ALINCO
model(s) function connection
A-2507 mic audio Black
  Ground Black and Shield
  transmit Red
  receive speaker
model(s) function pin number
A-2530 mic audio 1
  Ground 2
  transmit 3
  receive n/c
model(s) function connection
A-2533 mic audio Audio
  Ground ground
  transmit control
  receive speaker
model(s) function pin number
A-2564 mic audio 4
A-2568 Ground 3
  transmit 2
  receive n/c
model(s) function pin number
A-2569 mic audio audio
  Ground ground
  transmit control
  receive speaker
model(s) function pin number
KN-2500 mic audio 3
KN-2550 Ground 4
KN-2580 transmit 1
KN-2585 receive 5
model(s) function pin number
KN-2526 mic audio 1
KN-2565 Ground 2
KN-2567 transmit 3
  receive n/c
model(s) function pin number
KN-2560 mic audio 1
  Ground 4
  transmit 2
  receive n/c