ICOM
model(s) wire color pin number
ic-280 Audio 1
  Ground 4
  N/C n/c
  Common 4
  PTT 2
  receive n/c
model(s) wire color pin number
most 8 pin radios Audio 1
  Ground 7
  N/C n/c
  Common 6
  PTT 5
  receive n/c