Originally Posted by
Pilot DAR
While we're here; RONLY is "receive only". I have never flown a plane which could receive but not transmit, though the odd time, your mic doesn't work, and you're technically RONLY, though I wouldn't file that way, it sounds silly!
In my experience in boats, that is a fairly common failure mode. Since transmit pulls many times the current of receive, it happens that a dodgy power connection allows the radio to receive, but as soon as you press the PTT the whole thing cuts out. And I have seen it in aviation handhelds with dodgy batteries.