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#1
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squealing Plantronic mic
Howdy,
Has anyone experienced a squealing plantronics headset mic? Ours was replaced by the company and started squealing again. It is hooked into a Becker 4201 which was tweaked by the factory as a troubleshooting measure. It seems like the mic is being affected by the antenna RF. If I hold it below the cockpit outside, it improves. Used to work just fine. Don't know what happened. Any ideas? BTW, the side tone is turned off. Tim |
#2
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squealing Plantronic mic
The last time I had this problem (with a homemade Les Sebald-designed
clip-on mic), I search high and low in the mic circuit and didn't find the problem. It turned out that it was caused by a bad connection in the antenna cable. The problem went away when I cleaned all the BNC connections and the antenna ground terminal attachment. Just a thought. Good luck! Bob K. |
#3
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squealing Plantronic mic
Thanks, Bob. I'll give the connections a good going-over and see what
happens.... Cheers, Tim Bob Kuykendall wrote: The last time I had this problem (with a homemade Les Sebald-designed clip-on mic), I search high and low in the mic circuit and didn't find the problem. It turned out that it was caused by a bad connection in the antenna cable. The problem went away when I cleaned all the BNC connections and the antenna ground terminal attachment. Just a thought. Good luck! Bob K. |
#4
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squealing Plantronic mic
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#5
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squealing Plantronic mic
Mike problems could be caused by the antenna as Bob suggests, or it could be
caused by a ground loop. A ground loop in the mike circuit might occur if there is more than one grounding point - for example where the shielded mike cable is grounded at the radio and also grounded at the metal panel where the mike connector is mounted. Sometimes simply insulating the mike connector from the panel will cure the problem. Colin |
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