

7

PANEL DESCRIPTION

1

DDATA socket

DATA

PIN No.

NAME

DESCRIPTION

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.

6

5

3

PTT P

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

4

DATA OUT

Data out terminal for 9600 bps operation only.

4

3

2

1

5

AF OUT

Data out terminal for 1200 bps operation only.

Rear panel view

Squelch out terminal. Becomes ground level when the transceiver receives a signal

which opens the squelch.

6

SQ

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

1

mission when receiving signals.

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

DACC socket

ACC

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

Connects to ground.

———

Input/output pin. (HF/50 MHz only)

Ground level

: –0.5 V to 0.8 V

3

HSEND

Goes to ground when transmitting.

Output current

: Less than 20 mA

When grounded, transmits.

Input current (Tx)

: Less than 200 mA

4

BDT

Data line for the optional AT-180.

———

4

3

2

1

Band voltage output.

8

7

6

5

5

BAND

Output voltage

: 0 to 8.0 V

12

11

10

9

(Varies with amateur band)

13

6

ALC

ALC voltage input.

Control voltage

: –4 V to 0 V

Rear panel view

Input impedance

: More than 10 kΩ

q brown

i gray

7

NC

———

———

w red

o white

8

13.8 V

13.8 V output when power is ON.

Output current

: Max. 1 A

e orange !0black

9

TKEY

Key line for the optional AT-180.

———

r yellow

!1pink

t green

!2light

“High” level

: More than 2.4 V

y blue

blue

u purple

!3light

10

FSKK

Controls RTTY keying

“Low” level

: Less than 0.6 V

green

Output current

: Less than 2 mA

11

MOD

Modulator input.

Input impedance

: 10 kΩ

Connects to a modulator.

Input level

: Approx. 100 mV rms

AF detector output.

Output impedance

: 4.7 kΩ

12

AF

Fixed, regardless of [AF] position in

default settings.

Output level

: 100–300 mV rms

13

SQLS

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

Color refers to the cable strands of the supplied cable.

• When connecting the ACC conversion cable (OPC-599)

					ACC 1		q FSKK	t AF	ACC 2		q 8 V	t ALC
	4	3	2	1	7	6			7	6
	8	7	6	5		8	w GND	y SQLS			w GND	y VSEND
					3	1			3	1
	12	11	10	9	5	4	e HSEND	u 13.8 V	5	4	e HSEND	u 13.8 V
			13			2	r MOD	i ALC		2
											r BAND

Connect to ACC socket

8

1 PANEL DESCRIPTION

■Function display

q w e

rb

N W

LSB USB CW

R RTTY AM

FM

TSQL SPL

ra

DSP

!3

ANF

t

NR

!2

NB VOX F-BK COM FAGC

VFO A

BLANK

u y

S1

3

5

7 9

20 40

60dB

i

!1

ALC

∞

VFO B

S

SWR PO 1

1.5

2

3 5

10

MEMO

CH

o

M1 SPL A/B XFC

!0

qNARROW/WIDE FILTER INDICATORS

“ã” appears when selecting AM narrow or FM narrow modes.

When installing an optional narrow filter, narrow mode can be selected in CW, RTTY and SSB modes.

•When the SSB wide filter is installed, “ç” appears during wide mode selection.

wMODE INDICATORS

Show the selected operating mode.

•“å” appears when CW reverse or RTTY reverse mode is selected.

eSPLIT INDICATOR

Appears during split operation.

rPROGRAMMABLE/1 MHz TUNING STEP INDICATORS

ra appears when the programmable tuning step is selected.

rb appears when the 1 MHz quick tuning step is selected.

tFREQUENCY READOUT

Shows the operating frequency.

yBLANK MEMORY INDICATOR

Appears when the displayed memory channel is not programmed (blank channel).

• This indicator appears both in VFO and memory modes.

uVFO/MEMORY INDICATORS

VFO A or B appears when VFO mode is selected; MEMO appears when memory mode is selected.

iSELECT MEMORY CHANNEL INDICATOR

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

oMEMORY CHANNEL READOUT

Shows the selected memory channel.

!0DOT MATRIX INDICATORS

These alphanumeric readouts show a variety of information such as current functions of the “F” keys [F1] to [F3], memory channel names, set mode items, etc. See p. 94 for an overview of these indicators.

!1METER READOUTS

Shows receiving signal strength while receiving.

Shows one of transmit power meter, ALC or SWR meter while transmitting.

!2FUNCTION INDICATORS

“NB” appears when the noise blanker is activated.

“VOX” appears when the VOX function is selected.

“F-BK” appears when full break-in operation is selected and only “BK” appears when semi breakin operation is selected.

“COM” appears when the speech compressor is activated.

“FAGC” appears when the fast AGC function is selected.

!3DSP INDICATORS

Appear when the (optional*) DSP unit UT-106 is (installed and) activated.

* UT-106 DSP unit is optional for some version.

9

■Microphone (HM-103)

q

LOCK

DN UP

OFF ON

w

qUP/DOWN SWITCHES [UP]/[DN]

Change the operating frequency.

•Push and hold to change the frequency continuously. •Tuning step is 50 Hz when no TS indicator appears.

PANEL DESCRIPTION

1

e

1

wLOCK SWITCH [LOCK]

Locks the [UP]/[DN] switches.

ePTT SWITCH [PTT]

Push and hold to transmit; release to receive.

TECHNICAL INFORMATION

• MICROPHONE CONNECTOR

Rear panel view

87654321

q +8 V DC output

w Frequency up/down e AF output

r PTT

t GND (Microphone ground) y Microphone input

u GND

iSquelch switch

•HM-103 SCHEMATIC DIAGRAM

	PIN NO.	FUNCTION	DESCRIPTION
	1	+8 V DC output	Max. 10 mA
	2	Frequency up	Ground
		Frequency down	Ground through 470 Ω
	8	Squelch open	“LOW” level
		Squelch closed	“HIGH” level

CAUTION: DO NOT short pin 1 to ground as this can damage the internal 8 V regulator.

MICROPHONE 2k			MICROPHONE PLUG
			MICROPHONE
10	+	4700p	CABLE
MIC		0.33 +
ELEMENT
		4700p	1 2345678
		2.2k
		LOCK	DOWN UP
PTT	RECEIVE		470

TRANSMIT

10

2 INSTALLATION AND CONNECTIONS

■ Unpacking

■ Antenna connection

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-703, 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. (see description at right page)

■ 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.

RWARNING: NEVER connect the [GND] ter-

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

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.

CAUTION: Protect your transceiver from lightning by using a lightning arrestor.

PL-259 CONNECTOR INSTALLATION EXAMPLE

q

Coupling ring

w

e

r

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.

Screw the coupling ring onto the connector body.

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-703 has an SWR meter to monitor the antenna SWR continuously.

11

■Installation

DSingle body mounting

Spring washer

Nut MB-62

(optional)

Supplied with the MB-62*

Flat washer

*CAUTION: Non-supplied screws (longer than 8 mm) may damage the internal units.

INSTALLATION AND CONNECTIONS

2

DStand

To raise the stand:

With the transceiver upside down, pull the stand towards the rear panel and then upwards, as illustrated below.

then up

Pull back

2

DFront panel separation

qWhile pulling the panel release button towards you, slide the front panel to the right (fig. 1).

wAttach the optional OPC-581 to the main body and tighten the supplied screw as in fig. 2.

eAttach the other end of the OPC-581 to the detached front panel as in fig. 3.

fig. 1

fig. 2

CAUTION: NEVER detach/attach the front panel

when connecting the DC power supply (or battery).

Make sure the disconnecting DC power cable from the [13.8 V] receptacle on the transceiver rear panel.

fig. 3

Separation cable

Latch	Separation cable

DFront panel mounting

	qAttach the MB-63 to a flat surface using the two	fig. 1
	supplied screws (fig. 1).

wFix the detached front panel to the MB-63 as illustrated in fig. 2.

BE CAREFUL of the orientation of the MB-63, otherwise, the front panel may become attached in the

opposite direction.	fig. 2

12

2 INSTALLATION AND CONNECTIONS

■Required connections

	AF	RF SQL			MODE
POWER					TS
P.AMP ATT
					RX
TUNER	RIT				TX
	SUB
	M-CH	SHIFT			DISPLAY
PHONES
					LOCK
		MENU	F 1	F 2	F 3

GROUND (p. 11)

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

Grounding prevents electrical shocks, TVI and other problems.

HF/50 MHz ANTENNA

Y

BAND

BAND

Z

MICROPHONE (p. 10)

HM-103

CW KEY (p. 28)

Connects to DC 9.0–15.8 V power supply. See p. 15 for details.

13

INSTALLATION AND CONNECTIONS

2

■Advanced connections

AF RF SQL	MODE	Y

BAND

POWER		TS
P.AMP ATT
		RX
TUNER	RIT	TX
	SUB
	M-CH SHIFT	DISPLAY

PHONES

LOCK

BAND

MENU

F 1

F 2

F 3

Z

HEADPHONES

SPEAKER

or

Selectable with the [PHONE/SPEAKER] switch on the back of the front panel.

ACC SOCKET (p. 8)

DATA SOCKET (p. 8)

6-pin mini DIN socket to connect to a TNC, etc. for packet operation.

OPC-589 (p. 92)

2

EXTERNAL

SPEAKER (p. 91)

SM-20

SP-7/SP-10

DESKTOP (p. 91)

MICROPHONE

	AH-4	(p. 16)	REMOTE (p. 71)
AH-2b			Used for computer control
			and transceive operation.

14

2 INSTALLATION AND CONNECTIONS

■DC Power voltage

Depending on the applied voltage from the connected	when the voltage reaches 11.5 V. This 0.5 V voltage
power supply, a boarder voltage of 11.0 V is set as the	difference prevents irregular switching between nor-
point where the IC-703 switches between normal op-	mal mode and battery mode, caused by the voltage
erating mode (over 11.0 V), and battery operating	drop which are current capacity, receiving or transmit-
mode (under 11.0 V: power save mode).	ting.
However when the connected voltage decreases from	When 11.3 V voltage is applied, the IC-703 may acti-
13.8 V to 11.0V, the IC-703 switches from normal	vate the battery operating mode depending on the
mode to battery mode. Conversely the IC-703	current capacity of the power supply.
switches back to normal mode from battery mode
■DC Power supply connections

Use a 13.8 V DC power supply with at least 3 A capacity. when operating IC-703 with AC power. Refer to the diagram below for connection.

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 9.0–15.8 V

when you use a non-Icom power supply.

•DC power cable polarity is correct.

Red: positive (+) terminal, Black: negative (–) terminal

CONNECTING PS-125 DC POWER SUPPLY

CONNECTING A DC POWER SUPPLY

PS-125	Transceiver
Ground	Optional	to DC power
		receptacle
	OPC-1248

Connect to an AC	DC power cable
outlet using the
supplied AC cable.

*13.8 V; at least 3.0 A continuous AC

outlet

A DC power supply*

Black Red

_+

Supplied	AC cable
OPC-1229
4 A fuses

■Battery connections

• RWARNING NEVER connect to a battery	• DO NOT use the cigarette lighter socket for power
without supplied DC fuse, otherwise a fire hazard		connections. (See p. 7 for details)
occur.	• Attach a rubber grommet when passing the DC
• NEVER connect the transceiver directly to a		power cable through a metal plate to prevent a
24 V battery.		short circuit.
CONNECTING A VEHICLE BATTERY
		Note: Use terminals for
		the cable connections.
	black	red
		Crimp
Grommet
		Solder
	12 V
	battery
		Supplied
		DC power cable

15