[Elecraft] RFI Getting into Power Supply.

[Steve & Anne Ray]

I had a problem with RFI getting into my power supply. I used a Astron 10A
for my K2 and KAT100 and a Astron 20A for my KPA100.  The KPA100 and KAT100
are in the EC2 case.  When I was on 80 meters, either QRP (Astron 10A on and
Astron 20A off) or QRO (Astron 10A and Astron 20A both on), I was putting
out a very raspy signal. Anything above 2 watts did it. It even did it with
a dummy load on. Note it was only on 80 meters. I tried another power supply
(cheapie bought at a hamfest), that could only put out 2.5A and it cured the
problem.  I have since rewired my power supplies so my Astron 20A runs the
K2, KAT100 and KPA100 and I have not had any problems.  One of these days I
will see if improving the filtering on the Astron 10A cures the problem.

A special thanks to Gary at Elecraft who suggested I try another power
supply.

72,

Steve Ray K4JPN ex K1VKW
EM82ep Warner Robins GA
Elecraft K2 1422 & KPA-100
Heath Fan HW-101, HW-8