Hi Mike,
Thanks for the video and the link. I stopped watching by the time you
were looking at 40M. Some criticisms -- 1) there's no information about
antennas in use, or how close they were to the shack. 2) The frequency
display is not set to average the signal, so it's much harder to
distinguish noise like that from a SMPS. 3) The amplitude display was
not set so that band noise produced a line very close to the bottom of
the display, and the waterfall was near black on band noise. Such
settings, combined with averaging, make it much easier to distinguish
electronically generated noise.
In my testing of switching power supplies, I usually hear little if any
noise on antennas that are 200 ft from the shack, but a TON of noise on
a 160M vertical that is 25 ft from the shack. I suspect most hams have
antennas that are in the range of 25-50 ft from the shack. That was my
situation in Chicago.
73, Jim K9YC
On Sun,8/7/2016 9:45 AM, Michael Coslo wrote:
I have produced a video on my YouTube channel regarding testing of a Switching
Power Supply to ascertain potential RF interference. This particular test is
of an Alinco DM-330MV and the radio is a Flex 6300. Note this is a test under
normal conditions that an amateur might experience. Enjoy.
https://www.youtube.com/watch?v=R8p5WUAriBo&feature=youtu.be
p.s. if anyone knows of a wall wart type supply that has proven to be a
problem, I would love the name in order to perform similar tests.
-73 de Mike N3LI -
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