YAESU
model(s) wire color pin number
FT-101B Audio 2
FT-101E Ground 1
FT-301D N/C n/c
FT-901 Common 1
FT-7B PTT 3
FT-225R/RD receive N/C
model(s) wire color connection
FT-401B Audio ring
  Ground sleeve
  N/C n/c
  Common sleeve
  PTT tip
  receive n/c
model(s) wire color pin number
FT-720R Audio 1
  Ground 4
  N/C n/c
  Common 4
  PTT 3
  receive n/c
model(s) wire color pin number
CPU-2500R Audio 6
  Ground 5
  N/C n/c
  Common 5
  PTT 4
  receive n/c
model(s) wire color pin number
FT-2 Auto Audio 2
  Ground 1
  N/C n/c
  Common 1
  PTT 3
  receive 4
model(s) wire color pin number
most 8 pin models Audio 8
  Ground 7
  N/C n/c
  Common 7
  PTT 6
  receive n/c