I shouldn't bring this up again for someone will blame it on the "Pin 1
problem". The fact is there's typically 4 connections for microphone audio.
There is the Audio Hi or +, Audio Lo or -, Audio Ground, and Audio Shield.
That's 4! The big problem lies in the misunderstanding that Audio Lo, Audio
Ground, and Audio Shield can be the same or connected together. They can't
and shouldn't. Shield is shield and ground is ground. They aren't the same
as ground may be a current carrying conductor and shield should not be a
current carrying conductor.
In all of my mike lines there are 3 conductors which are surrounded by one
shield. None of these are used for DC or PTT. They are all for proper audio
connections.
73
Bob, K4TAX
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