Strange signal?

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lordkev
Posts: 1
Joined: Sun Jan 24, 2016 10:53 pm

Strange signal?

Postby lordkev » Sun Jan 24, 2016 11:09 pm

I am seeing the following signal throughout the spectrum all the way from HF (10m, 6m) up into VHF (2m). It appears to be some kind of timecode signal. I thought it was a harmonic, but it's definitely quite strong even up in the 2m band. Any idea what the source might be?

Image
Last edited by lordkev on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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GrahamC
Posts: 21
Joined: Wed Jan 27, 2016 4:59 pm

Re: Strange signal?

Postby GrahamC » Thu Jan 28, 2016 2:47 pm

Hard to tell from what you have posted.

However, from your description and screenshot if I was to make a guess, it looks like the type of RFI / EMI you will see from wired ethernet/networking. You will find this type of EMI / RFI from HF through VHF at regular intervals and has a repetitive sound and pattern.

Putting clamp on ferrites on the cables near your routers, computer, and the SDRPlay may help, it all depends on how the RFI/EMI is finding it's way into your receiver - i.e. through your antenna or through your cabling as common mode. If you are using a simple whip antenna on your SDRPlay you might try using a longer piece of cable and separating the receiver and antenna by some distance which may help reduce the level of the interfering signal.

EMI - Electro Magnetic Interference
RFI - Radio Frequency Interference

cheers, Graham
Last edited by GrahamC on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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