Posted: 9/24/2014 7:18:11 PM EDT
I have the HackRF hooked up to a large lowband groundplane out back. I will often see these streaks at times but they aren't constant. They all appeared about 15 minutes ago suddenly. One seemed as if it was one of the swept propagation beacons but it stopped at 28.400 then kind of wavered back and forth until it locked on to 28.400 for a bit then disappeared. Does anyone have any ideas what this stuff is?
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Does your SDR have any bandpass filtering?
Without preselection, noise and strong images of other nearby stations can cause strong interference. Also lots of your home electronics, wall chargers, power supplies will spew RFI for your receiver to find too. 
A wideband SDR without a preselector/bandpass filter will give you a visual effect similar to what you are seeing. |
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Drift from something that's not frequency controlled (or has really bad frequency control.)
Sometimes you see something similar to this on UHF, and that's doppler from signals bouncing off of planes. However, I picked a couple signals from your waterfall, and they drift about 100 KHz, and it would take something moving at about 2,200 MPH to get a drift like that... so unless SR-71s are using CBs to communicate, I'd go with the drifting power supply hypothesis. |
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Just stumbled across this: http://www.ominous-valve.com/squiggle1.jpg Looks like the same thing you're seeing. Found it here: http://www.ominous-valve.com/uteworld.html |
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Ionosonde
An ionosonde or ionospheric sounder (colloq. chirpsounder), is a specialized radar system for the examination of the ionosphere. An ionosonde is used for finding the optimum operation frequencies for broadcasts or two-waycommunications in the high frequency range. I wonder is this is some of what we hear or see? 
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