UTAC
model(s) wire color pin number
MICROMINI 23 Audio 1
ST-23 Ground 6
  N/C 2
(not compatible with silver eagle plus) Common 4
  PTT 5
  receive 3
model(s) wire color pin number
TRX-30 Audio 1
TR-18M Ground 2
  N/C N/C
  Common 2
  PTT 3
  receive N/C
model(s) wire color pin number
STUDIO-4000 Audio 1
  Ground 3
(Hi-Z, Use an amplified mic only) N/C n/c
  Common 3
  PTT 2
  receive n/c
model(s) wire color pin number
TRX-2000 Audio 3
  Ground 2
(Hi-Z, Use an amplified mic only) N/C N/C
  Common 2
  PTT 1
  receive N/C
model(s) wire color pin number
TRX-400 Audio 1
TRX-500 Ground 3
  N/C N/C
(Hi-Z, Use an amplified mic only) Common 3
  PTT 2
  receive 4