How do we reconcile the ground connection between audio eqp (TNCs, soundcards etc) and transceiver? Most of the audio eqp for digimodes has only one ground. I've seen that the common practice is to use only the PTT ground, either forgetting abt the MIC ground or soldering the MIC and PTT ground together. Obviously this would break the MIC ground isolation.
Related Q/A, Mic ground vs ground