Kenwood TM-401A User manual

KENWOOD TM-401A
INSTRUCTION MANUAL
Illustrated is the USA version.
You are the owner of our latest product, the new TM-401A
transceiver. Please read this instruction manual carefully
before placing your transceiver in service. The unit has been
carefully engineered and manufactured to rigid quality stan-
dards, and should give you satisfactory and dependable
-~ operation for many years.
CONTENTS:
1. FEATURES. talc cinta aaltitataios Poswatiaeopaehasans tetas sary 3
2. CONTROLS AND THEIR FUNCTIONS .......... 4
3. INSTALLATIONS AND CONNECTIONS ...........00002.. uv 2
A I RERAT OIM 16, axences cums esha aie deobenicterstiw inlsholint 13
5. MAINTENANCE AND ADJUSTMENT.............000.005 vw VB
6. ABISESSORIES . snus suc sinse-tcesnndsve sense eneememetber wean VO
7. BLOCK DIAGRAM ....... nsiecinay ciara joe gee ae a 22,23
8. SPECIFICATIONS........ Sra Shinto tea Bins 23,24

@ ACCESSORIES
®
For versions other
than USA.
~ KENWOOD
For USA version.
Carefully unpack your TM-401A and check that it is
supplied with the following accessories:
@ Microphone
a Dynamic microphone ..................0..0cc0ccceeeeeees (
b Electret condenser microphone with touch-tone...(
@ Communications speaker (with 2.5 mlead) ......... (
@) Speaker mounting kit
Brack6tceauncususengn
Cushion (A)
Tapping screw ($4 x 8)
Flat head tapping screw ($4 x 8)
Round head screw (@4 x 10) ....
Hex. head nut (4)
Mobile mounting kit
Mounting bracket.......
Boss
Flat washer for boss (3) ....
Flat screw for boss (@3 x 14)
Round head screw (@6 x 20)
Flat washer (@6)
Spring washer ($6)
Flange nut ($6)
Tapping screw ($5 x 12) ....
Flat washer ($5) (
Cushion (B) .5.snisssc.-s. ie seadprareanneprowesre stall
Cushion (C) .. ee rrre ade
Stack plates.............. (
Bind screws............... (
DC power cord (Approx. 2 m)....
Spare fuse (5A) ctr acne Seka asad (
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T91-0331-05)....1 ~ |
T91-0332-05)....1 pc.
T19-0101-05)....1 pe.
J21-2799-13)....1 pe.
3-0680-04) ...1 pc.
N87-4008-41) ..4 pcs
N88-4008-41) ..2 pes
N30-4010-41)..2 pes
N10-2040-41) ..2 pes
A13-0640-12) ...1 pc.
J32-0775-04) ..4 pes.
N19-0631-05) ..4 pes.
N32-3014-41) ..4 pes.
NO9-0008-04) ..4 pcs.
N15-1060-46) ..4 pcs.
N16-0060-46) ..4 pes.
N14-0510-04) ..4 pes.
. (NOS8-0632-05) ..4 pcs.
N15-1050-46) ..4 pes.
G13-0683-04) ...1 pc.
G13-0686-04) ..2 pcs
J21-2800-04) ..2 pes
N35-3006-45) ..4 pcs.
_.(E30-1689-15)....1 po)
FO5-5022-05)....1 pc.
B50-4060-00) .. 1 copy
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@ AFTER UNPACKING
Shipping container:
Save the boxes and packing in
remote operation, maintenance, or service.
The following explicit definitions apply in this manual:
Note:
personal injury.
Caution:
he event your unit needs to be transported for
If disregarded, inconvenience only, no risk of equipment damage ame
Equipment damage may occur, but not personal injury.

1. FEATURES
¢ Compact, slim transceiver for
easy mobility
-_-~
¢ Microcomputer provides
multi-frequency control
functions
© Dual function keyboard
facilitates memory recall (MR)
© High reliability by using PC
boards for each unit; high
sensitivity (12 dB SINAD
0.2 »V) front-end using
GaAs FETs
© Quality sound for transmission
and reception
-. HI/LOW switch controls output
power
¢ Repeater operation
NOORWN—
. Coaxial connector with cable greatly reduces effective depth when connec-
ting an antenna cable.
. External speaker system allows installation in any place.
. Remote frequency control unit (FC-10) extends your operation facility.
. Five channel memories plus COM* channel can be recalled at will.
. ALERT function monitors memory channel 1 (M1).
. Memory scan operation (MS) from memory channels 1 through 5.
. Programmable scan within the frequency range selectable.
. 1 MHz step-up function (MHz).
. VFO A in 25 kHz steps; VFO B in 25 kHz steps.
. Beeper indicates each of 7 modes.
POWER/VOL SQUELCH
. External communications speaker, 77 mm in dia., supplied.
. Maximum 3% modulation distortion ensures good quality transmit signal.
.
COM*
system
facilitates
access
to
repeaters
with
the
TU-3*
unit
(option)
in-
stalled.
. The TU-3 2nd tone frequency (one of 37 frequencies selectable) intercon-
nected with the TX OFFSET system enables access to a repeater.
. The REV switch monitors direct signal.
* European and British versions excluded.

2. CONTROLS AND THEIR FUNCTIONS
Note: Illustrated is a version other than that of Europe/England.
8 eo @o
ow
POWER/VOL SQUELCH
0
@ FRONT PANEL
@ Tuning control (VFO) Used to set frequency for transmission and reception. One step (depending
upon VFO step) per one click shifts up and down. During memory recall opera-
tion, turning this control restores the operation to VFO with the frequency
displayed. x
Note: One click rotation shifts the displayed frequency one step up or
down. However, the frequency step may not be changed due to microcom-
puter transient.
@ POWER/VOL Power ON-OFF switch and volume control are combined. Turning the control
fully counterclockwise will turn the power OFF. Clockwise rotation will in-
C) creases the volume.
oF
© SQUELCH The squelch control is used to eliminate noise during no-signal time. Normally,
this control is adjusted clockwise until the noise disappears. For scan opera-
© tion, this control must be set to the threshold point.
@ Keyboard
a) MR/M1 (memory recall) Used to recall memory channe!.
key When depressed, memory channel 1 is recalled. The MR indicator lights to
show the memory recall is in operation.
Cr
Ee
When
recalling
one
of
the
memories
in
M2~M5,
depress
the
MR/M1
key
=a | then the corresponding key of M2 ~ M5.
b) MS/M2 (memory scan) Used to initiate scan for memory channels. _
key During memory recall operation, depressing this key recalls memory CH2. ~
Cus a During memory scan, depressing this key recalls the next memory channels.
C4

~
-_~
-_
(©) MHz/M3 (1 MHz up) key
M3
‘d) M/M4 (memory input)
key
Cm
4
‘e&) AL/MBS (alert) key
re v5 |
Eas]
f) A/B (VFO AJB selection,
scan stop) key
A/B
CI
© MIC connector (8 pin)
@ COM (common channel) key
For users other than Europe and England.
COM
E4
TONE switch (For British version)
TONE
When depressed, the displayed frequency shifts up 1 MHz. During memory
recall operation, depressing this key recalls memory CH3.
Used to store the desired frequency in memory channel (and in COM channel:
European and British versions excluded).
For memory input, refer to page 15.
During memory recall operation, depressing this key recalls memory CH4.
In memory CH4, transmit and receive frequencies are stored independently for
odd split operation.
When depressed, the ALERT indicator lights to show alert operation is in pro-
gress.
Depressing this key again releases this operation. For more details, refer to
page 17.
During
memory
recall
operation,
depressing
this
key
recalls
memory
CH5.
Memory
channel
5
is
used
for
odd
split
operation
as
for
memory
channel
4.
The
frequencies
(transmit
and
receive)
stored
in
CH5
designate
frequency
range
limits
for
programmable
scan
operation.
For more details, refer to page 15.
As shown in the table, this key provides three types of operation.
Mode A/B key functions
VFO Each time the key is depressed, VFO A and B are selected
alternately.
MR When depressed, VFO before memory recalled is restored.
SCAN When depressed, scan is released.
Microphone audio input. Frequency UP/DWN control and PTT lines are includ-
ed. Pin assignments of the MIC connector are shown below.
@©+8V
(10 mA Load)
@ STEven Note: Do not apply voltage to
omic pins@, @, and @.
®
GND
The
pin
should
not
be
shorted nor applied any
FRONT VIEW voltage.
When the key is depressed, the common channel can be recalled any time.
This channel can be changed to your desired frequency. For common channel
replacement, refer to page 15. To release common channel operation,
depress this key. No other key can release the operation.
When the optional TU-3 tone unit is installed, the 1st tone frequency is emitted
when operating the COM channel.
When
this
switch
is
pressed,
the
repeater
control
tone
burst
signal
(1,750
Hz)
is
emitted
for
about
0.5
seconds
at
the
beginning
of
each
transmission.
TONE switch (For European version) When this switch is pressed, the repeater control tone signal (1,750 Hz) cir-
TONE
cuit is activated and the unit is set in the.transmit mode.

@ HI/LOW switch
@ Display
(h)
Frequency display
Scan indicator
VFO B indicator
MR indicator
ALERT indicator
ON AIR indicator
BUSY indicator
S & RF meter
Note: Illustrated is a version other than that of Europe/England.
9 C6)
HI setting: This setting allows the transmitter to transmit power output up to 12
watts.
LOW setting: This setting allows the transmitter to transmit power output
approx. 1 watts.
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Lieb ea bt BUSY — LA
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During VFO A or B, frequency, for example, 435.025 (445.025 for USA) is
displayed in four digits as ‘’ 5.025 "’.
During MR (M1 —Mb5) operation, frequency, for example, 435.250
(445.250 for USA) is displayed in four digits as ‘5.250’.
During COM* operation, frequency is displayed in four digits. At this time, zero
at the last digit is half size.
* European and British versions excluded
During scan operation, this dot flashes.
In operation other than scan, this dot lights to show MHz.
Lights when VFO B is in operation
Lights during memory recall operation (M1 — M65, MS).
Lights during alert operation.
Lights when transmitting.
Lights during reception with squelch opened.
This can be used to see if the channel is busy or not. «~
Indicates the incoming signal strength by LEDs during reception.
During transmission, LEDs light to show the RF output level strength.
With the HI/LOW switch HI, all LEDs light.
With the HI/LOW switch LOW, two to four LEDs light.

© REV switch
REV
O
@ TX OFFSET switch
TX
OFFSET + -
Area
—1.6 MHz }—7.6 MHz
Europe
(D-A) (D-B)
England | +1.6 MHz|—1.6 MHz
Used
to
reverse
the
repeater
shift
to
monitor
a
signal
coming
to
a
repeater.
Set-
ting
this
switch
to
ON
in
simplex
operation
locks
the
displayed
frequency
regardless
of
VFO,
keyboard,
and
COM*.CH
operations.
(*
European
and
British
versions
excluded.)
Used
to
set
transmit
frequency
shifted
from
the
displayed
receive
frequency
when
transmitting.
For
operation
other
than
that
of
a
repeater,
place
this
switch
to
the
'’S’’
posi-
tion.
This
equalizes
the
transmit
frequency
with
the
receive
frequency.
*(""+""
setting
shifts
+5
MHz;
‘’—‘’
setting
shifts
—5
MHz
from
the
receive
frequency
when
transmitting.)-For
European
and
British
versions,
refer
to
the
table
at
the
left.
This
operation
is
only
effective
in
VFO
and
MR
(M1~M3)
operations.
If
a
shift
frequency
goes
beyond
the
operating
frequency
range
when
depress-
ing
the
PTT
switch
to
transmit,
a
beep
will
sound
three
times
to
indicate
the
misoperation.
However,
transmit
frequency
is
emitted
in
simplex
mode.
*With
the
optional
TU-3
tone
unit
installed,
either
‘‘+’'
or
‘'—"’
setting
of
the
TX
OFFSET
switch
interconnects
the
TU-3
2nd
tone
frequency
setting.
(*
European
and
British
versions
excluded.)
@ REAR PANEL
@ ANT connector lead
@ DC Power Terminal
® SP Terminal
@ RIGHT SIDE PANEL
Connect a 50-ohm antenna to this terminal.
DC
power
input
terminal.
Connect
the
supplied
power
cord
with
plug.
Input
voltage is 13.8 V DC.
Observe plus (+) and minus (—) polarity!
Connect the supplied 8 ohm speaker to this jack.
® Remote jack
Used
to
connect
the
optional
FC-10
unit,
controlling
the
operation
frequency.
7

i MICROPHONE (For U.S.A. version)
@® UP/DWN switches
@® PTT Switch
@ 16 Touch-Tone Keys (Auto-
patch operation)
H@ MICROPHONE (For versions other than U.S.A.)
@® UP/DWN switches
@® PTT switch
1)
2)
3)
Mic-hook button
~ KENWOOD
Microphone
Touch-tone
encoder
Depressing
the
UP
or
DWN
key
momentarily
shifts
the
displayed
frequency
one
step
up
or
down.
Holding
the
key
depressed
continuously
shifts
the
frequency
up
or
down.
Holding
the
UP
or
DWN
key
depressed
for
about
one
second
initiates
scan
operation.
The
scan
direction
depends
on the
UP
or
DWN
key
operated.
Depressing
the
UP
or
DWN
key
during
MR
operation
will
change
the
opera-
tion
from
MR
to
VFO.
Press-to-talk
switch
is
used
for
transmission.
This
will
also
releases
scan
opera-
tion.
When
releasing
the
SCAN
operation,
transmission
is
inhibited.
Used to activate the touch-tone encoder.
1)
2)
3)
Depressing the UP or DWN key momentarily shifts the displayed frequency
one step up or down.
Holding the key depressed continuously shifts the frequency up or down.
Holding the UP or DWN key depressed for about one second initiates scan
operation. The scan direction depends on the UP or DWN key operated.
Depressing the UP or DWN key during MR operation will change the opera-
tion from MR to VFO.
Press-to-talk switch used for transmission. This will also release scan opera-
tion. When releasing the scan operation, transmission is inhibited.

3. INSTALLATIONS AND CONNECTIONS
B@ ANTENNA
The performance of the transceiver depends upon the type of antenna to be us-
ed. To ensure the maximum performance of the TM-401A, select a suitable
™m~ antenna and adjust it for low VSWR.
@ MOBILE INSTALLATION
® Interconnection The TM-401A is equipped with a speaker.
DOT
Sill
>) | ||
To 70 cm band antenna
> Black
©
Installation
location
Using
the
supplied
mounting
bracket,
install
the
transceiver
under
the
dashboard
or
on
the
side
of
the
console
in
your
car
as
shown.
If
your
car
is
equipped
with
an
electronic
fuel
injector,
the
transceiver
should
be
as
far
from
the
control
equipment
as
possible.
Under driver's seat ! I
; \
Side of —-t | Console
console 1
i 7 | eee Under side of The transceiver should be
dashboard located from your knees.
H COMMUNICATIONS SPEAKER INSTALLATION
Note: To keep driving safe, do not install the speaker to the ceiling.
Example 2-2
Nut (to $4)
rat a
Mounting Mounting
surface surface
Tapping screw oo fe) © o| Round head
(¢4x 8) screw
(¢4x 10)
Tapping screw
(¢4 x 8)
Cushion (A) i

Example Bw
LLL
Bracket
®
Installation
procedure
1)
Secure
the
bosses
on
each
side
with
4
flat
head
screws.
(Fig.
a)
2)
Affix
the
cushion
(c)
on
each
side
of
the
mounting
bracket.
(Fig.
b)
3)
Secure
the
mounting
bracket
to
a
car
chassis
as
shown
in
Fig.
c.
When
installing
the
bracket,
be
sure
the
front
part
of
the
bracket
faces
you.
4)
Insert
the
transceiver
as
shown
in
Fig.
d
so
the
bosses
on
the
transceiver
slide into the grooves of the mounting bracket.
5)
To
stack
with
the
TM-201A
(2
m),
first
secure
the
supplied
stack
plate
to
the
TM-401A
with
bosses
then
stack
the
TM-201A,
second
insert
the
stacked
transceivers
as
shown
in
Fig.d
so
the
bosses
on
the
upper
transceiver
slide
into
the
grooves
of
the
mounting
bracket.
Flat head Boss Flat
screw washer
Be sure to use flat washers. Otherwise, in-
stallation to the mounting bracket is not done
well. However, when stack installation with
the TM-201A is attempted, do not use these
washers since the stack plates are used.
Fig. c Mounting bracket installation
Mountin,
:
surface
i
Piange
nut
Mounting
surface
\
ae
\_
Bi
\) Flat washer
\\ Spring washer
* Hex. head bolt
To install the bracket on a
bent mounting surface, bend
these parts as shown.
10
\\ Flat washer
Tapping screw
Mounting bracket
Mounting surface
Rear part of the
Fig. b Cushion attachment
Affix the cushion (C)
on each side.
Fig. d Transceiver installation
Transceiver installation
Ensure the front/rear of the bracket
when mounting.
Fess
Flat
screw
Stacking
plate
Affix the cushion (B).
TM-201A
TM-401A