To connect the external keypad to your Icom radio you’ll need to make a connector cable. For this we use GX-16 8 pin connectors and some multistrand cable. Here I’m using a 8 strand cable and both the male and female part of the GX-16 connector.

Color code

As long as you connect each pin of the connecter to its respective pin on the keypad, you are good to go. It’s not an issue if the color code of you cable is not the same.
I opened the connector of my HM-219 mic and copied Icom’s color code:

  1. Mic input = white
  2. 8 V = orange (not in use in the HM-219 mic)
  3. Frequency up and down = red
  4. Squelch = yellow (not in use in the HM-219 mic)
  5. PTT = brown
  6. PTT Ground = green
  7. Mic Ground = black
  8. AF Output = blue

8 Pin Screw Terminal (Version 1.00)

RJ45 – 8P8C (Versions 1.20 and 1.21)

Finished Connector Cable

To give the cable a professional finished look I used some transparent tubing as strain releave, just as Icom does for it’s microphones.

On the other end, the RJ45 connectors are protected by black RJ45 strain reliefs.

Part List

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