[RFI] What would cause noise like this?

Jim Brown jim at audiosystemsgroup.com
Sat Nov 2 05:21:16 EDT 2019

Hi Frank,

Since I can't read any of the axis calibrations, I have no idea what I'm 
looking at -- i.e. what band, what calibration of the frequency axis.

73, Jim K9YC

On 11/1/2019 4:25 PM, Frank O'Donnell wrote:
> Hi all, new to this list, hoping to learn enough to chase down some of 
> my yet-unsolved RFI issues.
> As a start, I'm wondering if the way that RFI I saw the other morning 
> appeared in the receiver's waterfall might suggest anything about what 
> the source of noise could be.
> Here are two brief video clips from SDR Console, displaying a waterfall 
> covering the LF/MF spectrum with input from an Elad FDM-S2 SDR and 
> broadband vertical antenna.
> The first clip is at 6:08 a.m. PDT, exactly one hour before local sunrise:
> https://vimeo.com/370416556/e3cf9bcb09
> At 00:23 of that clip, a pattern of heavy RFI starts, with lines in the 
> waterfall spaced ~16 kHz apart (approx 6 lines per 100 kHz).
> A couple of minutes later, I noticed that the RFI started toggling, with 
> the pattern changing for a second or two, and then the RFI disappearing 
> briefly before restarting. In the following clip this pattern starts at 
> 00:09:
> https://vimeo.com/370418392/afb0a0c4ef
> Any thoughts? We live in a suburban neighborhood where lots are all 
> approx 50 x 200 feet. There are at least two houses with solar panels 
> within ~200 feet of us, and more down the block. I gather that RFI from 
> solar panels can vary, based on the type of system and the deficiency 
> responsible for the RFI. Do these clips show any kind of visual 
> signature that might suggest the source?
> Thanks and 73,
> Frank K6FOD
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