Icom IC-R20 Instruction Manual - Page 33

Duplex operation - communications receiver

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BASIC OPERATION 4 ■ Duplex operation Duplex communication uses 2 different frequencies for transmitting and receiving. Generally, duplex is used in communication through a repeater, some utility communications, etc. During duplex operation, the transmit station frequency is shifted from the receive station frequency by the offset frequency. Repeater information (offset frequency and shift direction) can be programmed into memory channels. (p. 26) D Setting q Set the receive station frequency (repeater output frequency). w Push [8 SET] for 1 sec. to enter set mode. eRotate [R-DIAL] to select "SET EXPAND," then push [8 SET]. [R-DIAL] DUALWATCH ***-SET-MODE NOISE-BLANKER -ANL -AF-FILTER -AM-ANTENNA -FM-ANTENNA >SET-EXPAND SET 8 IN EXPANDED SET MODE r Rotate [R-DIAL] to select "ON," then push [8 SET]. tRotate [R-DIAL] to select "OFFSET FREQ," then push [8 SET]. OFFSET-FREQ 4 ----0.000.00 yRotate [R-DIAL] to set the desired offset frequency within 0.00000-159.99999 MHz range, then push [8 SET]. • The tuning step, selected in VFO mode, is used for setting. • Push [VFO MHz] for 1 sec. then rotate [R-DIAL] to change the frequency in 1 MHz steps, or push for 1 sec. again then rotate [R-DIAL] to change the frequency in 10 MHz steps. (Each push for 1 sec. toggles 1 MHz or 10 MHz tuning steps.) u Rotate [R-DIAL] to select "DUPLEX." DUPLEX OFF --DUP -+DUP iRotate [R-DIAL] to select "-DUP" or "+DUP." o Push [DUALWATCH] to exit set mode. !0Push and hold [SQL] to monitor the transmit station fre- quency (repeater input frequency) directly. 20

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20
4
BASIC OPERATION
4
Duplex communication uses 2 different frequencies for trans-
mitting and receiving. Generally, duplex is used in communi-
cation through a repeater, some utility communications, etc.
During duplex operation, the transmit station frequency is
shifted from the receive station frequency by the offset fre-
quency. Repeater information (offset frequency and shift di-
rection) can be programmed into memory channels. (p. 26)
D
Setting
q
Set the receive station frequency
(repeater output frequency)
.
w
Push
[8 SET]
for 1 sec. to enter set mode.
e
Rotate
[R-DIAL]
to select “SET EXPAND,” then push
[8 SET]
.
r
Rotate
[R-DIAL]
to select “ON,” then push
[8 SET]
.
t
Rotate
[R-DIAL]
to select “OFFSET FREQ,” then push
[8 SET]
.
y
Rotate
[R-DIAL]
to set the desired offset frequency within
0.00000–159.99999 MHz range, then push
[8 SET]
.
• The tuning step, selected in VFO mode, is used for setting.
• Push
[VFO MHz]
for 1 sec. then rotate
[R-DIAL]
to change the
frequency in 1 MHz steps, or push for 1 sec. again then rotate
[R-DIAL]
to change the frequency in 10 MHz steps. (Each push
for 1 sec. toggles 1 MHz or 10 MHz tuning steps.)
u
Rotate
[R-DIAL]
to select “DUPLEX.”
i
Rotate
[R-DIAL]
to select “–DUP” or “+DUP.”
o
Push
[DUALWATCH]
to exit set mode.
!
0
Push and hold
[SQL]
to monitor the transmit station fre-
quency
(repeater input frequency)
directly.
DUPLEX
-
-DUP
>OFF
-
+DUP
----------------
OFFSET
-
FREQ
----
0.000.00
----------------
[R-DIAL]
DUALWATCH
SET
8
***
-
SET
-
MODE
-
***
>SET
-
EXPAND
-
FM
-
ANTENNA
-
AM
-
ANTENNA
-
AF
-
FILTER
-
ANL
-
NOISE
-
BLANKER
----------------
■
Duplex operation
IN
EXPANDED SET MODE