My Upgraded K-3 has a noise when the transmitter is keyed. The noise sounds like either some type of data noise or a severe feedback The noise is there the moment that the radio is keyed, no type of voice input needed. I have checked all settings and can find nothing that is out of spec. I bypassed the 100 watt amp and the problem was still there. I am using Heil Proset headset and when the radio is put into test the audio is fine in the headset. I used the recorder to make sure the noise was there during transmit and I also set up a second radio to monitor the K-3. The noise was still there. I have no idea what to check next, if anyone has a suggestions it would be appreciated.
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