AUDIOVOX
model(s) wire color pin number
MCB-30 Audio 3
  Ground 4
  PTT 2
  receive 1
model(s) wire color pin number
MCB-500 (not compatible with Silver Eagle plus) Audio 1
  Ground 6
  N/C 2
  Common 4
  PTT 5
  receive 3
model(s) wire color pin number
MCB-1000 Audio 1
  Ground 2
  Common 2
  PTT 3
  receive 5 or n/c
model(s) wire color pin number
MCB-750 Audio 1
  Ground 4
  Common 5
  PTT 3
  receive 2
model(s) wire color pin number
MCB-100 Audio 1
  Ground 2
  Common 2
  PTT 3
  receive 5
model(s) wire color pin number
MCB-2000 Audio 1
  Ground 6
  Common 4
  PTT 5
  receive 3
model(s) wire color pin number
MCB-3000 Audio 1
  Ground 2
  Common 3
  PTT 5
  receive n/c