Kenwood TH-28A User manual

Shanna
144 MHz FM TRANSCEIVER
TH-28A/28E
430/440
MHz
FM
TRANSCEIVER
-48A/48E
INSTRUCTION
MANUAL
KENWOOD
CORPORATION
©PRINTED
IN
JAPAN
B62-0236-
Ee):
93/4654321
9242111098765432

Models
Covered
In
This
Manual
@ TH-28A:
@ TH-28E:
m@ TH-48A:
m@ TH-48A:
@ TH-48E:
Find It Fast
144MHz FM transceiver
144MHz FM transceiver
(U.K.and European version)
440MHz FM transceiver
(U.S.A.
and
Canadian
version)
430MHz FM transceiver
(Other market)
430MHz FM transceiver
(U.K.and
European
version)
For
quick
access
to
transceiver
features
and
functions,
consult
these
handy
listings:
m@
Contents
(page
3
and
4)
®
Quick
Reference
(page
61
and
62)
Notice to the user:
One
or
more
of
the
following
statements
may
be
applicable
to
this
equipment.
FCC WARNING
This
equipment
generates
or
uses
radio
frequency
energy.
Changes
or
modifications
to
this
equipment
may
cause
harmful
interference
unless
the
modifications
are
expressly
approved
in
the
instruction
manual.
The
user
could
lose
the
authority
to
operate
this
equipment
if
an
unauthorized
change
or
modification
is
made.
Information
to
the
digital
device
user
required
by
the
FCC:
This
equipment
has
been
tested
and
found
to
comply
with
the
limits
for
a
Class
B
digital
device,
pursuant
to
Part
15
of
the
FCC
Rules.
These
limits
are
designed
to
provide
reasonable
protection
against
harmful
interference
in
a
residential
installation.
This
equipment
generates,
uses
and
can
generate
radio
frequency
energy
and,
if
not
installed
and
used
in
accordance
with
the
instructions,
may
cause
harmful
interference
to
radio
communications.
However,
there
is
no
guarantee
that
the
interference
will
not
occur
in
a
particular
installation.
If
this
equipment
does
cause
harmful
interference
to
radio
or
television
reception,
which
can
be
determined
by
turning
the
equipment
off
and
on,
the
user
is
encouraged
to
try
to
correct
the
interference
by
one
or
more
of
the
following
measures:
Reorient
or
relocate
the
receiving
antenna.
Increase
the
separation
between
the
equipment
and
receiver.
Connect
the
equipment
into
an
outlet
on
a
circuit
different
from
that
to
which
the
receiver
is
connected.
Consult
the
dealer
for
technical
assistance.

CONTENTS
BOCESSORIES | oo. iscicjcs cider Bk pr corte tieas Bec 5
BEFORE OPERATION’ :*.-. 0c. ts: set eee 5
Controls Overview ............eeee eee eee 6
THE BATTERY PACK
1 NiCd Battery Pack (PB-13) ................ 8
2 RECHALGING 6: 0:0acsip sais sie 6 «0s PARQEE REE 8
3 Installing The Battery Pack ............... 8
4 Battery Voltage Level ....................
5 Battery Operating Time
RECEIVER OPERATION
Ti RANI StS os asa dining ee ocean mae 10
2 Selecting Frequency ..............000000 "1
3 Step SizeSelection ..................05. 12
4 Programmable VFO Tuning Limits ......... 14
5 Subband Reception ...................... 14
TRANSMITTER OPERATION
T RO Srensilh. » 6. cos..4nnis. AOI ASE 15
2 Changing Transmitter Output Power ....... 15
3 &X: Stop Functiedsqne temess na peitane 16
AFIS OUt TMG Fk? sos sa Sos dice ete teens 16
USING THE MEMORY
1 Microprocessor Memory Backup .......... 17
2 Entering Memory Data
3 Initializing The Memory
4 Memory Channel ..................000005
5 Memory Contents) .......6..0 ccc aee eset
6 Entering Split Channel Frequencies ........
7 Entering The Call Channel Frequency
8 Recalling Memory Channels ..............
S: MOMORSAHC .as:<ameccasats steep eeeniaouss
SCANNING
Hold/Resume Programming .............+ 22
BEAN: ODTHONS esate. os. 023 aguctaaity aoaaa eee 22
Scanning Memory Channels .............. 23
Locking Out Memory Channels ............ 23
Band SCannlng «..< ssstine p29 dn sede archaic 24
Programmable Band Scan ................ 24
MHzSean. ii3.53.3.0
VFO/Memory Scan ..
CALL/VFO Scan ......
CALL/Memory Scan
V/M/C(VFO/Memory/CALL)
Scan..........
26
REPEATER OPERATION
Hransmitter OFFSETS oo... sone e eect Care oe oe 27
Selecting the Offset Direction ............ 27
Automatic Offset Selection ............... 27
Manual Offset Selection
The Reverse Function
Mone Operationin. <5.6.. 6 6s oes cn 3
Autopatch
Operations
...................,
PRIME MOMONy. $32.8 oo 2/5 soda arsroreteende®
“Soewmnonanaon- bak
ONOaRWNDY =

CTCSS' OPERATION, oo o..c..0 0. so. gecnaryoreaes 33
THE DUAL TONE SQUELCH SYSTEM (DTSS)
TO BPSSICOI NI er tas este at weer 34
2°Using'the:DTSS Function® ©. v0.2... 34
3 Using DTSS with a Repeater .............. 35
PAGING
1 Paging Operation Overview ..............- 36
Paging Code Memory ...............00--
Setting Paging Codes ..................--
Sending Pages (Calling)
Receiving Pages (Wait) ..................
Canceling Signal Squelch
Locking OurCodes ea wereeesce ts
MESSAGE TRANSMISSION AND RECEPTION
1 Message Transmission Modes 42
Using the Message Memory ..............
Message Memory Check ...........--.--5
Message Memory Transmission ..
Message Reception ...............-20005
Receive Message Memory ..............-
ENHANCED RECEIVER FUNCTION
1 The ToneAlert System ...............05- 46
2 Monitor
3 Beep Off
4 PaMp.. 0.2:
5 Key Lock
NOOR WND
Oahwn
POWER SAVER FEATURES
1 The Battery Saver Mode ................. 48
2 Automatic Power Off (APO) ............... 48
CLOCK FUNCTION
HW WANG SUA) o67-:5:6.3)-'5 cise: 5110 estate ae ebzenmn 49
A aMIMOUEUNCTIONy 3.5. <0cc,s viewys a Fenn Coa 49
DURE: OPERATION: 5: 6c5c465 6655.0. RO 51
MAINTENANCE
1 General Information ..................00. 52
BOSONIC Pret a ete os ob sacar panel agaue see eiecs 52
3. (Record Keeping :.5..s5 scs.ncc ces ete Mae 52
TROUBLESHOOTING ....................65 53
ACCESSORIES
1 Installing the CTCSS Unit (TSU-7) ......... 55
2 Memory Expansion Unit (ME-1) ............ 56
3 Programming the SMC-33 Remote Control
Speaker Microphone ................00.
4 Using other microphones
5 Connecting an External Speaker .......... 59
SPEGIFIGATIONS 6 citi vx cacasiarsunnc's sabeiappne 60
QUICIGREEERENCE es ..csnuhsoaacanians 61

ACCESSORIES
Antenna (TH-28A/28E) ............ T90-0444-x
Antenna (TH-48A/48E) ............ T90-0445-x x
Belt Hook
Hand Strap
RUDD Ot CAD a cian iyo: gisn sisiishern ass boas BO9-0329- x x
AC plug (M type only) ............. E19-0254-X x
NiCd Battery Pack(PB-13) .......... W09-0563- x X
Battery Charger(BC-14)
for U.S.A. and Canada (120V)
G(s TPs sas .0 a REI ee as W09-0565- X X
for Europe (220V)
wigibnvee dag os aeacbeeey WO09-0569- x x
for U.K.version (240V)
its Bh cece RB ay rcdhaverere oes WO09-0568- x x
for Oceania (240V)
a ee eee Pe eree WO09-0567- x X
for other market (120/240V)
ROA KOMEN sa fa'ele die Gres WO9-0566- x X
Instruction Manual ................ B62-0236- x Xx
Warranty Card(U.S.A.,Canada,and Europe)
Note
Your transceiver comes with a portable flex
antenna. For fixed transceiver locations, we
recommend that you use a more permanent
antenna installation to help eliminate interference
and improve performance.
BEFORE OPERATION
Thank you for purchasing this KENWOOD
transceiver.
To
get
the
most
out
of
its
many
features,
we
suggest
you
read
this
instruction
manual
carefully,
and
keep
it
handy
for
further
reference.
To get ready to transmit and receive.
Check
the
accessories
list
to
be
sure
everything
you
need has been included in the package.
Charge
the
included
NiCd
battery
pack,
following
the
instructions
completely
before
proceeding.
When
you
have
everything
checked
out
and
charged
you're
ready
to
get
to
the
Receiver
Operation
section
and
get
up
and
running
with
your
new
equipment.
Other
sections
follow
in
a
logical
order
to
help
you
learn
and
use
this
transceiver
to
its
full
potential.
,
CAUTION
The
recommended
transceiver
duty
cycle
is
1
minute
of
transmission
and
3
minutes
of
reception.
Longer
transmissions
or
extended
operation
in
the
HI
power
mode
may
cause
the
back
of
the
transceiver
to
get
warm.
Do
not
place
the
transceiver
where
the
heat
sink
(rear
panel)
might
come
in
contact
with
plastic
or
vinyl
surfaces.

Controls Overview
This transceiver has different key layouts for each
destination. Check the version of your transceiver
first by looking at the following illustration.
Pag orss cress
FM TRANSCEIVER TH-28A 144MHZ
All types except U.K and European version
PAG orss cress
‘CeCe Cor), Gs
FM TRANSCEIVER TH-28E 144MHZ
U.K and Europe version only

This diagram will help you locate the keys, switches,
and knobs you'll need to perform necessary
operations. Please study these controls carefully. By
the time you reach the end of this manual, you will
have had to use each of them many times.
ANTENNA
(PUSH TO TALK
SWITCH)
LAMP KEY
MONITOR KEY
BATTERY PACK
All types except U.K and European version
VOL (VOLUME CONTROL)
SQL (SQUELCH CONTROL)
ANTENNA:
CONNECTOR
DC IN TERMINAL
MICROPHONE JACK
ON AIR
INDICATOR
SPEAKER
HEADPHONE JACK
| _anenna
(PUSH TO TALK
SWITCH)
U.K and Europe version only

THE BATTERY PACK
1 NiCd Battery Pack (PB-13)
You must charge the battery before you can use it. NOTE
It has not been charged at the factory in order to Recharging should be done within an ambient
provide you with the greatest number of charge/ temperature between 5°C ~ 40°C (41°F ~
discharge cycles. It takes several charge/discharge
cycles before the battery pack will operate for its
maximum period. If you store the battery pack for
more than two months, recharge it before use.
104°F). Recharging performed out of this range
may not fully charge the battery.
2 Recharging 3 Installing The Battery Pack
Insert the charge plug from the charger (BC-14) into Insert the battery pack into the transceiver until it
the receptacle on the top of the transceiver. Then locks in place.
plug the charger into the AC line. Do not allow the To remove the battery pack slide the Release button
battery to charge for greater than 15 hours. The to the right and pull the pack down.
useful life and battery performance will be reduced if
you exceed the recommended charge period.
RELEASE button
Transceiver
BC-14
(Illustrations show the U.S.A. version.)

4 Battery Voltage Level
The
meter
indicates
the
relative
battery
voltage
during
transmit.
Recharge
or
replace
the
batteries
when
the
level
reaches
the
low
indicator.
NiCd Battery pack
5
Battery
Operating
Time
(hours)
Fully charged Fully discharged
i—s
=
=
a tj
a a
PB-13 PB-14o0r
DC IN (13.8 V)
Approximate battery condition
Manganese or Alkaline Batteries
Load
6
X
R6
(AA)
manganese
or
alkaline
batteries
in
series
in
the
optional
battery
case(BT-8).
Be
sure
to
observe
the
polarities.
We
recommend
use
of
high
performance
manganese
batteries.
Manganese or Alkaline batteries
New
batteries
Need
to
change
batteries
Approximate battery condition
Transmitter output power
Models
Batteries
H
M
f:
EL
PB-13
5.5
5.5
8
AT:
TH-28A ;
ie
Alkaline
13
15
23 60
Manganese 4
a
ig
23
PB-13
5
5
75
16
TH-48A =
Tiaae
Alkaline
12
14
19
59
Manganese 4
5
7
21
®
6
seconds
transmission,
6
seconds
reception,
48
seconds
reception
with
no
signal
recommended.
AF
output
0.2W/8
ohms.
@ Battery saver function on.
CAUTION
The
display
indicator
flashes
and
the
POWER
switch
will
not
work
when
the
battery
starts
to
go
flat.
When
this
happens,
recharge
or
replace
the
battery.
We
recommend
use
of
the
NiCd
battery
pack
for
long
transmission
or
extended
operation.
Manganese
batteries
(
except
Alkaline
manganese
batteries
)
may
be
used
for
Low
or
EL
position.

RECEIVER OPERATION
1 Getting started
10
Connect the battery pack and the supplied antenna.
Press the POWER switch to turn the transceiver on.
One of the default frequencies should appear on the
display.
TH-28A/E
et meet
(0 0. LLL
a8 8 APO
TH-48A/E
tt. a fee
i. Le
abies
or
t ie mre
it.
LiL
apr
If the display shows incomplete data, or you think the
displayed frequency is wrong, reset the micro-
processor (see page 18 Initializng the Memory).
Rotate the VOL control clockwise until a signal or
noise is heard coming from the speaker.
Rotate the tuning control to selected an open
channel.
Rotate the SQL control clockwise until the noise just
disappears and the BUSY indicator turns off. This
point is known as the Squelch Threshold point.
sel
Most programming procedures mentioned in
| this manual allow a 10 second delay between
steps.
If youwait too long to perform a step the
transceiver will return to the normal frequency
display. If this occurs you will have to begin
the procedure again.