Kenwood TH-26A User manual

7\
·m
Z
144MHz FM TRANSCEIVER
TH-26A/26AT 126E
VHF FM TRANSCEIVER
TH-26A
430MHz FM TRANSCEIVER
TH-46A/46E
440MHz FM TRANSCEIVER
TH-46AT
UHF FM TRANSCEIVER
TH-46A
INSTRUCTION MANUAL
KENWOOD CORPORATION
©PRINTED IN JAPAN B50-8339-00(K,M,P,T,W, X)(T)
90112 11 10 9 8 7 6 5 4 3 2 1 891 12

Thank you for purchasing this new transceiver .
IMPORTANT
Please read this instruction manual carefully before
placing your transceiver in service .
SAVE THIS INSTRUCTION MANUAL.
The following explicit definitions apply in this manual:
NOTE
CAUTION
: If disregarded , inconvenience only , no
risk of equipment damage or personal
injury .
:
Equipment damage may occur , but not
personal injury.
This Instruction Manual covers the following models:
TH-26A : 144MHz FM (VHF FM) transceiver without
TH-26AT
TH-26E
TH-46A
TH-46AT
TH-46E
DTMF Pad .
: 144MHz FM transceiver with DTMF Pad .
: 144M Hz FM transceiver.
: 430MHz FM (UHF FM) transceiver without
DTMF Pad .
: 440MHz FM transceiver with DTMF Pad .
: 430MHz FM transceiver.
Under normal circumstances , the transceiver will
operate in accordance with these operating
instructions . The transceiver has been adjusted at the
factory and should only be readjusted by a qualified
technician with proper test equipment.
2
Attemp ti ng service or alignment without factory
author iz ation can void the transce i ver's warranty .
CAUTI ON
Long transmissions or extended operation in the HI
powe r mode might cause the rear of this transceiver
to g et warm . Do not place the transceiver where the
heat s ink (rear panel) might come in contact with
plasti c or vinyl surfaces . Use of an external antenna
for f ix ed station is recommended .
FCC WARNING
This e quipment may generate or use radio frequency
energy . Changes or modifications to this equipment
may cause harmful interference unless the
modif ic ations are expressly approved in the
instru ct ion manual. The user could lose the authority
to op e rate this equipment if an unauthorized change
or mo dification is made.

CONTENTS
1. BEFORE OPERATION ........................ .. 4
. 2. SPECIFICATIONS AND ACCESSORIES ...•... .. . .. 6
3. BATIERY PACK . .. .. .. .. .. .. .. .. .. . .. .. ... 9
4. OPERATION
OPERATING
CONTROLS ... .. .. ... . .. . .... .•.. 12
RECEIVER OPERATION .... .. .. . .. .. .. .. .. .... 19
TRANSMITIER OPERATION .. .. .. .... .. .. .... 21
MEMORY ....... .. ........... .. ............. 23
Microprocessor Memory back-up
Microprocessor Initialization
Memory Contents
Memory Entry
Memory Channel Recall
Memory Shift
Clearing a Memory Channel
Automatic Memory Initialization
S~N .. .... . ...... . .............•. . ........ ~
REPEATER OPERATIONS . ........... ....... .. 32
Transmitter Offsets
Reverse Function
Tone and CTCSS operation
Autopatch Operations
CHANNEL DISPLAY MODE .. .. .. .. . .. .. ... .. .. 35
TONE ALERT SYSTEM ... . .. ... .. ... ...... .. .. 36
BATIERY SAVER ...................... ... ... 36
AUTOMATIC POWER OFF .......... .... .. . ... 37
OTMF MEMORY FUNCTION .. .. . .. . .. .. .. .... 38
DTSS (Dual Tone Squelch System) ........... .. 39
5. BLOCK DIAGRAM ............•.•.•... insert
SCH EM ATIC DIAGRAM .. .. .. .. .... . .. . ... in s ert
6. MAI NT ENA N CE ... ..... .. .. ... .. .... .. .... .. 42
7. OPTI ON AL ACCESSORIES .. .. .. .. ..... ..... .. . 44
3

1. BEFORE OPERA liON
TO PREVENT EL E CTR IC SHOCK, FI RE AND OTHER
INJURY. PLEASE NOTE T HE FOLLOWING:
Do not place this unit , where it will be exposed to direct
sunlight or close to heating appliances .
Do not place anything on top of the cabinet.
4
Do n ot pla ce the unit in areas of excessive dust , high
humid ity or on unstable surfaces .
Do n ot drop pieces of metal , needles , coins and other
electr ica lly c onductive materials into the unit.
If an a bnormal odor or smoke is detected , immediately
turn t he power off . Contact the KENWOOD service
stat i on or your dealer.

CLEANING
1. Turn the power off , before cleaning the unit.
. 2. Do not use any type of abrasive pad, thinner , benzine
or any substances which may damage the unit.
3. Wipe the front panel and other exterior surfaces of
the unit with a soft dry cloth or a soft cloth lightly
moistened with water.
5

2. SPECIFICATIONS AND ACCESSORIES
2-1. SPECIFICATIONS
U.S.A. versio n
FREQUENC Y RANGE
European and U.K.v er sion
Othe rs
MODE
MEMORY CHANNELS
ANTENNA IM PEDANCE
~
POWER
External power supply
...
'"
REQUIREMENT w
Battery terminal
z
w
'" 13.8 V( Ext. power supply)
HI
7.2V( Battery )
LO transm it mode
CURRENT DRAIN
EL transm it mode
RECEIVE mode with no s ignal
BATTERY SAVER mode
AUTOMATIC POWER OFF
mode
GROUND
6
TH-26A / 26AT /26E TH-46A / 46AT / 46E
144 -148 MH z
438 - 450 MHz
144 -146 MH z 430-
440 MH z
144 - 148 M Hz
430 - 440 MHz
or 438- 450 MHz
F3E ( FM)
20+1 (C all Channel)
50n
6 -16 VDC (1 3.8 VDC nominal )
5
-15 V DC
Less than 1 .5 A
Le ss than 2. 0A
Approx . 1.0 A
Appro x. 1.0 A
Approx .0.5A Approx .0.6A
Approx .0. 12 A Approx .0. 15 A
Approx . 55 mA
Appro x. 65 mA
Approx . 17 mA
Appro x. 6 mA
Negative

TH-26A/26AT /26E
TH-46A / 46AT / 46E
DIMENSIONS
Projections not included 58x 135.5x 29.5 mm (2-9/32"x 5-11 /32" x 1-5/32 ")
(WXHxD)
Projections included 68.5x 147 .5x 34 mm (2- 11/16 "x5-13/16"x1-11/32")
~
""
'"
WEIGHT
Wilh NiCd Battery and Anlenna 38D 9 (0 . 84Ibs) w
z
w
'"
OPERATING TEMPERATURE -2D "C- +60 "C (-4 "F -140 "F)
MICROPHONE IMPEDANCE 2kn
13.8 V (Ext. power supply)
More than 5W
HI
7.2 V (Battery)
Approx. 2.5 W Approx .2W
OUTPUT POWER
'"
LO
Approx . 0.5 W
w
~
,.
EL Approx. 20 mW
'"
z
""
MODULATION
REACTANCE
'"
...
MAXIMUM FREQUENCY DEVIATION
±5kHz
SPURIOUS RADIATION Less lhan - 60 dB
DUTY CYCLE OPERATION 1 minute transmission 3 minutes reception recommended
CIRCUITRY
DOUBLE CDNVERSIDN SUPERHETERODYNE
INTERMEDIATE
1 st IF
16 .9 MHz 30.825 MHz
'"
FREQUENCY
2 nd IF 455 kHz 455 kHz
w
>
w
Less than 0.18 "V Less than 0.18"V
u
SENSITIVITY
12dB SINAD
w
'"
SQUELCH SENSITIVITY Less than 0.1 "V
-6dB More lhan 12 kHz
SELECTIVITY
-40 dB Less than 28 kHz
7

TH- 2 6A / 26 AT 126E
I
TH-46A /4 6AT/ 46E
~ ~ I AUDIO OUTPUT POWER (ac ro ss sn load 1.0 % M
or et ha n 2.0 .0 mW
~;:.. distortion )
Note
Circuit and ratings are subject to change without notice , due to developm en t in te chnology .
2-2 . ACCESSORIES
Unpack your transceiver carefully and confirm that the accessories listed be low are included in the box .
1.
Antenna ....................... . .... ... .... .
for 144MHz .... . ... . . . .. T90-0407 -OS
or for 430/440MHz ... .. .. T90 - 0406-0S
2. Belt Hook .. .. .. .. .. ... J29-0424-04 1
3. Battery Case BT-6 (TH-26A M and M2 type only) ... . . . 1
4.
Hand Strap ... . ...... . . .. J69-0312-04 ....•. 1
S. Battery (Except TH-26A M and M2 type) ... .. ... 1
NiCd battery pack PB-l0 .. . ... W09 - 0S3S - 0S
6. Battery Charger ... . . ... . ...... ...... . .... . .. 1
for U.S.A. and Canada version (120V) .. .... W09-031S-XX
for Europe version (220V) ... . ..... W09 - 0317-XX
for U .K. vers i on (240V) ... .. ... .. . W09-0318 - XX
for O ce ania versio n (240V) .... . ... W09-0S22 - XX
for Ot her market (120 / 230V) (TH-26A M3 and M4
type, T H-46A M and M2 type only) ... . .. W09-0S34-XX
7. Labe l ................... B42-3391-04 1
8.
Botto m Cover BM-l ... . .. F07 -0896-03 1
9. AC p lu g (TH - 26A M3 and M4 type , TH-46A M and M2
type onl y) ...... ... ...... E19-02S4-0S 1
10 . War ra nty Card (U.S.A ., Canada , and European
ver sio n on ly) ... . . .... . .... .... . ..... .... . .. 1
11. Instr uc tion Manual ... .. BSO-8339-XX .. .. . 1
After unpacking
Shipping container : Save the boxes and packing in the event your unit needs to be transported for remote
operation , maintenance , or service .
8

3. BATTERY PACK
3-1. NiCd BATIERY 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 greater than 2 months it
should be recharged before use.
3-2. RECHARGING
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 BC -9
hours .
The useful life and battery
performance will be reduced
if you exceed the recom-
mended charge period .
to AC outlet
Note
Recharg i ng should be performed within an ambient
temper at ure range of between 5'C - 40 'C (41'F -
104 ·F ).
Rechar gi ng the battery outside of this range may not
allow th e battery to reach full charge.
3-3. MANGANESE or ALKALINE
BATIERIES
(Optional Battery Case BT-6)
Install 6 x R6 (AA) manganese
or alka line batteries in the bat-
tery holder. Pay close attention
the battery polarities marked
in the holder. We recommend
the us e of high performance
mangan es e batteries for the
greates t operating time.
Note
Do not install NiCd batteries
and attempt to charge them
with t he supplied charger.
There is no battery protection
circuit in the battery holder.
Press down on the hook in the
middle of the battery case top
to open.
Hook
9

3-4. INSTALLING THE BATTERY PACK
Align the grooves in the bat-
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.
Relea se button
3-5. BATTERY VOLTAGE LEVEL METER
The S meter indicates the relative battery voltage dur-
ing transmit.
Recharge or replace the batteries when the level
reaches the low indicator.
Manganese or Alkaline batteries
New batteries Need to replace
ApprOXimate battery condition
10
Mode l v
PB-11
6
PB- 5
PB- 6
mAh
1200
200
NiCd Battery Pack
Full charged
Fully discharged
•• :::.:::":':"::":::::: The ON AIR indicator
•••• :::,: ~'::::: :n : : :::: will not light.
r--- ••••••
PB-9 7 .2 600
or
PB-lO
PB- 7
'1100 ••••-••.
PB-8
I-----j 12 600 ••• _ ••••••• •••••••• :X:::::::
PB-1 1

3-6. OPERATING TIME
We recommend use of the NiCd battery pack for long
transmission or extended operation.
Manganese batteries (except Alkaline manganese bat-
tery) are suitable only for LOW or Economic Low power
transmission.
OPE RATING TIME (hours)
TH-
26A ! 26AT !26E TH- 46A ! 46A T! 46E
MODEL V
mAh High power I Low power I
Ec ono mic
High power I Low power I
Economic
Lo w power
Lo w power
PB-8 ,
II
12
600
4 7.5 , 15 3.5 7 ,
14
PB-7 7.2 1100 8.5 ,
14 28
7.5 13
!
27
,
PB- 6, g, 10 7.2 ,
600
5 , 7.5 15 4 7 ,
14
PB-5
7.2 : 200 1.5 2.5 , 5 1.5 2.5
, 4.5
PB-II 6 , 1200 10
15 30 9.5
14 29
:
• 6 seconds transmission, 6 seconds reception, 48 seconds reception with no signal recommended .
• BA HERY SAVER function ON.
11

4. OPERATION
4-1, OPERATING CONTROLS
CD Antenna connector
Connect the antenna that is supplied to this connector.
Twist to lock .
(V Volume cont r ol I Power switch
The volume control and power switch are combined .
Rotating the control clockwise will turn ON the
transceiver . Advancing the control further clockwise
will increase the volume .
@
SQL control
This control is used to select the desired Squelch
threshold level.
@ MHzkey
This key is used to select the tuning rate of the Tuning
control. When the MHz indicator is lit, the Tuning
12
contro l will cause the transce i ver to increase or decrease
in 1 MHz steps .
Press and hold the key for longer than 1 second to
initiate MHz scan . Pressing the key after scan has been
initiat ed will c ause scan to stop .
Press ing the key within 10 second s of pressing the F key
will all ow you to change the frequency step.
Turn th e power on while pressing this key to initiate the
Autom at ic Memory Initialization . Automatic storage
will th en begin from the f requency that appeared in
the d is play before the power was turned off . Se e
sectio n 4-4-8 for additional information on this
functi on.
@ VFO k ey
This ke y is used to return to VFO operation after
operat in g in the memory channel or CALL channel
mode . The Tuning control will increase or decrease
freque nc y in ac c ordance with the VFO i ndicator.
Press a nd hold the key for longer than 1 second - to
initiate VFO scan . Pressing the key after scan has been
initiate d will c ause scan to stop .
Pressi ng the key within 10 seconds of pressing the F key
will co py the memory channel or call channel data to
the V FO. Th is allows you to change parameters or that
chann el without actually changing the data that has
been st ored in memory .

Pressing the F key for longer than 1 second and then
pressing the VFO key will initiate VFO or Memory scan.
. Pressing the key after scan has been initiated will cause
scan to stop.
If you press and hold the VFO key while you turn on the
POWER switch you will reset the microprocessor's VFO
memory, without destroying the memory channel or
call channel data.
@MRkey
This key is used to the select MR (Memory Recall) mode
from the VFO mode. The Tuning control can then be
used to select the desired memory channel.
Press and hold the key for longer than second to
initiate memory channel scan. Pressing the key after
scan has been initiated will cause scan to stop.
Pressing the key within 10 seconds of pressing the F key
will store the displayed data into memory.
In the memory channel mode pressing the F key for
longer than 1 second and then pressing tha MR key will
cause the memory channel to be skipped during
memory channel scan.
If you press and hold this key while you turn on the
POWER switch you will clear all the memory channels.
(1)CALL key
Press this key to activate the call channel function.
Press and hold the key for longer than 1 second to
initiate call channel scan. Pressing the key after scan has
been init ia ted will cause scan to stop .
Pressing t he key within 10 seconds of pressing the F key
will store t he displayed data into call channel.
Pressing the F key for longer than 1 second and then
pressing t he CALL key will initiate V/ M/ C scan. See
section 4-5-9 for additional information on this
function . Pressing the key after scan has been initiated
will caus e scan to stop.
If you press and hold this key while you turn on the
POWER sw itch you will be able to turn the AUTOMATIC
POWER OFF function ON or OFF.
@ON AIR i ndicator
ON when ev er the transceiver is in the transmit mode .
®T.ALT key
This key is used to activate the Tone Alert function.
Pressing t he key within 10 seconds of pressing the F key
will turn the BEEP function OFF or ON.
Pressing the F key for longer than second and then
pressing the T.ALT key will cause radio to toggle the
hold / resume mode between Time Operated scan and
Carrier Operated scan.
13

If you press and hold this key while you turn on the
POWER switch you will be able to turn the BAITERY
SAVER function ON or OFF.
@)Tuning control
Rotate this control clockwise to increase the frequency
and counterclockwise to decrease the frequency.
This control is also used to select the desired memory
channel and the scan direction.
LCD display
CD- B +
6
-+- --{7
~+---f8
Displays the selected transmitter offset direction. When
neither indicator is ON the transceiver is in the Simplex
mode. When both indicators are ON the transceiver is in
the Split Channel mode.
~ R indicator
14
This indicator is ON when the Reverse function is on.
@DTSS indicator
This indicator is ON when the DTSS function is active.
@CTCSS indicator
T: This indicator is ON when the Tone Encode
function is active.
CTCSS : This indicator is ON when the Tone Decode
function is active.
([)T. ALT indicator
This in dicator is ON when the Tone Alert system is
active . The indicator will flash when a signal is received .
®Memory channel indicator
This indicator is used to show the selected memory
channe l number.
CDMemory indicator
This in dicator lights during Memory Recall mode , and
flashes during Memory entry.
@F ind ic ator
ON whenever the F key has been depressed.
@* indicator
This indicator is ON when the displayed memory
channe l will be skipped during memory scan
operations.
@)500 Hz dot
This indicator show 500 Hz .
®
Hz dot
This indicator lights during CTCSS frequency selection,
and is used to show the 1 Hz digit.
This indicator is also ON when the Battery Saver and
Automatic Power Off function have been canceled.

@ VFO indicator
This indicator lights during VFO operation .
. @ ••••••••••••
Used to indicate the relative receive signal strength , or
as an indication of the battery voltage level during
transmit.
@ MHzdot
This indicator flashes during scan operations.
@ MHz indicator
This indicator flashes during MHz tuning steps .
@
BUSY indicator
ON whenever there is a signal present strong enough to
open the squelch, or when the squelch is not activated ,
and the CTCSS key is OFF.
@ APO indicator
This indicator is ON when the Auto Power Off function
is active .
@S indicator
This indicator is ON when the Battery Saver function is
active .
@
Frequency display
Displays the operating frequency to the nearest kHz .
eD MON Is witch
When operating in the CTCSS (Tone Squelch) mode you
can use this k ey to determine if the frequency is in use
before tr ansmitting. Pressing this key will disable the
CTCSS function as long as the key is held depressed.
If you press and hold this key while you turn on the
POWER switch you will change to channel display or
frequency display.
(2)PTI (Push To Talk) switch
Press thi s switch whenever you wish to transmit.
15

666
(10}---+l -"!" 6 6 6
666
666
@LAMP switch
1750/LAMP switch (European and U.K. version)
(Except European and U.K. version)
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.
16
If you press and hold this key while you turn on the
POWER switch you will clear all the microprocessor 's,
operator programmed , memory section.
(European and U. K. version)
This switch is used to transmit the access tone, you need
not pre ss the PIT switch.
Pressin g the key within 10 seconds of pressing the F key
will control the night lamp on the LCD display . The lamp
will turn itself OFF automatically 5 seconds after the last
key operation.
Pressing the F key for longer than 1 second and then
pressing the this key will light the lamp on the LCD
display .
If you press and hold this key while you turn on the
POWER switch you will clear all the microprocessor 's,
operato r programmed , memory section .
® EL LH switch
This switch is used to select the transmit output power.
@RELEASE button
Press th is button up to release the battery pack .
@F.LOCK switch
This key will deactivate all functions except the Lamp ,
MONI, PIT functions.

(1) Speaker
@Microphone
@Battery case
®DTMF PAD (with the TH-26AT I 46AT)
This pad is used in conjunction with a repeater to
provide AUTDPATCH capabilities.
@
SPjack
This jack is used to connect an external speaker or
earphone. The recommended impedance is 80.
@
MICjack
This jack is used for connection of an external
microphone. The use of an electret type microphone is
recommended. Input impedance is 2kO and the DC
voltage on this terminal is Approx. 4 V (MAX 3.5 mAl ·
Note
The use of a dynamic microphone is not recommend-
ed.
@ 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 - side.
Note
You sh o uld turn the power switch OFF when connect-
ing a p ower source to this terminal. Pay close atten-
tion to the polarity .
As a p recaution, do not remove the battery pack
when an external power supply is used .
Use th e KENWOOD PG-2W or PG-3F optional cable for
the co nnect i on .
Speaker : "-
Sp
~
"
; V
.p2 .S
Plug x
Ground w
'"
,
5 V , 0
5 V !
M~C
V ~
. ~
•
MIC
~
U
1\
lE
pn
, +
10 .... F
pn
,
~
, w
@Fkey
This k ey is used to activate control of the functions
printed above the various controls . The " F" indicator
will tu rn ON for approximately 10 seconds after you
17

press this key . You must press the desired 2nd function
key before the indicator turns off.
@ TONE / CTCSS key
Pressing this key by itself causes the radio to select the
desired tone signaling mode. When the "T" indicator is
illuminated in the display the transceiver will transmit
the selected subaudible tone. When the " CTCSS"
indicator is illuminated the transceiver will both
transmit the subaudible tone and will also remain
squelched until the proper subaudible tone is received.
TONE frequency selection
Pressing the key within 10 seconds of pressing the F key
will allow you to select the desired tone frequency. The
display will indicate the current Tone frequency . To
change to a different tone frequency rotate the Tuning
control until the desired tone frequency appears in the
display .
Press this key while turning on the power to select the
mode for the REMOTE CONTROL MICROPHONE (SMC-
33) switch.
@ SHIFTkey
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 . [- to Ei for
European version ]
18
Pressin g the key within 10 seconds of pressing the F key
will turn the DTSS function ON or OFF .
Pressin g the F key for longer than 1 second and then
pressin g the this key will allow you to select a DTSS
code.
If you press and hold this key while you turn on the
POWER switch you will store the currently displayed
data as the · Iower lim it for the programmable VFO
tuning li mit function.
@ REV k ey
This key is used to reverse the transmit / receive
frequen c ies during repeater operations . If you have
selected simplex this key will not function .
PreSSin g the F key for longer than 1 second and then
pressing the this key will allow you to change the delay
time wh en DTSS is being sent out.
If you press and hold this key while you turn on the
POWER switch you will store the currently displayed
data as the upper limit for the programmable VFO
tuning limit function.

4-2. RECEIVER OPERATION
4-2-1. Receiver Operation
Connect the battery pack , and the supplied antenna.
Set the controls as follows :
1. Rotate the POWER switch clockwise to turn the
transceiver ON . A frequency will appear in the
display .
2. As the VOL control is rotated . clockwise either
background noise or a aso will be heard coming
from the speaker , provided the CTCSS and squelch
are not ON .
3. To eliminate the no signal noise turn the SaL control
clockwise to the point the background noise just
disappears. This point is known as the squelch
threshold point.
4. Select the desired operating frequency using the
Tuning control.
4-2-2. Frequency Selection
• VFO Mode
1. Press the VFO key .
2.
Turn the Tuning control to increase / decrease the
frequency. The step size is determined by the
location of the VFO indicators . (See Step Size
Selection below .)
•
MHz Mode
1. Press the MHz key . The MHz indicator will begin
flash in g.
2. The T uning control will now increase / decrease the
opera t ing frequency in 1 MHz increments .
3.
The t uning step will revert to the VFO mode 10
secon ds after you stop turning the Tuning control.
4-2-3 . Step Size Selection
The fre q uency step is indicated in the chart below .
C 5 ~ 10 ~ 15~20 ~ 12 . 5 ~ 25'
To sele ct the desired tuning or scan step size use the
followin g procedure:
1. Press t he VFO key to select the VFO mode .
2.
Pres s the F key momentarily . The F indicator should
light in the display .
3. Pres s the MHz key within 10 s econd s of pressing the F
key . The current frequency step size will be
displ ay ed .
4. Rot ate the Tuning control until the des i red tuning
step si ze appears in the display .
5. To co mple te the programm i ng of the step size you
can pr ess MHz key or simply wa it 10 seconds and the
micro p roce s sor will automatically return to the
norm al frequency display .
19

The chart below illustrates the way the displayed
frequency will change when you change from one step
size to another.
5. 10. IS. ZO 10 12~. 25 12 S. l!> 10 L
".
IS. 2'0
,. ,.
".
" , ,
12.5 "
ZOo 25. )/), 35
" " "
",
~
.0. '5, SO. SS
" " "
62.5 "
50, 65,
".
" " " " 80. 85. 90. 95 .n
"
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.
4-2-4. Programmable VFO tuning limits
The radio provide the capability of programming the
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
controls would then only tune within these specific
bands. The procedure for specifying the bands is
described below .
1. Press the VFO key to select
the VFO mode .
20
2. Rota te the Tuning
until the desired
tuning range appears
frequency display.
control
lower
in the
For ex ample you might want
to select the 144 MHz band ,
and dia l up 144.100 MHz .
3. Turn off the transceiver
POWER switch. Now press
and hold the SHIFT key while
you turn on the POWER
switch . You will hear a beep
when you turn the radio
back on. This indicates that
the lower limit has been suc-
cessfully stored in memory .
4.
Now select the desired upper
tunin g limit using the MHz
key an d the Tuning control.
With our example we want
the up per band limit to be in
the 145 MHz band , and
there fo re dial up 145.100
MHz .
5.
Turn off the transceiver
POWER switch. Now press
and h old the REV key while
you turn on the POWER
switc h. You will hear a beep
when you turn the radio
POWER OFF
POWER ON
POWER OFF
POWER ON
~
REV