Kenwood TH-225A User manual

dp On
144MHz FM TRANSCEIVER
TH-225A
INSTRUCTION MANUAL
KENWOOD CORPORATION
©PRINTED IN JAPAN B50-8334- oat P)(T)
90/12 1110987654321 89/21

Thank you for purchasing this new transceiver.
IMPORTANT
Please read this instruction manual carefully before placing
your transceiver in service.
SAVE THIS INSTRUCTION MANUAL.
Under normal circumstances, the transceiver will operate
in accordance with these operating instructions. The tran-
sceiver was preset at the factory and should only be read-
justed by a qualified technician with proper test equipment.
Attempting service or alignment without factory authoriza-
tion can void the transceiver’s warranty.
CAUTION: —
Long transmission or extended operation in the 6 watt 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.
Use of an external antenna for fixed station is recommended.
FCC WARNING:
This equipment may generate or use radio frequency ener-
gy. Changes or modifications to this equipment may cause
harmful interference unless the modifications are express-
ly approved in the instruction manual. The user could lose
the authority to operate this equipment if an unauthorized
change or modification is made.
CONTENTS
ACCESSORIES
SPECIFICATIONS .
BATTERY PACK...
Ni-Cd battery
Recharging the battery pack
Manganese/Alkaline batteries
Operating time
CONTROLS AND FUNCTIONS
OPERATION
Receive
Transmit
Frequency selection...2....:cccecseseseeisacse esses 11
R&EPBator: OPEFAtiON :cceis<ssacdesencossecidcenedeoareaurses et 12
Transmitter offsets
Reverse function
Tone operation
Auto patch operations ...
MMQMOLY: :. 226 600sesace cs sdveanimersavedeccuaisaiaasazapeRiiaseacton 15
Memory channels
Memory entry
Memory recall
Odd Split memory channel.
Memory channel lockout ............:eccceeeeeeeeeeee 16
Clearing a specific memory channel
Clearing all memories
Memory back-up battery
Priority alert channel check
Batty SOVGIS. fi5i5 00005055 vend savenveesanssyucds onan 17

MAINTEMANGE s:;..20c:00ccccensecessccsidavannsvenssdcenmenscsees 18
In case of difficulty
Service
OPTIONAL ACCESSORIEG. .............0cccceeeseeeeenteeeeeeenee 19
“Programmable tone decoder unit TSU-4
BLOCK DIAGRAM another sheet
SCHEMATIC DIAGRAM another sheet
ACCESSORIES
Unpack your transceiver carefully and confirm that it is sup-
plied with the following accessories.
1 Antenna for 144 MHz
2 Rubber cap
3 Belt Hook.........
4 Machine Screw
5
6
Spring washer .. ...N16-0030-41
Ni-Cd Battery pack
(BBP 2) at aeeae~sh oon a5 saises6 WO9-0541-05..........
7 Battery charger (120 V)..WO9-0517-05..
8 DC cable (PG-2V)... ..-E30-2078-25
9 Instruction Manual . .-B50-8334-XX
O Warranty Card.....

SPECIFICATIONS
FREQUENCY RANGE (MHz)
144.000 ~ 147.995
MODE
F3E
(FM)
OPERATING
TEMPERATURE
=
20°C
~
+50°C
ANTENNA
IMPEDANCE
5029
POWER REQUIREMENT
BATTERY PACK
6.3 V~15 VDC (12 VDC nominal)
z
DC
IN
7.2
V~16
VDC
(13.8
VDC
nominal)
&
is
Hi
TRANSMIT
MODE
6
W
(13.8
V)
Less
than
1.9A
&
&
=
[Low
TRANSMIT
MODE
0.5
W
(13.8
V)
Less
than
0.7
A
=
c
RECEIVE
MODE
WITH
NO
SIGNAL
Approx.
50
mA
2
BATTERY
SAVER
MODE
(At
1
:
9)
Approx.
11
mA
DIMENSIONS
WxHxD
67x
190
37
(mm)
(PROJECTIONS
INCLUDED)
70x
198
x
40
(mm)
WEIGHT
With
Ni-Cd
battery
and
antenna
Approx.
600
g
OUTPUT
POWER
Hi
13.8
VDC
6W
2
With
PB-1,
with
PB-12
5W
ys
With PB-2
2.5
W
E
With
PB-3,
PB-4
1.5
W
FA
Low
0.5
W
z
MODULATION
REACTANCE
F
|
MAXIMUM
FREQUENCY
DEVIATION
+5
kHz
SPURIOUS
RADIATION
Less
than
—60
dB
CIRCUITRY
DOUBLE
CONVERSION
SUPERHETERODYNE
INTERMEDIATE
FREQUENCY
1st
IF
16.3
MHz
a
2nd
IF
455
kHz
2
|_SENSITIVITY
12
dB
SINAD
Less
than
0.2
nV
8
SQUELCH
SENSITIVITY
Less
than
0.1
nV
©
|
SELECTIVITY
-—6
dB
More
than
12
kHz
—40
dB
Less
than
24
kHz
AUDIO OUTPUT POWER (across 8 2 load 10% distortion)
More than 500 mw
NOTE:
Circuit
and
ratings
are
subject
to
change
without
notice,
due
to
development
in
technology.

BATTERY PACK
Installing the battery pack
Match the concave part at the
bottom of the radio to the
convex part at the top of the ~
battery pack.
Turn the battery pack clock-
wise until it clicks.
Be sure the pack and trans-
ceiver are locked together.
Removing Battery pack
Pressing the battery release
button, turn the battery pack
counterclockwise.
Ni-Cd BATTERY PACK (PB-12)
NOTE:
This battery pack has not been charged at the factory in order to
provide you with the greatest number of charge/discharge cycles.
You must charge the battery before use. The battery pack will re-
quire several charge/discharge cycles before you can expect to see
the maximum operating period between charges. If the battery will
be stored for greater than 2 months it should be recharged before
use.
RECHARGING THE BATTERY PACK
Insert the charge plug from the supplied Battery Charger into
the receptacle on the rear of the battery pack. Then plug the
Charger into the AC line. The LED on the Charger will illuminate
to show that the pack is charging. The LED will remain on
as long as the Charger is connected to the AC power source
and the battery, indicating that the pack is still being charged.
Do not allow the battery to charge for greater than 15 hours.
The useful life and battery performance will be reduced if you
exceed the recommended charge period.
NOTES:
© Turn off the power switch before charging.
@ Recharging should be done within an ambient temperature bet-
ween 10°C ~ 40°C (50°F ~ 104°F). Recharging performed out
of this range may not fully charge the battery.
MANGANESE or ALKALINE BATTERIES
Load 6 x R6 (AA) manganese or
alkaline batteries in series in the sup- Stopper
plied battery case. (Be sure to ob-
serve the polarities.)
(We recommend use of high-
perfomance manganese batteries.)
Battery pack (1) can be inserted in-
to the case (2) only in a specific
direction. Check the shape (top and
bottom) after moving the stopper on
the rear side, then insert the battery q
correctly. Inserting the battery by Battery pack (1)
force without checking the shape
may damage the case.
OPERATING TIME
Batt voltage Transmitting.
7) Receiving .
Ag AF OUTPUT
“Battery voltage is measured at transmis-
sion (Hi).
Case (2)
Ni-Cd battery
L2ZV 500mAn\ ~12V B00mAh (PB-1)
(PB-12)
(Manganese
battery Low
'~ Power)
iH 5G battery 8.4y
Ni-Cd battery 7.2V
1600mAh (PB-4)
Ni-Cd battery 7.2V | |800mAh
6 1(PB-3)
Seu a ne ee are
fan,
PU=NGE9 batiary Lower imit voltage range for transmission
30 60 90 720°" 240. 270
(minutes)
Manganese battery (except Alkaline manganese battery) is
suitable only for LOW power transmission.
Recharge the Ni-Cd battery pack when the BATT indicator
comes on.
We recommend use of the PB-3 or PB-4 Ni-Cd battery pack
for long transmission or extended operation.

CONTROLS AND FUNCTIONS
@ Antenna connector
This jack is used to connect the supplied antenna.
Twist to lock with the BNC connector.
@ DC IN terminal
This terminal is used for an external power supply. Input
voltage is 13.8 VDC nominal. The center is the (+) side and
the sleeve is (—) side.
You should turn the power switch OFF when connecting
this terminal. Pay attention to the polarity.
@~)-O CAUTION: —————_________
As a precaution, do not remove the bat-
£ E tery pack when an external power sup-
Bo ply is used. Use the KENWOOD PG-2V
$2 or PG-3E optional cable for the con-
Teo) ss nection.
9.5 mm
@ MIC jack
This jack is used for connection of an external microphone.
The use of an electret type microphone is recommended.
Input impedance is 2 kQ and the DC voltage on this terminal
is 4V.
@ SP jack
This jack is used for an earphone or external speaker. The
recommended impedance is 8 2 nominal.
® TONE switch
This switch is used to activate the sub-audible tone encoder.
© HI(# )/LOW ( . )switch
This switch is used to select the transmit output power.
@ SQL control
The SQL control is used to eliminate noise during no signal
periods. Normally, this control is adjusted clockwise until
the noise just disappears and the BUSY indicator goes OFF
(Threshold level). For scan operation, this control must be
set to the threshold point. When an incoming signal is weak
or unstable, readjust the squelch for optimum reception.
For tone squelch operation with TSU-4, this control must
be set to the T.SQ position.
@) VOL control
Volume control with power ON/OFF switch.

@) MONITOR switch
Pressing this key will open squelch.
PTT (Push To Talk) switch
For transmission, press this switch and speak into the
microphone.
@) RELEASE button
Used to release the battery.
Depress this button, and turn the battery counterclockwise.
(2 LAMP key
This key controls the lamp on the LCD display.
NOTE:
When the LAMP is on battery drain will be accelerated. Do not use
this feature unnecessarily.
@® OFFSET/F key
The OFFSET/F key is used to select the desired transmitter
offset for repeater operation. Each time the key is pressed,
the mode cycles from + shift, to — shift, to simplex, and
back to + shift. When the offset function is ON, the sym-
bol ‘’+’ or ‘‘—"' is displayed.
Pressing the [E_] and the OFFSET/F key in order is used to
change the desired offset frequency.
R/TONE. F key
This key is used to reverse the transmit/receive frequencies
during repeater operation.
TONE. F: TONE FREQUENCY key
Pressing the [_] and the R/TONE. F key in order is used
to change the frequency of the tone encoder.
() SAVE key
The SAVE key is used to select the power save condition
during the receive mode.
Pressing the [L_] and the SAVE key in order is used to
change the battery saver on/off ratio.
SPEAKER
@ MICROPHONE
BATTERY CASE

@ Display
GOB ®
BAND
SEEK
@ FREQUENCY display
@ |[PRIO}
@ (uTo) Save
: Displays the operating frequency.
: ON when the Priority Alert function is
active.
Flashes when the channel is busy.
: Displays the selected power save con-
dition;
(AUTO/, SAVE] for auto save mode,
SAVE] for save mode, and no indicator
for OFF.
: ON whenever the squelch opens dur-
ing receive.
: ON all the time if the squelch control
is rotated counterclockwise, and the
T.SQ is off.
: ON during transmit mode.
@-+
@R
@M
JD |MEMO| PROG
SEEK! TIME| CAR
(Oe Key Lock]
:
Used
to
indicate
the
relative
receive
signal strength, or as an indication of
transmitting.
:
Indicates
the
selected
frequency
step.
:
Indicates
the
selected
memory
channel
number.
:
Indicates
for
approx.
5
seconds
after
pressing the [E_] key.
:
Displays
the
selected
offset,
minus
or
plus,
and
no
indicator
for
simplex.
:
On
whenever
the
REVERSE
function
is
active.
:
Indicates
for
approx.
5
seconds
after
pressing the [4] key.
:
Indicates
the
selected
scan
mode.
Indicates
the
selected
scan
stop
mode.
Flashes
during
scan.
:
Indicates
that
the
transmitter
has
been
disabled by the TX.STOP key.
:
Indicates
that
all
keyboard
functions
except
LAMP
key
has
been
disabled
by
the
KEY
LOCK
is
activated.
:
ON
when
the
battery
voltage
falls
be-
low
the
level
for
good
communications.
Recharge/replace
the
battery
pack.

@ DOUBLE ROLE KEYS
PRIORITY BEEP. STEP
all yy LCA pg ee
. BAND MEMORY PROGRAM
ce)
CARRIER
These 13 keys except the E]) and keys, have two
functions.
The 1st function is printed on the key.
The 2nd function is printed above the key.
All these 2nd functions are active for approx. 5 seconds af-
ter pressing the key.
@ Numeric keys: ~-E,f
These keys are used to select the desired operating fre-
quency and/or memory channel number.
Memory channel 1, 8, and 9 also serve additional functions
as discribed below.
M. channel 1 is used to store the Priority Alert channel in-
formation.
M. channel 8 is used to store the lower, and M. channel 9
the upper limit frequency for the programmable band scan.
© UP/DOWN keys: 1, EJ
These keys are used to increase or decrease the operating
frequency, offset frequency, tone frequency, or the power
saver circuit rate.
@ F: Function exchange key
The [] key is used to activate the 2nd function.
The F indicator is displayed for approx. 5 seconds after
pressing the key.
CAUTION:
You must press the 2nd function while the F indicator is lit, or the
radio will perform the function printed on the key, rather than the
function printed above it.
@ M: Memory key
The [4] key is used to select the desired memory
channel.
The operation is similar to that of the _] key, in that, the
M indicator will illuminate for 5 seconds in the LCD display.
CAUTION:
The memory channel must be selected within 5 seconds of press-
ing the key.
@ ENTER key
The key is used to enter a frequency selected by the
numeric keys.
@ SCAN key
The key is used to start or stop the scan function.
© PRIORITY CHANNEL CHECK key: [-_] then 1/PRIO
These keys are used to monitor whether the priority chan-
nel (CH 1) is busy or not. When this function is activated,
the radio will switch to CH 1 approximately once every 10
seconds.
To cancel this function, press these keys again.

© BEEP key: then 2/BEEP
Each time these keys are pressed, the audio annunciator will
be turned ON or OFF alternately.
© (FREQUENCY) STEP key: then 3/STEP
Each time these keys are pressed, the frequency scanning
step size will be increased 5 kHz.
Several different scan function keys and scan stop keys are
provided.
© BAND SCAN key: [-_] then 4/BAND
@ MEMORY SCAN key: then 5/MEMORY
@ PROGRAMMABLE BAND SCAN key: [Z] then
6/PROGRAM
@ SEEK OPERATED SCAN key: [-_] then 7/SEEK
@ TIME OPERATED SCAN key: [_] then 8/TIME
© CARRIER OPERATED SCAN key:[-_] then 9/CARRIER
For additional information on this function refer to page 14.
©@ TX. STOP key: then M/TX. STOP
Pressing these keys will prevent accidental transmission.
To cancell this function, press these keys again.
© KEY LOCK key: [E] then ENTER/KEY LOCK
Depress
these
keys
and
the
frequency
and
other
settings
will
remain
unchanged
by
keyboard
operation
except
the
LAMP
key.
To cancel this function, press these keys again.
© FAST [7] key: then V/FAST
© FAST [{] key: then A/FAST
© LOCK OUT key: then 0/L.OUT
Each time these keys are pressed, the Memory channel lock
out function will be turned ON or OFF.
10
OPERATION
@ RECEIVE
After
power
and
antenna
connections
have
been
completed,
set the switches as follows:
1.
Turn
the
VOL
control
clockwise
to
turn
on
power.
The
frequency
on
the
LCD
display
will
show
the
transceiver
is
operating.
2.
As
the
VOL
control
is
turned
clockwise,
either
back-
ground
noise
or
a
QSO
will
be
heard.
3.
To
eliminate
the
no-signal
noise
turn
the
SQL
control
clockwise.
4. Enter the desired frequency.
@ TRANSMIT
Precaution:
Check
the
intended
transmit
frequency
before
operating
to
prevent
interference
with
other
stations.
If
you
are
using
T.
SQ
(Tone
Squelch)
press
the
MONITOR
key
to
allow
the
Squelch
to
open.
1.
Simply
depress
the
PTT
switch
and
the
indicator
will
light.
2.
Speak
into
the
microphone.
Recommended
distance
to
the
microphone
is
approximately
2
inches
(5
cm).
CAUTION:
Long
transmission
or
extended
operation
in
the
6
watt
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.

@ FREQUENCY SELECTIONS
Two different methods are provided for frequency selection.
@ UP/DOWN key frequency selection
1 Pressing either the [£] or the [2] key momentarily
will cause the displayed frequency to change 1 step up
or down, respectively.
The step size is selected by pressing the [J and the
3/STEP key from 5 step sizes (5, 10, 15, 20, 25 kHz).
1 step up AO. 1 step down OX
2 Pressing the [2] or the [©] key for more than 1 se-
cond will cause the frequency to change up or down con-
tinuously until the key is released.
3 Pressing the followed by holding the [£] or the
[1 key will cause the frequency to change quite
rapidly.
Rapidly
up
Rapidly
down
FR ADL EO
Repeating this operation shifts the displayed frequency as
shown below.
fo Up by selected capa fe Down by selected SRF
Lower Limit Upper Limit Lower Limit Upper Limit
® Direct keyboard frequency entry
Press the key.
Enter the frequency to the nearest kHz.
For example
|
HS500-
>
etx!
—t—
.
The receiver will not change frequency until all digits have
been entered.
If you should make an error before entering all digits, press
the [xa] key twice, and reenter all digits.
11

@ REPEATER OPERATION
© Transmitter offsets
All
amateur
radio
repeaters
utilize
a
separate
receiver
and
transmitter
section.
The
receiver
frequency
may
be
either
above
or
below
the
transmitter
frequency.
The
transceiver
allows
you
to
store
the
frequency
and
offset
in
memory,
or
you
can
select
the
offset
and
offset
frequency
from
the
keyboard.
Offset direction
To
select
the
desired
offset,
press
the
OFFSET/F
key.
Each
time
you
press
the
key
the
radio
will
advance
from
one
off-
set
to
the
other,
i.e.
‘’+’’
to
‘’—’’
to
no
offset
or
simplex.
Offset
frequency
selection
To
select
the
desired
offset
frequency,
press
the
[E_]
and
the
OFFSET/F
key.
The
display
shows
present
transmitte
offset.
Press
either
the
EZ]
key
or
the
[2]
key
momentarily,
the
frequency
change
100
kHz
step
up
or
down
from
lower
limit
100
kHz
to
upper
limit
9.9
MHz.
Press
the
[a]
complete
the
selection.
NOTE:
You
can
enter
any
offset
you
desire,
but
if
you
select
an
offset
that
would cause the radio to go out of band the radio will ignore the
programmed
offset,
and
transmit
in
the
simplex
mode.
(For
MARS
and
CAP
operators
who
have
modified
their
radios
to
cover
the
MARS and CAP frequencies this may not be the case. For these
sets
the
transceiver
will
accept
any
offset
that
does
not
take
it
out-
side
its
tuning
range.
See
the
instructions
supplied
with
the
MARS/CAP modification sheet.)
12
© Reverse function
Some
repeaters
utilize
a
‘reverse
pair’,
i.e.
the
transmit/
receive
frequencies
are
exactly
the
reverse
of
another
repeater.
For
example
repeater
A
uses
146.000
for
a
trans-
mit
frequency
(OUTPUT)
and
146.600
for
receive
(INPUT).
Repeater
B
uses
146.000
for
its
receive
and
146.600
for
its
transmit.
It
would
be
inconvenient
to
have
to
reprogram
the
radio
each
time
if
you
were
in
range
of
both
repeaters.
The
R/TONE.
F
key
has
been
provided
to
allow
you
to
reverse
the
transmit
and
receive
frequencies.
To
use
the
REVERSE
function,
press
the
R/TONE.
F
(or
press
and
hold
the
REVERSE)
key.
The
R
indicator
will
light
in
the
display.
To
return
to
normal
offsets
press
the
R/TONE.
F
(or
release
the
REVERSE)
key
again.
This
function
is
useful
to
check
the
input
frequency
of
the
repeater
so
that
you
Can
deter-
mine
if
you
are
within
SIMPLEX
range.
© Tone operations
Some
repeaters
require
the
use
of
a
control
signal
to
acti-
vate
the
repeater.
Several
versions
are
currently
in
use
worldwide.
These
transceiver
provides
a
subaudible
tone
encoder
with
38
standard
tone
frequencies.
To
activate
the
appropriate
tone
signaling
device,
depress
the
TONE
switch
on
the
top
of
the
radio.
The
decoder
section
is
an
optional
accessory
(TSU-4).
That
allows
for
T.SQ
(Tone
Squelch)
operation.
With
this
option
you
will
only
hear
those
stations
that
transmit
the
same
subaudible
tone
directly.

Tone frequency selection Tone Frequency
To select the tone frequency, [67.0Hz | 107.2Hz | 167.9Hz
press
the
[EL]
and_
the
|
219t2
|
110.9
Hz
|
173.8
Hz
= «, (24.4Hz_| 114.8 Hz | 179.9 Hz
R/TONE.F key. The display will [77.02 | 118.8 Hz | 186.2 Hz
show a operating tone fre- | 79.7 Hz | 123.0 Hz | 192.8 Hz
82.5 Hz_| 127.3 Hz | 203.5 Hz
quency. 85.4Hz_| 131.8 Hz | 210.7 Hz
Press either the £] key or the [88.5 Hz | 136.5 Hz | 278.1 Hz
91.5Hz | 141.3 Hz | 225.7 Hz
[X] key momentarily, the fre- [oaeHz [146.2 He | 233.6 Hz
quency
will
change
1
step
up
or
|_97.4
Hz
|
151.4
Hz
|
241.8
Hz
100.0 H: 156.7 H; 250.3 H;
down. Press the key to = 2 2
: 103.5 Hz | 162.2 Hz
complete the selection.
Tone Squelch operation
To actuate the tone squelch function (decode), turn the
Squelch control fully counterclockwise past the detent.
Squelch will now open only when the radio receives the
same subtone frequency. To return to normal noise activated
squelch, turn the Squelch control clockwise past the detent.
It is a good operating practice to check the frequency be-
fore transmitting. A MONITOR switch has been provided
for this purpose when using the TONE SQUELCH function.
Pressing this switch will open the squelch so you can check
for activity.
NOTE:
97.4 Hz is available only for encode.
® Autopatch operations
Some repeaters offer a service known as AUTOPATCH. This
allows you to dial a telephone number from your radio and
carry out a telephone conversation, much like a car tele-
phone, or cellular telephone.
This function requires the use of a DTMF (Dual Tone Multi
Frequency) pad. This is also known as a touch tone pad.
It operates just like the touch tone pad on your home tele-
phone. In addition to the normal 12 keys that are found on
your telephone the transceiver also provides 4 additional
keys A, B, C, and D. These keys are required by some repeat-
er systems for various control functions. You should check
with the control operator of your repeater to determine if
their use is required. A chart is provided that lists the tones
that are generated when you press each key.
To use the touch tone pad you should first key the radio
using the PTT switch. Then simply press the numbers cor-
responding to the telephone number you want to dial. If you
do not want to have to hold the PTT switch depressed while
dialing you can use the procedure described below.
1. Turn the POWER switch OFF.
2. Press and hold the key.
3. Turn on the POWER switch.
4. Release the key.
Audio tones (Hz)
‘Column
Then, after VOU, have 1209 | 1336 | 1477 | 1633
pressed the first number |Row
key the radio will remain | 697 1 2 3 F=A
keyed for approximately 2
seconds. The radio remains | 770 4 5 6 | M=B
keyed after you press each
number for this 2 seconds | 852 7 8 By a ATED
interval.
941 rs Co) ‘e SCAN
13

SCAN
Scan is initiated by pressing the faa] key.
The transceiver will stop on a busy channel. When an in-
coming signal is detected during scanning, the BUSY in-
dicator will light. In order for this function to operate the
SQL control must be adjusted to the threshold point. Scan
direction can be selected by either the [2] or the [7]
key before initiating scan.
The selected scan mode and scan stop mode indicators will
flash ON and OFF during scanning.
@ SCAN MODES
1. BAND SCAN MODE: Scans the entire band.
2. MEMORY SCAN MODE: Scans the memory channels
repeatedly, skipping the vacant channels.
3. PROGRAMMABLE BAND SCAN MODE: Scans between
the frequencies stored in memory channels 8 and 9.
If the frequency stored in memory channel 8 is the same
or greater than in memory 9, or if either or both chan-
nels are vacant, scan will proceed over the entire band.
If SCAN is initiated while the displayed frequency is out-
side the range specified in memory channels 8 and 9, scan
will proceed outside of the programmed limits.
In the BAND SCAN and PROGRAMMABLE BAND SCAN
MODE, scan proceeds according to the selected step size.
®@ SCAN STOP AND RESUME MODES
1. SEEK OPERATED SCAN: Scan will stop on a busy chan-
nel. Scan will not resume until the fax] key is pressed
again.
14
2.
TIME
OPERATED
SCAN:
Scan
will
stop
on
a
busy
chan-
nel
and
resume
approx.
5
seconds
afterwards.
Scan
will
resume
even
if
the
station
is
still
present.
3. CARRIER OPERATED SCAN: Scan will hold as long as
the signal is present and resume scan after a 2 secorid
delay if the signal drops out.
Releasing scan: Press one of the following keys during scan-
ning to clear the scan mode.
a) Bex] key b) switch
@ BEEP TONE
Audible
confirmation
of
microprocessor
function
is
provided
in
the
form
of
a
series
of
audio
beeps.
To
activate
beep
tones,
press
the
F_]
key
and
2/BEEP
key.
The
radio
will
then
supply
audio
confirmation
according
to
the
chart
below.
Scale Bsoauency, Key operation
A 440.00 | MRO
At 466.16 | MR1
B 493.88 | MR2
c 523.25 | MR 3, SAVE ON
C# 554.37 | MR 4, OFFSET
D 587.33 | MR 5, To select OFFSET Frequency
D# 622.26 _| MR 6, REV, To select Tone Frequency
E 659.25 | MR 7, TXSTOP, SAVE AUTO
F
698.46
|
_MR
8,
To
change
the
rate
of
Power
Save
time,
ENTER
Fe 739.98 | MR 9, KEYLOCK
G 783.98 | DOWN, SAVE OFF
G# 830.61 | UP
A 880.00 | F
A# 932.33 | M
B 987.77 | Stopping scanning
F 1396.91 | Key operation without effect

H@ MEMORY
@ MEMORY CHANNELS
The 10 memory channels (1 through 9, and 0) are available
for data entry. Channel 1, 8 and 9 have the following func-
tions in addition to its ordinary function.
Channel 1 is the Priority Alert Channel.
Channel 8 is the lower, and channel 9 is the upper limit fre-
quency for the programmable band scan operation.
The 10 memory channels are the Odd Split channel.
Each memory channel can store RX Frequency, F. STEP sta-
tus, OFFSET, REVERSE switch status and TONE Frequency.
@ MEMORY ENTRY -
Press the [@] key. The display will g
indicate M and any memory channels 1819)
that contain data. (Ex. 1, 4, 7, 8, 9) M
2. Press the desired memory channel
number (Ex. 5) within 5 seconds of as
essing the key. This will actu-
pressing the Dt] key u Hoe
ally store the information into memory.
@ MEMORY RECALL
Simply press the desired memory channel key and the ra-
dio will switch to this frequency.
To return to the original operating frequency, press the same
memory channel key again.
@ ODD SPLIT MEMORY CHANNEL
Memory channels store both a transmit, a receive and TONE
frequency. These channels will allow operation on ‘‘Odd
Split’’ repeater channels.
(For example CH 0)
1. Select the desired receiver frequency, tone status, tone
frequency, etc.
2. Press the [Et] and then the [7] key to store this part
of the data into memory.
. Select the desired transmitter frequency.
. Press the EX] key.
. Within 5 seconds of pressing the I] key press and
hold the PTT switch. The PTT switch will not initiate
transmit during the programming of this channel.
6. Press the [-] key within 5 seconds of pressing the PTT
switch to complete the operation. After you have pressed
the [7] key in this step you may release the PTT key.
ok Ww
To operate on memory channel O you
need only press the [2] key. The — and
the + indicators will turn on to indicate
that this memory channel now contains [0]
odd split frequency data. =e
To cancel this odd split data simply store a new frequency
into the memory channel.
15

@ MEMORY CHANNEL LOCKOUT
The Memory Channel Lockout function allows you to tem-
porarily skip unwanted memory channel(s).
1. Select the memory channel you wish to skip.
2. Press the [] key. The F indicator will illuminate.
3. Press the [2] key within 5 seconds. The selected
memory channel number will flash as an indication the
Memory Channel has been locked out.
NOTE:
The channel number will not flash while the display is showing
M and the listing of the memory channels that contain data. It
will only flash when you recall the individual memory channel
from the front panel directly.
4. To cancel the lockout press the desired memory channel num-
ber key and then press the [_] and [¢] keys again.
@ CLEARING A SPECIFIC MEMORY CHANNEL
1. Press the D1] key. The display will
indicate M and any memory channels us
that contain data. (Ex. 1, 4, 5, 7, 8, 9) 71819]
M
2. Press the key. The F indicator
will illuminate. 1]
1415}
171819}
FM
16
3. Press the key that corresponds to the
channel you want to clear (Ex. 7) wi-
thin 5 seconds of pressing the
key. The M, F, and channel number dis-
play will clear indicating the operation
has been completed.
4. To confirm the data was erased press
the Dt] key. a
(From our example the [g@ will now be
gone.)
®@ CLEARING ALL MEMORIES
(=Microprocessor Initialization)
To erase all data from the memories, turn the power switch
on while pressing both the and the keys together.
@ MEMORY BACK-UP BATTERY
The transceiver includes a lithium back-up battery to retain
memory in the microprocessor. When changing batteries,
or if the Ni-Cd batteries should fully discharge, memory will
always be retained.
lf the display should begin to show erroneous information
or numbers, the lithium battery needs replacement.
This should be performed by an authorized KENWOOD deal-
er since these components are easily damaged by static elec-
tricity.
@ PRIORITY ALERT CHANNEL CHECK
Memory channel 1 can be monitored at about 5 seconds
intervals to check for activity.

Press the [E] key and then the 1/PRIO key, will ap-
pear on the display.
If the channel is busy, the indicator blinks, and if the
BEEP function is ON, a beep will sound.
To stop the function, press the [_] and 1/PRIO keys
again.
The function does not operate during scan or transmission.
@ BATTERY SAVER
Battery Saver operation provides to turn ON or OFF battery
power automatically during reception and thus extend oper-
ation time.
2 ACTIVATION MODES
1. SAVE MODE: The transceiver will activates the battery
saver circuit 2 seconds after the squelch closes.
2. AUTO SAVE MODE: The transceiver will activates the
battery saver circuit 1 minute after the last key opera-
tion during the squelch closes.
To select the desired Battery Saver Mode, press the
key. Each time press the key, radio will advance from SAVE
to AUTO SAVE to OFF.
The indicator will light;
SAVE MODE : SAVE]
AUTO SAVE MODE : [AUTO/ SAVE]
OFF : No indicator
Power Save Ratio Selection
To alter the actual length of time the receiver section shuts
down, press the key and then the fae] key. The dis-
play will show the time the radio will be operating at reduced
power levels (Ex. 1 : 1). =
Use the [2] or the [4]
key to select the desired
save ratio from 1:1 to
Tegt
Press the key to complete the selection.
The radio will operate at reduce power consumption accor-
ding to the accompanying diagram.
For example;
ON OFF
rt meet Wile ad lilo een
ON OFF
[--2.---] means i |
ON OFF
[--9.---] means | |
» il tesal
40.3 SEC
When a signal is received, the function is automatically can-
celled.
Since the receiver section shuts down, the squelch may not
open by pressing the MONITOR switch.
17

MAINTENANCE
@ IN CASE OF DIFFICULTY
WHEN USING SUM-3/AA BATTERIES, ENSURE THE BAT-
TERY POLARITY AND VOLTAGE IS CORRECT BEFORE
PROCEEDING.
No sound from the speaker. No signal can be received.
1. Squelch is closed. Turn the SQL control counter-
clockwise.
2. T.SQ is activated. Turn the SQL control clockwise past
the detent position.
3. PTT switch of microphone is pressed setting the unit
in the transmit mode. Turn PTT switch off.
No control works.
KEY LOCK is ON. Press [] key and KEY LOCK key.
No output
1. Microphone jack is not fully plugged in. Insert the plug
fully.
2. Poor antenna connection. Connect antenna securely.
Memory loss.
Backup battery voltage is low. Contact your authorized
dealer.
All the indicators go out on the display.
Turn the power switch OFF and then ON.
The and/or indicator begins to blink.
The indicator will come on when the battery
needs recharging. If you continue to operate and the
and/or indicator begins to blink the radio
will no longer operate properly.
Replace/Recharge the battery when the indica-
tor comes on.
18
@ SERVICE
Should it ever become necessary to return the equipment
to your dealer or service center for repair, pack in its origi-
nal box and packing, and include a full description of the
problems involved. Also include your telephone number. You
need not return accessory items unless directly related to
the service problem.
Service note: Dear OM, if you desire to correspond on a
technical or operational problem, please make
your note short, complete, and to the point.
And PLEASE make it readable.
Please list: Model and serial number.
The question or problem you are
having.
When claiming warranty service, a photocopy
of the bill of sale, or other proof of purchase
showing the date of sale must accompany the
radio.

PROGRAMMABLE TONE
DECODER UNIT
TSU-4 (
SPEAKER MICROPHONE
SMC-30 sy
SOFT CASE
SC-27 (for pp-12)
oe
Ni-Cd RECHARGEABLE
BATTERY PACK
PB-1
12V 800mAh
Charge with
BC-7/8 only.
Ni-Cd RECHARGEABLE
BATTERY PACK
PB-1
8.4V 500mAh
RAPID CHARGER’
BC-7,
(for PB-'
1/2/3/4)
SWIVEL MOUNT
BH-5
TELECOPING ANTENNA
RA-3
SOFT CASE
SC-13
(for PB-1/4)
aa
SOFT CASE
SC-12 (for PB-2/3)
a
_
POWER SUPPL
Ni-Cd RECHARGEABLE
BATTERY PACK
PB-3
7.2V a |
Charge with
BC-7/8 only.
Ni-Cd RECHARGEABLE
BATTERY PACK
B: 4
7.2V 1600mAh
BB: with
BC-7/8 only.
ora CAHRGER
BC ce 1/2/3/4)
MICRO_HEADPHONES
HS-7
Hiss HEADPHONE
MOBILE MOUNTING
BRACKET
M
FILTERED CIGARETTE
PG_3E CORD
DC CABLE ic
PG-2V
a
AA MANGANESE/
ALCALENE BATTERY
CASE
BT-5
BATTERY CHARGER
BC-2 (for PB-2 only)
Ni-Cd RECHARGEABLE
BATTERY PACK
PB-12
12V 500mAh
NOTE:
Some optional accessories may not be available in your areas.
Some cars may not be suitable to hook the MB-4 into the window.
HMC-1 vox headset cannot be used.
@ PROGRAMMABLE TONE DECODER
nN
2
UNIT (TSU-4) Fig. 1
Cushion
Connector
Rear panel
. Remove the four phillips head screws from the rear panel
of the radio.
. Gently remove the front panel. The panel should be ro-
tated away from the PTT switch side.
. Remove the foam cushion attached to the bottom of the
set. Install the tone squelch unit between the bottom of
the set and the main circuit board as shown in Fig. 1.
Attach the cable from the TSU-4 as shown in Fig. 2. The
cable should be routed under the ribbon cable that goes
to the front panel.
. Remove the backing from the foam cushion that was pro-
vided with the TSU-4 and attach the cushion to the edge
of the TSU-4.
Replace the covers and tighten screws to complete the
installation.
19

KENWOOD