Quote Originally Posted by W1GUH View Post
I'm sure I remember one in the '730 I had -- for a while it didn't switch cleanly and put out a very gnarly buzz before it did. Sorta like a roger beep?

But I was just checking out the schematic and the one I found had no relay. I believe it turned on the B+ when the transmitter was keyed. Details, anyone? Maybe an upgrade?
Yeah the PTT relay mod was done a lot. Not included from the factory.