Duplex operation

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)

DSetting

qSet the receive station frequency (repeater output frequency). wPush [8 SET] for 1 sec. to enter set mode.

eRotate [R-DIAL]to select “SET EXPAND,” then push [8 SET].

BASIC OPERATION 4

IN EXPANDED SET MODE

rRotate [R-DIAL]to select “ON,” then push [8 SET].

tRotate [R-DIAL]to select “OFFSET FREQ,” then push [8 SET].

OFFSET-FREQ

4

 

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----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.)

[R-DIAL]

DUALWATCH

SET

8

***-SET-MODE-***

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-NOISE-BLANKER -ANL -AF-FILTER -AM-ANTENNA -FM-ANTENNA >SET-EXPAND

uRotate [R-DIAL]to select “DUPLEX.”

DUPLEX

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>OFF --DUP -+DUP

iRotate [R-DIAL]to select “–DUP” or “+DUP.” oPush [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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Image 33
Icom IC-R20 instruction manual Duplex operation, Setting, Rotate R-DIALto select Duplex