Kenwood TH-75A User manual

GOOMNS>)I
144/440MHz FM DUAL BANDER
TH-/75A
144/430MHz FM DUAL BANDER
TH-75A
144/430MHz FM DUAL BANDER
TH-75E
INSTRUCTION MANUAL
KENWOOD CORPORATION
@©PRINTED IN JAPAN B50-8275-00(K, M, X, W, T, P)(T)
90/12 1110987654321 89/12111098765

CONTENTS
1. BEFORE OPERATION
2. SPECIFICATIONS and ACCESSORIES ..
3. BATTERY PACK
4. OPERATION
OPERATING CONTROLS ...
RECEIVER OPERATION
Reception, Frequency selection,
Frequency step selection, Programable VFO, A.B.C.
TRANSMITTER OPERATION . F015:
MEMORY 216
-oO PWNH
Microprocessor initialization, Memory channel,
Memory contents, Memory entry,
Memory recall, Memory shift
SCAN
Scan operations, Hold/resu g!
Band scan, Programmable band scan,
Memory channel scan, Double memory scan,
Memory channel lockout, Priority alert
REPEATER OPERATION..
Transmitter offset, Reve
Tone and CTCSS operation, ea
TONE ALERT SYSTEM.
BATTERY SAVER.........
AUTOMATIC POWER OFF.
FAST SQUELCH
5. BLOCK DIAGRAM and
SCHEMATIC DIAGRAM ............. another sheet
6. MAINTENANCE ......o..... ee eeeeceeceseeeseeeteeeseeenaee 29
In Case of Difficulty
7. OPTIONAL ACCESSORIES....................::::cccee 31
CTCSS unit TSU-6
1. BEFORE OPERATION
Thank you for purchasing this new transceiver.
IMPORTANT:
Please read this instruction manual carefully before placing
your transceiver in service.
CAUTION:
Long
transmittion
or
extended
operation
in
the
HI
power
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.
SAVE THIS INSTRUCTION MANUAL.
This
Instruction
Manual
covers
the
following
models.
TH-75A
:
144/440
MHz
FM
DUAL
BANDER
with
CTCSS unit.
(U.S.A. and Canadian version)
TH-75A : 144/430 MHz FM DUAL BANDER.
(Other market)
TH-75E : 144/430 MHz FM DUAL BANDER.
(U.K. and European version)
The following explicit definitions apply in this manual:
NOTE : If disregarded, inconvenience only, no risk of
equipment damage or personal injury.
CAUTION:
Equipment
damage
may
occur,
but
not
per-
sonal
injury.

2. SPECIFICATIONS
2-1. SPECIFICATIONS
and ACCESSORIES
2m Band 70 cm Band
TH-76A U.S.A. version 144 to 148 438 to 450
Bae eeR TH-75E European and U.K. version 144 to 146 430 to 440
TH-75A Others 144 to 148 430 to 440
MODE F3E (FM)
MEMORY CHANNELS 10+1 I 10+1
FREQUENCY STEP (kHz) 5, 10, 18, 20, 12.5, 26
ANTENNA IMPEDANCE (0) 50
POWER REQUIREMENT 6.3~ 16 (7.2 VDC nominal)
13.8V Approx. 1.4 A Approx. 1.5 A
i hg HI | 9 V (with BT-6) Approx. 1.2 A Approx. 1.3 A
S| cup. | mode 7.2 V (with PB-5/6/7/9) ‘Approx. 1A Approx. 1.1A
Ser LO transmit mode Approx. 0.6 A Approx. 0.6 A
& DRAIN | Single | RECEIVE mode with no signal_| Approx. 45 mA Approx. 50 mA
band | BATTERY SAVER mode Approx. 12 mA Approx. 13 mA
Dual | RECEIVE mode with no signal Approx. 83 mA
band | BATTERY SAVER mode ‘Approx. 20 mA
AUTOMATIC POWER OFF mode Approx. 3 mA
GROUND Negative
DIMENSIONS _ | Projections not included (mm) 58x 179 29.5 (2.3x 7X 1.2 inch)
(WxHxD) Projections included (mm) 74x 193 x40 (2.9x7.6x 1.6 inch)
WEIGHT (g)___ With NiCd Battery and Antenna | 510 (1.1 Ibs.)
OPERATING TEMPERATURE =20°C~ +50°C (—4°F~122°F)
MICROPHONE IMPEDANCE 2ko
m 13.8V More than 5 W
B] oureur Hi [9 V (with BT-6) ‘Approx. 3 W Approx. 2.5 W
| POWER 7.2 V (with PB-5/6/7/9) Approx. 1.5 W. Approx. 1.5 W.
FA to ‘Approx. 0.5 W
< MODULATION REACTANCE
f | MAXIMUM FREQUENCY DEVIATION (kHz) +5
SPURIOUS RADIATION HI/LO Less than — 60 dB/— 50 dB
CIRCUITRY [DOUBLE CONVERSION SUPERHETERODYNE
INTERMEDIATE | 1st IF (MHz) 16.9 59.525
| FREQUENCY _[ 2nd IF (kHz) 455
5 | SENSITIVITY 12 dB SINAD | Less than 0.16,V | Less than 0.18:V
| SQUELCH SENSITIVITY Less than 0.1 .V
@ -6 dB More than 12 kHz
SELECTIVITY: » anna Less than 28 kHz
AUDIO OUTPUT POWER
(across 8 @ load 10% distortion)
More than 400 mW/at 9 V
NOTES:
1. Circuit and ratings are subject to change without
notice due to advancement in technology.
2. Recommended duty cycle: 1 minute Transmis-
sion, 3 minutes Reception
2-2. ACCESSORIES
Unpack your new transceiver carefully, and exa-
mine it for visible damage. If the equipment has
been damaged in shipment, notify the transporta-
tion company immediately.
Save the boxes and packing material for future
shipping.
The following accessories should have been includ-
ed in the box with the transceiver.
Antenna.... T90-0388-05...1 ea.
Belt Hook J29-0424-04...1 ea.
Hand strap. J69-0312-04...1 ea.
W09-0507-05..1 ea.
NiCd Battery pack (PB-6).
Battery charger
for U.S.A. version (120V)
adesincavesaseuck W09-0382-15
for European version (220V)
inidessauaaee see WO09-0388-05
for U.K. version (240V)....WO9-0387-05
for Oceania version (240V)
WO09-0386-05
WO09-0385-05
for other market (120V).
Instruction Manual ..
Warranty Card....
(U.S.A., Canada, and European version)
B50-8275-XX .1 copy
1 ea.

3. BATTERY PACK
3-1.
NiCd
BATTERY
PACK
(PB-6)
This battery pack has not been charged at the factory in
order to provide you with the greatest number of charge/dis-
charge cycles. You must charge the battery before use. The
battery pack will require several charge/discharge cycles be-
fore 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.
3-2. RECHARGING Msxe”
1. Slide the adapter onto the
NiCd battery pack.
2. Plug the supplied charger
into an AC outlet.
3. 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.
NOTE:
Recharging should be per-
formed within an ambient
temperature range of between
5°C~40°C (41°F ~
104°F).
Recharging the battery out-
side of this range may not al-
low the battery to reach full
charge.
to AC outlet
3-3.
MANGANESE
or
ALKALINE
BAT-
TERIES
(Optional
Battery
Case
BT-6)
Install 6 x R6 (AA) manganese
or alkaline batteries in the bat- Press down on the hook in the
tery
holder.
Pay
close
atten-
‘Middle
of
the
battery
case
top
* ty to open.
tion the battery polarities
marked in the holder. We Hook
recommend the use of high |
performance manganese bat-
teries for the greatest operat-
ing time.
NOTE: ——________
Do not install NiCd batteries
and attempt to charge them
with the supplied charger.
There is no battery protection
circuit in the battery holder.
3-4.
INSTALLING
THE
BATTERY
PACK
Align the grooves in the bat- Release button
tery pack with the transceiver >
and slide the pack to the right
until it locks in place.
To remove the battery pack
push up on the release button
and slide the pack to the left.

3-5. BATTERY VOLTAGE LEVEL METER
The S meter indicates the rela-
tive battery voltage during Manganese or Alkaline
transmit. a
b
Recharge or replace the bat- mitexies
teries when the level reaches New myeeg te
batteries replace
the low indicator.
7
|
Approximate battery condition
NiCd Battery pack
model mAh Vv Fully charged Fully discharged
ageret "ag Ae
PB-6 600
peg | 600 | 72 ”
PB-7 1100 Zz
=f
F
pp-8 | 600 | 12 =A
z
3-6. OPERATING TIME
TH-75
series
Transmitting.
Receiving
..
ti
AF
OUTPUT...
Nica
* Battery voltage is mea:
600
transmission (Hi).
battery 1
2v
12 mAh (PB-8)
10 | NiCd battery
7.2V 200 mAh
(PB-5)
NiCd battery 7.2 V 600 mAh (PB-6)
NiCd battery 7.2 V
1100 mAh (PB-7)
Lower limit voltage range for transmission
6
4 | Mengansese — Manganese battery ‘AA Alkaline manganese
battery (BT-6) _(Low-Power)(BT-6) battery (BT-6)
2
° ens
60 120 180 240 300 (minutes)
We recommend use of the NiCd battery pack for long trans-
mission or extended operation.
Manganese battery (except Alkaline manganese battery) is
suitable only for LOW power transmission.

4. OPERATION
4-1.
OPERATING
CONTROLS
© Antenna connector
Connect
the
antenna
that
is
supplied
to
this
jack.
Twist
to lock.
@ HI-LO switch
This
switch
is
used
to
select
the
transmit
output
power.
@ MIC jack
This
jack
is
used
for
connection
of
an
external
micro-
phone.
The
use
of
an
electret
type
microphone
is
recom-
mended.
Input
impedance
is
2
kQ
and
the
DC
voltage
on
this
ter-
minal is approximately 4 V (max. 3.5 mA).
NOTE:
The
use
of
a
dynamic
microphone
is
not
recommended.
Speaker
sP
Ground
th
5V
MIC
MIC
PTT
PET:
@ Speaker jack
This
jack
is
used
to
connect
an
external
speaker
or
ear-
phone.
The
recommended
impedance
is
8
Q.
© VHF SOL control
This
control
is
used
to
select
the
desired
SOL
threshold
level of the VHF frequency band.
© VOL control/Power switch
The
volume
control
and
power
switch
are
combined.
Rotating
the
control
clockwise
will
turn
ON
the
tran-
sceiver.
Advancing
the
control
further
clockwise
will
in-
crease
the
volume
of
both
bands.
The
BAL
control
proportions
the
volume
among
the
two
bands.
@ UHF SOL control
This
control
is
used
to
select
the
desired
SQL
threshold
level of the UHF frequency band.
BALANCE control
This
control
proportions
the
total
audio
volume
among
the two bands.
MAIN
position
Audio
only
from
the
MAIN
band
Center
position
Equal
audio
from
both
bands
SUB
position
Audio
only
from
the
SUB
band
© Tuning control
This
control
is
used
to
select
the
desired
transmit-
ter/receiver
frequency,
memory
channel,
frequency
step,
tone
frequency,
and
scan
direction.

@ F key
This key is used to activate control of the functions print-
ed above the various front panel controls. The ‘’F’’ indi-
cator will turn ON for approximately 10 seconds. You
must press the desired 2nd function key before the indi-
cator turns off.
@ TONE/T.SEL key
This key is used to activate the subaudible tone encorder.
Pressing the key within 10 seconds of pressing the F key
will switch to the tone frequency selection mode.
The Tuning control can then be used to select the desired
tone frequency.
@ SHIFT/REV key
This key is used to select the desired transmitter offset
direction. Pressing the key will cause the radio to shift
from one offset direction to the other, i.e. + to — to sim-
plex where no indicator showes. [— to — — for Europe-
an version (UHF band)].
Pressing the key within 10 seconds of pressing the F key
will reverse the transmit/receive frequencise during
repeater operations. If you have selected simplex this key
will not function.
@ UP/DWN (Sub tuning) keys
These keys are used to select the desired SUB band
receive frequency or Memory channel.
Pressing the UP key within 10 seconds of pressing the
M key will enter the upper limit for the programmable VFO
tuning limit function. Pressing the DWN key within 10
seconds of pressing the M key will enter the lower limit
for the programmable VFO tuning limit function.
© M/TX.S key
This key and numeric key are used to store the displayed
data into memory.
Pressing the key within 10 seconds of pressing the F key
will turn the TX.STOP function ON and OFF.
ENT/K.LOCK key
In the VFO mode this key is used to switch to the direct
keyboard frequency entry mode.
In the MR or CALL channel mode this key is used to trans-
fer the contents of the channel to the VFO mode (Memory
shift).
Pressing the key within 10 seconds of pressing the F key
will deactivate all functions except the PTT, MONI,
LAMP, F then LOCK keys.
@ SCAN/DMS key
This key is used to start or stop scanning.
Pressing the key within 10 seconds of pressing the F key
will start or stop Double Memory Scanning.
CALL key
This key is used to activate the Call channel function.
@ MICROPHONE

@
BAND/A.B.C.
(Automatic
Band
Change)
key
This
key
is
used
to
exchange
the
contents
of
the
MAIN
and
SUB
band.
When
this
key
is
pressed
within
10
seconds
of
pressing
the
F
key,
the
contents
of
the
SUB
band
will
be
trans-
fered
to
the
MAIN
band
whenever
a
signal
is
received
at
the
SUB
band,
which
is
strong
enough
to
open
the
squelch.
The
contents
of
the
MAIN
band
are
transfered
to
the
SUB
band
at
the
same
time.
@ MHz/STEP key
This
key
is
used
to
tell
the
microprocessor
that
you
wish
to
increase
or
decrease
the
operating
frequency
in
1
MHz
increments.
During
VFO
operation
pressing
the
key
within
10
seconds
of
pressing
the
F
key
will
switch
to
the
frequency
step
selection
mode.
@ DUAL/DUP key
This
key
is
used
to
turn
the
SUB
band
ON
or
OFF.
Pressing
the
key
within
10
seconds
of
pressing
the
F
key
will
cause
the
duplex
function
to
activate.
@ 1/AL key
This
key
is
used
to
turn
memory
channel
1
ON
or
OFF.
Pressing
the
key
within
10
seconds
of
pressing
the
ENT
key will enter number 1.
Pressing
the
key
within
10
seconds
of
pressing
the
F
key
will
check
Memory
Channel
1
at
approx.
5
second
inter-
vals.
If
the
channel
is
busy,
a
beep
will
sound.
© 2/T.ALT key
This
key
is
used
to
turn
memory
channel
2
ON
or
OFF.
Pressing
the
key
within
10
seconds
of
pressing
the
ENT
key will enter number 2.
Pressing
the
key
within
10
seconds
of
pressing
the
F
key
will
turn
the
Tone
Alert
function
ON
or
OFF.
3/CTCSS key
This
key
is
used
to
turn
memory
channel
3
ON
or
OFF.
Pressing
the
key
within
10
seconds
of
pressing
the
ENT
key will enter number 3.
Pressing
the
key
within
10
seconds
of
pressing
the
F
key
will
turn
the
CTCSS
function
ON
or
OFF.
@ 4/TO/CO keys
This
key
is
used
to
turn
memory
channel
4
ON
or
OFF.
Pressing
the
key
within
10
seconds
of
pressing
the
ENT
key will enter number 4.
Pressing
the
key
within
10
seconds
of
pressing
the
F
key
will
toggle
the
hold/resume
mode
alternately
from
Time
Operated
scan
to
Carrier
Operated
scan.

5/BEEP key
This key is used to turn memory channel 5 ON or OFF.
Pressing the key within 10 seconds of pressing the ENT
key will enter number 5.
Pressing the key within 10 seconds of pressing the F key
will turn the audio confirmation beep ON or OFF.
© 6/CT V/U key
This key is used to turn memory channel 6 ON or OFF.
Pressing the key within 10 seconds of pressing the ENT
key will enter number 6.
Pressing the key within 10 seconds of pressing the F key
will switch the CTCSS function alternately between the
VHF band and UHF band.
TISAVE key
This key is used to turn memory channel 7 ON or OFF.
Pressing the key within 10 seconds of pressing the ENT
key will enter number 7.
Pressing the key within 10 seconds of pressing the F key
will turn the Battery Saver function ON or OFF.
@ 8/APO key
This key is used to turn memory channel 8 ON or OFF.
Pressing the key within 10 seconds of pressing the ENT
key will enter number 8.
Pressing the key within 10 seconds of pressing the F key
will turn the Automatic Power OFF function ON or OFF.
@ 9/LOCK key
This key is used to turn memory channel 9 ON or OFF.
Pressing the key within 10 seconds of pressing the ENT
key will enter number 9.
Pressing the key within 10 seconds of pressing the F key
will deactivate the Tuning control and all functions ex-
cept the PTT, MONI, LAMP, and F then K.LOCK keys.
@ O/L.OUT key
This key is used to turn memory channel O ON or OFF.
Pressing the key within 10 seconds of pressing the ENT
key will enter number 0.
Pressing the key within 10 seconds of pressing the F key
will turn the memory channel lock out function ON or
OFF.
MONITOR switch
When operating in the CTCSS mode you
can use this key to determine if the fre-
quency is in use before transmitting.
Pressing the key will disable the CTCSS
function as long as the key is held
® depressed.
@ Lamp switch
This switch is used to control the night
lamp on the display. The lamp will turn it-
self off automatically 5 seconds after the
last key operation.
PTT switch
Press this switch whenever you wish to
transmit.
@ Release button
Press this button up to release the battery
pack.

DC IN terminal
This terminal is used for an external pow-
er supply. Input voltage is 13.8 VDC
nominal. The center is the + side and the
sleeve is — side.
CAUTION:
You should turn the power switch OFF
when connecting this terminal. Pay close
attention to the polarity.
As a precaution, do not remove the bat-
tery pack when an external power supply
is used.
Use the KENWOOD PG-2V or PG-3E op-
tional cable for the connection.
ee
R
iis
STOP
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AIR
LOCK
=cm aa
298 B99 92 ‘ORRSER
®
@
cota
Lee
“EEE
[E>
SAVE
APO
©
©
Ob860
©
@g
Displays
the
selected
transmitter
offset
-+
direction.
@R
ON
when
the
Reverse
function
is
active.
@TX.STOP
ON
when
the
TX.STOP
function
is
active.
@K.LOCK
—_
ON
when
the
K.LOCK
function
is
active.
LOCK
ON
when
the
LOCK
function
is
active.
© RE
ON during transmit.
ON
when
the
Tone
Alert
System
is
active.
The
indicator
will
flash
when
a
signal
is
received.
This
level
meter
indicates
the
relative
receive
input
strength or
battery
voltage
level
during
transmit.”
c ON when the SUB band frequency dis-
plays CALL channel.
@
M
ON
when
the
SUB
band
frequency
dis-
plays a memory channel.
CTCSS
ON
when
the
CTCSS
function
is
active.
O Ve
-U
Displays the selected CTCSS band.
®
Displays
the
operating
frequency
to
the
886.888.
nearest
kHz,
the
frequency
step
size,
or
the
tone
frequency
of
the
MAIN
band.
ON
when
the
Fast
Squelch
function
is
active.
Flashes when Scanning.
®
ON
when
the
Tone
function
is
active.
(©)
ON
when
the
Priority
Alert
system
is
active.
®
Co
ON
when
Carrier
Operated
scan
is
selected.
ON during duplex operations.
(0)
ON
when
the
A.B.C.
(Automatic
Band
Change)
function
is
active.
M
ON
when
the
MAIN
band
frequency
dis-
plays
a
memory
channel.

OR Busy |
op
@ SAVE
@ APO
®@
© 888.888.
Displays the current Memory Channel
number or Call channel ‘’C’’ indicator. The
star indicator is ON when the Memory
channel will be skipped during Memory
Channel Scan.
ON when the MAIN squelch is open.
ON when the SUB squelch is open.
ON when the BATTERY SAVER function
is active.
ON when the AUTOMATIC POWER OFF
function is active.
ON whenever the F key is depressed.
Displays the operating frequency of the
SUB band.
Flashes when Scanning.
4-2. RECEIVER OPERATION
4-2-1. Reception
1. Turn ON the Power Switch. The display should indicate
frequency. Fig. 1 shows examples of frequencies that
might appear on the various models.
430.888 ition |
TH-75A U.S.A. version TH-75A other market TH-75E
Fig. 1
. Set the BAL control to the MAIN position.
. Rotate the VOL control clockwise until a UHF signal or
noise is heard.
. Rotate the Tuning control to select an open channel.
. Then rotate the U SQL control clockwise until the noise
disappears and the BUSY indicator goes OFF (Threshold
point).
. Rotate the Tuning control to select the desired fre-
quency.
7. Press the BAND key to exchange bands.
8. Rotate the Tuning control to select an open channel.
9. Then rotate the V SQL control clockwise until the noise
t0)
fi
| |.008 sage
| lee 800 su000
ames)
af WN
fo.)
disappears and the BUSY indicator goes OFF.
. Rotate the Tuning control to select the desired fre-
quency.

Dual band reception (Simultanious reception on both bands)
11. When a signal is received, the BUSY or the B indicator
will turn ON.
12. To proportion volume between the MAIN band and SUB
band, rotate the BAL control to the desired point. The
VOL control regulates the amount volume of two bands.
Single band reception
Press the DUAL key. The SUB band frequency display will
turn off.
4-2-2. Frequency Selection
You can change the dial frequency of the MAIN band while
in the VFO mode.
The frequencies can then also be stored in Memory or in
the Call channel using the techniques that will be described
in this manual.
To select the other band press the BAND key momentarily.
MAIN BAND
@ VFO MODE
® Direct keyboard frequency
entry
1. Press the ENT key to select
the ENTER mode.
(U.S.A. version)
12
2.
Within
10
seconds
of
pressing
the
ENT
key
enter
the
fre-
quency
to
the
nearest
kHz.
For
example
U.S.A. version: OG@GEAaD
Other version: COGAG)
The
receiver
will
not
change
frequency
until
all
digits
have
been
entered.
If
you
should
make
an
error
before
entering
all
digits,
press
the
ENT
key
twice,
and
reenter
all
digits.
© Tuning control frequency selection
Rotate
the
Tuning
control
to
select
the
desired
frequency.
@ MEMORY RECALL MODE
© Direct keyboard memory recall
1.
Simply
press
the
desired
memory
channel
key
and
the
radio
will
switch
to
the
channel
frequency.
2.
To
return
to
the
original
operating
frequency,
press
the
same
memory
channel
key
again.
®@ Tuning control memory recall
After
the
direct
keyboard
memory
recall
you
can
rotate
the
Tuning
control
to
select
the
desired
memory
channel.

@ CALL CHANNEL MODE
.
Press
the
CALL
key
to
select
the
CALL
Channel
mode.
The
CALL
indicator
and
the
call
channel
frequency
are
displayed
on
the
display.
2.
To
return
to
the
previous
mode
press
the
CALL
key
again.
=
SUB BAND
It
is
impossible
to
change
the
mode
directly
in
the
SUB
band.
© If the current frequency is in VFO mode:
You
can
press
the
UP/DWN
keys
to
select
the
disired
fre-
quency of the SUB band.
©
If
the
current
frequency
is
in
MR
mode:
You
can
press
the
UP/DWN
keys
to
select
the
desired
memory
channel
of
the
SUB
band.
(The
Channel
num-
ber
is
not
displayed.)
©
Current
frequency
is
in
CALL
Channel
mode:
The
Call
channel
frequency
can
not
be
changed
in
the
SUB
band.
4-2-3. FREQUENCY STEP SELECTION
The
frequency
step
as
delivered
from
the
factory
is
illus-
trated
below:
MAIN BAND
Lip
Press the F key. The F in-
dicator should light in the
display.
. Press the MHz/STEP key
within 10 seconds of
pressing the F key. The
current frequency step size
will be displayed.
. Rotate the Tuning control
until the desired tuning
step size appears in the
display.
. To complete the program-
ming of the step size you
can press any key on the
front panel, or simply wait
10 seconds and the
microprocessor will auto-
matically return to the nor-
mal frequency display.
SUB BAND
TH-75A TH-75E
144 MHz Band 5 kHz 12.5 kHz
430/440
MHz
Band
25kHz
|
25
kHz
To
select
the
desired
tuning
or
scan
step
size
use
the
fol-
lowing
procedures:
The accompanying figure shows
how the Tuning control will in-
crease or decrease the step size.
§ 15 C8 ie 2S
Leer ai corset |
It is not possible to select the Frequency Step directly while
in the SUB Band. Change to the MAIN band if you want to
alter the step size. Then return to the SUB band.
13

4-2-4. PROGRAMMABLE VFO TUNING LIMIT
This
transceiver
provides
the
capability
of
programming
the
VFO
tuning
range,
in
1
MHz
band
segments,
as
well
as
providing
a
separate
programmable
band
scan
function
(See
section
4-5).
For
example
you
could
tell
the
transceiver
that
you
only
wish
to
tune
the
144.000
MHz
and
145.000
MHz
band
segments
by
specifying
any
frequency
with
these
two
segments.
The
tuning
controls
would
then
only
tune
within
these
specific
bands.
The
procedure
for
specifying
the
bands
is
described
below.
1. Select the desired lower
tuning range.
For example you might
want to select the
144 MHz band, and enter
144.100 MHz.
2. Press the M key. The M in-
dicator should light in the co
display.
3. Press the V key within 10
seconds of pressing the M ww)
key. The M indicator will
turn off. This indicates that
the lower limit has been
successfully stored in
memory.
4. Now select the desired up-
per tuning limit using the
MHz key or tuning control.
ti
4. iad
14
With our example we
want the upper band limit
to be in the 145 MHz
band, and therefore dial
up 145.100 MHz.
. Press the M key. The M in-
dicator should light in the
display.
. Press the A key within 10
seconds of pressing the M
key. The M indicator will
turn off. This indicates that
the upper limit has been
successfully stored in
memory.
-To confirm that the
programming was proper-
ly performed rotate the
tuning control. The tran-
sceiver should not go
above or below the
programmed band limits.
su
mn
45.188 = yyaene
SAVE APO
(4)
> deg
—> 45.995
.
To
clear
both
programmed
limits
simultaneously
you
should
initialize
the
VFO
memory
using
the
following
procedures.
VFO RESET
(1) Turn the Power switch off.
(2) Press and hold the ENT key and turn on the power
switch.
(3) Release the ENT key.
You
can
reprogram
either
limit
independently
by
follow-
ing
the
appropriate
instructions
above.

4-2-5. A.B.C. (AUTOMATIC BAND CHANGE)
The A.B.C. function allows you to exchange the contents
of SUB band to the MAIN band automatically whenever a
signal is received in the SUB band and SUB squelch is open.
Pressing the PTT switch release the A.B.C. function.
1. Press the A.B.C. key within
10 seconds of pressing the co
F key. The A.B.C. indicator —
will turn on in the display.
yu] ann
pen eyert)
[2c]
2. As soon as a signal is
received in the SUB band,
bands exchange occurs.
The Tuning control are not
effective during this ex-
change.
nnn
M4UGG — yaooe
If the PTT switch is not
Pressing the PTT switch
releases the A.B.C.
function.
pressed within 3 seconds
after the signal goes off,
the MAIN band will be re-
stored to its original fre-
quency.
| | W002 F4yQ000
SAVE APO
yu} nnn tay Ann
UUs iu
[52] SAVE APO
4-3. TRANSMITTER OPERATION
CAUTION:
1. Ensure that an antenna with a low standing wave ratio
(SWR) is attached to the antenna connector before at-
tempting to transmit. Failure to provide proper termina-
tion may result in damage to the final amplifier section.
2. Always check to ensure the frequency is clear before
transmitting.
TRANSMIT
1. Select the desired operating frequency in the MAIN band
using any of the methods previously discussed.
2. Check the frequency to see if it is occupied before you
transmit.
3. Press the PTT switch. The ON AIR indicator will light,
and the RF meter will light.
4. Speak into the microphone. The recommended distance
to the microphone is 5 cm (2 inches).
NOTE:
Talking closer may result in overdeviation of your trans-
mit signal, which might be reported as a loss of clarity
or an excessively wide transmit signal.
Talking too far away may result in reports of weak audio.
5. Release the PTT switch to return to the receive mode.
The ON AIR indicator should go out, and the RF meter
will return to zero.
15

DUPLEX OPERATION
During
duplex
operation
pushing
the
PTT
switch
allows
the
simultaneous
reception
on
the
SUB
band
while
you
trans-
mitting
on
the
MAIN
band.
NOTE:
Receiver
sensitivity
may
be
suppressed
with
certain
com-
bination of transmit and receive frequencies.
Use of earphone causes no howling.
4-4. MEMORY
4-4-1.
MICROPROCESSOR
MEMORY
BACK-UP
A
lithium
battery
is
contained
in
the
transceiver
to
retain
memory.
Turning
off
the
POWER
switch,
or
a
power
failure
will
not
erase
the
memory.
The
battery
should
last
for
approximately
five
years.
When
the
battery
discharges,
an
erroneous
display
may
ap-
pear
in
the
display.
Lithium
battery
replacement
should
be
performed
by
an
authorized
KENWOOD
service
facility;
either
your
KENWOOD
dealer,
or
the
factory,
since
this
unit
contains
CMOS
type
circuitry.
4-4-2.
MICROPROCESSOR
INITIALIZATION
The
Initial
state
of
the
microprocessor
as
delivered
from
the
factory
is
shown
in
the
chart
below.
UHF BAND
VHF BAND| TH-75A
U.S.A./Canada
TH-75A/E
VFO and Memory
Channel frequency
Frequency
step
|
5
kHz
25
kHz
25
kHz
Tone
frequency
|
*(88.5
Hz)|
88.5
Hz
|
*(88.5
Hz)
*
Only
when
CTCSS
unit
is
installed.
144
MHz
|
440
MHz
|
430
MHz
Microprocessor Initialization
When
you
want
to
erase
all
programed
data,
or
if
the
dis-
play
should
show
erroneous
information,
you
should
initialize
(reset)
the
microprocessor
using
the
following
procedure.

1. Turn the POWER switch off.
2. Press and hold the M key and turn on the POWER switch.
3. Release the M key.
4-4-3. MEMORY CHANNEL
This transceiver provides 10 Memory Channels for the VHF
band and another 10 Memory Channels for the UHF band.
In addition to serving as a normal Memory Channel some
of the Memory Channels serve a dual purpose to specify
other parameters. The functions of these Memory Channels
are described below.
* Memory Channel 1 is used to store the frequency for the
Priority Alert function.
* Memory Channel 8 is used to store the lower limit for
the Programable Band Scan
function.
* Memory Channel 9 is used to store the upper limit for the
Programable Band Scan function.
* Memory Channel 0,1, and 2 are used to store odd split
repeater data information.
4-4-4, MEMORY CONTENTS
Each Memory channel is capable of storing the following
information.
Memory channel |} Set ot aed
Frequency data fe) {e) (2)
Tone frequency data ie) N/A L {e}
CTCSS, Tone ON/OFF
(except 1750 Hs) ° NIA ©
SHIFT status N/A {e)
REVERSE ON/OFF N/A {e)
4-4-5. MEMORY ENTRY
Memory entry must be done from the MAIN band.
pr erm shift
. Select the desired operat- ri nn
ing frequency, offset, tone 45 6
frequency, etc. (For exam-
ple 145.600 MHz)
2. Press the Mkey. TheMin- (74
dicator will light. nn ais
45.600 " 0008
SAVE APO
3. Press the desired Memory Cs)
Channel number using the
numeric
keypad.
eee
(For
example
CH5)
-u
The
M
indicator
and
the
46.60a
qyaong
Memory
Channel
number
|(|
stv
ar)
will turn OFF.
i Split Channels
. Select the desired receive =
frequency, tone frequency, an
Tone on etc. (For example 145.600 WEEE
145.600 MHz Tone on) = —_____***e_}
2. Press the M key and then
Press the desired Odd Split
Channel number using the ces
numeric key. cr)
(For example CH1)
17

. You should, select the
desired transmit frequen-
cy using the Tuning con-
trol. (For example
145.700 MHz)
Channel number key you
pressed in step 2.
. To confirm the contents of
the Odd Split Memory
Channel press the Odd
Split Channel key. The
receiving frequency and
the — + indicator will ap-
42.
ann
(ues
su
E.8Eo
save APO
CALL CHANNEL
4;
Select the desired operat-
ing frequency, offset, tone
frequency, etc. (For exam-
ple 146.100 MHz).
into memory. The M indi-
cator will turn OFF to con-
firm data entry.
146.
a
nn
ju
su
EEE
save APO
4-4-6. MEMORY CHANNEL RECALL
Please refer to Frequency Selection page 12.
2. Press the M key. The M in-
.
Press
the
M
key.
cy
dicator
will
turn
on.
.
Within
10
seconds
of
;
a
mn
pressing
M
key
press
and
OO
3.
Press
the
CALL
key
within
46.
iGg
«
Weaad
hold
the
PTT
switch
and
exe)
10
seconds
of
pressing
the
a
aeeey.
press
the
same
Odd
Split
OO
M
key
to
enter
the
data
pear
in
the
display.
4-4-7.
MEMORY
SHIFT
Using this function you can copy the contents of a Memory
Channel or Call channel to the VFO without changing the
data in memory.
This will allow you to change the tone data, or tune nor-
mally if wish.
. To check the transmit fre-
quency press the F key and
then REV key, or the PTT
switch. The transmitting
frequency will appear in
the display. 45.78

1. In the Memory channel
mode or CALL channel | |- nanan 7
mode press the ENT key. | |Y4u.uuu 5 (45207
The display will indicate (UE APO
the ENTER mode frequen-
cy status, 2
2. Within 10 seconds of
pressing the ENT key, ro-
tate the tuning control to | | 4- 7.7 ~~ 45.888
=u
the desired frequency. The \ eaten]
Memory Channel or CALL
Channel indicator will turn
OFF to signal the data has
been successfully trans- | |_ oH
VFO. nan
fered Seen wo.guU 45.008
SAVE APO
NOTE:
1. If you do not need to change the frequency after shift-
ing the Memory contents to the VFO simply press the
ENT key twice.
2. If an Odd Split Memory channel is selected, only the
receive data will be copied.
4-5. SCAN
4-5-1. SCAN OPTIONS
The following scan options are available:
Band scan
Scan proceeds over the entire main band. This func-
tion operates in the VFO mode only.
Programable Band scan
The scan range in this mode is specified in main band
memory channel 8 and 9. This function operates in
the VFO mode only.
Memory Channel Scan
Scan proceeds thru those main band memory chan-
nels that have data stored and have not been locked
out.
This function operates in the Memory Channel mode
only.
Double Memory Scan
Scan proceeds thru all sub memory channels that have
data stored and have not been locked out simultane-
ously with main memory channels. This function oper-
ates in the both Memory Channel modes only.
Scan will not function when the Tone Alert System is active.
4-5-2. HOLD/RESUME PROGRAMMING
Two type of scan hold/resume have been provided in this
transceiver.
Time Operate scan (TO)
You may prefer that the radio stops on a busy chan-
nel and remains there approximately 5 seconds, and
then continues to scan even if the signal is still
present.
19

Carrier Operated scan (CO)
In this mode the radio will stop scanning on a busy
channel and remain there until the signal drops out.
The radio allows a 2 second delay before it resumes
scanning so that you don’t loose the station when
operators change.
During CTCSS operation scan will not stop until the same
tone is received.
This transceiver is delivered from the factory in the Time
Operated scan mode. To switch between the two modes
use the following procedure.
1. Press the F key. The F indicator will light.
2. Press the 4/TO/CO key within 10 seconds of pressing
the F key. This will toggle the Hold/Resume mode to Car-
tier operated mode. The CO indicator will light.
3. To return to Time operated mode repeat steps 1 and 2.
4-5-3. BAND SCAN
1. Adjust the SQL control to =)
the threshold point. Su
2. Press the SCAN/DMS key. h nn n
The MHz indicator will be- 45,600 433.528
gin flashing to signal the =
transceiver is scanning. Flashing
3. Scan will begin in an upward direction.
You can reverse the direction of scan by rotating the Tun-
ing control clockwise.
The tuning step size depends upon the current step
selection.
4. Scan will stop whenever a signal is received that will open
the squelch of the radio.
5. You can cancel scan with PTT switch and any front panel
key except the AV keys.
20
4-5-4. PROGRAMMABLE BAND SCAN
1. The lower scan limit must be stored in Memory Channel
8.
The higher scan limit must be stored in Memory Chan-
nel 9.
CAUTION:
If the frequency and the frequency step in Memory Chan-
nel 8 is equal to or greater than the frequency and the
frequency step in Memory channel 9 scan will proceed
over the entire tuning range of the set, i.e. it will func-
tion like the Band Scan previously described.
2. Adjust the SQL control to the threshold point.
Select a frequency between the two programmed scan
limit.
3. Press the SCAN/DMS key. The MHz indicator will begin
flashing to signal the transceiver is scanning.
4. Scan will begin in an upward direction.
You can reverse the direction of scan by rotating the Tun-
ing conrol clockwise.
The tuning step size depends upon the current step
selection.
5. Scan will stop whenever a signal is received that will open
the squelch of the radio.
6. You can cancel scan with PTT switch and any front panel
key except the A\V keys.