Duplex Operation - Icom COMMUNICATIONS RECEIVER IC-R3 Instruction Manual

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. 14)
This function is not available in the broadcast band (0.495
– 1.620 MHz) except for U.S.A. and Canada versions.
q Set the receive station frequency (repeater output fre-
quency).
w Set the shift direction and offset of the transmit station fre-
quency as described below.
e Push and hold [SQL] to monitor the transmit station fre-
quency (repeater input frequency) directly.
FM –DUP
146.100.000
TS 15.0
S1 3 5 7 9
VOL
FM DUP
P

DUPLEX OPERATION

◊ Duplex shift direction
q Push [FUNC] + [(MODE) SET] momentarily to enter set
mode.
• Select a non-band scope screen in advance for color LCD.
w Rotate [DIAL] until "Duplex" or "dUP" appears.
• "dUP" disappears after 1 sec. and "dP" appears when color LCD
is OFF.
e Push [↔] or rotate the tuning dial while pushing [FUNC] to
select "–DUP" or "(+)DUP."
• "–DUP" or "(+)DUP" indicates the transmit station frequency for
minus shift or plus shift, respectively.
r Push [(MODE) SET] to exit set mode.
Tone Squelch: OFF Tone Squelch:
Tone Freq. : 88.5 Tone Freq. :
Duplex : OFF Duplex
Offset Freq.: 0.600 Offset Freq.:
Scan Resume : 2SEC Scan Resume : 2SEC
Duplex direction set Minus shift
mode
9
OFF Tone Squelch: OFF
88.5 Tone Freq. : 88.5
: -DUP Duplex : +DUP
0.600 Offset Freq.: 0.600
Scan Resume : 2SEC
Plus shift
31