On Tue, 24 Jul 2012 11:30:53 -0400, "Ralph Mowery"
wrote:


wrote in message
.. .
I hooked up a switcher to a cb radio, very horrible noise which also
made
the circuitry act funny. With the application of 4 more ferrite
devices, I
got it usable.

Fix your radio.

Nothing wrong with radio. The switcher was not designed for radios.

If the radio won't work with switcher noise it won't work in any noisy
environment, either. If it isn't broken, it's crap.


Some switching supplies generate a lot of noise that is in the radio
frequency area. They will power devices fine, but at the same time if you
want to receive something that some of the RF noise appears on, there will
be a problem. Some of the battery chargers around the house RF generate
noise even when not charging a battery.

If that's affecting your radio, throw it away and buy a better one.

Some small fans such as in a computer that work on DC have an internal
switching supply of sorts that can also generate RF noise over a wide
frequency rnge.

Ditto.