ICOM 2820 Adapter to use HM133 Microphone

[ke5ilq]

I ordered and received the adapters to be able to use the microphone that comes with the ICOM 2820.
But in the instructions it describes where to solder the single wire in both the Control head unit and the Radio unit.
The problem i have is my circuit board is different than the instructions.  Where do I solder the wire?
The units that I have are the MK-1258II

Thanks

[sm2o]

Im Sorry but as it says on the website, the HM133/IC-2820 boards only works together with RRC-1258MkIIs (see label on the bottom). The earlier version do not have the CPU pin free, so it's not possible to use them.

73 de mike

[ke5ilq]

Thank you,