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Microphone ground

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Vilhelm

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I know very little about electronics and avionics, so I have an interesting time trying to connect all them wires to my transceiver (which is an old Narco 120.) Fortunately I have a wiring diagram, or I would be complete lost, but I have a question.
I was once told, that the mike should have its own ground isolated from the common ground, which is of course the fuselage structure. Is that so ?
 

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