Kenwood TM-631A User manual

GOONS)
144/220MHz FM DUAL BANDER
TM-631A
144/440MHz FM DUAL BANDER
IM-731A
144/430MHz FM DUAL BANDER
IM-731A
TM-731E
INSTRUCTION MANUAL
KENWOOD CORPORATION
©PRINTED IN JAPAN B50-8295-00(K, M, P, W)(T)
90/12 1110987654321 89/121110987654

Thank you for purchasing this new transceiver.
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-631A : 144/220 MHz FM DUAL BANDER
TM-731A : 144/440 MHz FM DUAL BANDER
(U.S.A. version)
TM-731A : 144/430 MHz FM DUAL BANDER
(Other market)
TM-731E : 144/430 MHz FM DUAL BANDER
The following explicit definitions apply in this manual:
Note : If disregarded, inconvenience only, no risk of
equipment damage or personal injury.
: Equipment damage may occur, but not per-
sonal injury.
Caution
CONTENTS
Poe
BEFORE OPERATION ...i..00:scscceccsecccneneneroes 3
SPECIFICATIONS and ACCESSORIES io
INSTALLATION INSTRUCTIONS .. 6
IPERA TIONS. cvcrcteexsegetistacrsentvevesvacrasansneind 9
OPERATING CONTROLS
RECEIVER'OPERATION. .iscscsscessccriscoesstuaeens 15
Reception
Frequency Selection
Frequency Step Selection...
A.B.C. (Automatic Band Change) ...
TRANSMITTER OPERATION
REPEATER OPERATION
Transmitter Offsets
REVErse|FUNCHON scssicvsiesieneveuaisooruwiaveone 20
Tone Operation
Autopatch (U.S.A. version only)......ssseseeee 22
MEMORY 55 sseccdhtcacatea cocaxtercssane atveesaunsee 23
Microprocessor Memory Back-up
Microprocessor Initialization
Memory Channel
Memory Contents
Memory Entry sresesisscusecessreransxcestacaniecuan 24
Simplex/Normal SHIFT
Odd Split Channels
Call, CHANNEL ses ovsenaedes os sseasnancescewene 26

Memory Recall
Memory Shift
SCAN cscnanvesnarsascdawsnanaasnienrnsastensienpebendace 27
Scan Options
Hold Resume Programming
Programmable Band Scan/Band Scan
Memory Channel Scan....s.scsseceseneeeeeeeeees 28
Double Scan
Priority Alert
Memory Channel Lockout.....esssseeesseereneee 29
Tone Alert System
BLOCK DIAGRAM
and SCHEMATIC DIAGRAM""""""" another sheet
MAINTENANCE
In Case of Difficulty ....
OPTIONAL ACCESSORIES ............csceeeeseeees 32
CTCSS unit TSU-6
REMOTE CONTROLLER RC-10
ACCESSORIES wvcsisinssinisvnnsncnontessseinas’aeciase 35
1. [A waRNiNe] BEFORE OPERATION
TO PREVENT ELECTRIC SHOCK, FIRE AND OTHER INJU-
RY. PLEASE NOTE THE FOLLOWINGS:
To avoid risk of electric shock, under no circumstances
should the unit be opened:
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 of excessive dust, high hu-
midity or on unstable surfaces.
Do not drop pieces of metal, needles, coins and other elec-
trically conductive materials into the unit.
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 your 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 AND ACCESSORIES
2-1. SPECIFICATIONS 2-2. ACCESSORIES
lode! 1-731,
Giharmakes| TM7aIe TM-631A J
Specifications
U.S.A,
version
Version
Unpack
your
new
transceiver
carefully,
and
con-
744 to 148 MHz|144 to 148 MHz|144 to 146 MHz|144 to 148 MH; i i i j
Frequency range PES tape bia beep a ia ten eee firm that the accessories listed below are included
Mode — F3€ (FM) in the box.
‘Antenna impedance 50 ohms
Pe it it! 13.8 VDC +15% .
ct es a MC-44DM Microphone....791-0380-15 .....1 ea.
§ [E | Tranamit mode Less than 11 A (U.S.A. and CANADA)
= [5s Besene mode with no Less than 0.6 A or
Operating temperature =20°C to +60°C (-4°F to +140°F) MC-44E Microphone....... 7T91-0382-15.....1 ea.
Dimensions (WH 201 160x 60x 219 mm (8.97 x2" x 8.6") (U.K. and Europe)
Weight 1.8 kg (3.97 Ibs) oF
Output Hi 744 MHz: 50 W, 220 MHz: 25 W, 430/440 MHz: 35 W Microphone ..........csseeeeee T91-0379-15..... 1 ea.
‘
aa
Low
=
ae
(Other
market)
lodulation feactance modulation r
Sauna Taaavon leer Seas Microphone Hook..........« J20-0319-24......1 ea.
Maximum frequency deviation £5 kHz (U.S.A. and CANADA)
F* | Audio distortion (at 60% Less than 3% (300 to 3000 Hz) Self tapping Screw......... N46-3010-46.....2 ea.
Microphone impedance 500 to 600 ohms (U.S.A, and CANADA)
Circuitry Double conversion superheterodyne Bracket iiiiisiicssscasceas -..J29-0418-03.
144 MHz: 16.9 MHz/455 kHz, i i i - |
U.S.A. version 220 MHz: 30.825 MHz/485 kiiz, Mobile Mounting Kit .......N99-0318-05 .
Intrmeckat 440 MHz: 21.6 MHz/455 kHz Wrench -W01-0414-05 ....1 ea.
juency 144 MHz: 10,7 MHz/455 kHz,
5 Other market Ano the so aoptic/abe Kriz DC Power Cable -E30-2111-05 .....1 ea.
3 Sensitivity(12 dB SINAD) 144 MHz: Less then 0.2 nV, 220 MHz: Less than 0.18 2V, Fuse (15A) -FO5-1531-05...... 1 ea.
iz:
Less
than
0.16
.
€
%
| cores ZG ilaiddera than TZkHz, Instruction Manual -B50-8295-XX ..1 copy
letteavity — 80 dB: Less than 24 kHz Warranty Card. 1 ea,
Spurious response Better than 60 dB (U.S.A. CANADA and Europe)
‘Squelch sensitivity Less than 0.09 »V J 4
Output More than 2 W across 8 ohms load (5% distortion) i
External speaker impedance 8 ohms After unpacking
Notes: Shipping container:
1. Circuit and ratings are subject to change without notice due to ad- Save the boxes and packing in the event your unit
vancement in technology. needs to be transported for remote operation, main-
2. *Recommended duty cycle:
ri St, * . tenance, or service.
1 minute Transmission, 3 minutes Reception -

3. INSTALLATION INSTRUCTIONS
3-1. 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.
Ts
Install the bracket using
the supplied flat washers
and self tapping screws (4
pcs. each).
. Attach the transceiver
loosely using the SEMS
screws (4 pcs.).
. The angle of the bracket
may be adjusted to any of
9 possible viewing angles.
Select the desired angle.
(Fig. 2)
. Hold the transceiver in
place and tighten the 4
SEMS screws using a
wrench or screwdriver.
Flat
washer
Self tapping
screw
[}
3-2. CONNECTIONS
3-2-1. Mobile Installations
External Speaker
The SP-41 or
TM-731A/731E:
The MA-700 dua! band
antenna is recommended.
To 144 MHz
To 144 MHz antenna
the SP-50B is
Duplexer
To 220 MHz To 430/440 MHz
A
+
t TM-631A: y TM-731A/731E:
antenna — antenna
To 430 MHz
Cautions: —
te
2.
Before installing the power cable, be sure to remove the
negative lead from the battery for safety.
After installation and wiring, be sure to double check for
correct installation before reconnecting the negative lead
to the battery terminal.
. 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.
. After completing the wiring, wrap the fuse holder with
heat resistant tape to protect against heat and moisture.
. 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.
Use of the cigarette lighter socket can lead to poor connec-
tion, and 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
when connecting to the battery.
Engine compartment Th Passenger compartment
Fuse
Red
y
To the
transceiver
Select a location where
the power cable is pro-
tected from heat, mols
ture or abrasion when
securing the cable.
Make sure the cable does
not directly contact the
edge of the hole by using
4 ‘a grommet.
Chassis or
fire wall
Battery
™ f the wiring hole in the fire wall or chassis is too small, disas-
semble the fuse holder to thread the wire through the hole.
From passenger
compartment
Thread like this
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).
3-2-2. Fixed Station
A regulated DC power supply (13.8 VDC capable of sup-
plying at least 10 Amperes) is required. The PS-430 and the
PS-50 are recommended.
CAUTION:
1. Never connect the AC power cable to the AC outlet un-
til all other connections have been made.
2. Before connecting and disconnecting the power connec-
tor, 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 polari-
ty must be correct. The power cable is color coded:
Red -— + (Positive polarity)
Black — — (Negative polarity)
\o/ (a SP-430
HGOUUNONNONGONGA
Pin nIniUATOO ARON
+
TM-631A + To 220 MHz antenna 3
TM-731A/731E : To 430/440 MHz antenna —

3-2-3. Antenna
The type of antenna that is used will greatly affect the per-
formance of the transceiver. Use a properly adjusted anten-
na, 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 con-
nection. 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 protec-
tion circuit in the transceiver will activate if the SWR is par-
ticularly 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:
For protection against fire, electric shock, personal injury,
or damage to the radio, use a lightning arrester in your an-
tenna lines.

4.
OPERATION
i L
+t
CONTROLS
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4-1-1. Front Panel Hen a
F Lak ST 19h oa gh ABE — = eee ®@
Main Tuning control
This control is used to select the desired transmit/
receive frequency, Memory Channel, Frequency Step,
Tone Frequency, and Scan direction of the MAIN fre-
quency band.
CALL key
The CALL key selects the CALL channel of the MAIN
frequency band. The frequency may be reset to any
desired frequency. (See CALL Channel P26.)
VFO key
This key is used to return to VFO operation after oper-
ating in the MR (Memory Recall), or CALL Channel
mode. The MAIN tuning control will increase frequen-
cy in the selected step size, the tone frequency, and/or
the frequency step.
Press and hold the key for longer than 1 second to in-
itiate VFO scan. Press the key after scan has been in-
itiated will cause scan to stop.
MR key
This key is used to select Memory Recall operation af-
ter operating in the VFO or CALL channel mode. The
MAIN Tuning control may be used to select the desired
2)
@ Microphone audio—_
@ PTT (STBY) switch
memory channel in this mode.
Press and hold the key for longer than 1 second to in-
itiate MR scan. Press the key after scan has been in-
itiated will cause scan to stop.
VOL control/Power switch
The volume control and power switch are combined.
Rotating the control clockwise will turn ON the tran-
sceiver.
Advancing the control further clockwise will increase
the total volume of two bands.
The BALANCE control proportions the volume among
the two bands.
MAIN SQL control
This control is used to select the desired SQL threshold
level of the MAIN frequency band.
Microphone connector
Plug the standard or optional microphone into this jack.
GND (PTT)
@ GND (Microphone)
RX Audio output
(Approx. 100 mV/10 kQ)
@
DOWN
©
8
V/Max.
50
mA
@ up
Front view

10
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ALB. C. DUAL BAND
CTCSS. SEI
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MHz key
This key is used to change frequency in 1 MHz steps
during VFO operations.
Pressing and holding the key will continuously change
the frequency in 1 MHz steps.
Sub Tuning control
This control is used to select the desired receive fre-
quency and Memory channel of the SUB band.
LOCK switch
This key will deactivate all functions except the PTT
switch.
BALANCE control
This control proportions the total audio volume among
the two bands.
MAIN position : Audio only from the MAIN band
Center position : Equal audio from both bands
SUB position : Audio only from the SUB band
SUB SQL control
This control is used to select the desired SQL threshold
level of the SUB band.
LOW key
This key is used to select the transmit output power
level as follows:
HI (no indicator): 144 MHz:50 W/220 MHz:25 W/
430 MHz:35 W
LOW : 5W
DIM key
This key is used to select either high or low intensity
of both the LCD display and control's illuminations.
For the key to function, it must be pressed within 5 se-
conds after pressing the F key.
A.B.C. (Automatic Band Change)
When this key is pressed, the contents of the SUB band
will be transfered to the MAIN band whenever a signal
is received at the SUB band antenna, which is strong
enough to open the squelch. The contents of the MAIN
band are transfered to the SUB band at the same time.
DUAL band
This key is used to turn the SUB band ON or OFF.
CTCSS SEL (With the TSU-6)
Pressing the key within 5 seconds of pressing the F key
will switch the CTCSS function alternately between the
UHF band and VHF band. (To activate the CTCSS func-
tion use the CTCSS key.)
During scan press the key to initiate double scan.
BAND key
This key is used to change the contents of the MAIN
band.