Hi Hans,
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Yep, that did cross my mind..
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In fact my first attempt was to use a PC gaming headset with mic. The audio gain was very low from the headset compared to the electret mic's I found in my junk box.
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These electrets seemed to work quite well on my PC. I would have thought they would work equally as well on the QMX...
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I forgot the mention, I also removed an electret mic from a Baofeng speaker mic to use on the QMX. That gave the same results as the other electret mic's.
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Could you remind me of the mic that you used please?
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Cheers.
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Mel. M0KMD