[Elecraft] k3 switching supply

[Ignacy]

All switching power supplies emit something but whether their noise is heard
or not depends on antennas. The noise is heard more with very close antennas
and not all all with those farther away. Also more with unbalanced antennas
especially is coax is part of the antenna system. 

There are many noise emitting sources that usually do not bother K3. For
instance, P3 emits very strong noise when checked with antenna close to it.
But I cannot hear any noise from P3 using my external antennas. 

I used MFJ 4125 and 4225. They generate weak moving streaks on P3 at my QTH,
but no problem.  Jetstream JTPS31MB is smaller and a bit quieter.

Ignacy, NO9E




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