If your K3 is connected to your computer for logging or rig control 
purposes, make certain that the ground of the K3 is adequately bonded to 
the chassis of the computer.  I had a similar distortion issue on my K3 
audio, and I had to go all the way down to a 10 inch length of RG-8 coax 
braid for a bonding strap to make it completely go  away.

73,
Dave   AB7E


On 9/10/2011 6:38 AM, Larry Draughn wrote:
> Just had my K3 for about a week need help with microphone, seems I have a
> hum or slight distortion using the Heil PR-40 and connected to rear mic
> port, any thoughts? Larry AE4LD
>
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