Kenwood TM-641A User manual

CGOO/ANAD
144/220 MHz FM MULTI BANDER
TM-641A
144/440 MHz FM MULTI BANDER
TM-741A
144/430 MHz FM MULTI BANDER
TM-741A
144/430 MHz FM MULTI BANDER
TM-741E
INSTRUCTION MANUAL
KENWOOD CORPORATION
©PRINTED IN JAPAN B62-0082-10(K)(T)
92/12 111098765432191/12 11109876

Thank you for purchasing this new transceiver.
IMPORTANT:
Please read this instruction manual carefully before
placing your transceiver in service.
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-641A: 144/220MHz FM MULTI BANDER
(U.S.A.version)
TM-741A: 144/440MHz FM MULTI BANDER
(U.S.A. and Canadian version)
TM-741A: 144/430MHz FM MULTI BANDER
(General markets)
TM-741E: 144/430MHz FM MULTI BANDER
(European markets)
NOTE: If disregarded, inconvenience only, no
risk of equipment damage or personal
injury.
CAUTION: Equipment damage may occur, but not
personal injury.
Save this instruction manual.
Illustrations show the TM-741A.
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
Bh
MEMORY.
oo
cscce
4
saess
aicines
sions
a
croue
wate
oe
29
J
BEFORBIOPERATION.
.
ossx
nase seee
yew
sos
5
Microprocessor
Memory
Back-up
.....
29
2.
SPECIFICATIONS
and
ACCESSORIES
......
6
Microprocessor
Initialization
........
29
3.
INSTALLATION
INSTRUCTIONS.
..........
8
Memory
Channels
..................-
30
ds
OPERATION
as:
gece
eas
somadeag
odd
nase
12
Memory
Contents
30
#1
OPERATING
CONTROLS.
wie
ijeieie
ceeeciee
12
Memory
Entry
..........
31
FrontPanel.
es
nese
csiwsines
dated
aca
ante
12
Memory
Channel
Recall
32
Microphone...
ao.
cis
sos
nse
see
vreis
aan
16
Memory
Banks,
........62.etee
eee
e
es
32
Display
Patel
kyiaa
seas
neecearadeares
18
Clearing
Memory
......
0...
sees
ee
ees
35
Rear
Panel
and
Sidecase..........-5.
20
Memory
Shift,
a.
sevecsenms
veusiiea
os
35
4-2.
RECEIVER
OPERATION
..........-..-:
21
AD
SCAN!
sues
sie
ug
¢
ua
@
ud
Mal
saat
WAR
HERE
36
Receiver
Operation
.........0eeseeees
21
Scan
Options
a
©
86
Frequency
Selection
.........
ee
eee
22
Hold/Resume
Programming
.........
36
Frequency
Step
Selection
............
22
Band
SCA.
acai.
ceunscocses
tes
Need
Boe
Moew
37
ProgrammableVFO
Tuning
Limits
...
23
Programmable
BandScan_...
ti,
8
A.B.C.(Automatic
Band
Change)
_......
24
MHz
Sant)
-ajheatainiciace
naan
ou
OO
Band
Selection
..........000esse
ee
eee
25
Memory
Channel
Scan
:
wes
BB
Attenuator
ON/OFF
.............0008
25
CALL
Sean
yaya
suay
cate Hore
Wns
ia
89
ALT
(Automatic
Lock
Tuning)
.......
26
ViMNG
Seam
|
ssececciscsick
asl
..
39
4-3
TRANSMITTER
OPERATION..........
27
Automatic
Memory
Scan
....
saa
189
Transmission
as
see
cee
acces
cites
noire
ane
27
Memory
Channel
Lockout
—.
40
POCAT
EYE
gee
aiok
ban
ER
uate
3
27
4-6
REPEATER
OPERATION
....
41
Time-Out
Timer
(TOT)
..............
28
Transmitter
Offset
=
.....
41
Bandwidth
Selection
..............04.
28
Reverse
Function
—.........
vow
4D
Tone and CTCSS Operation : tne Al
Autopatch Operations ............... 43

B27
SDTSS:
5
sas-cauecveniaies
oats
da
edettac
ns
44
5-3
CLOCK
POSITION
ON
THE
FREQUENCY
DESSCodG)
“Wiis
dof
Dien
tase
BE
tees
44
DISPLAY.
2
neg
aoen
aduntatny
Steen
ae
eae
58
DTSS
CodeSelection
so.
k
seavecuceus
44
Transceiver
F
unction
ON
or
OFF
.......
58
Using
the
DTSS
Function
............
45
Transceiver
Function
OFF
58
Using
DTS
witha
Repeater
0.0...
:
Le
ct
leanne
Poe
an
:
Bei®
PAGING:
23
tonsisirmean
odes
Met
torek
seo
46
Clock
Operation
in
the
Frequency
Display
60
Paging
Code
Memories
..............
47
6.
MAINTENANGE
|
ics
¢
sas
ssse
aces
echuat
omen
61
EodeiSelection;
sacs
deedean
Mallee
ois
47
In
Case
of
Difficulty
.................
62
Code
Transmission
..................
48
7.
OPTIONAL
ACCESSORIES
................
64
Paging
Code
Monitoring
.............
49
CVCSS
MH
(TSUAD
ect
smear
eisic
65
COdeLGCk
Out:
<5.
iaaa
iced
sides
wsode
ate
50
DIMP
unit
DTU)
©
«ch
Phe
aches
65
4-9
TONE
ALERT
SYSTEM.........000.00005
51
Panel
Separation
Kit
(PG-4K,
PG-4L)
68
4:10
AUTOMATIC
POWER
OFF
(APO)
......
52
Bracket.
otisc
eos
s
Aas
Seah
Ra
heed
hoe.
70
412
DIMMER
(DIM)
ci
sie
iciic
cite
llins
ans
52
Band
Wine:
oiseesccisSesteud
sc
atatamees
paces
4-12
BEEP
TONE
LEVEL
ADJUSTMENT....
53
BLOCK
DIAGRAM
and
SCHEMATIC
DIAGRAM
4-13
BEEP
TONE
FREQUENCIES.
...........
Be
wl
ee
naaaiiacten
attended
another
sheet
AYA
KEY
LOCKS
©
cits
eta
iain
a
bsleloteecwe
54
Dit
CHOCKS.
4
sit
loses
tater
atacd
aad
Rowe
bee
dein
55
5-1
CURRENT
TIME
ANDDATE...........
55
Backup
Switeni
cs
irsed
ehteee
diols
wa
55
Setting
the
Current
Time
and
Date
.....
55
5-2
OTHERCLOCK
FUNCTIONS
..........
56
Current
Time,
Calender
and
Stopwatch
in
the
NOTICE
a
‘Piaptarinine
eet
ss
One
additional
band
may
be
installed
using
options
Activating
the
SLEEP
Timer
57
described
in
this
manual.
Operation
instructions
ime
remain
the
same
for
the
radio
when
uses
a
dual
band
or
tri-band
configuration.

1. BEFORE OPERATION
To prevent electric shock, fire and other
injury, please note the following:
Never remove the case unless instructed to do
in this Instruction Manual. If the internal
parts are touched accidentally, a serious
electric shock might occur.
Do not place this unit where it will be exposed
to direct sunlight or close to heating
appliances.
Do not place anything on top of the cabinet.
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 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.
If an abnormal odor or smoke is detected,
immediately turn the power off. 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
144 MHz Band 220 MHz Band 440/430 MHz Band
Frequency U.S.A. and Canada 144 ~148 220 ~225 438 ~450
range MHz Other market 144 ~148 = 430 ~440
G TM-741E 144 ~146 - 430 ~440
E Mode ll F3E (FM)
N Antenna impedance 50
E Operating temperature —20°C~+60°C (—4°F ~ +140°F)
R Power requirements 13.8VDC+15% (11.7~15.8V)
4 Ground Negative
A Transmit mode Less than 11.5A Less than 7.0A Less than 10.0A.
Carrera Receiver mode Less than 1.2A
Frequency stability +10ppm
Dimensions (WH XD) 15050175 mm
Weight 1.6 kg
z Output HI 50W, 25W 35W
A power | MID 10W
N LOW Approx. 5W
= Modulation Reactance modulation
I Spurious radiation Less than —60dB
x Maximum frequency deviation i +5 kHz
E Audio distortion (at 60% modulation) Less than 3%
R Microphone impedance 6000

144 MHz Band 220 MHz Band 440/430 MHz Band
R Circuitry Double conversion superheterodyne
E Intermediate frequency Ist/2nd 10.7 MHz/455 kHz 30.825 MHz/455 kHz 21.6 MHz/455 kHz
€ Sensitivity (12 dB SINAD) Less than 0.16 V (—10 dByu) *
E Selectivity —6dB | More than 12 kHz
I Selectivity —60dB Less than 24 kHz
Vv
Squelch
sensitivity
Less than
0.1
7
V
(—14
dBy)
E Output (5% distortion) More than 2 W (80. load )(5% distortion)
R External speaker impedance 80
NOTE:1. Circuit and ratings are subject to change without notice, due to developments in technology.
2. Recommended duty-cycle: 1 minute Transmission, 3 minutes Reception.
2-2. ACCESSORIES
Unpack your transceiver carefully and confirm that the
accessories listed below are included in the box.
DTMF Microphone ......... T91-0397-XX ..... 1
(U.S.A. and Canada only)
or Microphone ..... ons 5 specs. 2 T91-0398-XX ..... 1
( European version)
or Microphone’... ..cs5 ics T91-0396-XX ..... 1
( General market)
Microphone Hook .......... J20-0319-XX ..... 1
( U.S.A. and Canada only)
Mobile Motintifig Kat .oi..c.J.ecei cole. nielelageysye ensia § ace 1
Bracket a ccwioaemie weno J29-0454-XX
Serew'S@b caccca sees aiaaces N99-0331-XX
Self tapping Screw ..........
(U.S.A. and Canada only)
N46-3010-46 ..... 2
Hex Wremich sie sti awcyororsisnes W01-0414-XX .... 1
DC power Cable ........... E30-3034-XX .... 1
PUse(HSA) coed i va vain wesw y F05-1531-XX .... 1
Instruction Manual ........ B62-0082-XX 1 copy
Quick reference ............ B59-0441-x x 1 copy
Warning sheet ............. B58-1001-* x = 1 copy
Warranty Card (U.S.A., Canada and European version
OTANIW) asana asceo iota cate 3 pv rare Slane SheMet Pate Nee 1
After unpacking
Shipping container: Save the boxes and packing in the
event your unit needs to be transported for remote
operation, maintenance, or service.

3. INSTALLATION INSTRUCTIONS
INSTALLATION
Installing the Microphone and Setting
the Clock Backup Switch
Before installing be sure to turn off the power switch.
3-1-1.
1. Slide the release button on the front panel to the
right. Carefully pull the front panel toward you from
the right, then remove the whole panel unit. Be
careful with the cord connecting the front panel unit
to the chassis. (Fig. 1)
2. Insert the microphone connector into the microphone
socket on the right of the main unit until it clicks.
Make sure the tab on the connector is on top.
Place the microphone cord in the holder groove. (Fig. 2)
BBACKUP SWITCH
Inside the small cover of the front panel unit there is
a Backup Switch to retain clock memory. If you set
the switch ON ,turning off the POWER switch,
disconnecting the power cable or an intermittent
power failure will not erase the clock memories.
cf
. Slide the small cover off of the front panel unit as
shown in the accompaning illustration. (Fig.3)
. Gently lift up on the cable near the grommet.
Set the Backup switch ON. Pay attention to the labelings.
. Push the grommet down into its slot.
. Replace the small cover until it clicks.
. Route the cable as desired
in the slots on the rear of
the front panel.
CONAN
10. Align the hook on the back of the front panel with
the slot on the left of the chassis before replacing the
front panel.
11. Push the front panel toward the chassis until it locks
compplesely Take care not to trap the connecting
cor
The connecting cord is easier to manage when it is
put in the groove on the back of the front panel.
12. Set the date and time ( See page 55 ).
microphone
connector
(Fig. 1)
Backup
Switch
Grommet
(Fig. 3)

3-1-2. Mounting Bracket
Notes
1. When installing the transceiver in a vehicle
consider ease of operation and safety when selecting
the location for the mounting bracket.
2. Install the bracket securely so that it will not come
off due to vibration.
. 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.).
Flat washer
inset
screw
. Adjust the viewing angle of the bracket to the desired
position .
. Hold the transceiver in place and tighten the 4 SEMS
screws using the supplied wrench.
8-2. CONNECTION
3-2-1. Antenna
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
lightning arrestor in your antenna lines for
protection against fire,electric shock,personal
injury,or damage to the radio itself.

3-2-2.
Mobile
Installations
Battery Connections
1,
2.
Cautions
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.
i
he
not
remove
the
fuse
even
if
the
power
cable
is
too
ong.
Make
sure
the
positive
(+)
and
negative
(—)
lead
polarity
is
correct
when
connecting
to
the
battery.
Engine am a Passenger compartment
Red Fuse
Fuse aii x
lect @ location where
the
power
cable
is
pro-
Make
sure
the
cable
does not directly contact
tected from heat, mois-
ture
or
abrassion
when
the
edge
of
the
hole
by
securing
the
cable,
using
a
grommet.
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.
From passenger
compartment
Thread like this
10
Caution
Leave
enough
space
around
the
fan
on
the
rear
panel
for good ventilation.
Connect
the
power
cable
directly
to
the
battery
terminals.
Use
of
the
cigarette
lighter
socket
will
lead
to
poor
connection,
and
will
result
in
poor
performance.
Pay
close
attention
to
the
polarity
of
the
cables
when
connecting
them
to
the
battery.
To Antenna
Built-in Speaker
is switched.
D
TM-741A/741E
440/430 MHz band Lf
J
TM-641A Red OFY
220 MHz band y
=

3-2-3. Fixed Station
A regulated DC power supply (13.8 VDC capable of
supplying at least 12 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
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)
Caution :
Leave enough space around the fan on the rear panel
for good ventilation.
Built-in Speaker
is switched.
To antenna ae
144 MHz band zB
TM NTA |
440/430 MHz
band Rea ® WA,
TM-641A Black ©) ®
220 MHz band
Each band speaker
is switched.
=
=

4. OPERATION
4-1. OPERATING CONTROLS
4-1-1. Front Panel
MR / M key
This key is used to select the MR
(Memory Recall) mode from the VFO
mode or CALL channel 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.
To store data into memory press the F
key and within 10 seconds press the
MR/M key.
MHz / LOCK key
This key is used to tell the
microprocessor that you wish to
increase or decrease the operating
frequency in 1 MHz increments.
Press the F key and then the
MHz/LOCK key within 10 seconds to
lock the dial.
VFO / MPV key
This key is used to return to the VFO mode 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.
Press the F key and then the VFO/M P V key within 10 seconds
to move the memory or call channel data into the VFO.
POWER switch
This switch is used to turn the
power on. The -ON- indicator
appears when the switch is
pressed, then about a second later
the frequency display will appear.
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Release button
Slide this button to the right
to unlock the front panel
from the chassis. There is a
microphone socket on the
right side of the chassis.
Tuning control
This control is used to select the desired
transmit/receive frequency, MHz step,
Memory Channel, Frequency Step, Tone
Frequency, Scan Direction, etc .
12

CONTROL SELECT keys (Press) / Current Operating Band indicators
These
keys
are
used
to
select
the
key
operating
band.(To
change
the
transmission
band,
use
the
BAND
SELECT
key.)
The
green
light
shows
which
band
will
be
controlled
by
the
front
panel
controls.
When optional
band unit is
installed.
SQL = (Squelch)
controls
These controls
are used to
separately adjust
each squelch
threshold level.
has been selected.
VOL controls ( Rotate)
BAND SELECT keys (Press) / VOL controls ( Rotate)
These keys are used to select the transmit band. They are also used to select
the band you wish to control with the front panel switches. When a key is
pressed the "PT T” indicator will flash as a visual signal to show which band
These controls are used to adjust the volume.

CALL key
Press this key to activate the
call channel function.
Pressing the key for longer
than 1 second will initiate
VFO/CALL or MEMO/CALU
scan.
Pressing the F key
momentarily and then
pressing this key will store
the currently displayed data
into the Call channel.
SHIFT key
Pressing this key
will cause the
radio to shift from
one offset
direction to the
other, i.e. “+” to
“—" to simplex
where no
indicator shows.
(“—” to “—” for
European
version)
REV / STEP key
This key is used to reverse the
transmit/receive frequencies
during repeater operations. If
you have selected simplex this
key will not function.
Pressing the F key
momentarily and then
pressing this 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.
LOW / DIM key
This key is used to select
the transmit output
power level.
Pressing the F key
momentarily and then
pressing this key will
allow you to select the
desired display intensity
with the main tuning
control. Four intensity
selections are possible.
TONE / T.ALT key
Pressing this key causes the radio
to select the desired tone signalling
mode(T, CTCSS, OFF).
Pressing the F key momentarily
and then pressing this key will
activate the T.ALT function.
DTSS key
A unique audio tone has been
With Optional DTU-2 ;
or off) .
programmed for each key. The tone
will sound whenever a key is pressed.
Pressing this key selects the desired
tone signaling mode (DTSS, Paging,
14
MUTE / ABC key
This key is used to lower the
receive audio level by —20dB.
Pressing the F key momentarily
and then pressing this key will
toggle the ABC function on or off.

WFunction key Assignments @ Press and hold the F key, then the key below.
® Press the F key for longer than 1 second so that the Ke ancéion Refor'te
key indicator begins to flash, then press the key y
below. F+ VFO Enter the programmable scan| err
lower frequency limit is
Key Function Refer to Enter the programmable scan
Change Scan Hold/ F+ MHz upper frequency limit P38 4-5-4
FiSec,
VFO
P.360
4-5-2
s
7
Resume mode Clear the displayed memory
FiSec,
MR
Memory
channel
lockout
P40
4-5-10
F+
MR
channel
data
Pab
44-8
FisSec,
MHz
Automatic
Power
off
function
bes
ag
F+
TONE
Bank
status
display
P32
4-4-7
: will turn on or off : F+ DTSS DTSS delay time selection P45 4-7-4
Fisec,
CALL
The
lower
limit
of
the
eT
F+
LOW
Memory
consolidation
P.32
4-4-7
programmable VFO F+ fe " pag IME
Rede utomatic Memory scan 3 5:
FiSec, SHIFT The upper limit of the Bisa ad CONT SEL
programmable VFO F+ : fee
Fises; eKiee Nigh ae - BAND SEL Clear Memory Ban P.35 4-4-8
2 equency selection . “O-.
TONE F+ PTT TX Alert P27 4-3-2
FisSec, REV Beep tone level adjustment | P.53 4-12
FiSec,
DTSS
DTSS'coda.eelectton
P44
4-7-2
@
Press
and
hold
the
key
below
and
turn
on
the
power
FilSec, LOW Time-out timer onor off | P.28 4-3-3 switch.
F1Sec Select receive detection Key Function Refer to
x tput band from the 3
CONT SEL ae P18 4-1 MR+
microphone connector Power ON Memory reset of all bands P.29° 4-4-2
F 1Sec, F
+BAND SEL
BAND
SEL
Bani
on
Groff
Bee.
gee
Memory
reset
ofaband
|
P29
4-4-2
+Power ON
15

4-1-2. Microphone
Key Function Refer to
VFO+
Vv! t of all b: P.3 4-4-2
Power ON FO reset of all bands 0
L
VEOH-BAND SEI VFO reset of a band P30 4-4-2
+Power ON
MHz+ ’
Power ON All lock on or off during Lock} p54 4-14
CALL+ Demonstoration mode Po
Power ON on or off bi
F+SHIFT+
T i P.51 4-9
Power ON ‘one alert selection ited
F+TONE+ maa + cache S.A. ang Canada only
Power
ON
et
the
time
and
date
‘
1.
@OQuU
P/DWN
switches
These switches can be used to increase or
decrease the VFO frequency, the Memory
P66 7-3-1 channel number, and the Tone frequency, etc..
@PTT (Push to Talk) switch
With optional DTU-2:
F+DTSS+ The microphone PF key can
Power ON be used to change the beep
tone frequency.
The transceiver will transmit whenever this
F+Low+
Wide
/Narrow
selection
|
P28
4-3-4
switch
is
depressed.
Scan
operations
may
be
Power
ON
canceled
by
pressing
this
switch
without
transmitting.
@LOCK
switch
This key will deactivate all functions of the
microphone except the PTT function and DTMF
keypad.
®©16-Tone DTMF keypad
These buttons are used to activate the DTMF
encoder.
16

©PF(Programmable Function) key
This key can be programmed to perform any of the
following functions: BAND SEL (3) key (Initial setting
from the factory); or MHz, T.ALT, TONE, REV, DTSS,
LOW, MUTE, or CONT SEL (%) key.
To program the key use the following procedure:
1. Turn off the POWER switch on the transceiver.
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.
(x) Press the PF key set in the CONT SEL or BAND
SEL key to cause the radio to switch from a band to
the other. Pressing the PF key for longer than 1
second will not initiate scanning
Press the PF key set in the CONT SEL or BAND
SEL key to cause the radio to switch from one band
to the other. Pressing the PF key for longer than 1
second will not initiate scanning.
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 allow you to
open squelch of the selected band to check the band for a
clear frequency. This will function even if you are
operating in the CTCSS decode 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.
@CALL key VFO key MR key
These keys function are like the CALL, VFO,or MR key
on the front of the radio. (See page 12.and page 14)
These keys can be programmed to function as the PF
key.
To program the key :
1. Turn off the POWER switch on the transceiver.
2. Press and hold one of these keys.
3. Turn on the POWER switch. The PF-2/3/4 will
appear in the display.
4. Press the key on the front panel that you wish to
program the microphone key.
5. Release the microphone key.
To release the programming reset the VFO.
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ie maadtl maaiti Gaaate |
| 288 wommrers FH 288 servers 9 288 reer A
MR key PF2
MR key PF3
MR key PF4
@1750key (European version)
The transceiver will transmitt with 1750 Hz repeater
access tone whenever this switch is depressed.

@ Microphone terminal connection
(Front view)
8C: UP DWN
8VDC 100mA RD: Receive audio for
max. GND the selected TX
band
(100mV/10kQ)
Receive Audio Output Band Selection (RD) connector
The RD terminal will supply an audio signal during
receive on the same band that has been selected for
transmit. Press the F key for longer than 1 second, and
then press the CONT SEL key for the desired band. An
indicator will appear in the frequency display of the
selected band.
Receive Audio output display
The 100 kHz dot in the band lights
18
4-1-3. Display Panel
OGRA Indicates the TX band.
@Q—-—+
Displays
the
selected
transmitter
offset
direction.
@REV
On
when
the
Reverse
function
has
been
activated.
@CTCSS
With
the
optional
CTCSS
unit
TSU-7:
On
when
the
Tone
Decode
function
is
active.
On
when
the
Tone
Encode
function
is
active.
®DTSS With optional DTU-2
On when the DTSS function is active.
®co On when Carrier Operated scan is
selected.
@®
Q
On
when
the
Tone
Alert
function
is
active.

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®,9g88:89s Displays the operating frequency to the
nearest kHz digit, or the tone frequency.
Uf — The indicator flashes when scanning.
On when receive detection output is fixed
in the band.
On whenever the F key has been
depressed.
Shows the last memory channel number
that was selected. The * indicator is on
when the Memory channel will be skipped
during Memory channel scan.
Pg On in paging mode.
On when the squelch opens.
deem
This
level
meter
indicates
the
relative
receiver signal strength or the relative
transmitter power output.
of
® +88
=)
® On during transmit.
@ LM Indicates the relative output power
setting for transmit. No indicator
indicates full power.
3 4usar
SO
® SLEEP
® Lock
A.LOCK
@® APO
@ TOT
® ABC.
@ MUTE
1200MHz band only; On when the Automatic
Lock Tuning function is active.
28/50 MHz band only;On when Attenuator is
on.
On when the TIME ON/OFF function has
been activated.
On when the SLEEP TIMER function has
been activated.
On when the Lock function has been
activated.
On when the All Lock function has been
activated.
On when the Automatic Power Off
function has been activated.
On when the Time-Out Timer function
has been activated.
On when the Automatic Band Change
function has been activated.
On when the volume of the RX band is
reduced.

4-1-4. Rear Panel and Side Case
144MHz
144MHz
TM-741A/741E
TM-741A/741E
440/430MHz
440/430MHz
TM-641A
TM-641A
220MHz
5
220MHz
@ANTENNA
connector
Attach an antenna with a low SWR and impedance of 50
ohms.
@13.8 VDC power input connector
Connect the supplied DC power cable to this connector.
Pay close attention to the polarity. Red is positive and
black is negative.
@Fuse holder
Contains a 15A fuse. Do not use a larger fuse as
damage might result to the transceiver.
@External speaker jack (Rear panel)
The speaker should have an impedance of 8 ohms.
The audio is switched to the external speaker (no sound
is output from the built-in transceiver speaker).
20
Example
144MHz band
TM-741A/741E
{ 440/430MHz band
TM-641A
Do 220MHz
®External speaker jack (Side case)
The speaker should have an impedance of 8 ohms.
The
audio
is
switched
from
the
built-in
transceiver
speaker
to
the
external
speaker
(no
sound
is
output
from
the
built-in
transceiver
speaker).
Example
Orr ¥ 144MHz band
Ss e. a
| TM-741A/741E
440/430MHz band
< TM-641A
3 “| “220MHz
We
recommend
the
use
of
the
optional
external
speaker
SP-50B.