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
At 17:24 2018-09-14, Stephen Hawkins wrote:
Gang,
I made a video taken from my pickup sitting in
the garage with the radio on and all you could
hear was noise. Then as I backed up and got
farther way from the opener the noise slowly
died down and you could hear the station that
had been covered with noise. I posted it to
the Chamberlain Facebook page. I emailed their
tech support team photos of everything. Their
response was that according to the FCC they are legal.
I stripped 9 feet of cat5 to make the RF choke
and took two of the pairs and twisted them
together and wound them through a mixture 31
toriod to make an RF choke. I also put a .01
cap from each lead to ground right where they
came out of the opener. I also mounted the
toroid as close as I could to the opener so that
there are only a couple of inches of wire before
the toroid. Still have problems.
Steve
On 9/14/18 12:09 PM, Russ Edmunds wrote:
Some opener companies have different sensor units which greatly reduce RFI
but you have to go directly to the mfr and ask.
I did that many years ago and have had none of that since.
Russ Edmunds
<[email protected]>
On Fri, Sep 14, 2018 at 1:00 PM R. Colin Newell <[email protected]>
wrote:
RF chokes!
I replaced my garage door opener with a new unit - whisper quiet.
Colin Newell - Victoria - B.C. CANADA -
On Sep 14, 2018, at 9:57 AM, Stephen Hawkins <[email protected]> wrote:
Patrick et al,
I have found the worst RFI generator I have heard in quite a while. We
had a nice garage built and the contractor installed two brand new
Chamberlain garage door openers. The RFI comes from a cheap, dirty
switching supply that uses the leads going to the sensors at the bottom of
the doors and to the switch by the people door as antenna. It ruins the
BCB and 160M. I tried to post a photo of the screen on my Flexradio
showing the interference but it doesn't get through. It is bad despite
replacing all the wires with cat5 and winding an extra 9 feet of twisted
pair striped out of the cat 5 through a Mixture 31 toroid. I have to power
them off at night.
I'll email photos to anyone who wants.
Steve NG0G
--
Stephen Hawkins NG0G
[email protected]
73 49 111 01001001
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Stephen Hawkins NG0G
[email protected]
73 49 111 01001001
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Nick Hall-Patch
Victoria, BC
Canada
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