Andrew VK3BFA wrote:

Never said there were no quiet switchers - just that the majority were
not....Google on SMPS noise to prove.....

Sure... but SMPS noise is categorically NOT about "the luck of the draw"
(as you claimed a few days ago).

It's all about skill and care in the design - above all, the input and
output filtering. Done correctly, there are no problems, as proved by
the many base-station HF transceivers that have a mains SMPS built in.

When you buy a separate SMPS, don't trust to luck. Be an intelligent
consumer: read the reviews, specify what you need, ask what has been
done to minimize the noise levels, and be prepared to return the unit or
walk away.

The only real "luck" is about the SMPSes in other things that your
family and neighbours may buy...


--

73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek