Kenwood TM-721A User manual

GOO/MNA»
144/440MHz FM DUAL BANDER
IM-721A
144/430MHz FM DUAL BANDER
IM-721A
TM-721E
INSTRUCTION MANUAL
KENWOOD CORPORATION

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 piace the transceiver where the heat sink (rear
panel) might come in contact with plastic or vinyl surfaces.
The following explicit definitions apply in this manual:
Note 2 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
PWN>
INSTALLATION INSTRUCTIONS ..............00008
OPERATION.........:ccccccecnsccescncsarectsaseceascees
OPERATING CONTROLS
RECEIVER OPERATION. ..ccsccccescacccesscusccensces
Reception
Frequency Selection ....ccccccsreccssenccnvecscccae
Frequency Step Selection........ccccsssncceeesace
A.B.C. (Automatic Band Change) .......sesssees
Beep Tone
TRANSMITTER OPERATION ......ccccccssactecceees
REPEATER OPERATION ......cccessesecccsscccesecees
Transmitter Offsets
Reverse Function
Tone Operation
Autopatch (U.S.A. version only) ..cccsseoesseeoes
MEMORY .....ccccecscctecsccuccscuvesscevorseeeentscces
Microprocessor Memory Back-up
Microprocessor Initialization
Memory Channel
Memory Contents
Memory Entry .....cccscsecesccunnsscenccerscceueres
Simplex/Normal SHIFT
Qdd Split Channel
Call Channel.......cecccccsecccsestsecsscernacses
Memory Recall
Memory Shift
Scan Options
Programmable Band Scan/Band Scan
Memory Channel Scan
Hold Resume Programming
Priority Alert .......scccececesceseccrscentcsvercenses 27
Memory Channel Lockout
BLOCK DIAGRAM
and SCHEMATIC DIAGRAM 77°77" another sheet
MAINTENANCE ...........00.0cecsnsecsseccsceressensens 28
In Case of Difficulty ..........cccecescsscesesseeneneeee 29
OPTIONAL ACCESSORIES.............0:c+ececceceas 31
CTCSS unit TSU-6 (U.S.A. version) .....cccsenseees 33
REMOTE CONTROLLER RC-10.........0sesenccseeee 34
REFERENCE .............ccscesceeseecccscvcvccecnsvrscres 37

1. BEFORE OPERATION
Safety precautions The power requirement is 13.8 VDC.
Never remove the case unless instructed to do so in this In- Never attempt connection to a 24 VDC source.
struction Manual. If the internal parts are touched acciden-
tally, a serious electric shock might occur.
Never touch internal parts.
DC Power Supply:
Touching the power plug when your hands are wet may
result in a serious electric shock.
. _ . ~\Gnv”
If a metal object, such as a hair pin or a needle, comes into na \
contact with the power socket on the rear panel, a oT. Never touch with wet hands.
dangerous electric shock may result. Never permit children | ON
to put anything, especially metal objects, inside this unit.
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.
rn ,
(MPBEN
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.
oo
~
Do not store or use the unit in a dusty location or in a moist
atmosphere. Select a location where there is good ventila-
‘
-s
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.
Ox
(ges
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
Model
TM-721A4
TM-721E
. Other markets
Specifications U.S.A. version version
144 to 148 MHz |144 to 148 MHz] 144 to 146 MHz
Frequency range 438 to 450 MHz |430 to 440 MHz | 430 to 440 MHz
Mode F3E (FM}
Antenna impedance 50 ohms
3 Power requirements 13.8 VOC +15%
S Ground Negative
& | [Transmit mode (Max.} O5A
5-5/ Receive made with no
58 Sena 0.6 A
Operating temperature 20°C to +60°C (-4°F to +140°F)
Dimensions (W x H x 0} "yO" ™
(Projections included) 180x 50x 219 mm (5.9%x 27x 8.6%}
Weight 1.8 kg (3.97 Ibs)
Output | HI 144 MHz: 45 W, 430/440 MHz: 35 W
power = [ LOW 5 Ww
FY Modulation Reactance modulation
€ | Spurious radiation Less than —60 dB
¢ Maximum frequency deviation +5 kHz
& | Audio distortion {at 60%
modulation) Less than 3% {300 to 3000 Hz)
Microphone impedance §00 to 600 ohms
Circuitry Double conversion superheterodyne
: 144 MHz: 16.9 MH2z/455 kHz,
intermediate | O=* version 440 MHz: 21.6 MHz/455 kHz
frequency 144 MHz: 10.7 MH2/455 kHz,
-, Other market 430 MHz: 30.825MH2/455 kHz
2 Sensitivity(12 dB SINAD) MMizeLess than 0.2 nV .450/440iiizsLess_ then 0.16 7
oe
a yt —6 dB: More than 12 kHz,
& | Selectivity ~60 dB; Less than 24 kHz
Spurious response Better than 60 dB
Squelch sensitivity Less than 0.09 gV
Output More than 2 W across 8 ohms load (5% distortion)
External speaker impedance 8 ohms
Notes:
1. Circuit and ratings are subject to change without
notice due to advancement in technology.
2. * : Recommended duty cycle:
1 minute : Transmission, 3 minutes : Reception
2-2. ACCESSORIES
Unpack your new transceiver carefully, and confirm that
the accessories listed below are included in the box.
MC-48B DTMF Microphone
(U.S.A, only) ............. peceeeeeeee T91-0359-05....1 ea.
or
Dynamic Microphone ...... seeeeeeeee 1 91-0365-15....1 ea.
Microphone Hook (U.S.A. only)...J20-0319-24 ....1 ea.
Self tapping Screw (U.S.A. only) .N46-3010-46....2 ea.
Mobile Mounting Kit ;
Bracket ........cscsceceveer even ree »-» JZ9-0418-03 ....1 ea.
SEMS Screw ....... venta eeeeeecene ..NO9-1530-05....4 ea.
Self tapping Screw ........-...06 NO9-0335-05....4 ea.
Flat Washer..........++ be ereeeeere ba eseeeeeeeee 4 ea.
DC Power Cable.............. seeereee-EGO-2111-05 ....1 ea.
Fuse (10A).......-c0esreeeeeeee beeeerees FO5-1031-05 ....1 ea.
Instruction Manual..............6. ....B50-8225-00...1 copy
Warranty Card (U.S.A. only)... veseel C8,
After unpacking
Shipping container:
Save the boxes and packing in the event your unit needs to
be transported for remote operation, maintenance, or ser-
vice.

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
and
self
tapping
screws
(4
5
washer
—
pcs.
each).
.
ne
capping
—4
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.
To 144 MHz To 430 MHz
3-2. CONNECTIONS
3-2-1. Mobile Installations
The MA-40C0 dual band
. To 144 MHz antenna
antenna is recommended.
4 External Speaker(_]
The SP-40 or
» the SP-5OB is Oe
i recommended.
Duplexer
| To 430/440 MHz
antenna
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.
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 cornpartment ~—{—+~ Passenger compartment
Red Fuse
(
To the
transceiver
Select a location where
the power cable is pro-
tected from heat, mois-
ture or abrasion wi
securing the cable.
4
Chassis or
fire wall
by using a grommet.
@ If the wiring hole in the fire wall or chassis is too small,
disassemble the fuse holder to thread the wire through the hoie.
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 until
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)
£ To 144 MHz antenna
PS-430 SP-430
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 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:
For protection against fire, electric shock, personal injury,
or damage to the radio, use a lightning arrester in your
antenna lines.

4.
OPERATION
4-1. OPERATING CONTROLS
4-1-1. Front Panel
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AB MUTE
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-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.)
U.S.A. version ; 440.000/144.000
Other market ; 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.
VFO key
This key is used to return to VFO operation after
| |
@ BY
operating in the MR (Memory Recall), or CALL Channel
mode (TM-721A only).
The MAIN tuning control will increase frequency in the
selected step size, the tone frequency (TM-721A
only), and/or the frequency step.
MR/M key
This key is used to select Memory Recall operation
after 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
transceiver.
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.