SHAKESPEARE
model(s) wire color pin number
GBS-2500 Audio 1
GBS-1500 Ground 2
GBS-240 N/C N/C
  Common 2
  PTT 4
  receive 3
model(s) wire color pin number
GBS-2000 Audio 1
  Ground 2
  N/C N/C
  Common 2
  PTT 3
  receive 4
model(s) wire color pin number
740 Audio 1
  Ground 4
(Hi-Z, Use an amplified mic only) N/C N/C
  Common 3
  PTT 2
  receive N/C
model(s) wire color pin number
840 Audio 4
  Ground 1
  N/C n/c
  Common 1
  PTT 3
  receive 5