Adding a PR781 microphone to a 6400

olson339

Hello

I am new hear and recently purchased a 6400. I have it setup and it is operational. Been able to make QSOs with the stock mic fhm-2. However I would like to start using my Heil PR781. I purchased an xlr to 3.5 trs cable. Connected the cable to mic and the mic port on the back of the 6400. Changed the mic type on SDR to the 781 profile however when I key (PTT) I am unable to see any activity/modulation from the 781on the rf panel. The 6400 goes into transmit. As I said the stock mic works perfectly. So I must be missing. Any help or suggestions would be appreciated
73
Art de N2AJO

olson339

Steve

20db is on and bias is off. 3.5 is stereo- TRS

Steve Ellington

I keep a little Radio Shack test amplifier handy for diagnosing stuff like this. Just feed the 781 into it to verify it actually works first. Once this is confirmed you need to ensure you are using the correct pins on the mic jack. I have used a 781 fed directly into the balanced mic. port., not the stock mic. jack. You then need to select the proper input in Ssdr. That would be BAL.

Steve Ellington

I keep a little Radio Shack test amplifier handy for diagnosing stuff like this. Just feed the 781 into it to verify it actually works first. Once this is confirmed you need to ensure you are using the correct pins on the mic jack. I have used a 781 fed directly into the balanced mic. port., not the stock mic. jack. You then need to select the proper input in Ssdr. That would be BAL.

Steve Ellington

Probably right. Mine is a 6600.

olson339

Yes decided to buy a cable from Flex. Will confirm once it gets here.