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.
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