SPARKOMATIC
model(s) wire color pin number
CB-1023 Audio 1
  Ground 2
  N/C N/C
  Common 2
  PTT 3
  receive 5
model(s) wire color pin number
CB-2023 Audio 1
  Ground 2
  N/C N/C
  Common 2
  PTT 3
  receive 4
model(s) wire color pin number
CB-1123 Audio 2
CB-5100 Ground 1
CB-5000 N/C N/C
CB-1040 Common 1
  PTT 3
  receive 4
model(s) wire color pin number
CB-2123 Audio 1
  Ground 4
  N/C N/C
  Common 5
  PTT 2
  receive 3