Colin, Nick et al,
I avoided taking the openers apart until I was done dealing with
Chamberlain so they could not blame any problems on me.
I used the Mixture 31 toroids because I already had them. I'm very
willing to order some Mixture 75s.
I ran into another ham on the Flexradio community website who had the
same problem with Chamberlain garage door openers. He tells me that
with the bypass caps and some extra wire wound through a mixture 31
toroid his problem was fixed. He wound through his snap on toroid with
all the turns overlapping. I spaced mine evenly around it. His was
just a red and black pair, might have been from a power cord. Since I
needed 4 wires I stripped 9 feet of cat 5 apart and took two of the 4
twisted pairs. I put one end of both of them in a vice and the other
end in my cordless drill and made a twisted pair of two twisted pairs,
then wound that through the toroid.
I then rewired all connections from both openers with cat 5 just using
single pairs from the cat5 as I needed them, without removing the other
3 twisted pairs. I used the cat 5 in the hope that I would get some
attention from the twisted pairs in it, and I had lots of it.
All this work did help but not near enough.
I do not know what frequency he was having a problem with. It may not
have been BCB and 160m. I will email you each photos of the spectrum
display on my Flex I took with the openers powered off, then a before
and after pic of the of the same display. If you look me up on
www.QRZ.com you can see how close my 160m Inverted L is to the garage
with the openers.
For now I am getting along by walking out to the garage and tripping the
breaker that feeds the openers.
The noise is so bad that I have a hard time believing Chamberlain when
they say they are within the RFI limits imposed by the FCC.
I've got out of town guests coming tomorrow for a few days. After that I
will see how difficult it will be to open up one of the openers and see
how hard it would be to disconnect their piece of junk PS and hook up my
own.
Steve NG0G
On 9/14/18 2:27 PM, R. Colin Newell wrote:
Exactly what I did with a brand new CISCO WIFI router — they used a 99 cent
Chinese switching supply that was butt ugly across the LW and MW BAND for a 100
yard circle!
Imagine: one freaking wall wart blaffing 4-6 urban properties. That’s criminal.
Anyway - I replaced it with a quieter switching supply and messages to CISCO
were ignored. Reported it to my TELCO. Any TELCO that says they are in
compliance are lying.
To quote The Beastie Boys... “Ya gotta fight for your right to DX!!!”
Colin Newell - Victoria - B.C. CANADA -
On Sep 14, 2018, at 12:14 PM, Nick Hall-Patch <[email protected]> wrote:
Have you tried using type 75 cores? Type 31 is specified for somewhat higher
frequencies than #75.
Also, is the switching supply the actual source of the problem? If so, is it
possible to replace with a less noisy one, or is it integral to the unit?
best wishes,
Nick
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Stephen Hawkins NG0G
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