Kenwood TH-225A User manual

ПООЛ\МАЗЯ
144MHz FM TRANSCEIVER
TH-225A
INSTRUCTION
MANUAL
KENWOOD CORPORATION
Downloaded by
RadioAmateur.EU
CPRINTED IN JAPAN B50-8334-00(K, PIT)
9012110987854321 89/21110

‘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: E e
Long transmission or extended operation in tho 6 watt mode might
‘cause the rear of this transceiver to get warm. Do not place tho
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-
ду. 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
Repeater operation
Transmitter offsets
Reverse function
Tone operation
‘Auto patch operations ...
Scan...
Beep tone
Memory ...
Memory channels
Memory entry
Memory recall
Odd Split memory channel.
Memory channel lockout
Clearing a specific memory channel
Clearing all memories.
Memory
back-up
battery
Priority alert channel check
Battery saver
16

MAINTENANCE........
In case of difficulty
Service
OPTIONAL ACCESSORIES...
Programmable tone decoder unit TSU-4
BLOCK DIAGRAM..........—.
SCHEMATIC DIAGRAM
ACCESSORIES
Unpack your transceiver carefully and cor
that itis sup-
plied with the following accessories.
Antenna for 144 MHz.....T90-0352-05,
Rubber cap..
Belt Ноок.........
Machine Screw ..
Spring washer.
Ni-Cd Battery pack
(РВ-12).......... -W09-0541-05..
Battery charger (120 V) ..W09-0517-05
DC cable (PG-2V) Е30-2078-25
Instruction Manual .........850-8334-XX ..
Warranty Card... Ré -

SPECIFICATIONS
FREQUENCY
RANGE
(Mb
=
чакооо-—
таз:
MODE
[377
OPERATING
TEMPERATURE
EIN
ANTENNA
IMPEDANCE
ET)
POWER
REQUIREMENT
BATTERY
PARK
E3
V-15
VOC
(12
VOC
запі
3.
DCN
22
V=16
VOC
013:8
VDC
nominal)
E.
DTRASWTMODE
возм
Less
than
13A
&|
{4
[Low
mansur
море
os
w
noa
Lees
thn
0.7
25
[теме
mone
ите
no
cna
Е
Apoc
60
mA
BATTERY
SAVER
MODE
А.Т
6)
Арек
1
mA
DIMENSIONS
СТГ
ИН
DITE
й
(PROJECTIONS
CLUDED)
70%
198%
40
imm
жент
With
Ме
Са
batter
and апы
OUTPUT POWER
We
зво
[win Po wh PET
Ё With РВ-2 -
With Раз PEE
H " um
$ [mouar — —
© [ MAXIMUM EREGUENCY DEVIATION
SPURIOUS RADIATION S
L'oncumv DOUBLE CONVERSION SUFERHETERGOYRE
INTERMEDIATE
FREQUENCY
reg
=
тєзмнє
&
ЕТТ
FT
§
sms
—
1248
SAD
-
‘oe
than
0217
8
|
saveton
sensu
Lane
than
0.1
AV
Е
захотите
а
Moe
than
12
Ki
ET
Lose
than
24H
‘AUDIO
OUTPUT
POWER
lass
8
oad
10%
dto
Mor
than
800
mW
NOTE:
Circuit
and
ratings
are
subject
to
change
without
notice,
due
to
development
in
technology.
Downloaded by
RadioAmateur.EU

ВАТТЕВҮ РАСК
Installing the battery pack
Match the concave part at the
bottom of the radio 10 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.
g
Pressing the battery release
button, turn the battery pack
counterclockwise.
Ni-Cd BATTERY PACK (РВ-12)
quire several charge/discharge cycles before you can expect to see
ing period between charges. If the battery will
y than 2 months it should be recharged before
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 wil iluminate
to show that the pack is charging. The LED will remain on
эв 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 Ме and battery performance will be reduced if you
exceed the recommended charge period.
NOTES: M ————
ө Turn off the power switch before charging
Recharging should be de ап ambient temperature bet-
ween 10°C ~ 40°C (50° Р). Recharging performed out
of this range fully charge the battery.
MANGANESE or ALKALINE BATTERIES
Load 6 x R6 (AA) manganese or
alkaline batteries in series in the sup-
plied battery case. (Be sure to ob-
serve the polarities.)
(We recommend ‘use of high-
perfomance manganese batteries.)
Battery pack (1) can be inserted
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
correctly.
Inserting
the
battery
by
force without checking the shape
may damage the case.
OPERATING TIME
Bart vote resin. I
Е, = үсе
M АҒ OUTPUT. 0.35 wis 0
ааа
à E
Туена
5 argen ШД n
э 55 59 Tus zip aa
Manganese battery (except Alkaline manganese battery) is
suitable only for LOW power transmission.
harge the Ni-Cd battery pack when the BATT indicator
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.
(2) DC IN terminal
This terminal is used for an external power supply. Input
voltage is 13.8 VOC 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.
®-®)
CAUTION:
—
—
——
Asa precaution, do not remove the bat-
tery
pack
when
an
external
power
sup-
ply
is
used.
Use
the
KENWOOD
PG-2V
ог
PG-3E
optional
cable
for
the
con-
i]s
@ 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 КЇ and the DC voltage on this terminal
isav.
(3) SP jack
This jack is used for an earphone or external speaker. The
recommended impedance is 8 0 nominal.
© TONE switch
This switch is used to activate the sub-audible tone encoder.
© нж YLOW ( ~ )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
(8) VOL control
Volume control with power ON/OFF switch.

(8) MONITOR switch
Pressing this key will open squelch.
(9 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 counterciock
@ LAMP key
key controls the lamp on the LCD display.
@ 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 С and the OFFSET/F key in order
change the desired offset frequency.
@ R/TONE. F key
This key is used to reverse the transmit/receive frequencies
used to
TONE. F: TONE FREQUENCY кеу
Pressing the [EJ] and the R/TONE. F key in order is used
to change the frequency of the tone encoder.
® SAVE ke
The SAVE key is used to select the power save condition
during the receive mode.
Pressing the С) and the SAVE ke
change the battery saver on/off ratio.
SPEAKER
@ MICROPHONE
BATTERY CASE
in order is used to

© Display
900
@
OROK]
© FREQUENCY display
Displays the operating frequency.
© emo : ON when the Priority Alert function is
active
Flashes when the channel is busy.
: Displays the selected power save соп.
dition;
(КОТО,
SAVE]
for
suto
save
mode,
SAVE) for save mode, and no indicator
Tor OFF.
@
eusv
ОМ
whenever
the
squelch
opens
dur-
ing receive.
ON all the time if the squelch control
is rotated counterclockwise, ond the
T.SQ is off.
© гендж) : ON during transmit modo.
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.
ї Indicates for approx. 5 seconds after
pressing
the
[7]
key.
plays
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 [Y] key.
ї
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
fis
These 13 keys except the С 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: Г] - С, 2)
Theso
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.
М. channel 1 is used to store the Priority Alert channel
formation.
M. channel B is used to store the lower, and M. channel 9
the upper limit frequency for the programmable band scan.
© UP/DOWN keys: ŒJ , ŒI
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 С key is used to activate the 2nd function.
‘The F indicator is displayed for approx. Б seconds after
pressing the Z] key.
СА
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 [€] key is used to select the desired memory
channel.
The operation is similar to that of the [Z] key, in that, the
M indicator will illuminate for 5 seconds in the LCD display
CAUTIOI
The memory channel must be selected within Б seconds of press-
кеу.
© ENTER key
The E key is used to enter a frequency selected by the
numeric keys.
*
SCAN
key
The
Ez]
key
is
used
to
start
or
stop
the
scan
function,
© PRIORITY CHANNEL CHECK key: [Z] 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 ag:

[27 then 2/ВЕЕР
Each time these keys are pressed, the audio annunciator will
be turned ON or OFF alternately.
©
(FREQUENCY)
STEP
key:
[Z]
then
3/STEP
Each
time
these
keys
are
pressed,
tho
frequency
scanning
step
size
will
be
increased
5
kHz.
Several different scan function keys and scan stop keys are
provided.
* BAND SCAN key: [Z] then 4/8AND
* MEMORY SCAN key: [Z] then 5/MEMORY
©
PROGRAMMABLE
BAND
SCAN
key:
[©]
then
S/PROGRAM
©
SEEK
OPERATED
SCAN
key:
[Z]
then
7/SEEK
TIME OPERATED SCAN key: [7-] then 8/TIME
* CARRIER OPERATED SCAN көу:[7_] then S/CARRIER
For additional information on this function refer to page 14.
*
TX.
STOP
кву:
[7]
then
M/TX.
STOP
Pressing
these
keys
will
prevent
accidental
transmission.
To
cancell
this
function,
press
these
keys
agai
*
KEY
LOCK
key:
[Z]
thon
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 СО] key: С] then V/FAST
*
FAST
[2].
key:
[7]
then
A/FAST.
© LOCK OUT key: [7] then O/L.OUT
Each time these keys are pressed, the Memory channel lock
out function will be turned ON or OFF.
OPERATION
Ш 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.
18 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
E]
indicator
will
light.
2.
Speak
into
the
microphone.
Recommended
distance
to
the
microphone
is
approximately
2
inches
(5
cm).
CAUTION:
Lm
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.
Downloaded by
10 RadioAmateur.EU

E FREQUENCY SELECTIONS
Two different methods are provided for frequency selection.
* UP/DOWN key frequency selection
1 Pressing either the С] or the [Y] key momentarily
will cause the displayed frequency to change 1 step up
ог down, respectively.
The step size is selected by pressing the С) and the
З/ЅТЕР key from 5 step sizes (5, 10, 15, 20, 25 kHz).
imow NECS
2 Pressing the [2] or the [Y]. key for more than 1 se
cond will cause the frequency to change up or down con-
tinuously until the key is released.
З Pressing the [£] followed by holding the [4] or the
[X]
key
will
cause
the
frequency
to
change
quite
rapidly. вәрау ыр Rapidly down.
FRO
aO
me
Y
Repeating this operation shifts the displayed roquency as
shown below.
Г” Um by selected sop —y p= Down by selected step =)
зоа Upper Limit Lower Limit Upper Limit
Ji L }
© Direct keyboard frequency entry
Press the [99]. key.
Enter the frequency to the nearest kHz.
For example
oono.
The receiver will not change frequency until all digits have
been entered.
If you should make an error before entering ай digits, press
the E key twice, and reenter all digits.
"

Ш 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
[7]
and
the
OFFSET/F
key.
The
display
shows
present
transmitte.
offset.
Press
either
the
С]
key
or
the
С]
key
momentarily,
the
frequency
change
100
kHz
step
up
or
down
from
lower
limit
100
kHz
to
upper
limit
9.9
MHz.
Press
the
E]
key
to
complete the selection.
нот:
—
—
—
ии
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.
ir radios to cover the
Iuencies this may not be the case. For th
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
pi
.
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
de
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, [ 3795: 119
press
the
E]
and
те
isi
R/TONE.F key. The display wi ‘One
show a operating tone fr
quency
Press either the [E] key or the
[T] key momentarily, the fre- ыты
quency
will
change
1
step
up
or
55s
|
181
down. Press the E key to posi Werte
complete the selection. x
aen
Noon
27
зењ [3
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.
Nore; —— — ——— n
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 РТТ 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 [Œ] key.
3. Turn on the POWER switch.
4. Release the E] key. i tones
Then, after you have Т
pressed the first number |x
key the radio will remain | oo | x | 2 | э |т-л
keyed for approximately 2
seconds. The radio remai
keyed after you press each
number for this 2 seconds | * | 7 | * | а јела
interval.
i
13

Ш SCAN
Scan is initiated by pressing the 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
[4]
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
ог 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 Ex] key is pressed
again.
4
2. TIME OPERATED SCAN: Scan will stop on a busy chan-
nel
and
resume
approx.
5
seconds
afterwards.
Scan
wil
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
second
delay
if
the
signal
drops
out.
Releasing scan: Press one of the following keys during scan-
ning to clear the scan mode.
а) E key b) Ez]. switch
И BEEP TONE
Audible
confirmation
of
microprocessor
function
is
provided
in
the
form
of
a
series
of
audio
beeps.
To
activate
beep
tones,
press
the
С]
key
and
2/BEEP
key.
The
radio
will
then
supply
audio
confirmation
according
to
the
chart
below.
Ss EDI

E 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 Chann
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
Rress the [Œ] key. The display will
indicate M and any memory channels
that contain data. (Ex. 1, 4, 7, 8, 9)
2.Press the desired memory channel
number (Ex. 5) within 5 seconds of
pressing the EŒ] key. This will actu-
ally store the information into memory.
* MEMORY RECALL
‘Simply press the desired memory channel key and the ra-
io will switch to this frequency.
To return to the original operating frequency, press the samo
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 О)
1, Select the desired receiver frequency, tone status, tone
frequency, etc.
2. Press the [Œ] and then the [©] key to store this part
of the data into memory.
3. Select the desired transmitter frequency.
4. Press the [V]. key.
5. Within 5 seconds of pressing the [Y] key press and
hold the PTT switch. The PTT switch will not initiate
transmit during the programming of this channel.
6. Press the [E] key within 5 seconds of pressing the PTT
switch to complete the operation. After you have pressed
the [Z] key in this step you may release the PTT key.
To operate on memory channel О you
need only press the [2] key. The — and
the + indicators will turn on to indicate.
that this memory channel now contains
odd split frequency data.
то
cancel
this
odd
split
data
simply
store
a
new
frequency
into
the
memory
channel.

© 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 [5] 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
M and the listing of the memory chan
will only flash when you recall the individual memory channel.
{rom the front panel directly
4. To cancel the lockout press the desired memory channel num-
ber key and then press the [7] and [E keys again.
* CLEARING A SPECIFIC MEMORY CHANNEL
1. Press the [Y]. key. The display will
indicate M and any memory channels.
that contain data. (Ex. 1, 4, 5, 7, 8, 9)
2. Press the [I] key. The F indicator
will illuminate.
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 wil clear indicating the operation
has been competed,
4. To confirm the data was erased press
the EE] key.
(From our example the E 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 [7] and the [E] 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.
If the display should begin to show erroneous information.
ог 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.
I PRIORITY ALERT CHANNEL CHECK
Memory channel 1 can be monitored at about 5 seconds
intervals to check for activity.

Press
the
[Z]
кеу
and
then
the
1/PRIO
key,
E]
will
ap-
pear
on
the
display.
If the channel is busy, the ЕШ] indicator
BEEP function is ON, a beep will sound.
ks, and if the
To stop the function, press the С] and 1/PRIO keys
again.
The function does not operate during scan or transmission.
E 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 oper:
tion during the squelch closes.
To select the desired Battery Saver Mode, press the ex]
key. Each time press the key, radio wil advance from SAVE
to AUTO SAVE to OFF.
The indicator will light;
SAVE MODE : SAVE
AUTO SAVE MODE : [AUTO AVE
OFF 2 No indicator
Power Save Ratio Selection
To alter the actual length of time the receiver section shuts
down, press the С key and then the E] 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 С]
key to select the desired
save ratio from 1:1 to
1:9.
Press the [EE] key to complete the selection.
The radio will operate at reduce power consumption accor-
ding to the accompanying diagram.
For example;
vec s Ир
ON о
[К
.—] means
оч оғ
50.3 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.
7

MAINTENANCE
W 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. Tum the SQL control counter
clockwise.
2. T.SQ is activated. Turn the SQL control clockwise past
the detent position.
3. РТТ switch of microphone is pressed setting the unit
in the transmit mode. Turn PTT switch off
No control works.
KEY LOCK is ON. Press [Z] 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.
Ali the indicators go out on the display.
Turn the power switch OFF and then ON.
The and/or EZ] indicator begins to blink
The indicator will come on when the battery
needs recharging. If you continue to operate and the
and/or [£s] indicator begins to blink the radio
will no longer operate properly.
Replace/Recharge the battery when the indica-
tor comes on.
W 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 ist: Model and serial number.
The question ог problem you are
having.
When
claiming
warranty
service,
a
photocopy
о! the Ый of sale, or other proof of purchase
showing the date of sale must accompany the
radio.

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POWER SUPPLY
NLCA RECHARGEABLE NECA RECHARGEABLE АА MANGANESE,
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BC-7, COMPACT CAMROER
Lo BC-8
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Nore:
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.
E PROGRAMMABLE TONE DECODER
UNIT (TSU-4) Fig. 1
Front panel
1. Remove the four phillips head screws from the rear panel
of the radio.
2. Gently remove the front panel. The panel should be го-
tated away from the PTT switch side,
3. 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.
4. 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.
5. Remove the backing from the foam cushion that was pro-
vided with the TSU-4 and attach the cushion to the edge
of the 790-4.
6. Replace the covers and tighten screws to complete the
installation.
19

KENWOOD