[Elecraft] Switching supplies and the K3

[David Woolley (E.L)]

Trevor Smithers wrote:
> supplies have no place anywhere near the ham shack - its bad enough the neighbours 
> having them all over the place but they don't know or care - we should know better.

But we should also know about conversion efficiencies, power factors and 
power line harmonics!

> 
> As an aside if anyone has any doubts about whether or not switch mode supplies cause 
> rfi get one of these devices and check it
> http://www.winradio.co.uk/home/erd.htm

Without a specification for near field sensitivity below a few hundred 
kHz, its difficult to be sure whether this is measuring anything useful 
in terms of radiated RFI.


-- 
David Woolley
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