[Elecraft] noise on SSB modulation

[Buck k4ia]

It is not a fan, it is RF or other noise getting back into the mic 
circuit.  I had the same problem.  Check the two mods on the Elecraft K3 
Enhancements and Application Notes page.  Look for Older K3 Mods > 
"Front Panel Microphone" and "Improving the Immunity of the real panel 
RS232 and audio connectors" to see if they apply to your rig's serial 
number.  Do both to solve your problem.


Buck
k4ia
K3 # 101

On 9/23/2011 6:39 AM, DK5EW wrote:
> Hi all,
> I use at my K3 a HEIL PRO SET ELITE "IC", I had this as I use it at my
> old ICOM IC-275H as well.
> Now I recognised that I have a small noise on modulation like a fan that
> gives me some power output when I just push PTT.
> OK I have in my shack 2 additional fans for cooling the PA so I switched
> them of. The noise is lower but still there.
> and there are no other noise sources. So my setting for the HEIL headset
> are:
> - MIC: 25
> - CMR: 25
> - MIC SEL: RP + HIGH BIAS
> - MIC+LIN: OFF
> Do you have any idea if I can change setting to cancel that noise ?
> I can not believe that the microphone is that sensitive to pick up all
> little noises around.
> best regards Erwin/DK5EW
>
>
>
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