Bill,
My own treadmill causes severe interference here in the house. I'm the only
one who uses it so it does not affect my own radio but it blanks out any AM
radio in the house that happens to be turned on. I reduced the noise to an
insignificant level by simply plugging a few microfarads of
Hi All,
I had mentioned previously that I just ordered a nice treadmill after a lot
of research. When I read about this possible interference I sent an email
to the company. Within an hour I got a phone call from a very knowledgeable
person. He stated that as far as he knows all treadmills
Very interesting. I own a Precor treadmill. I just went down and
tested it. No interference at all on 20. Didn't check anything else.
Didn't pay $4500 for it either. Got it from a dealer friend of mine.
It was a new one that never worked so it sat in the warehouse. He
said I could have
If it were me I do not think I would furnish or propose any home made
device as a solution.
Were there to be a failure in the treadmill shorty thereafter you can be
sure where the blame
would be placed. A really worse case scenario would be a fire. Then
it would be a let the law
suits begin
Hi David,
I don't know if treadmills are FCC Part 15 devices. I have not found the FCC
statement in the manual for the treadmill I ordered. Part 15 devices are
allowed to radiate as long as someone doesn't complain of the RFI to a
licensed service. If that happens try to convince your neighbor
Bob,
You are so right about that. I might further state that anything which
plugs into the AC outlet must have UL or other testing lab approval
stickers on it, so giving a neighbor an unapproved homebrew device opens
to door for liability.
73,
Don W3FPR
Bob wrote:
If it were me I do not
I would look around for some type of commercial line filter that could
be placed in the line.
Before purchasing a line RFI/EMI filter, the noise path and manner of
propagation requires investigation. If RFI radiation is occurring as a
result of coupling from a power supply or display
Well ... a 2 horse motor (output) will be consuming about 1.5 Kw if
operating at its maximum rating. Even if not maxed out it is likely to be
well over the ratings of any commercial line filter that we are likely to
find.
Localizing the source is no problem. It is the treadmill. If the
Thank you Elecraft reflector members for all of the great suggestions on this
QRN problem.. With your help I was able to locate the problem. I would of
not found it without your help.
Now, I have no idea what to do about the issue, perhaps nothing. I now know
the source.
It's my neighbors
We have a treadmill and it DEFINITELY radiates noise. It produces a 20/9
signal on my Icom 706 truck when I am sitting in the driveway and my wife is on
the treadmill. As I drive away, I can still hear the noise as it decreases in
strength until about 1 mile away where it disappears into the
The SCR motor controllers, as well as the tread
belts ... think Van de Graaff generator ... are significant
noise sources,
73! Ken Kopp - K0PP
elecraftcov...@rfwave.net
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Good treadmiils use a DC motor in the 2 HP Range. If they govern
the speed by driving the motor with a variable width pulse it might
explain why they are so RF noisy. Given all the unshielded wiring
between the controller board, the motor, and the display console it
is no small wonder they
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