It's just as the signal name implies. It's aircraft power that's routed in from the back connector, then through the radio's power switch and routed out the back connector to Pin P. Not many reasons I can think of to use it in a modern cockpit,
It's just as the signal name implies. It's aircraft power that's routed in from the back connector, then through the radio's power switch and routed out the back connector to Pin P. Not many reasons I can think of to use it in a modern cockpit,
Actually, that's a pretty good idea. I have my Icom backlight wired to the nav light switch - that way the backlight comes on, whether the radio is on or not, and I can actually see where the radio is to be able to turn it on!