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I've observed a signal I'm unfamiliar with, and am wondering what it might be:

The period of time it lasted is 5 seconds, and it occurs irregularly. You might be able to see it too via WebSDR.

How would I discover what type of signal this is, generally, and does anyone know off the top of their head what it is?

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One possibility is Digital Radio Mondale (DRM), but given that it's only five seconds long each time - exactly - I'm not sure. It does consume the same 10kHz bandwidth, and has some pattern similarities.

Here's one resource for visual signal identification: http://www.rtl-sdr.com/signal-identification-guide/

Digital modes are given a pretty thorough treatment with included waterfall signatures here:

http://hfradio.org.uk/html/digital_modes.html

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