[RFI] Chirpy Drifter

Joe Wolfe w7rkn.7 at gmail.com
Fri Jan 29 19:04:59 EST 2016

Say I've heard that sound, but I do have a 5 kc 'growl' that moves up and
down the band.  I thought it was me, but I was on a remote, 150 miles away
and danged if I didn't hear it there as well!

Doesn't happen but maybe 3-5 times a month, in the morning.

So, once this 'chirping' is fingered out, it might point me in the right
direction to find my 'noise'.

Joe - W7RKN

-----Original Message-----
From: RFI [mailto:rfi-bounces at contesting.com] On Behalf Of Don Kirk
Subject: Re: [RFI] Chirpy Drifter

Hi Kris,

The chirp is kind of unusual, but I wonder if it's someone on a piece of
exercise equipment?  Kind of slow for a treadmill, but maybe not for a stair
stepper or rowing machine, etc.  When I see/hear 14 khz repeating signals of
that nature (but not so chirpy) it's often related to a variable speed drive
located in a piece of exercise equipment.  The periodic increase in
intensity is usually when the variable speed drive is under a varying load
such as when someone has put his foot back down on the treadmill, etc.

More information about the RFI mailing list