Could be used for TR signal to a mast preamp or an external amp, but most of those I have seen need 12V by deafult. I suspect the 5V is more useful for transverter TR switching for simplified connections (fewer wires). You could have the transverters mounted on a tower making this method more attractive. Several transverters support this method of switching. They in turn usually have external PTT. By the time you get a chain of VHF+ equipment hooked up on towers and such, you are probably looking at a sequencer and/or careful use of indicator contacts on TR relays for positive switchover control vs a pure timing based operation (hoping the relay switches in time, every time).
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