On 3/14/2018 1:36 PM, John Huggins, kx4o wrote:
I have personally seem a 40m signal change the channels on our Direct TV
setup. This is, unfortunately, a common problem...
https://www.google.com/search?q=direct+tv+amateur+radio+changes+channels&oq=direct+tv+amateur+radio+changes+channels
Problems like this are the result of design defects in the cable modem.
It should be possible to solve problems of this sort by winding multiple
turns of both the coax and the power cable #31 or #43 Fair-Rite toroids.
See
http://k9yc.com/KillingReceiveNoise.pdf
for part numbers and guidelines for winding. While the app note
discusses RX noise radiated from gear like this, the cures are the same
for both.
AND -- because it's the result of a defective modem (i.e. a bad design),
ALWAYS call the vendor and tell them to fix it.
73, Jim K9YC
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