Quote Originally Posted by mister_e
is this a 4 pins or 6 pins connector at the end (xlr type)? if so, maybe you could compare wit some Clear-Com headset and unit?

those bellow are much recent...
http://www.clearcom.com/Products/par.../headsets.html

in the past i repaired tons of white and green model.. but none had the circuit you discribe so far. everything was done with the beltpack.

Is there any model # or company name written on?

For sure you must have a base station somewhere to do some tests. So just probe it to get the Headphone outputs wire, mic, and probably you'll discover a Vdd line as well.
10 pins total at the connector, only 5 pins used, not an xlr type, in fact not even pins and sockets. They're almost more like a BGA chip and the outside shell of the connector does the job of applying the pressure by latching them together. I wish I had one here at the house so I could get a picture.

In forgot to mention in my last post, on the few headsets that I've gotten in that don't have that circuit I described earlier (and they don't work either!), on those 5 pins at the connector, I've got 1 to the braided shield (ground), 2 to the mike, and 2 to the earphones.

No company name or anything on them anywhere to be found, a couple of model numbers on the various plugs and one on the mike and earpiece. The books say to order a new one from Roanwell, which I called and doesn't sell them anymore (in fact they don't know anything about them).

I've got a functional station to test them out at, problem is it's about 12 miles away which is why I kinda want to rebuild this tester for the shop. I've probed it. Nothing spectacular. That same ground pin on the headsets, goes to the chassis of the box. If I touch 5v across the mike contacts at my station, I get clicks in earpieces at another station. If I touch 5v across the earpiece contacts at my station, I get light clicks in the mike at the other station, which is what I would expect. So, that tells me that I've got the right pins for the right job.

Maybe your beltpack and my switch/box/circuit board might have something in common. Next week, I'll try to reverse engineer that board and see what I come with. That'll probably tell me everything I need to know.

JDG