Mic Pinout

[kd4wiwems]

Hello - I'm trying to install several radios in a retired fire truck and run them thru a Sigtronic US-45D intercom. I need to find out which pins correspond to MIC LO, MIC HI, PTT LOW and PTT HI for a Yaesu FTM-400XDR/DE and Regency RH-256. I would greatly appreciate any help anyone can give me. Thanks in advance.

 

[AK9R]

The mic pinout for the FTM-400 should be in the owners manual that you can download from Yaesu's website. I'd also look at whatever packet connections the radio has as that might be more convenient than the mic connector.

 

[radiotweester]

I've never worked with these, but this is what I dug up for you to test. Manual was dated 1990.
Best of luck