I should mention that these treadmills came up on another forum as the culprit
for nuisance tripping of GFI circuit breakers with arc fault detection. The
treadmill is generally an unregulated device. In a similar way as brushed
electric drills and other household appliances that are intended for
intermittent use.
Doug
Original Message
From: Doug Powell
Sent: Friday, February 26, 2016 11:45 AM
To: David Robbins; rfi@contesting.com
Subject: Re: [RFI] treadmill noise
David
This is a very low frequency for an EMI filter, most of those are useful down
to the low 100s of kHz. You may have to look into some sort of a low pass line
filter, or look into making one of your own. Sometimes a lot of that noise can
be removed with an isolation transformer and snubber network on the side of the
transformer that has the appliance.
Best of luck, Doug
Original Message
From: David Robbins
Sent: Friday, February 26, 2016 11:35 AM
To: rfi@contesting.com
Subject: [RFI] treadmill noise
When turning on for the 160m contest I had strong stable noise spikes every
15khz across 160m. Checked everything in the house then went for a walk
with my grundig g5. It was much stronger at the power pole so picked left
and started up the road that way. it slowly got stronger as I approached the
next house about 1000' up the road and was much stronger at their pole. The
couple was home so I went and let him hear the noise and asked if they got
anything new recently, nothing. then asked if anything was running that
wasn't on all the time, she was on their treadmill.. Shut it off, noise
gone. The treadmill is a ProForm ProTech 3. Anyone have a good line
filter for a treadmill??
David Robbins K1TTT
e-mail: <mailto:k1ttt@arrl.net> mailto:k1ttt@arrl.net
web: <http://wiki.k1ttt.net/> http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or <telnet://k1ttt.net:7373>
telnet://k1ttt.net:7373
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