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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