[RFI] DC Power supplies
Jim Brown
jim at audiosystemsgroup.com
Mon May 9 01:10:15 EDT 2016
On Sun,5/8/2016 1:04 AM, Roger (K8RI) wrote:
> That quiet power supply is a Tenma 40A with adjustable voltage. It
> was sold by the same company that sells Rigol. I have A Rigol spectrum
> analyzer.
Hmmm -- the power supply in my Rigol puts out enough RF noise that I can
see it on an inductive probe. Rather disappointing if you're trying to
use it to evaluate noise in a product. When I discussed this with the
distributor at Dayton a few years ago I got a blank stare.
As to these supplies being "clean" -- how close are they to RX antennas?
I have a no-name supply that hams told me was clean, and it's a holy
terror on the 160M vertical that's 25 ft from the shack. Not so bad on
high dipoles, but the SteppIR 200 ft from the shack zeroes in on it on
some HF bands. And I've got it heavily choked and caps across in and out
terminals!
73, Jim K9YC
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