[Elecraft] noise on SSB modulation

[David Gilbert]

If you are using any kind of rig control with your computer (and 
therefore have a shield connection between the K3 and the computer, such 
as via an RS-232 cable), make sure the chassis of your K3 is securely 
bonded to the chassis of the computer with a very short length of large 
gauge wire or section of shielded braid.  I had to go down to less than 
a foot of RG-8 shielded braid to eliminate all hum on my signal.

73,
Dave   AB7E



On 9/23/2011 4:33 AM, DK5EW wrote:
> 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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>
>
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