[Elecraft] 10M birdie and other assundries

[Michael E. Dobson]

I don't know how reduced it is because I haven't compared it to the 
KPA100 as the top lid but it is barely noticeable in my K2 with the 
KPA100 in an EC2 unless I have the preamp on.  Even then, it is more 
a nuisance than a problem unless the signal is very weak.

73,
Mike WA3KYY

At 11:58 AM 12/19/2006, you wrote:
>Anyone know if remoting the KPA100 to an EC-2 case reduces the birdie?
>
>--Mike
>
>
>At 10:32 AM 12/19/2006, Vic K2VCO wrote:
>>J F wrote:
>>>Just out of curiousity, after spending some time on
>>>10M during ARRL 10, I noticed a birdie around
>>>28.019/20. Is there a way to eliminate this or move it
>>>below 28.000?
>>
>>Yes, but even I haven't had the guts to implement it.
>>
>>Replace the diode t/r switch with a reed relay such as the 
>>Matsushita RSD12V.    Reduce the power level of the bias oscillator 
>>and remove the high voltage multiplier section so you can get -12v 
>>for the RS232 interface with less stray RF floating 
>>around.  Alternatively, find a way to power it from the computer 
>>(and some RS232 ports will apparently work without the -12v at 
>>all), so the bias oscillator can be completely disabled.
>>
>>I tried various forms of shielding, filtering and bypassing without 
>>success.  A friend pointed out to me that the birdie is a result of 
>>mixing between VHF harmonics of this and another oscillator in the 
>>K2, so that explains why it's so hard to kill.
>>--
>>73,
>>Vic, K2VCO
>>Fresno CA
>>http://www.qsl.net/k2vco
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