On 12/22/2021 11:07 AM, David Eckhardt wrote:
Ultimately,
an aggressive line filter (Corcom or equivalent) was installed with the
case of the filter bonded to the metal support of the opener, itself, and
that in turn bonded to the "ground" of the opener circuitry.
A multi-turn ferrite common mode choke wound on a #31 toroid or through
a #31 clamp-on would have likely solved the problem. #43 is the wrong
mix below about 100 MHz.
http://k9yc.com/2018Cookbook.pdf
http://k9yc.com/KillingReceiveNoise.pdf
We also had
to install several ferrites (43 material) with several turns through each
on the lines going from the opener to the sensors at the bottom of the
garage door opening.
73, Jim K9YC
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