In which flight situation would you talk to atc on a certain frequency, but listen to them on a different frequency?

Zaphod Beeblebrox

You would use it when contacting Flight Service (FSS) where reception is only available via the voice feature on an NDB or VOR. By the way, the FSS only performs a very limited ATC function which is relaying messages to / from an ATC facility, such as clearances and IFR releases.

FanMan

Not ATC, but often you can call Flight Service through a VOR station, transmitting on the frequency the VOR listens on (typically 122.1) and listen on the VOR's transmit frequency. Some aircraft radios do indeed have duplex ability, but many if not most aircraft have more than one radio so they can be set to different frequencies.

duck you sucker!

None. ATC is simplex, transmit/recieve on same frequency.

Pilsner Man

It doesn't work that way.

champer

Noe. One frequency is used for both transmit and receive. That's why you listen out before opening your big mouth. Aircraft almost invariably have more than one radio, and you might find yourself listening to, for example, ATIS on one while the other is set to the ATC frequency. You flipflop between the two as appropriate.

lowlevel

None. Aircraft and ATC only have AM half duplex radios that can transmit and receive on the same frequency only. When I used to do aerial firefighting we used an FM repeater network where transmission and reception were on different frequencies, but they were locked into thd channels selected on the radio so all you did was select the repeater and you’d be listening to it’s transmit frequency and transmitting on its receive frequency. When you transmitted it would be retransmitted to other repeaters in the network on their respective frequencies.

don r

I'm not licensed to use that kind of transceiver.