[Elecraft] noise on SSB modulation

[DK5EW]

Dear Buck,
thanks for your tips but I'm not sure if I have to do any mor because my 
K3 is brand new !
It came 05.September 2011 and has serial 5776.
73's Erwin/DK5EW

Am 23.09.2011 13:24, schrieb 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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