Amateur Radio Stack Exchange
Amateur Radio Stack Exchange

Questions tagged [signal-identification]

Questions about identifying signals of unknown mode or origin.

If your question asks about a recording of an unknown signal, or a snapshot of a waterfall display, then this tag fits. This tag also covers topics like numbers stations.

The Signal Identification Wiki is an excellent resource for trying to identify signals based on their sound and/or appearance on your .

43 questions
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What type of signal is this?

I received this signal around 7 MHz. I've checked all over the "Signal Identification Wiki", but cannot find anything similar to this. I'm pretty sure this is some simple FSK, but that is the exact type? The signal is at around 2200Hz (in audio…
Risahas
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Zigzag line on CB band

I'm seeing this strange signal on the CB band around 27 MHz, at a glance it looks similar to NFM modulation, but it's just noise when tuned to. It's transmitted about every minute. My setup is RTL-SDR with Nooelec NeSDR and a "noise-cancelling…
MightyPork
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What's this digital mode on 40 meters?

Location: Michigan, USA Frequency: 7.074 MHz Time: 1300 UTC Vertical axis: 15 seconds per division Most of this is FT8, and some JT65 can be seen as well. But buried in here is something else, labeled "A". It appears to be some kind of 8-FSK,…
Phil Frost - W8II
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What modulator is used on this audio file? (it should be ASFK1200, but not recognized)

I have this audio file (WAV) that I'm trying to decode using multimon-ng (also tried Qtmm AFSK1200 Decocoder). It should be using AFKS1200 but multimon-ng can't demodulate it and by the looks from the frequency analysis it doesn't quite match other…
Chris8580
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