I am looking for an inexpensive source for Desktop Microphones for our Micom HF and EF Johnson VHF radios
Any suggestions?
EFJ p/n - 589-0012-021 Desktop Microphone
Given the proprietary connector, and possible impedance concerns, I doubt anyone else makes them.
Dunno about Micom.
I just ordered a half dozen of the EFJ microphone connectors from Digikey. They're a HiRose 13-pin round connector (you have to order the pins also). On the EFJ, the pinout is pretty straight forward. I'm going to try a Motorola desk microphone that I have in the junk box. I don't have the EFJ pinout here at work but can get it if you need. There is switched DC available to the plug if you need a separate source to power a microphone....however, there is DC voltage present on the mic line to power a mic. There is also an audio line at the mic connector. I'm thinking of adding an aviation style headset adapter so I could use a headset in a high noise environment. EFJ microphones are pretty standard impedance and I'm thinking a motorola mic or deskset should be fine. An additional project I've got on the burner is a DC remote adapter so I could use a DC remote deskset (or several) in an EOC environment.
Jerry Wellman
Utah Wing
I understood about half of what you said but I would love you to send me any and all information you can because I have access to people who have more knowledge than I do!