[Elecraft] switching power supplies

[lhlousek]

<<It would be interesting to hear from people for whom the switchers HAVE NOT worked well.>>

I have tried 7 or 8 different switchers from 1.5A wall warts, to little laptop bricks, to 30A shack supplies.  Most work
well in the shack with good grounds, remote coax fed antennas, etc.  All, except one, have produced some noise when
using field expedient antennas like end fed wires, close in dipoles, and whips with counterpoises, even those advertised
as not producing noise.  The noise is generally a broad band of hash that drifts into your QSO at the most inopportune
time.

The big Elpac switcher I have has never produced noise although it is a big as some comparable linear supplies. It is
lighter.

I built a little linear supply for my K1 based on an unregulated DC wallwart and low drop-out V-reg that has worked FB.
For the K2 I use the Elpac or one of the less heinous among the small switchers.

Lou W7DZN