Jose wrote:

And if the stack has an audio panel worthy of the name, the opposite
transceiver's audio is cut off during transmit to prevent an unholy
squeal coming down the audio line of the receiver that is still
operating.


You sure? I've operated split (on different frequencies), and not been
cut off when the other pilot was transmitting. Does the audio panel
know what frequencies each radio is using?


And I have the newest Garmin audio panel. The pilot and copliot can
each talk on different frequencies at the same time.