[Elecraft] Switching v. Linear Power Supplies

[Rick Lellinger]

Greetings,

I've been working with electronics as a hobbyist for over twenty years and
I've always powered my projects with linear power supplies.  I no longer
have access to my heavy 30amp Astron supply and I'm considering an MFJ 13.8v
25amp (#4225) switching supply (reduced weight and size). It will power both
my K2 and a VHF radio. However, I am concerned about RF hash from the unit
as well as ripple. I noticed that the MJF supply has a ripple figure of 35mv
while a comparable Astron linear supply has a mere 5mv of ripple. The
voltage regulation is fine, which is good.

1. Has anyone used the MFJ 4225 switching supply with good results, that is
decent regulation and NO hash (Rx OR TX) ?

2. Is 35mv of ripple too high? I know that the K2 and most good radios
contain excellent voltage regulating circuitry and so this may not be an
issue.

Thanks

Rick L