Slava,
I can't make the link work but regularly spaced signals are a classic
sign of a Switched Mode Power Supply [SMPS]. I host the local wireless
company's RAP for our neighborhood on my tower, in return we get the
backhaul speed [17 Mbps] for free ... yes, we power it. Really great
for Andrea's Netflix addiction. They recently replaced the gear, and it
is now powered by a UPS in our shed with an SMPS with raucous noise
peaks every 26 KHz +/-, they move around a bit. Since the wireless
company seems to be preoccupied with getting new customers, I'm going to
wind a couple of toroid chokes and see if I can fix this.
Wall warts are in most cases these days SMPS. So are LED lamp power
supplies. I'll send you a screen shot of mine if you'd like, their UPS
is connected to a cable to the top of the tower and down to the router
at the bottom ... resembles a 160 Inv-L.
73,
Fred K6DGW
- Northern California Contest Club
- CU in the 2014 Cal QSO Party 4-5 Oct 2014
- www.cqp.org
On 4/8/2014 6:34 PM, Slava Baytalskiy wrote:
Hello everyone!
I'm not sure if this is the correct forum for this sort of a question but i
figured i'd give it a shot.
I've been going out of my mind with this strange signal pattern i've been
seeing on my new panadapter connected to my new K3.
I first saw it on 20 meters. It seems to be the same signal pattern, spaced
evenly, at 61 kHz intervals.
Something tells me that it could very well be outside of my shack. I've got the
street power lines 15 feet in front of my house, with a big transformer on top
of a pole.
I just took a video of the whole thing and you can also hear the sound of it,
especially while i tune it up and down.
Here's a link to the video file in my DropBox:
https://dl.dropboxusercontent.com/u/111549/rfi/strange_rfi.wmv
Sorry for the format. This screen capture program only does Windows Media Video.
I've gone to a point where i've disconnected everything in the shack.
Literally. And i could still hear it.
My Yaesu 857D also hears it, with the same antenna hooked up to it, so that
tells me its not my K3 or the panadapter (for that matter).
I also tried hooking up another antenna (i have a home made fan dipole) and i
can still hear it. So its not the antenna (right?).
I'm very open to any suggestions as to what to do? How to narrow it down?
Thanks a bunch in advance!
Slava, W2RMS
P.S. I almost wish i didn't have the panadapter, so i wouldn't even know its
there... :-(
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