Kenwood TM-441A User Manual

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144MHz FM TRANSCEIVER

TM-241A/241E

430/440MHZ FM TRANSCEIVER

TM-441A/441E

1200MHz FM TRANSCEIVER

TM-541A/541E

INSTRUCTION MANUAL

KENWOOD CORPORATION

©PRINTED IN JAPAN B62-0031-00(T) 91/12 1110 9 8 7

Thank you for purchasing this new transceiver.

NOTE:

IMPORTANT:

Please read this instruction manual carefully before placing your transceiver in service.

SAVE THIS INSTRUCTION MANUAL.

CAUTION:

Long transmission or extended operation in the HI power mode might cause the rear of this transceiver to get warm. Do not place the transceiver where the heat sink (rear panel) might come in contact with plastic or vinyl surfaces.

This instruction Manual covers the following models. TM-241A:

TM-241E: TM-441A: TM-441A: TM-441E: TM-541A: TM-541E:

144MHz FM TRANSCEIVER

(U.S.A. and general markets)

144MHz FM TRANSCEIVER (U.K. and European markets) 440MHz FM TRANSCEIVER (U.S.A. only) 430MHz FM TRANSCEIVER (General markets) 430MHz FM TRANSCEIVER (U.K. and European markets)

1200MHz FM TRANSCEIVER (U.S.A. only)

1200MHz FM TRANSCEIVER (European markets)

If disregarded, inconvenience only, no risk of

equipment damage or personal injury.

CAUTION:

Equipment damage may occur, but not personal injury.

FCC WARNING This equipment generates or uses radio frequency

energy. Changes or modifications to this equipment may cause harmful interference unless the modifications are expressly approved in the instruction manual. The user could lose the authority to operate this equipment if an unauthorized change or modification is made.

CONTENTS

1. BEFORE OPERATION ..................................... 4

2. SPECIFICATIONS ............................................ 6

3. ACCESSORIES ................................................ 7

4. INSTALLATION INSTRUCTIONS

5. OPERATION CONTROL FUNCTIONS RECEIVER OPERATION

Reception ...................................................... 16

Frequency Selection ..................................... 17

Frequency Step Selection Programmable VFO Tuning Limits ALT(TM-541A/Eonly)

TRANSMITTER OPERATION

Time-out Timer (TOT) ................................... 20

MEMORY

Microprocessor Memory back-up

Initial State .................................................... 21

Microprocessor Initialization ......................... 21

Memory Channel Memory Contents Memory Entry Memory Channel Recall

Memory Shift ................................................. 24

SCAN

Scan Operation

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17 18 19 20

21 22 22

Hold/Resume Programming ......................... 25

Band Scan .................................................... 26

Programmable Band Scan

Memory Channel Scan ................................. 27

Memory Channel Lockout Priority Alert Function

REPEATER OPERATIONS

Transmitter Offsets Reverse Function

Tone Operation ............................................. 29

Tone Frequency Selection

Autopatch (U.S.A. version only) TONE / CTCSS OPERATION DTSS (Dual Tone Squelch System) OPERATION DRS (Digital Recording System)

OPERATION ................................................... 34

PAGING TONE ALERT SYSTEM

APO (Automatic Power Off) ............................ 48

DIM(Dimmer) .................................................. 48

BEEP............................................................... 49

LOCK/A.LOCK ................................................ 49

6. BLOCK DIAGRAM and SCHEMATIC DIAGRAM Another sheet

7. MAINTENANCE

IN CASE OF DIFFICULTY

8. OPTIONAL ACCESSORIES

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26 27

28 28

29 29

30 30

50 51

AWARNING BEFORE OPERATION

TO PREVENT ELECTRIC SHOCK, FIRE AND OTHER

INJURY. PLEASE NOTE THE FOLLOWINGS:

To avoid risk of electric shock,under no circumstances

Do not place this unit,where it will be exposed to direct sunlight or close to heating appliances.

To ensure good ventilation, do not put anything on top of the cabinet and allow at least 15 cm (6 inches) of space behind the unit.

The power requirement is 13.8 VDC. Never attempt connection to a 24 VDC source.

Do not place the unit in areas off excessive dust, high humidity or on unstable surfaces.

Do not drop pieces of metal, needles, coins and other

electrically conductive materials into the unit.

Do not touch the power plug, when your hands are wet.

Do not pull the power cord, when disconnecting it from the AC wall outlet. Grasp the plug and ensure that your fingers do not touch the live pins.

If an abnormal odor or smoke is detected, immediately turn the power off and pull out the power plug. Contact the KENWOOD service station or our dealer.

CLEANING

1. Turn the power off, before cleaning the unit.

2. Do not use any type of abrasive pad, thinner, benzine or any substances which may damage the unit.

3. Wipe the front panel and other exterior surfaces of the unit with a soft dry cloth or a soft cloth lightly moistened with water.

2 SPECIFICATIONS

TM-241A(U.S.A) TM-241A/E TM-441A(U.S.A) Frequency range MHz Mode Antenna impedance Operating temperature

Power requirements

Ground

Current drain Frequency stability

Dimensions (WXHXD) (mm) (Projections included)140 X 40 X 160(5-1/2” X1-37/64"X6-19/64") ( 140 X 40 X172(5-1/2"X1-37/64"X6-25/32") Weight (kg) 1.2(2.65lbs)

Output power *

Modulation

Spurious radiation

Maximum frequency deviation

Audio distortion (at 60% modulation) Less than 3% (300 to 3000 Hz)

Microphone impedance

Circuity

Intermediate frequency lst/2nd

Sensitivity (12dBSINAD)

Selectivity

Squelch sensitivity Less than 0.1 jzV

Output (5% distortion)

External speaker impedance 80

'Jotes

2.* Recommended duty cycle :1 minute; Transmit,3 minutes Reception

Transmit mode Receiver mode

HI 50W 35W

MID Approx low

LOW Approx. 5W

144 to 148 144 to 146

Less than llA

10.7MHz / 455kHz

—6dB: More than 12 kHz —60dB Less than 24 kHz

438 to 450 430 to 440 430 to 440

-20°Cto +60”C (-4°Fto +140°F)

13.8V DC±15%(11.7~15SV)

Less than 0.6A

Less than ±10 ppm

Reactance modulation

Less than — 60 dB

Double conversion superheterodyne

Less than 0.16 //V

More than 2 W across 8 0 loads

TM441A

F3E(FM)

50Q

Negative

Less than lOA

Approx low

Approx. 5W

±5KHz

6000

30.825MHz / 455kHz

Less than 0.177 jaV

TM441E TM-541A/E

1240 to 1300

Less than 6A

Less than±3ppm

low

59.7MHz/455kHz

Less than 0.1 juV

3 ACCESSORIES

Unpack your new transceiver carefully, and examine it for visible damage If the equipment has been damaged in shipment, notify the transportation company immediately. Save the boxes and packing material for future shipping. The following accessories should be included in the box with the transceiver.

DTMF Microphone (U.S.A. CANADA only) or Dynamic Microphone (GENERAL market only) or Dynamic Microphone (EUROPE market only) Microphone Hook (U.S.A. CANADA only) Mobile Mounting Kit

Bracket Screw set Self tapping Screw (U.S.A. CANADA only) ... N46-3010-46 2 ea.

Hex wrench Stacking plate (TM-441A/441E/541A/541E).. J21-4147-14 2 ea.

DC power Cable

Fuse (TM-241A/241E: 15A).. F05-1531-05 1 ea.

(TM-441A/441E: lOA).. F05-1031-05 1 ea. (TM-541A/541E: 8A) ... F05-8021-05 1 ea.

Instruction Manual ....................... B62-0031-XX 1 copy

Warranty Card ..................................................... 1 ea.

(U.S.A., CANADA , EUROPE market s only)

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T91-0380-X5 1 ea.

T91-0379-X5 1 ea.

T91-0382-X5 1 ea. J20-0319-24 1 ea. J29-0436-03 1 ea.

N99-0331-05 1 ea.

WOl-0414-041 ea.

E30-2111-05 1 ea.

4 INSTALLATION INSTRUCTIONS

4-1 INSTALLATION Mounting Bracket

When installing the transceiver in a vehicle consider the

ease of operation and safety when selecting the

location for the mounting bracket.

1. Install the bracket using the supplied flat washers and self tapping screws ( 4 pcs.each).

2. Attach the transceiver loosely using the 4 SEMS screws.

3. Align the grooves in the bracket with the transceiver’s screws ( Fig. A) and slide the transceiver to the rear.

4. Adjust the viewing angle in the bracket to the desired position ( Fig. B).

5. Hold the transceiver in place and tighten the 4 SEMS screws using the supplied wrench.

4-2 CONNECTION 4-2-1 Mobile Installations

Cautions :

1. Before installing the power cable, be sure to remove the negative lead from the battery for safety.

2. After installation and wiring, be sure to double check for correct installation before reconnecting the negative lead to the battery terminal.

3. If the fuse opens, be sure to check that each conductor has not been damaged by short circuiting, etc. Then replace with a new fuse of the same rating.

4. After completing the wiring, wrap the fuse holder with heat resistant tape to protect against heat and moisture.

5. Do not remove the fuse even if the power cable is too long.

A. Battery Connections

Connect the power cable directly to the battery terminals. Using of the cigarette lighter socket will lead to a poor connection, and will result in poor performance. Pay close attention to the polarity of the cables when connecting them to the battery.

Make sure the positive (+) and negative (—) lead polarity is correct w/hen connecting to the battery.

Engine compartment-

Fuse

Select a location where the power cable is pro tected from heat, mois

Battery

If the wiring hole in the fire wall or chassis is too small, disas semble the fuse holder to thread the wire through the hole.

ture or abrasion when securing the cable.

Passenger compartment

^ Make sure the cable does

Chassis or fire wall

From passenger compartment

(№===

Thread like this

To the

, transceiver

not directiv contact the e^ of the hole by usir>g a grommet.

B. Ignition Noise

This transceiver has been designed to suppress ignition noise; however, if excessive noise is present, it may be necessary to use suppressor spark plugs (with resistors).

4-2-2 Fixed Station

4-2-3 Antenna

A regulated DC power supply (13.8 VDC capable of supplying at least 11 Amperes) is required. The PS-430 or the PS-50 are recommended.

1. Never connect the AC power cable to the AC outlet until all other connections have been made.

2. Before connecting and disconnecting the power connector, be sure to turn OFF the POWER switches of both the transceiver and the DC power supply.

3. Observe polarity of the DC power cable. The transceiver operates on 13.8 VDC, negative ground. Battery polarity must be correct. The power cable is color coded :

Red + (Positive polarity) Black -> — (Negative polarity)

The type of antenna that is used will greatly affect the

performance of the transceiver. Use a properly adjusted antenna, of good quality, to enable your transceiver to perform at its best. The antenna input impedance is 50

ohms. Use 50-ohm coaxial cable such as RG-8U or 8D-2V for this connection. If the antenna is far from the transceiver the use of low loss coaxial cable, such as RG-

8U is recommended. Match the impedance of the coaxial cable and that of the antenna so that the SWR is

less than 1.5 to 1. The protection circuit in the

transceiver will activate if the SWR is particularly poor

(greater than 3 to 1).

High SWR values will cause the transmitter output to

drop, and may lead to TVI or BCI reports.

Caution : We recommend that you install a high quality

lightening arrestor in your antenna lines for protection against fire,electric shock,personal

injury,or damage to the radio itself.

5 OPERATION

511 CONTROL FUNCTIONS

AL CTCaS

‘188.8.8.8.8.5 f ss

TM-241A

(1) POWER switch

Press to turn the transceiver on or off. Press the VFO/M^V or MR/M key and switching the power on will reset the VFO or MEMORY, The microphone PF key can be programmed when the power is switched on.

(2) Tuning control

This control is used to select the desired transmitter/receiver frequency, MHz step, memory channel, frequency step, tone frequency, scan direction, etc.

(DVOL control

This control is used to adjust the volume from the internal and external speaker (if used). Clockwise rotation will increase the volume and counterclockwise rotation will decrease the volume.

(i)SQL (Squelch) control

This control is used to select the desired squelch threshold level.

(DLOW/DIM key

LOW This function is used to select the transmit output power level (HI, MID(Except TM-541A/E), or LOW). DIM This function is used to select the intensity of the front panel display illumination. (See page 48) Pressing the F key for longer than 1 second and then press the LOW/DIM key while the F indicator is flash ing will turn the time-out timer function on and off.

(§) Microphone connector

Attach the supplied microphone to this connector. The pin out of the connector is shown in the accompanying illustration.

® GND (Microphone audio!

, ® RX Audio Output

(Approx 100 mV/10 k ohm)

(D 8 VDC (Max 150 mA)

®VFO/M^V key

This key is used to return to VFO operation after

operating in the MR or CALL channel mode. Pressing this key will allow the tuning control and microphone UP/DWN keys to increase or decrease

the operating frequency.

Press and hold the key for longer than 1 second to initiate VFO scan. Pressing the key after scan has been initiated will cause scan to stop.

Pressing the key within 10 seconds of pressing the F key will copy the memory channel or call channel data to the VFO. This allows you to change parameters of that channel without actually changing the data that has been stored in memory.

Pressing the F key for longer than 1 second and then pressing the VFO key will cause radio to toggle the hold / resume mode between Time Operated scan

and Carrier Operated scan.

If you press and hold the VFO key while you turn on the POWER switch you will reset the

microprocessor’s VFO memory, without destroying the memory channel or call channel data.

(D MR/M key

This key is used to select MR (Memory Recall) mode from the VFO mode. The tuning control can then be used to select the desired Memory channel.

Pressing the key for longer than 1 second will initiate memory channel scanning.

Pressing the key within 10 seconds of pressing the F key will store the displayed data into memory. In the MR channel mode pressing the F key for longer than 1 second and then pressing the MR key

will cause the Memory channel to skip during

Memory channel scan mode. If you hold and press this key while you turn on the

POWER switch you will clear all the microprocessor’s operator programmed memory section.

(DMHz/LOCK key

This key is used to tell the microprocessor that you

wish to increase or decrease the operating frequency in 1 MFIz increments.

Pressing this key within 10 seconds of pressing the F

key will cause the key lock function to activate, protecting the currently displayed data from accidental erasure.

Pressing the F key for longer than 1 second and then pressing MHz/LOCK key while the F indicator is flashing will turn the AUTOMATIC POWER OFF function on or off.(See page 48)

frequency a beep will sound from the speaker.

Pressing the same key sequence again will cancel

the function.

Pressing the F key for longer than 1 second and then pressing the SHIFT/AL key will store the currently displayed data as the upper limit for the program mable VFO tuning limit function.

Press this key to activate the call channel function.

Press the F key momentarily and then press the CALL key to store the currently displayed data into the CALL channel. The radio will allow you up to 10 seconds to press the CALL key after pressing the F

key.

Pressing the F key for longer than 1 second and then pressing the CALL key will store the currently displayed data as the lower limit for the programmable VFO tuning limit function. To operate the transceiver with the RC-10 press and hold the CALL key on the transceiver and then turn on the POWER switch.

(DSHIFT/AL key

SHIFT function

Pressing this key alone to select the desired transmitter offset direction. Pressing the key will cause the radio to shift from one offset direction to the next, i.e. “+” to " to simplex where no

indicator shows, (“—’’to“— —’’ for European

versions)

AL function

Pressing the F key momentarily and then pressing

the SHIFT/AL key will cause the radio to activate the

Priority Alert function. When this function is active

the radio will scan memory channel 1 at approxi

mately a 5 second interval. If there is activity on the

(DTONE/T.ALT key

TONE function

Pressing this key by itself causes the radio to select the desired tone signaling mode. When the “T’’ indicator is illuminated in the display the transceiver will transmit the selected subaudible tone. When the “CTCSS’’ indicator is illuminated the transceiver will both transmit the subaudible tone and will also

remain squelched until the proper subaudible tone

is received.

TONE frequency selection

Pressing the F key for longer than 1 second and then

pressing the TONE/T.ALT key will allow you to select the desired tone frequency. To change to a

different tone frequency rotate the tuning control

or press the UP/DWN switches on the microphone

until the desired tone frequency appears in the

display. To return to the normal frequency display

you can press any front panel key except the power

switch.

TONE ALERT function

If you press the F key momentarily and then press the TONE / T.ALT key, T.ALT function will be activated. This function will cause the radio to emit a series of beeps when an incoming signal is received. (See page 47)

'I88.8.8.B.8.S ififi

fJ« WP.

tc© °© ©°0

CTcsa ^

5-1-2 LCD Display Panel

(i)--(-A.LOCK

^-----

0—-DTSSir«-.

B8.8.8.8.8.sm8

(Z)REV/STEP key

This key is used to reverse the transmit / receive frequencies during repeater operation. If you have selected simplex this key will not function! Pressing the F key momentarily and then the REV/STEP key will allow you to select the desired VFO tuning step and Scan step size. Use the tuning control to select the desired tuning step and then press any front panel key except the POWER switch to return to the normal frequency display. Pressing the F key for longer than 1 second and then pressing the REV / STEP key will turn the BEEP function Off or ON.

(D DR/DT/ALT key(ALT: TM-541A/541E only)

DR/DT function

Pressing this key alone to select the DTSS(Dual Tone Squelch System) function or DRS (Digital Recording System) function.

ALT function

Pressing the F key momentarily and then the

DR/DT/ALT key will cause the ALT(Automatic Lock Tuning) function of the TM-541A/541E to activate.

Pressing the F key for longer than 1 second and then

pressing the DT/DR/ALT key will turn the DRS function ON or OFF.

(D LOCK

A.LOCK

DTSS DRS

APO

BUSY

® »afjifjilMfJii!

LOW MID

ON AIR

On when the Lock function has been activated. On when the All Lock function has been activated. On when the Automatic Lock Tun ing function is active. When the ALT system is operating the direction in dicator will turn on if the system shifts the receiver frequency. On when the DTSS function has been activated. On when the Digital Recording Sys tem is active. On when the Automatic Power Off function has been activated. On when the squelch opens. This level meter indicates the rela tive receiver signal strength or the

relative transmitter power output. Indicates the relative output power

setting for transmit. No indicator for high power. On when the Time Out Timer func

tion has been activated.

On during transmit.

® ★ ¿/¿/ Indicates the active memory channel

number. ★ indicates that the chan nel is locked out. C is displayed during call channel. Either PO, PI, P2, P3, or PA is displayed during paging.

® F I On whenever the F key has been de

pressed. Also shows the last memory channel number that had been se lected. On when the Tone Alert function is active. The indicator flashes when signal has been received.

@ CTCSS

____

REV

@ — + Display the selected transmitter off

On when the Tone Decode and En code function has been activated.

— On when the Tone Encode function

has been activated. On when the Priority Alert function

has been activated.

On when the Reverse function has

been activated. set direction.

Both — and + light at the same time during split channel operation.

@ :388.888s Displays the operating frequency to

the nearest kHz digit; or the tone frequency etc.

— The indicator flashes when scan

ning.

5-1-3 Rear Panel

©ANTENNA connector

Attach an antenna with a low SWR and an

impedance of 50 ohms.

Connect the supplied DC power cable to this

connector.

Pay close attention to the polarity. Red is positive and black is negative.

d)Fuse holder

Contains a requaired fuse. TM-241A: 15A, TM-441A: lOA, TM-541A: 8A Do not use a larger fuse as damage might result to the transceiver.

0 External speaker jack

This jack is used to connect an external speaker. The speaker should have an impedance of 8 ohms.

5-1-4 Microphone

(D ®

@ ®

@ p@ 0® 00

European version version

U.S.A.

dXDUP/DOWN switches

These switches can be used to increase or decrease the VFO frequency, the Memory channel number, and the Tone frequency, etc..

(D PTT (Push to Talk) switch

The transceiver will transmit whenever this switch is depressed. Scan operations may be canceled by press ing this switch without transmitting.

@CALL key (except European version)

This key functions just like the CALL key on the front

of the radio. 1750 key (European version) The transceiver will transmit with 1750 Hz repeater access tone whenever this switch is depressed.

(DVFO key

This key functions just like the VFO key on the front of the radio.

(D MR key

This key functions just like the MR key on the front of the radio.

(Z) PF (Programmable Function) key

This key can be programmed to perform any of the following functions: MHz key (Initial setting from the factory); or SHIFT-

key; or TONE key; or REV key;or DR/DT key ; or LOW key.

To program the key use the following procedure:

1. Turn the POWER switch on the transceiver OFF.

2. Press and hold the key on the front panel of the set that corresponds with the function you wish to program the microphone key to perform.

3. Turn on the POWER switch while the key on the front panel is held in.

4. Release the front panel key.

One additional function can be programmed that is

not included on the front panel of the transceiver.

This is known as the MONITOR function. This will al

low you to open squelch to check the band for a clear frequency. This will function even if you are operat ing in the CTCSS decode mode or DTSS mode or PAG

ING mode.

MONITOR programming

Press and hold the F key on the front panel as you turn on the POWER switch of the transceiver and then release the F key.

(D 16-Tone DTMF keypad (U.S.A. and CANADA version

only) These buttons are used to activate the DTMF encod er.

(D LOCK key

This key will deactivate all functions of the micro

phone except the PTT function and DTMF key pad.

5-2 RECEIVER OPERATIONS

Audio confirmation is provided whenever a front panel

key is depressed. You can disable this function by pressing the F key for longer than 1 second and then pressing the REV/STEP key.

5-2-1 Receptoin

1. Connect the power supply, antenna, and microphone and then adjust the controls as follows:

Power Switch

Vol Control ................... Full Counterclockwise

Power switch of power supply (Fixed station) SQL Control

2. Turn on the Power Supply and then turn on the transceivers POWER switch. The display should indicate a frequency. Fig.l shows examples of frequencies that will appear on the various models. In addition to the frequency you may see one or more control indicators illuminats on the display.

TM-241A/241E

ihHDDO

............

.................

TM-441A

(U.S.A. version)

TM441A/TM-441E

OFF

Full Counterclockwise

,,,, o o o n

HHu.u u u

^^nnnn

'^3u.u u u

TM-541A/541E

,,.,nnnn

id'iu.u u u

Note The frequencies shown above are the default frequencies after a microprocessor reset. If the display shows incomplete data or you think the displayed frequency is in error you should reset the Microprocessor. Memory Initialization on page 21.

3. Rotate the VOL control clockwise until a signal or noise is heard coming from the speaker.

4. Rotate the tuning control or press the microphone UP/DWN switches to select an open channel. Then rotate the SQL control clockwise until the noise just disappears and the BUSY indicator turns off. This point is known as the Squelch Threshold point. The squelch control must be adjusted to this setting for the Scan functions to operate properly.

5. Select the desired operating frequency using the microphone or tuning control. When a signal is received the S-meter will deflect and the BUSY indicator will turn ON.

Caution Turn off the transceivers POWER switch before you start or stop your vehicles engine, or your home power supply.

Fig. 1

5-2-2 Frequency Selection

5-2-3 Frequency Step Selection

You can change the dial frequency while in the VFO mode. The frequency can then also be stored in memory, or in the call channel using the techniques that will be described in this manual.

MR key

# VFO Mode Operation Frequency Selection

1. Press the VFO/M^V key to select the VFO mode.

2. Rotate the tuning control or press the microphone UP/DWN switches to select the desired frequency.

# Memory Channel Selection

1. Press the MR/M key.

2. Rotate the tuning control or press the microphone UP/DWN switches to select the desired memory

channel.

# CALL Channel Selection

Press the CALL key to select the Call channel.

The frequency step is indicated in the chart below. STFP

5i =^15^

TM-241A/E TM-441A/E TM-541A/E

To select the desired tuning or scan step size use the following procedure:

1. Press the VFO/M^V key to select the VFO mode.

2. Press the F key momentarily. The F indicator should light in the display.

3. Press the REV/STEP key within 10 seconds of pressing the F key. The current frequency step size will be displayed.

o o o o o o

o o o

±20t

o o o

n2.5?

o o

:^25

4. Rotate the tuning control or press the UP/DWN switches on the microphone until the desired tuning step size appears in the display.

5. To complete the programming of the step size you can press any key on the front panel except the

POWER key, or simply wait 10 seconds and the microprocessor will automatically return to the normal frequency display.

The chart below shows how the microprocessor will correct a new step size.

5,10,15,20 to 12.5,25

0,5,10,15 0 20,25,30,35 25 40,45,50,55 50

60,65,70,75,

80,85,90,95

12.5,25 to 5,10,15,20 0

12.5 25

37.5 30 50

62.5 75 70

87.5 80

0 10 20

50 60

5-2-4 Programmable VFO Tuning Limits

The TM-241/441/541 series radios provide the capabil ity of programming the VFO tuning range, in 1 MHz band segments, as well a providing a separate program mable band scan function(See page 26). For example you could tell the transceiver that you only wish to tune the 144 MHz and 145 MHz band segments. The tuning controls and microphone UP/DWN switches would then only tune within these specific frequency limits. The procedure for specifying these limits is described below.

1. Press the VFO/M^V key to select the VFO mode.

2. Rotate the tuning control or press the microphone UP / DWN switches until the desired lower tuning range appears in the frequency display. For example with the TM-241 you might want to select the 144 MHz band, and dial up 144.100 MHz.

3. Press the F key for longer than 1 second. The F indicator should begin flashing.

4. Press the CALL key within 10 seconds. A long beep will sound and the F indicator will turn off in the display. This indicates that the lower limit has been successfully stored in memory.

Now select the desired upper tuning limit using the MHz key and tuning control, or microphone UP/DWN switches. With our example TM-241 we want the upper band limit to be in the 145 MHz band, and therefore dial up 145.100 MHz. Press the F key for longer than 1 second. The F indicator will again begin flashing. Press the SHIFT/AL key within 10 seconds. A long beep will sound and the F indicator will turn off in the display. This indicates that the upper limit has been stored in memory.

8. To confirm that the programming was properly performed rotate the tuning control or press the UP/DWN switches. The transceiver should not go above or below the programmed band limits.

9. To clear both programmed limits simultaneously you should initialize the VFO memory using the procedures discussed on page 21. You can reprogram either limit independently by following the appropriate instructions above.

5-2-5 ALT (TM-541A/541E only)

The ALT system operates similar to an AFC (Automatic

Frequency Control) system. This system is useful when the frequency of either station starts to drift. When this occurs distortion of the signal is the usual result. The ALT system will detect the drift and shift the frequency to compensate. To activate the ALT function

1. Press the F key momentarily. The F indicator will turn on in the display.

2. While the F indicator is on press the DR/DT/ALT key. The ALT indicator will turn on and the receiver will automatically center itself on the incoming signal.

3. To release the ALT function press the F key momentarily and then the DR/DT/ALT key.

5-3 TRANSMITTER OPERATION

Caution

1. Ensure that an antenna with a low standing wave ratio (SWR) is attached to the antenna connector before attempting to transmit. Failure to provide proper termination may result in damage to the final amplifier section.

2. Always check to ensure the frequency is clear before transmitting.

3. Check the frequency to see if it is occupied before you transmit.

4. Press the PTT switch. The ON AIR indicator will light, and the RF meter will deflect to the right.

If you have selected the LOW power position, the low indicator will appear in the display and the RF meter will only deflect slightly. When HI power has been selected the RF meter will deflect full scale.

5. Speak into the microphone. The recommended distance to the microphone is 5 cm (2 inches).

Note The use of LOW power is recommended whenever possible, to avoid interfering with other stations.

5-3-1 Transmit Basics

1. Select the desired operating frequency using any of the methods previously discussed.

2. Press the LOW/DIM key to select the desired transmit output.

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5-3-2 Time-out Timer (TOT)

The TOT can limit the continuous transmission time to

30 minutes.

1. Press the F key for longer than 1 second, then press the LOW/DIM key. The T indicator will light. To cancel the setting, repeat the operation.

Press the key for longer than

1 second.

2. When the time-out timer reaches the transmission time limit, a beep will sound and the transceiver will return to the receive mode. To transmit again, release the PTT switch and press it again.

5-4 MEMORY

5-4-1 Microprocessor Memory Back-up

This transceiver contains a lithium battery to retain memory. Turning off the POWER switch, disconnecting the power cable, or a power failure will not erase the

memory.The battery should last for approximately five years. When the battery discharges, an erroneous display may appear in the display.

Lithium battery replacement should be performed by an authorized KENWOOD service facility; either your authorized KENWOOD dealer or authorized service cen ter.

5-4-2 Initial State

Initial state of the microprocessor from the factory is shown in the chart below.

TM-241A/E

VFO^ Memory channel U CALL channel frequency

VFO step Memory channel Tone frequency

144.000 MHz

5/12.5kHz

ICH

88.5Hz

5-4-3 Microprocessor Initialization

• Memory channel Initialization When you want to erase all programed data, or if the

display shows erroneous information, you should initialize (reset) the microprocessor using the following procedure.

1. Turn the POWER switch off.

TM-441A/E

440.000/

430.000 MHz

25kHz

ICH

88.5Hz

TM-541A/E

1240.000 MHz

25kHz

ICH

88.5Hz

2. Press and hold the MR/M key and turn on the POWER switch.

3. Release the MR/M key .

#VFO Initialization

All the settings, except the contents of the memory

and call channels, are initialized.

1. Turn the power switch off.

2. Press and Hold the VFO/M^V key then turn

the power switch on. No transmit/receive op eration occurs when this

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3. Press the VFO/M^ V key again.

5-4-4 Memory Channel

This transceiver provides 20 Memory Channels.

(18 Memory Channels when DRU-1 installed)

In addition to serving as a normal Memory Channel some of the Memory Channels serve a dual purpose to specify other parameters. The functions of those

Memory Channels are described below. O Memory Channel 1 is used to store the frequency for

the Priority Alert function.

O Memory Channel 7 ~10 are used to store odd split

repeater data.

O Memory Channel 11 is used to store the lower limit

for the Programmable Band Scan function.

O Memory Channel 12 is used to store the upper limit

for the Programmable Band Scan function

5-4-5 Memory Contents

5-4-6 Memory Entry

Each Memory channel is capable of storing the

following information. (YES Can be stored in memory.

NO : Cannot be stored in memory)

When the DRS unit is not installed and the DIME unit is installed.

CH1~3 CH4~6 CH7~10 Freq.(SIMPLEX) freq.(odd split) Tone freq.

Tone/CTCSS ON/OFF VFO freq. step YES YES YES Shift. REV ON/OFF

DTSScord. DTSS ON/OFF

YES YES YES YES

NC NC YES NC

YES YES YES YES

YES YES NC YES YES

NC NC NC

CH 11-20

YES

When the DRS unit is installed and the DTMF unit is not installed.

CHl-3 Freq.(SIMPLEX) freq.(odd split) Tone freq.

Tone/CTCSS ON/OFF VFO freq. step YES YES YES YES Shift. REV ON/OFF

DTSScord. DTSS

ON/OFF

YES YES YES

NC NC

YES YES YES

YES YES NC

CH4~6 CH7~10

YES NC

YES

NC NC

CHll-18

YES

•Simplex/Normal shift

1. Press the VFO/M^V key to select the VFO mode.

2. Select the desired operat ing frequency .offset,tone frequency,etc.( For exam ple 145.500MHz)

3. Press the F key. The F indicator and a memory

channel indicator will

light.( For example CH 8)

4. Select the desired Memory Channel using the Tuning control or microphone UP/DWN switches. (For example CH 5 )

5. Press the MR/M key within

10 seconds of selecting the Memory Channel. A long beep will sound and the F indicator and the Memory Channel number will turn CFF, and the transceiver will return to the VFC mode.

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Press the VFO/M^V key to select the VFO mode. Select the desired receiv

ing frequency ,tone fre

quency,etc. (For example

145.600MHz)

3. Press the F key.The F indi cator and a memory chan

nel indicator will light.( For

example CH 5)

4. Select any Memory Chan

nel from 7 thru 10 using the Tuning control or the microphone UP / DWN switches. (For example CH 10 )

5. Press the MR/M key within 10 seconds of selecting the

Memory Channel. A long beep will sound and the F indicator and the Memory Channel number will turn CFF.

6. Within 10 seconds of press

ing the MR / M key, you should select the desired

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145.700MHz)

7. Press the MR/M key within 10 seconds of selecting the

transmit frequency. A long

beep will sound to signal the data has been success fully stored.

8. To confirm the contents of the Split Memory Channel

press the MR/M key and re

call the channel. The re

ceiving frequency and

—F indicator will appear

in the display.

To check the transmit fre quency press the REV/STEP key or Microphone PTT switch. The transmitting frequency will appear in the display.

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1. Press the VFO/M^V key to select the VFO mode.

2. Select the desired operat ing frequency .offset,tone frequency,etc.( For exam ple 145.500MHz).

3. Press the F key. The F indi cator and the memory channel indicator will light.( For example CH 8)

4. Press the CALL key within

10 seconds of pressing the F key. The F indicator and the Memory Channel num ber will turn OFF,to con firm data entry.

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5-4-7 Memory Channel Recall

1. Press the MR/M key.

2. Rotate the tuning control or press the microphone UP/OWN switches to select the desired memory

channel.

5-4-8 Memory Shift

This feature copies Memory Channel or Call channel data to the VFO.

This will allow you to recall and alter these frequencies

without changing the actual contents of the memory or CALL channel.

1. Press the MR/M key or CALL key to select the MR mode or CALL channel mode.

2. Press the F key. The F indicator will light.

3. Press the VFO/M^V key within 10 seconds of pressing

the F key. The F indicator and the Memory or CALL Channel indicator will turn OFF to signal the data has been successfully transferred to the VFO.

NOTE If an Odd Split Memory channel is selected, only the receive data will be copied.

5-5 SCAN

When the scan function is turned on, turn the tone alert function off. If the tone alert function is on, scan will not activate.

5-5-2 Hold/Resume Programming

The transceiver will stop on a busy channel. Two type of scan hold / resume have been provided in this transceiver.

•Time operated scan

Scan will resume approximately 5 seconds after stop even if the station is still present.

5-5-1 Scan Operation

The following scan options are available:

1. Band scan

Scan proceeds over the entire band( This function op erates in the VFO mode only.).

2. Programmable band scan

The scan frequency range is determined by the fre quencies stored in Memory Channels 11 and 12 ( This function operates in the VFO mode only.).

3. Memory channel scan

Scan proceeds thru those memory channels that

actually have data entered and have not been locked

out (This function operates in the Memory Channel

mode only.).

•Carrier operated scan

Scan will hold as long as the signal is present, and will resume scan 2 seconds after the signal drop out.

Note When CTCSS is on, scanning stops only at the stations for which the CTCSS signal matches. When DTSS is on, the scanning stops and audio signals are received only when the DTSS code matches.

his transceiver is delivered from the factory in the Time operated scan mode. To switch between the two modes use the following procedure.

1. Press the F key for longer than 1 second. The F indicator will flash.

2. Within 10 seconds of pressing the F key press the VFO/M^V key. This will toggle the Scan / Resume

mode to Carrier operated mode.

3. To return to Time operated mode repeat steps 1 and

5-5-3 Band Scan

1. Press the VFO/M^V key to select the VFO mode.

2. Adjust the SQL control to the threshold point.

3. Press and hold the VFO / M^V key for longer than 1 second. The MHz indicator will flash as a visual reminder the transceiver is scanning.

-Press and hold the VFO / M^V key for longer than 1 second.

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4. Scan will begin in an upward direction.You can reverse the direction by rotating the Tuning control counterclockwise, or by pressing the microphone OWN switch. The scan step size depends upon the current step programming.

5. Scan will stop whenever a signal is received (that activates the BUSY indicator) for a limited time.

6. Press the PTT switch or any front panel key to stop scan.

5-5-4 Programmable Band Scan

1. The lower scan limit must be stored in memory chan nel 11 . The higher scan limit must be stored in memory channel 12.________________________________

Notes If the frequency in Memory Channel 11 is equal to or greater than the frequency stored in Memory channel

12 scan will proceed over the entire band”Band

Scan”.

2. Adjust the SQL control to the threshold point.

3. Press the VFO/ M^V key to select the VFO mode.

4. Select a VFO frequency between the two

programmed scan limits.

5. Press and hold the VFO/ M^V key for longer than 1

second. The MHz indicator will flash as a visual reminder the transceiver is scanning.

6. Scan will begin in an upward direction.You can reverse the direction by rotating the Tuning control counterclockwise, or by pressing the microphone

OWN switch.

7. Scan will stop whenever a signal is received (that

activates the BUSY indicator) for a limited time.

8. Press the PTT switch or any front panel key to stop

scanning.

5-5-5 Memory Channel Scan

1. Adjust the SQL control to the threshold point.

2. Press and hold the MR/M key for longer than 1 sec ond. The MHz indicator will flash as a visual reminder the transceiver is scanning.

5-5-6 Memory Channel Lockout

The Memory Channel Lockout function allows you to temporarily skip unwanted Memory Channels during

Memory Channel scan.

1. Press the MR/M key to select the Memory Channel mode.

2. Select the Memory Channel that you wish to skip by using the Tuning control or the microphone UP/DWN switches.

3. Press the F key for longer than 1 second. The F indica tor will flash. Within 10 seconds of pressing the F key press the MR/M key. A star (★) will appear to the left of the Memory Channel number . This indicates the

Memory Channel will be skipped during the Memory

Channel scan operation.,

3. Scan will begin at the current memory channel and proceed sequentially .i.e.Ml ^ M2 -> M3 etc. Only those memory channels with data entered are scanned.

4. Scan will stop whenever a signal is received (that ac tivates the BUSY indicator) for a limited time.

5. Press the PTT switch or any front panel key to stop scanning.

1 second.

4. Repeat steps 2 and 3 to lock out any other Memory Channel that you want to skip

5. To cancel the lockout , select the desired Memory Channels as described in step 1,2,and 3 above. The star (★) will go out. The Memory Channel will

now be scanned normally.

5-5-7 Priority Alert Function

The priority alert function allows you to monitor mem ory channel 1 for activity even when you are tuned to a different channel number. When the Priority Alert function has been activated the microprocessor will

switch the transceiver to the frequency stored in mem ory channel 1 once every 5 seconds. The transceiver will determine if a signal is present. If no signal is present

the transceiver will return to the original frequency. If a

signal is present, a beep will sound from the speaker to signal the channel is busy. This whole process takes just a fraction of a second, so you will not see the display

frequency change. The only thing you will notice is a

momentary pause in the signal on the currently dis played frequency. To activate the priority alert func tion:

1. Ensure the frequency you wish to monitor has been entered into memory channel 1.

2. Adjust the SQL control to the threshold point.

3. Press the F key momen- _ tarily, and then the SHIFT/AL key. The AL indicator will turn on in the display to remind

you that this function has been activated.

4. If a signal is present a beep will be heard from the

speaker.

5. To turn this function off repeat step 3. The AL indi cator will turn off.

Note: During the period memory channel 1 is being scanned you will not hear voice communications, only the beep will be heard if a signal is present.

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5-6 REPEATER OPERATIONS 5-6-1 Transmitter Offsets

All radio repeaters utilize a separate receive and trans mit frequency. The receiver frequency may be either above or below that of the transmit frequency. The configuration of most repeaters will fall into one of the categories listed below:

TM-241A/

241E

+ + 600 kHz

-600 kHz -5 MHz

—

TM-441A

+ 5 MHz

TM-441E European

version

+ 1.6 MHz + 12 MHz

-1.6 MHz -12 MHz

-7.6 MHz -20MHz

Offset Direction To select the desired transmitter offset direction press

the SHIFT/AL key. Each time you press the key the transceiver will advance from one direction to the next, i.e. “+” to to ”

-------

541A) to no offset (simplex). Automatic Offset Selection (TM-241A U.S.A. version)

The TM-241A has been programmed according to the standard ARRL (Amateur Radio Relay League) Band

Plan with regard to transmitter offset direction. Please see the accompanying chart for addition information on this programming. You can, of course, override this by using the SHIFT/AL key if desired.

145.1 145.5 146.0 146.4 146.6 147.0 147.4 147.6 148.0

—

TM-541A TM-541E

+ 35 MHz

-6 MHz

“ with TM-441Eand TM-

—

S: simplex

5-6-2 Reverse Function

Some repeaters utilize a “Reverse Pair”, i.e. the transmit / receive frequencies are exactly the reverse of another repeater. For example repeater A uses 146.000 for a transmit frequency (INPUT) and 146.600 for a receiver frequency (OUTPUT). Repeater В might use 146.600 for a transmit frequency and 146.000 for a receiver fre quency. It would be inconvenient to have to reprogram the transceiver each time you wanted to use these re peaters. The REV/STEP key allows you to easily reverse the trans

mit and receive frequencies. To use the REV function press the REV/STEP key. The REV indicator will turn on in the display to remind you that you are working a re verse pair. To return to normal press the REV/STEP key again. The

REV indicator will turn off. This function is also useful to check the input frequency

of the repeater so that you can determine if you are

within range for simplex communications.

5-6-3 Tone Operation

Some repeaters require the use of a control signal to ac tivate the repeater. Several different methods are cur

rently in use.

In the United States sub-audible tones are sometimes

used. 38 different Sub-audible frequencies are possible.

In Europe a 1750 Hz tone is used in transmit. Press and

hold the Microphone 1750 key to transmit with the ac cess tone; you need not press the PTT key.

Since this tone is required in Europe and the United

Kingdom a 1750 Hz tone encoder is included with

models delivered to these countries.

5-6-4 Tone Frequency Selection

1. Press the F key for longer than 1 second. The F indi cator will begin to flash. Press the TONE/T.ALT key

within 10 seconds of pressing the F key. The current

tone frequency will show in the display.

Press the key for longer than

1 second.

2. Rotate the tuning control or press the microphone UP/OWN switches to select the desired tone frequency.

3. Press any front panel

key to return to the normal frequency display.

Tone FrequencvC Hz)

67.0 107.2

71.9

74.4

77.0

79.7

82.5

85.4

88.5 136.5

91.5 141.3 225.7

94.8 146.2

(97.4)

100.0

103.5 162.2

Note: 97.4 Hz is available only for encode.

110.9 173.8

114.8

118.8

123.0

127.3 203.5

131.8 210.7

151.4

156.7

167.9

179.9

186.2

192.8

218.1

233.6

241.8

250.3

5-6-5 Autopatch Operations (U.S.A. versions

only)

Some repeaters offer a service known as autopatch. This feature allows you to dial a telephone number from your transceiver and carry out a telephone conversion, much like a car telephone, or cellular telephone. This function requires the use of a DTMF (Dual Tone Multi Frequency) pad. The MC-44DM microphone provides the normal keys you would have on your telephone at home, as well as 4 additional keys, the A,B,C, and D keys. These keys are used for control operator of the re peater to see if they offer autopatch services.

To activate the keypad:

1. Press and hold the PTT key.

2. Press the keys just like you would dial your telephone at home.

3. The transceiver will remain keyed for approximately

2 seconds after you press each number, so you can re lease the PTT switch without unkeying the transceiv

er.

Note; Some repeaters will require the use of a special key sequence to activate the Autopatch function. You should check with your control operator for this

sequence.

5-7 TONE/CTCSS OPERATION

With the use of the optional Sub-Audible tone decoder

unit (TSU-6) you will be able to operate in a Tone Oper ated Squelch Mode. When this option is installed and the CTCSS function has been activated the radio will not open squelch until the proper PL tone is received.

Press the TONE/T.ALT key and select the desired Tone mode. When the T indicator appears in the display the transmitter will transmit the desired tone. When the CTCSS indicator appears in the display the transceiver will transmit the desired tone and will also operate in the Tone Squelch mode. i.e. squelch will not open until the same tone is received as a portion of the incoming

receive signal. When no indicator is on the radio will not make use of either tone feature.

No indicator

Note: Even if the TSU-6 is not installed, tone signals can be transmitted, so the tone squelch of the other trans ceiver can be opened.

CTCSS

5-8 DTSS (Dual Tone Squelch System)

OPERATION [Requires optional DTU-2]

This function allows squelch to be turned on in the receive mode on reception of a three-digit code matching the DTSS code selected in your radio. Once squelch is turned on by reception of a matching code, it operates normally from then on. If no signal is received for longer than 2 seconds, squelch is turned off

until a matching code is again received.

CTCSS signal cannot pass through the repeater, but

DTSS signal can pass through the repeater.

NOTE This function is not available in some areas. The DTSS (or PAGIMG) cord may not be accepted if the

repeater is “identifying”. If this should occur you should press the PTT switch again, and retransmit the DTSS (or PAGING)

cord.

There are two recommended methords of compensating for

this situation.

1. Press the PTT switch for a few seconds, send the DTSS (or PAGNG) cord, release the PTT switch, then press the PTT

switch again and resend the appropriate cord.

2. Proper DTSS (or PAGING) operation will occur if you ensure

the battery saver circuit is disabled whenever you intend to operate using eithr the DTSS or PAGING modes.

Memory channels 4 to 20 and the call channel cannot store DTSS codes, but a DTSS code can be set each mode.

5-8-2 DTSS Code Selection

When DTMF unit DTU-2 [option] is installed, the initial setting is 000.

DTSS

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• Selecting and Storing the DTSS code with the VFO

1. Press the DR/DT key to light the DTSS indicator.

2. Press the F key, then press the DR/DT key while the F indicator is on (10 seconds). The first digit of the DTSS code will flash.

5-8-1 Selecting and Storing the DTSS code

DTSS codes from 000 through 999 can be selected from the VFO mode and stored in memory channels Memory channels 1 through 3 can each store a separate DTSS code.

3. Select the first digit by rotating the Tuning control.

4. Press the DR/DT key. The first digit is registered and the second digit begins to flash.

5. Select the second digit by rotating the Tuning control.

6. Press the DR/DT key. The second digit is registered

and the third digit begins to flash.

7. Select the third digit by rotating the Tuning control.

8. Press the DR/DT key and the complete DTSS code is registered. The mode returns to the previous one.

• Selecting and storing a code with the DTMF KEY PAD (MC-44DM)

1. Press the DR/DT key to light the DTSS indicator.

2. Press the F key, then press the DR/DT key while the F indicator is on (10 seconds). The DTSS code setting mode will be entered and the first digit of the code will flash.

3. Then enter a three-digit number on the key pad.

Notes

1. If a key other than the DR/DT key on the front pannel is pressed during operation, code selection mode is canceled.

2. If no action is taken for longer than 10 seconds, code selection mode is automatically canceled.

5-8-3 Selection using memory channels 1

through 3

• Storing VFO frequencies and DTSS codes at the same time

1. Select the desired frequency to be stored in memory in the VFO mode.

2. Follow steps 1 through 8 above in the VFO mode.

3. Press the F key

4. Select the desired memory channel (1, 2, or 3) with the tuning control or the UP/DWN key on the micro phone.

-----------

5. Press the MR/M key

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• Rewriting DTSS codes in memory channels (Ito 3)

1. Press the F key while the memory channel is operat- | ing, then press the DR/DT key while the F indicator is i on. The DTSS code setting mode will be entered and | the first digit of the code will flash. i

2. Store the selected code in memory. Follow steps 1 through 8 in VFO mode to edit a stored code.

5-8-4 Using the DTSS function

5-8-5 Using DTSS with a repeater

1. Adjust the SQL control to the threshold point. 2, Press the DR/DT key. The DTSS indicator will light.

Each time the DR/DT key is pressed, the DTSS and

paging functions will be selected:

• RECEPTION

3. Squelch will open when the proper code is received.

• TRANSMISSION

4. When the PTT switch is pressed, the code shown in the figure is sent out for about 0.5 second.

PTT ON

Note

Voice output is muted during code output.

5. To cancel the DTSS function press the DR/DT key

twice time.

PTT OFF

Code (Approx.

0.5 seconds)

The DTSS signal is transmitted after a short delay if the

PTT switch is pressed while the — or -f indicator is lit. This is to avoid any malfunction due to the DTSS signal being interrupted by repeaters with long response times

• Delay during DTSS output

A delay is built in when the DTSS is sent out.

The delay time for normal transmission is 250 ms (not

modifable).

The initial setting for shift, split channel, and duplex

is 450 ms, and can be changed to 750, 850, or 1000 ms.

• Changing the delay time

1. Turn DTSS mode on.

2. To change delay time press the F key for longer than 1 second and press the CALL key while the F indicator is flashing.( within the 10 seconds.)

3. Display the desired delay time with the tuning control or the UP/DWN key on the microphone. The displayed delay time takes effect immediately. If any other key is pressed or if, after 10 seconds, no key has been pressed, the delay time setting mode is ter minated.

5-9 DRS (Digital Recording System)

OPERATION

The optional DRU-1 (Digital Recording Unit) permits you to manually or automatically record up to a maxi mum of 8 different voice messages for later playback. The automatic recording function works in conjunction with the T.ALT function. This function can be used with the DTSS or paging mode.

Press the F key for longer than 1 second, then press the DR/DT key while the F indicator is flashing. This opera-

DTMF control mode Automatic Recording The DRS indicator will flash. The DRS function can be remotely controlled by an external DTMF signal. The DRS indicator goes on continuously.

5-9-1 Before Recording

The recording conditions are preset at the factory for the following settings: Tone Quality Level 1 Maximum recording phrase 8

DRS indicator lights in the display

5-9-2 Tone Quality Level Selection

1. DRS indicator lights in the display.

2. Press the TONE/T.ALT key. Each time you press the TONE/T.ALT key the tone quality indicator will ad vance, i.e. from 1 to 2 to 3 and the back to 1, etc. Tone quality 1 will provide the best audio quality, but the shortest recording time. Tone quality set tings 2 and 3 provide longer recording times but with an associated decrease in tone quality.

Relationship between the maximum num ber of phrases, sound quality level, and re cording (playback) time

If the maximum number of phrases is set to 8 and the sound quality level is set to 1 (standard), the record ing time for one phrase will be 4 seconds. Since the phrase number goes from 1 to 8, eight different re cordings are possible. To increase the recording time, set the maximum number of phrases to 1 and the sound quality level to 3. The recording time will be come 96 seconds. In this case, only one phrase can be recorded, so the currently recorded phrase will be erased when a new one is recorded. Set the maxi mum number of phrases and the sound quality level as required. The recording (playback) time for each phrase cannot be set.

5-9-3 Selecting the maximum number of

Phrases

1. Press the F key for longer than 1 second, then press the DR/DT key while the F indicator is flashing.

DRS indicator lights in the display

2. Press the SHIFT/AL key. Each time you press the key the maximum phrase indicator will step one position, i.e. from 8 to 4 to 2 to 1 and then back to 8.

Number of maximum phrase

Sound quality level

1 2

(second/phrase)

5-9-4 Recording

# Recording an incoming receive signal manually.

1. Select the desired operating frequency. Recordings can be made from the VFO mode, the Memory Mode or the Call Channel mode.

2. Press the F key for longer than a second, then press the DR/DT key while the F indicator is flashing to en ter the DRS setting mode. The DRS indicator should turn on in the display. Select the desired phrase number by rotating the tuning control.

3. Press the VFO/M^V key to begin recording. The recording time indicator will show the elapsed time of the recording.

----

Elapsed time

4. Recording will stop when the time indicator reaches “00”. To continue recording from the same frequency rotate the tuning control to the next phrase number and then press the VFO/M^V key again to begin recording. Recording will stop when any front panel key is pressed.

# Recording Signals from the Microphone

1. Press the F key for longer than 1 second, then press the DR/DT key while the F indicator is flashing to enter the DRS setting mode. The DRS indicator should turn on in the display. Select the desired

phrase number by rotating the tuning control.

2. Press the MR/M key to start recording from the

microphone. The recording time indicator will indicate the elapsed time of the recording. If you wish to transmit the same message while recording you should press the microphone PTT switch before you press the MR/M key.

/ U.S.A. \

\ version /

So66

3. The recording will stop when the elapsed time

indicator reaches “00”. If you wish to continue recording you will need to rotate the tuning control to the next phrase number and press the MR/M key again.

Recording will stop when any front panel key is

pressed.

5-9-5 Play Back

5-9-6 Automatic Recording

2. Press the CALL key to play back the message. If you wish transmit the message at the same time you should press the PTT key before pressing the CALL

key. The elapsed time indicator will begin counting

the elapsed time.

— Elapsed time

----

amm

o < 1

Ou a 1 1

— »4

3. Playback will stop when the time indicator displays

“00”. You can manually stop the play back by pressing any front panel key.

1. Select the desired operating frequency. Adjust the SQL control to the threshold point. Automatic recording is possible in the VFO mode, Memory Channel mode, or Call Channel mode.

2. Press the F key for longer than 1 second, then press the DR/DT key while the F indicator is flashing to enter the DRS setting mode. Select the desired tone quality, the number of

recording phrases, and the beginning phrase number.

3. Press the F key for longer than 1 second, then press

the DR/DT key while the F indicator is flashing to en ter the DTMF control mode. The DRS indicator will flash.

4. Press the TONE/T.ALT key. The T.ALT indicator will

light and the recording wait mode (automatic re cording mode) will be entered.

5. Only a signal with the proper CTCSS tone (if the TSU6 is installed ) will initiate recording. If no tone unit is installed the recording will start whenever squelch opens. (The alert function will not sound an alarm.) The CTCSS, DTSS (only reception is possible even if the DTMF unit is not installed), and paging functions are available.

6. If the squelch is closed during recording in the automatic recording mode, recording will finish at the current phrase, and the next phrase will be awaited even if there is recording time remaining. (Recording will not be possible if there is no empty phrase.

OLock canceling

5-9-7 External Control of the DRS Function

(DTMF control mode)

The DRS function can be remotely controlled by an

external DTMF signal.

5-9-8 ID Number Seting

Select a four-digit number from 0000 to 9999.

1. Press the F key for longer than 1 second, then press the DR/DT key while the F indicator is flashing. The

DRS setting mode will be entered and the DRS indicator will light.

If the third digit of the display is “1“, recording is locked, and a new signal cannot be recorded in the same phrase. If the third digit is “2“, recording and playback are locked, and a new signal cannot be recorded in the phrase and the phrase cannot be played back. To cancel the lock, press the REV/STEP key so that the third digit become zero(O).

2. Press the MHz / LOCK key. Four digits will be displayed, and the first digit will flash.

-----■ ---------------

(d v 9. i

. '.

^ 'n.nnn

»WOOD

n ..

3. Set the first digit with the tuning control, then press the MHz/LOCK key. The second digit will flash.

4. Set the second digit with the tuning control, then press the MHz/LOCK key. The third digit will flash.

5. Set the third and fourth digits. When the fourth digit has been set, the DRS setting mode will be automatically reentered.

OThe digits can be set with the MC-44DM (option).

Perform steps 1 and 2, and key in the number with

the numeric keys.

Each time a key is pressed, a digit is set. When all the

digits have been set, the frequency will be displayed

again.

4. Press the F key. The DRS indicator will stop flashing and stay on. The transceiver will be ready to be con trolled remotely.

The automatic recording mode will be ignored, as will the DTSS and paging modes.

5-9-10 External Control Method

For external control, recognition code # or ♦ will transmit a four-digit ID number and three-digit command code.

5-9-9 Setting the DTMF Control Mode

1. Select the receive frequency.

2. Enter the DRS setting mode, and specify the number of phrases, sound level, and ID number. (See Sections 5-9-1/2, 5-9-5, and 5-9-8.)

3. While in this state, press the F key for longer than 1 second, then press the DR/DT key while the F indica tor is flashing. The frequency will be displayed again and the DRS indicator will flash.

1 second.

# 1 2 3 4 * 0 1

Leading zeroes in the ID number can be omitted.

•List of DTMF commands

See next page

Note;

To transmit a DTMF signal, press a key within five

seconds of pressing the preceding key. If there is a time delay of longer than five seconds, the DTMF signals that have been transmitted will be cleared.

Reset command and

stop recording Record with the first

phrase Record with the

second phrase Record with the third

phrase Record with the 4th

phrase Record with the 5th

phrase

Record with the 6th

phrase Record with the 7th

phrase Record with the 8th

phrase Record with each

phrase for which re

cording is not locked

Reset command and stop recording

—

Unlock recording of

all phrases Unlock recording of

the first phrase

Unlock recording of

the second phrase

Unlock recording of

the third phrase Unlock recording of

the 4th phrase Unlock recording of

the 5th phrase Unlock recording of

the 6th phrase

Unlock recording of

the 7th phrase

Unlock recording of

the 8th phrase

Automatic recording

mode on

—

Set 1 for the tone

quality Set 2 for the tone

quality Set 3 for the tone

quality

—

Set 1 for the number of phrases

Set 2 for the number of phrases

Set 4 for the number

of phrases

Set 8 for the number of phrases

Automatic recording mode off

5-10 PAGING

The paging function is available when the optional

DTMF unit (DTU-2) is installed.

The paging function is useful to call all stasions a group,

a specific station, or wait for a call from another station

by using DTMF(Duai Tone Multi Frequency signaling.

Example: When station 2 is called

F : 145.660MHz Your code

145.660MHz

Your code

Paging operation procedure

Set your station code

Tune to frequency of the other station

Enter the paging mode

F : 145.660MHz

Individual code : 222

Station I

F : 145.660MHz

Individual code : 333

Station 2

F : 145.660MHz

Individual code : 444

Station 3

The common group code and individual codes should be determined in advance. These codes should be from 000 to 999 (3 digits). Unlike DTSS, the code of the calling station is displayed on the receiver, so the receiver can identify the calling station. When called by a local station, the individual code of the calling station is displayed. When called with a group code, that group code is displayed.

To call the

other

station

Set the code of station to be called

Transmit

Call

To stand by for a pager

Stand by

5-10-1 Paging Code Memories

There are five(5) paging code memories.

Use

4. Press the DR/DT key. The first digit will flash. (Not necessary this operation if you use DTMF microphone)

PA PO

P1-P3

Store your individual ID code in memory. Automatically stores the calling station’s

code during reception. Can temporarily set code for the station.

Stores group codes and local station codes in memory.

5-10-2 Setting the Paging Codes

1. Press the DR/DT key to enter the paging mode. The P indicator will light.

2. Press the F key, then press the DR/DT key while the F indicator is on. The code setting mode will be

entered and the memory channel indicator will flash.

3. Set the desired memory (0 to 3 or A) with the tuning control (or key 0 to 3 or A on the microphone [op tion] with DTMF).

5. Set the desired number with the tuning control and press the DR/DT key (or key 0 to 9 on the microphone with DTMF). The first digit will be set, and the second digit will flash.

6. Set the second and third digits with the tuning control, and press the DR/DT key.

7. If, after 10 seconds, no key has been pressed, or a key

other than DR/DT or MR/M is pressed, the code will be set.

For example, the following groups communicate with each other. Predetermined frequency 145.660MHz Your individual code 111 Station I’s individual code 222 Station 2’s individual code 333 Station 3’s individual code 444 Group code 789

Station 2 memory

333 PO P3 789

5-10-3 Paging Transmission(Calling)

Your individual ID code is preset in memory A. (Your individual ID code is always stored in memory A.)

1. Tune to the predetermined frequency.

2. Press the DR/DT key to light the P indicator.

-w5.fi fiu PR

C© °© 0°0 ©

3. Press the F key, then press the DR/DT key while the F indicator is flashing.

I ! I p}s^'-

c©-0 e°0

4. Select the memory number in which the local station code is stored using the tuning control.

Turn the paging function of the other transceiver on.

Calling all station in the group

Calling a specific stationiExample: Call station 3.)

1. To call all station in the group, select the memory number in which the group code is stored. In this example, the number is stored in number P3.

2. Press the PTT key once or press a key other than DR/DT or MR/M to display the frequency again.

3. Press the PTT switch.

Group code 789 and your station ID code 111 are transmitted. A DTMF tone sounds is heard during transmitting.

To call a specific station (for example, station 0. 3), use the following procedure:

1. Select the memory in which the local station code is stored (in this example, select memory P2.) or Enter the individual code of the local station in memory 0.

2. Press the PTT key once or press a key other than DR/DT or MR/M to display the frequency again.

3. Press the PTT switch.

145.660MHz

444*111

,wS.55u p?

iwriii

000 0O0 000^

Local station code 444 and your station ID code 111 are transmitted. A DTMF tone sounds is heard during transmitting.

5-10-4 Paging Reception (Stand by)

1. Tune to the predetermined frequency.

2. Press the DR/DT key to light the P indicator.

IhS.BBu PR

0O0 ©O0j

5. The individual code of the calling station is stored in memory 0.

Press the PTT switch to respond to the calling station.

stand by with individual code (Example: Stand by for

3. When called with your station ID code, the memory number automatically change to 0. The ID code of the member 3 is displayed.

4. The squelch is opened.

station 3.)

local station code

OuUU

• 111

-9

--------

OVfcF*

-----

Zero is displayed to indicate that your station is being called.

Flashing

V* i

When the transmission ends, the frequency will be dis played again. After the local station has been contacted, cancel paging mode. Communication can be performed more efficiently.

If the local station code can not be decorded, “Err“ appears on the display.

r r

I Li

stand by with group code

1. When a call is received with the group code, the squelches of all the members of the group are opened to enable reception.

When you are called with the group code, the common group code and its memory channel number are displayed. (Example: Group code 789 is stored in channel 3.)

Group code Flashing

5-10-5 Code Lockout

(A code is locked out only during reception with the paging function.)

If an individual code is stored in P1,P2 or P3, reception is enabled when the codes match, even if one local station communicates with another. To use memories

PI to P3 for transmission only, lock out the memories. When you are communicating with two or more groups having the same frequency, lock out the group code with which stand by is temporarily stopped.

P183 -P:3

-9

--------

OVER-

/ I \

3 is displayed to indicate that the station is being called.

2. When the PTT switch is pressed, group code 789 (as displayed) and your station ID code are transmitted. You can participate in the group-roundtable.

3. After the remote station has been called, cancel paging mode. Communication can be performed more efficiently.

• Paging memory lockout

1. Enter the code setting mode and display the number (except memory 0 and A) to be locked out using the tuning control.

2. Press the MR/M key. ★mark lights and the memory is locked out.

5-11 TONE ALERT SYSTEM

The Tone Alert function will provide an audible “Alarm” to signal when someone is transmitting on the frequency you are monitoring._______________________

Note

1. When using the CTCSS function the incoming sig nal must be present for approximately 2 seconds in order for the Tone Alert function properly.

2. When the DTSS function is on, the bell function works only when the DTSS code matches.

3. When the paging function is on, the bell function works only when the paging code matches.

1. Adjust the SQL control to the threshold point.

2. If you will be using the CTCSS function you should select the proper tone frequency and ensure the CTCSS indicator is on.

If you will be using the DTSS function you should select the proper DTSS codes and ensure the DTSS indicator is on.

If you will be using the PAGING function you should select the proper PAGING codes and ensure the P indicator is on.

3. Press the F key and then the TONE/T.ALT key. The T.ALT indicator will light.

4. When a signal is received and the squelch is open, an alarm sounds for about five seconds, the T.ALT indicator flashes, and the elapsed time count begins.

5. The elapsed time is displayed in minutes to up to 59 hours 59 minutes. If a new signal is received during counting, the elapsed time is cleared, and the elapsed time from the new signal being received is

-■9-i

S5.S5

6. If a key is pressed while the elapsed time is being displayed, the T.ALT function is released.

7. To release the T.ALT function when no signal is being received, press the TONE/T.ALT key again

Notes

1. When the PF key on the microphone is set as the monitor key, the voice can be monitored by press ing the PF key while the T.ALT function is working.

2. The T.ALT function may fail if the received signal is abandoned (audio low-frequency distortion, igni tion noise, etc.). In this case, the interference can be reduced by installing an optional TSU-6 and setting the CTCSS frequency to 141.3 Hz or lower. When a repeater is used, the CTCSS function is not available. It is recommended to use it with the DTSS function.

3. The tone Alert System can not be use in conjunction with Scan.

''i

________

5-12 APO (Automatic Power Off)

The automatic power-off function turns the power off automatically if you forget. It does not operate during scanning. The initial setting is OFF.

1. To turn the APO function off and on, press the F key for longer than 1 second, then press the MHz/LOCK

key within 10 seconds. The APO indicator lights.

2. If, after 2 hours 59 minutes in inactive receive mode, no key has been pressed, the APO indicator flashes and a beep sounds. If no key is pressed for 1 minute after that, the display indicates the following, all the functions are disabled, and the transceiver enters the automatic power-off state.

3. To leave the automatic power-off state, turn the power switch off and on again.

Notes

1. A small current flows during the automatic power off state. If the transceiver is not going to be used, be sure to switch the

power off.

2. If the APO function is turned on and then the bell function is turned on, the automatic power-off function does not work un til the bell function is turned off (though the indicator lights).

3. This function is not available when the remote controller is con nected.

5-13 DIM (DIMMER)

The intensity of dial illumination can be set to one of four levels.

1. Press the F key, then press the LOW/DIM key while the F indicator lights.

2. Select the desired value with the tuning control or the UP/DWN key on the microphone.

3. If, after 10 seconds, no key has been pressed, the dis

played level is set and the original frequency is redis played.

5-14 BEEP

The beep can be turned on and off. Press the F key for longer than 1 second, then press the

REV/STEP key while the F indicator is flashing.

Each time this is done, the beep is turned on or off.

LOCK

The panel keys (except F and MHz/LOCK key) and the tuning control are disabled. However, the

microphone function works. Press the F key, then press the MHz/LOCK key within

10 seconds. The LOCK indicator lights.

To release the lock, press the F key again, then press the MHz/LOCK key within 10 seconds.

There are three types of lock functions. (I) Microphone key lock

When the switch on the rear of the microphone is set to the LOCK position, all the microphone keys except the PTT key are disabled.

A.LOCK(ALL LOCK) All operations, except the power switch, volume, and squelch, are disabled.

Switch the power off while the LOCK indicator is on, hold down the MHz/LOCK key, and switch the power on again. The A.LOCK indicator lights.

To release A.LOCK, switch the power off while the A.LOCK indicator is on, hold down the MHz/LOCK key, then switch the power on again. The A.LOCK operation cannot be canceled by VFO or MR reset.

7 MAINTENANCE

7-1 GENERAL INFORMATION

Your transceiver has been factory aligned and tested to specification before shipment. Under normal circumstances the transceiver will operate in accordance with these operating instructions. All adjustable trimmers and coils in your transceiver have been adjusted at the factory and should only be readjusted by a qualified technician with proper test equipment. Attempting service or alignment without factory authorization can void the transceiver’s warranty. When operated properly, the transceiver will provide many years of service without requiring realignment. The in formation in this section gives some general service procedures which can be accomplished without sophisticated test equipment.

7-2 SERVICE

If it ever become necessary to return the equipment to your dealer or service center for repair, pack it in its original box and packing, and include a full description of the problems involved. Please include your daytime telephone number. You need not return accessory items unless directly related to the service problem. Service note;

Dear OM, if you desire to correspond on a technical or operational problem, please make your note short, complete,

and to the point, and PLEASE make it readable.

Please list: Model and serial number.

The problem you are having.

Please give sufficient detail for diagnosis. Provide information such as other equipment in the station, meter readings and anything else you feel might be useful in attempting diagnosis. Caution:

Do not pack the equipment in crushed newspapers for shipment. Extensive damage may result during shipment.

Notes;

1. Record the date of purchase, serial number and dealer from whom purchased.

2. For your own information, retain a written record of any maintenance performed on the unit.

3. When claiming warranty service, please include a photocopy of the bill of sale, or other proof of purchase showing the date of sale.

7-3 IN CASE OF DIFFICULTY

The problems described in this table are failures caused, in general, by improper operation or connection of the

transceiver, not by defective components. Check according to the following table.

Symptom

Indicators do not light and no receiver noise is

heard when the POWER switch is turned on.

No sound from the speaker. No signal can be

received.

No transmitter output.

Weak signal cannot be received. Poor antenna connection. Display is dark.

Memory cannot be backed up.

1. Bad power cable or connections.

2. Blown power supply fuse.

1. Squelch is closed.

2. With the TSU-6; CTCSS is operating.

1. Microphone is not plugged in.

2. Poor antenna connection.

1. Power voltage is low.

2. The DIM had been selected too dark.

Back up battery voltage is low.

Probable cause

Corrective action

1. Check cables and connections.

2. Check for the cause of the blown fuse and replace the fuse.

1. Turn the SQL control counterclockwise.

2. Press the TONE/T.ALT key to turn off the

cress

1. Plug jack in.

2. Connect antenna securely.

Connect antenna securely.

1. Check voltage for 13.8 VDC ± 15 %.

2. Press the F key and the LOW/DIM key.

See Microprocessor memory backup page 21.

See page 48

The display will not change when the tuning control is rotated or a key is pressed.

1. The lock is on.

2. A.LOCK is on.

1. Press the MHz/LOCK key within ten seconds of pressing the F key.

2. Hold down the MHz/LOCK key, switch the power on, then perform the opera tion in 1.

7-2. ACCESSORIES

MC-44/MC-44E (E: European Version) MULTI FUNCTION MICROPHONE

■ MC-60A MICROPHONE (8-pin)

The zinc die-cast base provides high stability. The

MC-60A is complete with PTT and LOCK switches, UP/DOWN switches, impedance selec tor switch and a built-in pre-amplifier.

SP-41 MOBILE SPEAKER

(4 ohms)

MC-44DM/MC-44DME

(E: European Version)

MULTI FUNCTION MICROPHONE

WITH AUTOPATCH

■ MC-80 MICROPHONE (8-pin)

The MC-80 is an omnidirectional electret con denser microphone that is provided with UP/DOWN switches, volume adjustment for out put level, PTT and LOCK switches, and a built-in pre-amplifier.

■ SP-50B MOBILE SPEAKER (8 ohms)

Compact and smart, high quality external speak er provides flexibility of installation for maximum convenience.

■ MC-55 MOBILE MICROPHONE (8-pin)

The MC-55 provides UP/DOWN switches, LED display for switching transmit or receive, ad justable microphone gain, automatic timeout cir cuit (approx. 5 minutes) and many other functions.

■ MC-85 MICROPHONE (8-pin)

The MC-85 is a unidirectional high-class electret

condenser microphone provided with an output selector switch, audio level compensation circuit, low cut filter, level meter, PTT and LOCK switches.

■ SP-430 EXTERNAL SPEAKER

The SP-430 is an attractive, compact external speaker. This low-distortion speaker provides clear reproduction of the high-quality audio obtained from the transceiver.

NOTE: 1750 Hz repeater access tone is only available from MC-44E or MC-44DME European version microphone.

CTCSS UNIT

TSU-6

PG-3G DC LINE

NOISE FILTER

PG-2N DC POWER CABLE

RC-10 REMOTE CONTROLLER

DIGITAL RECORDING UNIT

DRU-1 .

/<■

MB-201 MOBILE MOUNTING

BRACKET

PS-50 HEAVY DUTY

DC POWER SUPPLY

■ PS-430 DC POWER SUPPLY

RC-20

REMOTE CONTROLLER

MB-12 MOBILE MOUNTING BRACKET

IF-20 INTERFACE

For Example

Remote controller

RC-20

PG-4J EXTENSION CABLE KIT

Transceiver

Extension cable PQ...4J

kit

PG-4H INTERFACE

CONNECTING CABLE

Interface connecting cable

PG-4H

nstaliing accessories

CAUTION

1. Before installation , be sure to disconnect the DC power supply,or battery, or damage may occur the

equipment.

2. You can not install the digital recording unit(DRU-

1) and the DTMF unit togetner.

You should choose one unit to install.

Digital Recording Unit DRU-1

1. Remove the 2 screws se curing the Top cover. Carefully remove the top cover. (Fig. 1)

CTCSS unit TSU-6

The use of the optional sub-audible tone decoder TSU6 allows CTCSS (Tone squelch) operation. When this op tion is active squelch will only open when the proper tone is received.

Installation

1. Remove the 2 screws secur ing the Top cover.

2. Carefully remove the top cover.. (Fig.l)

3. Remove the backing from the small cushion provided with the TSU-6 and attach

it to the back of the TSU-6

as shown in Fig. 2.

4. Attach the cable from TSU-6 as shown in Fig. 2.

5. Remove the backing from the other side of the small cushion and attach the TSU-6 to the transceiver as

shown.

6. Replace the cover and tighten the screws to

complete the installa tion. Fig. 2

Cushion

Detent

Fig. 1

TSU-6 unit

Attach the cable.

2. Attach the three cables from the DRU-1 in the transceiver as shown in Fig. 3. Don’t forget to at tach the TSU-6 as shown if you are installing this unit at the same time (Fig. 4).

3. Tighten the screws (fig. 5).

4. Replace the cover and tighten the screws to complete the installa tion.

Fig. 3

TSU-6

Attach the cushions

Route the wiring

Fig. 4

Fig. 5

DTMF unit DTU-2

1. Remove the 2 screws securing the Top cover.

2. Carefully remove the top cover. (Fig.l )

3. Remove the backing from the small cushion provided with the DTU-2 and attach it to the back of the DTU-2 as shown in Fig. 2

4. Plug the three connectors into the sockets in the units.

5. Attach the cable from DTU-2 as shown in Fig. 2 and 3.

6. Replace the cover and tighten the screws to complete

the installation.

OInstalling TSU-6 and DTU-2

DTU-2

Attach these units on the top of VCO shield (Fig.3).

REMOTE CONTROLLER RC-10

To operate the transceiver with the RC-10 press and hold the CALL key on the transceiver and then turn on the POWER switch.

To select the CALL channel when using the RC-10 press the F key on the RC-10 and then the VFO key.

Please refer to the Instructions provided with the RC-10 for a description of the other RC-10 functions.

©Keyboard

Can be used to select the transmit/receive frequen cies (0 to 9, AandT keys), to select memory channels (1 to 10), and to select channel 11 or subsequent

channels during memory calling ( A and Vkeys).

®F (Function) key

The following functions can be controlled by combin ing the F key with other keys. F.l F.2

ALT function is on (TM-541A/E only). When the transceiver squelch is on, the squelch is switched in or out each time this

key is pressed.

F.3

The shift can be switched to +, -, and sim plex each time this key is pressed.

F.4

REV (reverse) is turned on and off each

time this key is pressed.

F.5

The TONE and CTCSS functions are turned on and off each time this key is pressed.

F.7

The memory channel lockout is turned on and off each time this key is pressed.

F.8

The RC-10 keys are locked and unlocked each time this key is pressed.

F.O

Cotrols switching to duplex using two transceivers.

F.VFO

The call channel is turned on and off each time this key is pressed.

Indicates the transmit/receive frequencies and other

conditions.

(Dm key

Used to store data in a memory channel. Data cannot be stored in memory channel 11 or subsequent channels by the RC-10, but it can be stored in the transceiver. (DVOLMAIN/RMT switch When this switch is set to the VOL MAIN position, the transceiver volume is controlled by the VOL control on the transceiver. When the switch is set to the RMT posi tion, the transceiver volume is controlled by the VOL

UME A and ▼ keys on the RC-10. (6) A/B switch This switch selects the transceiver to be controlled re

motely when two transceivers are connected. The

switch is ineffective when only one transceiver is con

nected. (7) VFO/M key

Each time this key is pressed, VFO and memory alter

nately. ®SCAN key

Turns the scan operation on and off. (DVOLUMEkey

When the VOL MAIN/RMT switch is set to the RMT posi

tion, the transceiver volume can be adjusted.

The transceiver volume increases while the A key is

■Volume set switch The handset speaker volume can be set to one of three levels. This switch is independent of the transceiver VOL control and VOLUME A and ▼ keys.

■PTT (transmit) switch The transceiver transmits while the key is held down. When the switch is pressed during scanning, the scan operation is stopped.

■ Microphone

Functions that do not operate when the RC-10 is con nected.

1. DTSS and paging functions

2. DIM setting function

3. Automatic power-off functions

4. Functions other than the PTT switch, UP/DWN key, and the microphone when connected to RC10 connector B

For details, see the RC-10 Instruction Manual.

REMOTE CONTROLLER RC-20

To change control to the RC-20, connect the RC-20, hold down the transceiver VFO/M^V key, and turn the power switch on.

Before starting operation, read the RC-20 In struction Manual.

Functions that do not operate when the RC-20 is connected

1. DTSS and paging functions

2. DIM setting function

3. Automatic power-off functions

The other functions are the same as the TM231/431/531 functions described in the RC-20 Instruction Manual.

KENWOOD

Kenwood TM-441A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual