Kenwood TM-241A User manual

COO/AN3»
144MHz
FM
TRANSCEIVER
TM-241A/241E
430/440MHz
FM
TRANSCEIVER
TM-441A/441E
1200MHz
FM
TRANSCEIVER
TM-S41A/S41E
(
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 |
ІНІ power mode might cause the rear of this |
i
i transceiver to get warm.
Do
not
place
the
transceiver
where
the
heat
sink
(rear
panel)
might
come
in
contact
with
plastic
ог
vinyl
surfaces.
This
instruction
Manual
covers
the
following
models.
TM-241A: 144MHz FM TRANSCEIVER
(U.S.A. and general markets)
TM-241E: 144MHz FM TRANSCEIVER
(U.K. and European markets)
ТМ-441А:
440MHz
FM
TRANSCEIVER
(U.S.A.
only)
TM-441A:
430MHz
FM
TRANSCEIVER
(General
markets)
ТМ-441Е:
430MHz
FM
TRANSCEIVER
(U.K.
and
European
markets)
ТМ-541А:
1200MHz
FM
TRANSCEIVER
(U.S.A.
only)
TM-541E:
1200MHz
FM
TRANSCEIVER
(European markets)
NOTE:
lf 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
expressly
approved
іп
the
modifications — are
instruction manual. The user could lose the authority
to operate this equipment if an unauthorized change
or modification is made.

CONTENTS
1.
gr de а.
BEFORE OPERATION ......... sac ts ње 4
SPECIFICATIONS уснаа NE RS 6
ACCESSORIES аа istbeses 7
INSTALLATION INSTRUCTIONS ...... 7
OPERATION
CONTROL ЕЏМСТОК5.................. 10
RECEIVER OPERATION
Reception ............... ——— 16
Frequency Selection ................... 17
Frequency Step Selection .............. 17
Programmable VFO Tuning Limits ...... 18
АіТ(ТМ-541А/Е опіу).................. 19
TRANSMITTER OPERATION ............. 20
Time-out Timer (TOT) ................. 20
MEMORY
Microprocessor Memory back-up ....... 21
Initial State acc. аз VR En ES qa utat ud 21
Microprocessor Initialization ........... 21
Memory Channel ..................... 21
Memory Contents «coss EXER 22
Memory Entry: соқалар eei di ovs 22
Memory Channel Recall ............... 24
Memory Sit: о ou за ier E s 24
SCAN
Scan Operation сеанса ues а Sa 25
6.
7.
Hold/Resume Programming ........... 25
Band Scam. oos terza daten Е ло 26
Programmable Band Scan ............. 26
Memory Channel Scan ................ 27
Memory Channel Lockout ............. 27
Priority Alert Function ................ 28
REPEATER OPERATIONS
Transmitter Offsets ................... 28
Reverse Function ..................... 29
Ттопе:Ореѓапоп:. “асьохтаедфь жееытжа 29
Tone Frequency Selection ............. 29
Autopatch (U.S.A. version only) ........ 30
TONE / CTCSS OPERATION.......... 30
DTSS (Dual Tone Squelch System)
OPERATION зена RR 31
DRS (Digital Recording System)
OPERATION: „о RE RR des 34
PAGING): аон оо ован EV 41
TONE ALERT SYSTEM ............... 47
APO (Automatic Power Off) ............ 48
DIMCUimmab). оа ба xe eet cater danse 48
ВЕЕР essai  49
LOCK/A.LOOK ....................... 49
BLOCK DIAGRAM and
SCHEMATIC DIAGRAM Another sheet
MAINTENANCE ..................... 50
IN CASE OF DIFFICULTY ........... 51
8.
OPTIONAL
ACCESSORIES
...........
52

A WARRING); BEFORE OPERATION
TO PREVENT ELECTRIC SHOCK, FIRE AND OTHER
INJURY. 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 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
ри!
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.

Output (5% distortion)
2 SPECIFICATIONS
ТМ-241А/Е | TM-441Ausaicanaca ТМ-441Е
| Frequency range MHz 430 to 440 | 1240 to 1300
мовам
|
Antenna
impedance
са
аашаа
E
Operating temperature
© | Power requirements
- Ground Negative .
gramen Less than ТОА
Less than 0.6A
Frequency stability Less than +10ppm
Dimensions (WXH XD) (mm) (Projections included) 140 x40 X 160(5-1/2" х1-37/64”х6-19/64”) (140X40X172(51/2"x 1-37/64" X 6-25/32")
Weight (kg)
Hl 50W
Output power 2 MID Approx OW — | aoiw CdS
5 LOW Approx. 5W
E
с Spurious radiation Less than — 60 dB
Е
Audio distortion (at 60% modulation) Less than 3% (300 to 3000 Hz)
Intermediate frequency lst/2nd | 30.825MHz/455kHz
@ | Selectivity —6dB: More than 12 kHz 6008 Less than 24 kHz
d
More than 2 W across 8 Q loads
External speaker impedance
> С 0) = m m — A EN
6
-— ы
со
80
2 Recommended duty cycle: 1 minute Transmit, 3 minutes Reception
Circuits and ratings are subject to change without notice due to advancement in technology.

3 ACCESSORIES
Unpack your new transceiver carefully, and examine it
for visible damage If the equipment has been
damaged іп 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 оган
Screw set ..............
Self tapping Screw
(U.S.A. CANADA LL
Hex wrench: оаа saad
Stacking plate
(TM-441A/441E/541A/541E)..
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.
N46-3010-46 2 ea.
W01-0414-04 1 ea.
J21-4147-14 2 ea.
DC power Cable ............. E30-2111-05 1 ea.
Fuse (TM-241A/241E: 15A).. ҒО5-1531-05 1 ea.
(TM-441A/441E: 10A).. FO5-1031-05 1 ea.
(TM-541A/5A1E: 8A)... FO5-8021-05 1 ea.
Instruction Manual ........... В62-0031-ХХ 1 copy
Waranty Card rorot жаа EE Fx MS l ea.
(U.S.A., CANADA , EUROPE market s only)
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
when connecting to the battery.
Engine аша ыт сты Passenger compartment
Fuse
R
Select a location whare E
the power cable is pro- l
! tected from heat, mois-
| ture or abrasion when `
, Securing ће the cabe. ,
Red
9
\ To the
\ transceiver
Make sure the cable does
not directly contact the
edge of the hole by using
a grommet.
cable
Chassis
or
ee
PENES,
fire
wall
Battery
W |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).

4-2-2 Fixed Station
A regulated DC power supply (13.8 VDC capable of
supplying at least 11 amperes) is required. PS-33 is
recommended.
outlet until 81 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)
4-2-3 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
lightening
arrestor
in
your
antenna
lines
for
protection
against
fire,electric
_
shock,personal
injury,or damage to the radio itself.
<<
M
Àဗ—Á
——
—
A

5 OPERATION
5-1-1 CONTROL FUNCTIONS
(22 POWER switch
Press to turn the transceiver on or off.
Press the VFO/MPV 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.
@ Tuning control
This control is used to select the desired
transmitter /receiver frequency, MHz step, memory
channel, frequency step, tone frequency, scan
direction, etc.
(3 VOL 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.
@ SQL (Squelch) control
This control is used to select the desired squelch
threshold level.
10
ALOCK ~ ~ FEV >
99606885588
AL CTCSS g i
Ка Б
5) LOW/DIM key
LOW
This function is used to select the transmit output
power level (НЕ, 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. |
(6) Microphone connector
Attach the supplied microphone to this connector.
Тһе pin out of the connector is shown in the
accompanying illustration.
%
GND
T
GNO
{Microphone
audio)
$ MIC
(Microphone Audio) (3) RX Audio Output
2 PTT (Approx 100 mV/10 к ohm)
(Push to Talk)
3: DWN
@ UP
5) В VOC (Max 150 mA)