[Elecraft] 10M birdie and other assundries

[Michael Pfeuffer]

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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