Kenwood TH-77A User manual

GOO/ANAD
144/430MHz FM DUAL BANDER
144/440MHz FM DUAL BANDER
TH-77A
144/430MHz FM DUAL BANDER
TH-77E
INSTRUCTION MANUAL
KENWOOD CORPORATION
©PRINTED IN JAPAN B62-0007-10(A,T)(K,P,T)
922 1110987654321 9112111098765

FCC WARNING
This equipment may generate or use 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.
Press the
power
switch for
longer than
0.1 second
to turn the
transceiver
on or off.
CAUTION
During fixed station operation, the supplied antenna may cause
interference to nearby electronic equipment. It can also increase
the supply voltage from an external D.C. power supply. To avoid
these conditions, a low gain external antenna can be used. A gain
type antenna can lead to intermodulation distortion.
2

CONTENTS
1. BEFORE OPERATION
2. SPECIFICATIONS and ACCESSORIES
3. BATTERY PACK
4. OPERATION
44
4-2 RECEIVER OPERATION
4-3 TRANSMITTER OPERATION
4-4
4-5 SCAN
OPERATING CONTROLS ............
Receiver Operation
Frequency Selection
Frequency Step Selection
Programmable VFO Tuning Limits
A.B.C.( Automatic Band Change )
UXU(430MHz Band Simultaneous Reception)
MEMORY
Microprocessor Memory Back-up
Microprocessor Initialization | Memory
Channel Memory Contents Memory Entry
Memory Channel Recall Memory Shift
Memory Recall when the Keyboard Cover is
Installed
Scan Options Hold/Resume Programming
Band Scan Programmable Band Scan MHz
Scan Memory Channel Scan VFO/Memory
Channel Scan Call Scan
V/M/C (VFO/ Memory /Call) Scan Memory
Channel Lockout Priority Alert Function
4-10
4-11
4-12
6. MAINTENANCE
7. OPTIONAL ACCESSORIES
REPEATER OPERATION: steer, cprtee geen een
Transmitter Offsets Reverse Function Tone
and CTCSS Operation Autopatch Operations
DTMF MEMORY FUNCTION
DTSS
DTSS Code DTSS Code Selection Using the
DTSS Function Using DTSS with a Repeater
PAGING
Paging Code Memories Setting the Paging
Code Paging Transmission (Calling) Paging
Reception (Wait) Code Lockout
TONE ALERT SYSTEM
BATTERY SAVER
AUTOMATIC POWER OFF
5. BLOCK DIAGRAM and SCHEMATIC DIAGRAM
another sheet
In Case of Difficulty
4
49

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 transmission 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.
SAVE THIS INSTRUCTIGN MANUAL.
2. SPECIFICATIONS and ACCESSORIES
2-1. SPECIFICATIONS
440/430MHz
band
GENERAL 144MHz band
U.S.A. Version 144 to 148 438 to 450
FREQUENCY
RANGE (MHz)
144 to 146 430 to 440
430 to 440
or 438 to 450
F3E (FM)
502
— 20°C ~ + 60°C (— 4°F~ 140°F)
7.2 V ~ 16 VDC (13.8 VDC)
6.3 V ~ 16 VDC (7.2VDC)
U.K.and Europe
144 to 148
Other market
MODE
ANTENNA IMPEDANCE
OPERATING TEMPERATURE
POWER aS IN (nominal)
REQUIREMENTS |" BatTERy PACK
This Instruction Manual covers the following models:
TH-77A : 144/440 MHz FM DUAL BANDER with
CTCSS unit. (U.S.A.and Canadian version)
TH-77A : 144/430 MHz FM DUAL BANDER.
Yotnei maMedy
TH-77E: 144/430MHz FM DUAL BANDER.
(U.K.and European version)
The following explicit definitions apply in this manual:
OTE If disregarded, inconvenience only, no risk of equip-
ment damage or personal injury.
CAUTION Equipment damage may occur, but not personal in-
jury.
CURRENT DRAIN
13.8VDC (Ext.Power Supply) H
7.2VDC (Battery) H
Transmit mode L
SIMPLEX
Receive mode with no sianal
SIMPLEX Battery Save mode
DUPLEX
Receive mode with no signal
Approx. 1.5A | Approx. 1.6A
Approx. 1A Approx. 1A
Approx. 0.5A | Approx. 0.54
Agorox. 60mAAgarax. 65.A
Approx. 18mA]Approx. 20mA
Approx. Approx.
120mA 120mA
Battery Save mode |Approx. 30mA/Approx. 30mA
DUPLEX
GROUND
DIMENSION (W xH x D)
Negative
58x 140.5 x 29.5 mm

DIMENSION ( Projection Included ) 68.5 x 154.5 x39mm
MICROPHONE INPEDANCE
TRANSMITTER
H (13.8VDC)
more than 5W
OUTPUT
ek H (7.2VDC) Approx. 1.5W
Approx. 0.5W
MODULATION
MAXIMUM FREQUENCY DEVIATION
SPURIOUS RADIATION
RECEIVER
Reactance
+ SkHz
less than — 60dB
double conversion super-
SIREOURY: heterodyne
INTERMEDIATE FREQUENCY 1STIF | 45.05MHz
INTERMEDIATE FREQUENCY 2 ND IF
less than
- 16dBy
(0.16pV)
UxU MODE ;
less than
-11dBh
(0.28pV)
SQUELCH SENSITIVITY less than — 20dBy(0.1pV)
SELECTIVITY -—6dB more than 12kHz
SELECTIVITY -—60dB less than 24kHz
AUDIO OUTPUT POWER More than 200 mw
(10% distortion) (across 8Q load )
NOTES: 1. Circuit and ratings are subject to change without notice,
due to development in technology.
2. Recommended duty cycle : 1 minute Transmission, 3
minutes Reception
less than
-15dBp
(0.18pV)
SENSITIVITY (12dB SINAD)
2-2. ACCESSORIES
Unpack your new transceiver carefully and examine it for
visible damage. If the equipment has been damaged in
shipment, notify the transportation company immediately.
Save the boxes and packing material for future shipping.
The following accessories should have been included in
the box with the transceiver:
AGHOBDE fo cate oe ae ewe sa T90-0414-XX 4
Belt Maat... Ge. eae J29-0424-XX 1
FANGS EA 0 coco: cy «heen J69-0312-XX 1
Keyboard Cover .......... FO7-1202-XX 1
Bottom:Govery css siejecjaa.s FO7-0896-XX 1
MEESTER 90K coma. ste ies ONE 1
(PB-6) for U.S.A. and Canada W09-0507-XX
(PB-10) for other market ..... WO09-0535-XX
Battery CHatge rr a. a. a a ono ae MIRE ous 1
(BC-9)
for. U-S.AsG20V) .) ack. W09-0382-XX
for Canada (120V) ........ W09-0385-XX
(BC-2)
for Europe (220V) ........ W09-0317-XX
POF LK. (PAOW os oS. aces W09-0318-XX
for Oceania (240V) ....... W09-0527-XX
(BC-12)
for other market (120/240V) W09-0534-XX
AC plug (M type only) ..... E19-0254-xX .. 1
Instruction Manual ....... B62-0007-XX .. 1
Warranty Card (U.S.A., Canada, and Europe) .. 1

3. BATTERY PACK
MNi-Cd BATTERY PACK(PB-10)
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 require several
charge / discharge cycles before you can expect to see
the maximum operating period between charges. If the
battery will be stored for longer than 2 months it
should be recharged before use.
m@ RECHARGING
CAUTION (for general market only)
The BC-12 has a voltage selection switch ( 120V /
230V). Make certain that the switch setting matches
the AC line voltage.
1. Interconnect the adapter to the NiCd battery pack.
2. Plug the battery 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:
Voltage selection switch
for general
market only
NiCd battery pack
NOTE
Recharging should be done within an ambient
temperature between 5°C ~ 40°C (41°F ~ 104°F).
Recharging performed out of this range may not
fully charge the battery.
HEMANGANESE or ALKALINE ria ab 6)
Load 6 xX R6 (AA) manganese or
alkaline batteries in series in the
optional battery case(BT-6). (Be
sure to observe the polarities.) //;
We recommend the use of high (==
perfomance manganese batteries.
Press down on the hook in the
middle of the battery case top
to open.
CAUTION
Do not install NiCd batteries and attempt to charge
them with the supplied charger. There is no battery
protection circuit in the battery holder.
MBINSTALLING THE BATTERY PACK
Align the grooves in the bat- Release button
tery pack with the transceiver I | [JA
and slide the pack to the right S&S
until it locks in place. Le
To remove the battery pack S>
push up on the RELEASE button me
and slide the pack to the left.

MBBATTERY VOLTAGE LEVEL METER
The meter indicates the relative battery voltage during
transmit.
Recharge or replace the
reaches the low indicator.
NiCd Battery pack
batteries when the level
Model V | mAh Fully charged Fully discharged
PB-5 200
PB-6
72
PB-9 ipa
PB-7 1100
PB-8 | 12 | 600 =
=
=
=
=
Manganese or Alkaline batteries (Approximate battery condition)
New batteries Need to change batteries
MOPERATING TIME [Hour]
144MHz
430MHz
@ 1 minute Transmission, 3 minutes Reception, AF
output 0.2W/8Q.
® Battery Saver function on. Simplex operation mode.
CAUTION
When the battery is overdischarged, the indicator
begins flashing and the POWER switch may not func-
tion. Immediately charge or replace the battery.
We recommend use of the NiCd battery pack for long
transmission or extended operation.
Manganese batteries ( except
batteries ) is available for Low position.
Alkaline manganese

4. OPERATION
4-1. OPERATING
CONTROLS
@Antenna connector
Connect the antenna that is supplied to this connector.
Twist to lock.
@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 the — side.
NOTE
You should turn the power switch OFF when connect-
ing a power source to this terminal. Pay close atten-
tion to polarity.
Use the KENWOOD PG-2W or PG-3F optional cable for
connection.
@MIC jack
This jack is used for connection of an_ external
microphone. The use of an electret type microphone is
recommended. Input impedance is 2kQ and the DC
voltage on this terminal is Approx. 4 V (MAX 3.5 mA).
The use of a dynamic microphone is not recommended.
Speaker Hl iE
SP
Ground
Ext. S|
Ext. MIC
: Pals uF
3« Always ensure that this connection is made.
@SP jack
This jack is used to connect an stereophonic external
speaker or earphone. The recommended impedance is
80.
If you hold and press the DUAL key while you turn the
POWER switch to on, the radio will exchange 1 and 2
below.
1. Audio signals from both bands will be heard only
from the external speaker (initial setting).
2. Audio from TX band will be heard from the internal
speaker, and audio from RX band will be heard from
the external speaker.
(lf you hold and press the BAND key while you turn
the POWER switch to on, the band will exchange
each other.)

®VOL controls
Rotating the control further clockwise will increase the
volume.
@©SAQL(Squelch) controls
These controls are used to select the desired Squelch
threshold level.
@Tuning control
This control is used to select the desired
transmitter / receiver frequency, MHz step, Memory
Channel, Frequency Step, Tone
Direction, etc.
Frequency, Scan
@POWER switch
Press for longer than 0.1 second to turn the transceiver
ON or OFF.
@MONI switch
Pressing this switch will disable the squelch function as
long as the switch is held depressed.
When operating in the CTCSS (Tone Squelch) mode you
can use this switch to determine if the frequency is in
use before transmitting. Pressing this switch will disable
the CTCSS function as long as the switch is held
depressed.
After you press and hold this switch while you turn on
the POWER switch, rotating the Tuning control will
select monitoring band.
-1. Both main and sub band can be monitored.
-2. Main band only can be monitored.
-3. Sub band only can be monitored.
@PTT (Push To Talk) switch
Press this switch whenever you wish to transmit.

@LAMP key
This switch is used to control the night lamp on the LCD
display. The lamp will turn itself OFF automatically 5
seconds after the last key operation.
Pressing the key within 10 seconds of pressing the F key
will light the lamp on the LCD display parmanently until
pressing this key again.
©RELEASE button
Press this button upward to release the battery pack.
Speaker/
Microphone
@UXU / VM SCAN key
This switch is used to select dual UHF watch operation.
In dual watch operation the V indicator will light on the
previous VHF band display.
Pressing the key within 10 seconds of pressing the F key
will initiate VFO and last memory channel scan.
@CALL/C SCAN key
Press this key to activate the call channel function.
Pressing the key within 10 seconds of pressing the F key
will initiate CALL CHANNEL SCAN .
( Mode key )
When this key is held down and the power switched on,
it becomes the Mode key for switching between the
VFO mode, Memory channel mode, and Call channel
mode.
@BAND / A.B.C.(Automatic Band Change) key
This key is used to exchange the contents of the main
band and sub band.
Pressing the key within 10 seconds of pressing the F key
will transfer the contents of the sub band to the main
band whenever a signal is received at the sub band
antenna, which is strong enough to open the squelch.
The contents of the main band are transfered to the sub
band at the same time.(A.B.C. function)

@SUB UP key
This key is used to increment the SUB band receive
frequency or memory channel.
Pressing the key within 10 seconds of pressing the F key
will recall the UPPER LIMIT frequency of the
programmable band scan.
@SUB DOWN key
This key is used to decrement the SUB band receive
frequency or memory channel.
Pressing the key within 10 seconds of pressing the F key
will recall the LOWER LIMIT frequency of the
programmable band scan.
@©TONE / T.SEL key
Except European version: This key is used to activate
the subaudible tone encoder.
European version only: This key is used to transmit the
1750 Hz repeater access tone whenever this key is
depressed.
(U.S.A., Canadian version ,or with optional TSU-7)
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.
QSHIFT/ 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
simplex where no indicator shows.[ -
European version ( UHF band ) ].
Pressing the key within 10 seconds of pressing the F key
will reverse the transmit / receive frequencies during
repeater operations. If you have selected simplex this
key will not function.
@1/AL key
This key is used to set memory channel 1 on or off.
Pressing the key within 10 seconds of pressing the F key
will check Memory Channel 1 at approx. 5 second
intervals. If the channel is busy, a beep will sound.
Al ‘i MCT FF) _A
C3)
DT D X58
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©® © ® ®
@2/ S.CT key
This key is used to set memory channel 2 on or off.
Pressing the key within 10 seconds of pressing the F key
will turn the CTCSS function of the sub band on or off.
@3 / M.CT key
This key is used to set memory channel 3 on or off.
Pressing the key within 10 seconds of pressing the F key
will turn the CTCSS function of the main band on or off.
11

@F key
This key is used to activate control of the functions.
©4 / T.ALT key
This key is used to set memory channel 4 on or off.
Pressing the key within 10 seconds of pressing the F key
will turn the Tone Alert function on or off.
©5 / S.DT key
This key is used to set memory channel 5 on or off.
Pressing the key within 10 seconds of pressing the F key
will turn the DTSS function or the paging function of
the sub band on or off.
@6 / M.DT key
This key is used to set memory channel 6 on or off.
Pressing the key within 10 seconds of pressing the F key
will turn the DTSS function or the paging function of
the main band on or off.
@M / TX.S key
This key is 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 or off.
@7 / LOW key
This key is used to set memory channel 7 on or off.
Pressing
the
key
within
10
seconds
of
pressing
the
F
key
will
select
the
transmit
output
power
level
LOW,
MEDIUM
,
or
HI.
@8 /U. CHG key
This key is used to set memory channel 8 on or off.
After
pressing
the
key
within
10
seconds
of
pressing
the
F
key,
for
the
UHF
band
dual
watch,
this
key
is
used
to
switch
between
the
two
UHF
band
frequencies
used
for
the
VHF
band
circuit.
@9 / C. SEL key
This key is used to set memory channel 9 on or off.
Pressing the key within 10 seconds of pressing the F key
will
display
the
current
DTSS
code.
Use
the
numeric
keys
to select the desired DTSS CODE.

@ENT / LOCK key
This key is used to switch to the direct keyboard
frequency entry mode.
Pressing the key within 10 seconds of pressing the F key
will deactivate all functions except the POWER, LAMP,
PTT , MONI, and F then ENT ( LOCK) .
If you press and hold the 7 key while you turn on
the POWER switch the Tuning control lock function
will turn off or on.
(DUAL / DUP/ * key
This key is used to set the SUB band ON or OFF.
Pressing the key within 10 seconds of pressing the F key
will cause the duplex function to activate.
©0 / L.OUT key
This key is used to set memory channel 0 on or off.
Pressing the key within 10 seconds of pressing the F key
will set the MEMORY CHANNEL LOCK OUT function on
or off.
@Mkz / STEP/# key
This key is used to select the tuning rate of the Tuning
control. When the MHz indicator is lit, the Tuning
control will cause the transceiver to increase or decrease
in 1 MHz steps.
Pressing the key within 10 seconds of pressing the F key
will display the current VFO tuning step. Use the tuning
control to select the desired tuning step.
@SCAN / SUB (SCAN) key
This key is used to initiate main band scan.
Pressing the key within 10 seconds of pressing the F key
will initiate sub band scan.
@ Operations of functions not displayed on
panel
@ Press the M key, then the key below.
Key Function Refer to
Store the displayed data in pe
M then CALL eal carne P.25 4-4-5
M then MONI DIME Memory ent P37 4-7
Enter the displayed
frequency in the upper limit
M then SUB UP frequency of the P19 4-2-4
programmable VFO tuning
limit.
Enter the displayed
M then frequency in the lower limit
frequency of the P19 4-2-4
SUB DWN programmable VFO tuning
limit.

@ Press and hold the key below and turn on the power
switch.
Key Function Refer to
MONI-+ power nee P.9 MONI
oN Select monitoring band. switch
CALL+power | Call keychange tothe Mode | pig caLL
ON key. key
BAND+ power Speaker output band P.8 = SP jack
ON exchange
TONE + power Battery Saver function will P48 4-H
ON turn on or off.
SHIFT+ power Automatic Power Off
ON function will turn on or off. AB ctsle
The 1 key on the remote
1+power ON control microphone (SMC- P.53 SMC-33
33)
The 2 key
2+power ON on the SMC-33 P.53 SMC-33
3-+power ON iesihey P53 SMC-33
on the SMC-33
Key Function Refer to
44+ power ON Hold/resume mode of the VHF P30 4-5-2
band
Hold/resume mode of the
5+power ON UHF band P.30 4-5-2
6+power ON DTMF Delay Time (2 seconds) | P.36 4-6-4
M-+ power ON MEMORY RESET P.23 4-4-2
2 a‘ P13 ENT/
7+ IN trol lock
power0 Tuning control lock function LOCK key
g+power0N Memory recall mode P.26 4-4-6
9+ powerON Exchange TX band P.22 4-3
ENT+ powerON VFO RESET P.23 4-4-2
DUAL + powerON Speaker mode Pea Slate
0+ powerON Beep function on or off PAZ 4-2
MHz+powerON DTSS delay time P.40 4-8-4
SCAN-+ powerON Tone alert sound between P48 4-40
PiPiPi and PulPulPul
14

@ Press the M
key, the F key, then the key below
sequentially.
Key Function Refer to
Enter the displayed
M, F then SUB UP | frequency in the upper limit P.30 4-5-4
frequency of the
programmable band scan.
Enter the displayed
M, F then SUB frequency in the lower limit P30 4-5-4
DWN frequency of the
programmable band scan.
M, F then ENT Clear the displayed memory P30 4-4-5
channel data.
Display Panel
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On when Automatic Band Change
function has been activated.
On during duplex operation.
On when DTSS function is active
With the CTCSS unit TSU-7:
On when Tone Decode function is
active.
On when sub- band _ frequency
displays CALL channel.
On when sub_ band _ frequency
displays a memory channel.
Displays — operating transmitter
band.
This level meter indicates the
relative receive input strength or
battery voltage level during
transmit.
15

OV
O— +
(=
European version )
@R
Qn
0@
CORR
16
in UHF dual watch operation, the V
indicator will light if main band is
the previous VHF band .
Displays the selected
offset direction.
transmitter
During split channel operation, both
+ and — indicator light.
ON when REVERSE
active.
On when TONE ENCODE function is
active.
On when TONE ALERT function is
active.
The indicator flashes when receiving
a signal.
function is
Displays the operating frequency to
the nearest kHz, the frequency step
size ,or the tone frequency of the
sub band.
Flashes during scanning.
On when TX STOP function is active.
Displays the selected output
power,i.e. Low, Medium, and no
indicator Hi.
KU BUSY ]
@H
@ s8G.04:.
On when squelch is open.
On when BATTERY SAVER — function
is active.
Displays the operating main band
frequency to the nearest kHz, the
frequency step size, or the tone
frequency.
Flashes during
ON in paging mode.
ON in automatic dial mode.
ON
when
AUTOMATIC
POWER
OFF
function
is
active.
ON
when
PRIORITY
ALERT
function
is
active.
ON when LOCK function is active.
scanning.
Displays
the
current
Memory
Channel
number.
The
star
*
indicator
is
on
when
the
Memory
channel
will
be
skipped
during
Memory Channel Scan.
ON whenever the F key is depressed.

4-2. RECEIVER OPERATION
Audio confirmation is provided whenever a front panel
key is depressed. To disable this function press and hold
the 0 key, then turn on the Power switch.
4-2-1. Receiver Operation
Connect the battery pack and the supplied antenna.
Set the controls as follows:
1. Press the power switch for longer than 0.1 second..
HH
Mugg WL
B APO
The frequencies shown above are the default frequencies after a
microprocessor reset. If the display shows incomplete data or you
think the displayed frequency is in error, reset the microprocessor
Memory Initialization on page 23.
MAIN BAND
2. Rotate the MAIN VOL control clockwise until a UHF
signal or noise is heard coming from the speaker.
3. Rotate the tuning control to select an open channel.
4. Rotate the UHF SQL control clockwise until the noise
just disappears and the BUSY indicator turns off. This
point is known as the Squelch Threshold point.
5. Select the desired operating
tuning control.
frequency using the
SUB BAND
6. Rotate the SUB VOL control clockwise until a VHF
signal or noise is heard coming from the speaker.
. Press the UP/DWN key to select an open channel.
. Rotate the VHF SQL control clockwise until the noise
just disappears and the BUSY indicator turns off.
. Select the desired operating frequency using the
UP/DWN key .
10. When a signal is received the main/sub S-meter will
deflect and the main / sub BUSY indicator will turn
On.
11. To proportion the volume between the MAIN band
and SUB band, rotate the VOL control to the desired
point.
on
co}
Single band reception
13. Press the DUAL key. The SUB band frequency display
will turn off.
Wi

4-2-2. Frequency Selection
Rotate the Tuning control to select the MAIN band
frequency.Press the UP /DWN key to select the SUB band
frequency.
@ Direct keyboard frequency entry
1. Press the ENT key to select the ENTER mode.
2. Within 10 seconds of pressing the ENT key enter the
frequency from most significant digit to the least significant
digit.
The transceiver changes frequency after 1 kHz digits
have been entered (1 kHz digit is not displayed).
If 1kHz digit indicator flashes, enter the 1 kHz digit
frequency.
Before
nce entering 1kHz
OT 4 Id ERs) digit 5 indicator
B AP may flash.
If you make an error before entering all digits, press the
ENT key twice , then reenter all .
In 12.5 kHz ,or 25 kHz step size direct frequency se-
lection will be completed in the 10 kHz digit. When
you enter the following keys for the 10 kHz digit, 1
kHz and 100 Hz digit frequencies are automatically
selected from the list below.
OkHz
digit,
|
PRUENY
|
ro
KHz
aigit.
|
Frequency
0
00
5
50
i
12.5
6
62.5
z
25
7
75
3
37.5
8
875
4
37.5
9
875
4-2-3. Frequency Step Selection
To select the desired tuning or scan step size use the fol-
lowing procedure:
1. Press the F key momentarily, then press the MHz/STEP
key. The current frequency step size will be dis-
played.
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2. Rotate the Tuning control until the desired tuning
step size appears in the display.The frequency step is
indicated as shown below.
144 MHz band
5210215220212.522525
430 MHz band
10220212.5225210
3. To complete the programming of the step size you
can press the MHz/STEP key or simply wait 10 seconds
and the microprocessor will automatically return to
the normal frequency display.
The chart below illustrates the way the displayed fre-
quency will change when you change from one step
size to another.
For example:
Assume you are presently displaying a frequency of
439.920 MHz and had previously selected a 20 kHz step
size. If you were to change the step size to 12.5 kHz the
display would then read 439.925 MHz.
5,10,15,20 to 12.5,25 12.5,25 to 5,10,15,20
0,5,10,15 0 0 0
20,25,30,35 25 125 10
40,45,50,55 50 25 20
60,65, 70,75, 37.5 30
80,85,90,95 1 50 50
62.5 60
75 70
87.5 80
4-2-4. Programmable VFO Tuning Limits
The radio provides the capability of programming the
VHF or UHF VFO tuning range, in 1 MHz band segments,
as well a 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 segment by specifying any
frequency with these two segments. The Tuning con-
trols would then only tune within these specific. bands.
The procedure for specifying the bands is described be-
low.
1. Rotate the Tuning control until the desired
tuning range appears on the frequency display.
For example you might want to select the 144 MHz
band and dial up 144.100 MHz.
. Press the M key, then press the V key.
3. Rotate the Tuning control until the desired upper
tuning range appears on the frequency display.
. Press the M key, then press the A key.
5. To confirm that the programming was properly per-
formed rotate the Tuning control.
The transceiver should not go above or below the
programmed band limits.
6. To clear both programmed limits simultaneously, ini-
tialize the VFO memory (VFO RESET). You can repro-
gram either limit independently by following the ap-
propriate instructions above.
lower
nm
>

4-2-5. A.B.C (Automatic Band Change)
The A.B.C. function allows you to exchange the con-
tents of SUB band to the MAIN band automatically
whenever a signal is received in the SUB band and SUB
squelch is open. When the sub band is the TX band all
the following band changes are reversed.
1. Press the F key, then press the BAND/A.B.C key. The
A.B.C. indicator will turn on in the display.
2. As soon as a signal is received in the SUB band, band
change occurs .
The Tuning control is ineffective during this change.
ABC
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3. If PTT switch
released.
If PTT switch is not pressed, within 3 seconds after
the signal goes off,the MAIN band is restored to its
original frequency.
If BAND key is pressed,the MAIN band is restored to
its original frequency upon receiving the signal, and
the ABC function is on.
20
is pressed,the A.B.C. function is
4-2-6 UXU
(430 MHz Bnad Simultaneous Reception)
1. Set the main band to 144MHz in the VFO mode.
2.
When
the
U
XU
key
is
pressed
the
main
band
will
be
set
to
430
MHz
and
the
V
indicator
will
light.
(
The
V
indicator
lights
when
the
main
band
is
using
the
144
MHz
band
circuit.)
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When
the
430
MHz
band
is
received
using
the
144
MHz
band
circit,
the
sensitivity
is
lower
than
with
the
430
MHz
band
circuit.
The 144 MHz band circuit can be changed as follows:
Press
the
F
key,
then
press
the
8/U
CHG
key.
The
V
indicator
will
turn
off
in
the
display.
(When
the
sub
band
is
using
the
144
MHz
band
circuit,
the
V
indicator
does
not
light.)
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