[Elecraft] Switching P/S Horror Stories

[Vic Rosenthal]

lhlousek wrote:
> 
> Based on the QST review I bought an Alinco 25A switcher.  It's a very nice supply with adjustable voltage, voltage lock,
> meter, small size, etc.  Works absolutely FB...except for 80m.  It generates noise and birdies all over the 80m band.

I have had noise problems with switchers as well.  What I want to know is "why
is it so hard to filter/bypass these supplies to get rid of the noise?"

I'm old enough to remember the advent of TVI and the development of TVI
suppression techniques for homebrew and commercial rigs.  Why can't we take a
similar approach to switching power supplies?

73,
Vic, K2VCO
Fresno CA