Duplex Operation; Frequency Offset - Icom IC-R30 Advanced Manual

7
OTHER FUNCTIONS

■ Duplex operation

The Duplex operation shifts the transmit frequency up or down from the receive
frequency by an offset. You can receive a communication that uses different frequencies
for transmitting and receiving (Duplex), by setting the frequency offset and shift direction.
While monitoring, the displayed frequency automatically changes to the transceiver
transmit frequency (Repeater input frequency).
When Duplex direction is set to "DUP+," the transmit frequency shifts down from the
receive frequency by the offset amount.
When Duplex direction is set to "DUP–," the transmit frequency shifts down from the
receive frequency by the offset amount.
D Frequency offset
The receive frequency shifts according to the set frequency offset and direction, while
holding down [SQL]. You can set the frequency offset in the QUICK menu. (p. 7-17)
Repeater access image
Example: Receiving a 430 MHz band repeater signal
Station A
RX: 447.540 MHz
TX: 442.540 MHz
Reverse the RX/TX frequencies and titles. The arrows FROM the transceivers to the
repeater are transceiver TX and the arrows FROM the repeater to the transceiver are
transceiver RX.
Repeater
RX: 442.540 MHz
TX: 447.540 MHz
7-16
Station B
RX: 447.540 MHz
TX: 442.540 MHz