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RFI caused by faulty Cable emergency backup power supply:
Cable Company RFICable company power supply
This turned out to be a power supply from the cable company. The unit was actually made by Alpha Technologies and it keeps the cable system “hot” during electrical outages. It was very irregular and identified via one-second “ticks” and about every two-minutes the frequency would shift for about 15-seconds and then shift again and the one-second ticks would return. I don’t know the native frequency as it “repeated” every 93 KHZ through wide swaths of the HF spectrum. Credit Alpha Technologies with eventually replacing this XM-2 Inverter Module with a “quieter” one.
RFI caused by an Electric Fence:
RFI Caused by Electric Fence
Video Player is loading.
Current Time 0:00
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Duration -:-
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0:00
Stream Type LIVE
Remaining Time --:-
1x
Chapters
descriptions off, selected
captions settings, opens captions settings dialog
captions off, selected
This is a modal window.
The media could not be loaded, either because the server or network failed or because the format is not supported.
Beginning of dialog window. Escape will cancel and close the window.
End of dialog window.
RFI Caused by Electric Fence
The popping you hear is the RFI created by an electric fence as it triggers the High Voltage pulse. If you watch the P3 you will see just how strong a signal it is… Pretty much all electric fences sound like this, a single pulse with some time then another single pulse. Most fences have about a 1-5 second pause between pulses.
Here is the same fence, as viewed on an Icom 7300:
Electric Fence RFI
Video Player is loading.
Current Time 0:00
/
Duration -:-
Loaded: 0%
0:00
Stream Type LIVE
Remaining Time --:-
1x
Chapters
descriptions off, selected
captions settings, opens captions settings dialog
captions off, selected
This is a modal window.
The media could not be loaded, either because the server or network failed or because the format is not supported.
Beginning of dialog window. Escape will cancel and close the window.
End of dialog window.
Electric Fence RFI, as seen on an Icom 7300
RFI caused by an Electric Blanket:
Grow Light and Electric Blanket, click to enlarge.
The horizontal lines are from an electric blanket about 50 feet from the antenna. The vertical lines are a grow light operation about a block away. All on 80 meters.
RFI caused by Ionosonde:
RFI from Ionosonde. Click to enlarge.
The sloping line is the Ionosonde as it moves across 40 meters. It will manifest itself an a single event woop, when you listen to it using USB/LSB.
i have a constant qrm on 40M. on a icom 7300 waterfall display it appears as 3 vertical sine waves. i have seen nothing like this in 60 years of hamming. i would like to send a short video/ audio clip for description. can i submit this? to what e-mail address? thank you; 73; bill WA6SZE
i have a constant qrm on 40M. on a icom 7300 waterfall display it appears as 3 vertical sine waves. i have seen nothing like this in 60 years of hamming. i would like to send a short video/ audio clip for description. can i submit this? to what e-mail address? thank you; 73; bill WA6SZE