Kenwood TM-621A User manual

COO/ANAD
144/220MHz FM DUAL BANDER
TM-621A
144/440MHz FM DUAL BANDER
IM-721A
144/430MHz FM DUAL BANDER
IM-721A
TM-721E
INSTRUCTION MANUAL
KENWOOD CORPORATION
©PRINTED IN JAPAN BS0-8225-10(K, M, T.W)(T)
89/12 1110987654321 88/12111098

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-621A : 144/220 MHz FM DUAL BANDER
TM-721A : 144/440 MHz FM DUAL BANDER
(U.S.A. version)
_TM-721A : 144/430 MHz FM DUAL BANDER
(Other market)
TM-721E : 144/43Q MHz FM DUAL BANDER
(with Tone Burst for U.K. version)
The following explicit definitions apply in this manual:
Note : If disregarded, inconvenience only, no risk of
equipment damage or personal injury.
Caution : Equipment damage may occur, but not per-
sonal injury.
Illustrations show the TM-721A.

CONTENTS
Pes
BEFORE OPERATION ...............202000csssceceeeees 4
SPECIFICATIONS and ACCESSORIES ............ 6
INSTALLATION INSTRUCTIONS ................... 7
OPERATION joss csicccccecocveccsocnvetsvecseecsevsesseess 10
OPERATING CONTROLS
RECEIVER OPERATION. .......sccccecceccessecscccees 15
Reception
Frequency Selection .......ccssessececeeeceeseneees 16
Frequency Step Selection........scesesescereseees 17
A.B.C. (Automatic Band Change) ...........000. 18
Beep Tone
TRANSMITTER OPERATION .......sccceessssceeenes 19
REPEATER OPERATION.......... snedeveelectenessnie 19
Transmitter Offsets
Reverse Function
Tone Operation
Autopatch (U.S.A. version only)......sss+seeeees 21
MEMORY isaac ccncsseccossnstceacciacnccssdesscsdsreceses 22
Microprocessor Memory Back-up
Microprocessor Initialization
Memory Channel
Memory Contents
Memory Entry .....cscccsccsccccecccssssrscecesssas 23
Simplex/Normal SHIFT
Odd Split Channel
Call Channnel......cccccssscssscessccesccessesens 25
Memory Recall
Memory Shift
Scan Options
Programmable Band Scan/Band Scan
Memory Channel Scan
Hold Resume Programming
Priority Alert .....ccccesceccscceccssesenccsvecensuaes 27
Memory Channel Lockout
BLOCK DIAGRAM
and SCHEMATIC DIAGRAM "°°" another sheet
MAINTENANCE ............ccccccscesscccrsescncnsscnens 28
In Case of Difficulty .......ccccsccssscescsscacessaceers 29
OPTIONAL ACCESSORIES. ............scecscsesenees 31
CTCSS unit TSU-6 (U.S.A. version) .....:.cssseees 33
REMOTE CONTROLLER RC-10.........sseeeecsseees 34
REFERENCE ..........00ceeccscccsecestsasecenrsscceeeees 37

1. BEFORE OPERATION
Safety precautions
Never remove the case unless instructed to do so in this In-
struction Manual. If the internal parts are touched acciden-
tally, a serious electric shock might occur.
Never touch internal parts.
If a metal object, such as a hair pin or a needle, comes into
contact with the power socket on the rear panel, a
dangerous electric shock may result. Never permit children
to put anything, especially metal objects, inside this unit.
The power requirement is 13.8 VDC.
Never attempt connection to a 24 VDC source.
DC Power Supply:
Touching the power plug when your hands are wet may
result in a serious electric shock.
6° *\ Never touch with wet hands.
[DQ aN
DC Power Supply:
Never pull, bend or extend the power cord. This could
damage the power cord, resulting in a broken cord or short-
circuit.
Always grasp the plug.

Installation notes
Do not place this unit in a location that is exposed to direct
sunlight, near a heating appliance, etc.
O=
cao
Do not store or use the unit in a dusty location or in a moist
atmosphere. Select a location where there is good ventila-
tion.
In case of an abnormal odor
If an abnormal odor or smoke is detected, immediately turn
the power OFF and pull out the power cord. Contact your
dealer or nearest Service Station.
oye
(gen
To maintain good ventilation, do not put books or papers on
the unit. Position the unit at least 10 cm away from the
walls.
Cleaning
Do not use volatile solvents such as alcohol, paint thinner,
gasoline, benzine, etc. to clean the cabinet. Use a silicone
cloth or a clean dry cloth.
Silicone cloth Thinner Benzine

2. SPECIFICATIONS AND ACCESSORIES
2-1. SPECIFICATIONS
Specifications
wa] T™721E | TMs21A
Other markets :
U.S.A. version | Other mark
Frequency range
144 to 148 MHz|144 to 148 MHz| 144 to 148 MHz|144 to 148 MHz|
1438 to 460 MHz|430 to 440 MHz|430 to 440 MHz|220 to 225 MHa
FSE (FM)
20°C
te
F
to
+
140°F)
150x
60x
219
mm
(6.9"
x2"
x8.6")
ria
1.8
kg
(3.97
ibs)
144 Miz: 45 W, 220 MHz: 25 W,
Sw
Reactance modulation
Less than - 60 dB
£5 kHz
frequency
Audio distortion (at 60%
modulation)
Less than 3% (300 to 3000 He)
‘Microphone impedance
Circuitry
U.S.A. version
Intermediate
144 MHz: 16.9 MHz/465 kHz,
220 MHz: 30.825 MHz/458 kHz,
440 MHz: 21.6 MHz/455 kHz
frequency
Other market
144 MHz
430 MHz:
Ser
;ty(12
4B
SINAD)
144 Wiz: Loge than 0.2
‘MHz: Less than 0.18 aV,
30/440 NAH: v.
220
Lass than 0.16
Solectivity
@ ohms foad (5% distortioni
Notes:
8 ohms
1. Circuit and ratings are subject to change without notice due to ad-
vancement in technology.
2. *: Recommended
1 minute
duty cycle:
: Transmission, 3 minutes : Reception
2-2. ACCESSORIES
Unpack your new transceiver carefully, and con-
firm that the accessories listed below are included
in the box.
MC-48B DTMF Microphone
(U.S.A.
only)...
.-T91-0359-15
.....
1
ea.
or
Dynamic Microphone...... 791-0365-15 .....1 ea,
Microphone Hook
(U.S.A,
only)...
eee
-.J20-0319-24,.....1
ea.
Self
tapping
Screw
(U.S.A.
only)
.
-N46-3010-46.....2
ea.
Mobile Mounting Kit .......N99-0318-05
Bracket...... seatereeseesesS29-0418-03,
SEMS Screw . -NO9-1530-05
Self tapping Screw. .....NO9-0335-05
Flat Washer...
DC Power Cable . -E30-2111-05
Fuse (10A).... -FO5-1031-05..
Instruction
Manual
.
-B50-8225-XX
Warranty Card
After unpacking
Shipping container:
Save
the
boxes
and
packing
in
the
event
your
unit
needs
to
be
transported
for
remote
operation,
main-
tenance,
or service.

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.
1. Install the bracket using
the supplied flat washers 5.
and self tapping screws (4 __ washer ——~
Self tapping — 4
pcs. each). . ccroin
2. Attach the transceiver
loosely using the SEMS
screws (4 pcs.).
3. The angle of the bracket
may be adjusted to any of
9 possible viewing angles.
Select the desired angle. Fig. 1
(Fig. 2)
4. Hold the transceiver in
place and tighten the 4
SEMS screws using a
wrench or screwdriver.
3-2. CONNECTIONS
3-2-1. Mobile Installations
TM-721A/721E:
The MA-4000 dual band
antenna is recommended.
To 144 MHz antenna
¥ External Speaker
¥ Tre SP-40 or
the SP-50B is
bln
Oy
Duplexer
To 220 MHz To 430/440 MHz
TM-621A: 4 TM-721A/721E:
antenna antenna
To 144 MHz To 430 MHz
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.
|
i
i
I
i.
:
i

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 bat-
tery.
Make sure the positive (+) and negative (—) lead polarity is correct
when connecting to the battery.
Engine compartment «—-1—- Passenger compartment
Red Fuse
To the
transceiver
Chassis or
fire wall
@ if the wiring hole in the fire wall or chassis is too small,
disassemble the fuse holder to thread the wire through the hole.
Set = a
Thread like this
compartment
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.
2.
Never connect the AC power cable to the AC outlet until
all other connections have been made.
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.
. 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)
f° To 144 MHz antenna
v
PS-430
Fee
Leases
or
TM-621A
: To 220 MHz antenna
TM-721A/721E : 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
connection. If the antenna is far from the transceiver the
use of low loss coaxial cable, such as RG-8U is recom-
mended. Match the impedance of the coaxial cable and
that of the antenna so that the SWR is Jess than 1.5 'to 4.
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: ABABA
For protection against fire, electric shock, personal injury,
or damage to the radio, use a lightning arrester in your
antenna lines.

i
4.
OPERATION
4-1. OPERATING CONTROLS
4-1-1. Front Panel
‘O)
@
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 (TM-621A/721A)
The CALL key selects the CALL channel of the MAIN
frequency band. The frequency has been factory-set as
follows, but may be reset to any desired frequency. (See
CALL Channel P25.)
TM-621A ; 220.000/144.000
T™M-721A
U.S.A. version ; 440.000/144.000
Other market 3; 430.000/144.000
TONE key (TM-721E)
European version: This key is used to transmit a Tone
signal. When the key is depressed the repeater con-
trol signal of 1750 Hz is activated.
U.K. version: This key is used to activate the
1750 Hz tone burst.
®
Sa axe yy?
M$
oN
°
La
VFO key
This key is used to return to VFO operation after oper-
ating in the MR (Memory Recall), or CALL Channel mode
(TM-621A/721A only).
The MAIN tuning control will increase frequency in the
selected step size, the tone frequency (TM-621A/721A
only), and/or the frequency step.
MR/M 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
memory channel in this mode.
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 SOL threshold
level of the MAIN frequency band.