HFU HF Underground
General Category => General Radio Discussion => Topic started by: UtilitySeattle on November 22, 2022, 2322 UTC
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I often see stuff on the boards like "Detected KG-84C SYNC with 100% confidence" or folks clearly labeling different types and modes of digital signals and I often wonder what folks are using to measure and identify these signals.
TIA
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I do not get into digital signal monitoring much, but the Signal Identification Wiki has lots of info.
https://www.sigidwiki.com/
On the software side, there is the open-source ARTEMIS signal analysis software with over 400 signal types currently in its database.
https://aresvalley.com/Artemis/
I suspect there are more than a few around here that can probably ID dozens of digital signals by just listening.
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Well, 40+ years of listening for me. I used to heavily rely on my monthly issue of "Monitoring Times" way back when but now rely on what others post and some of the blogs on the Internet. I see an interesting post and I go listen and learn.
The Signal Identification Guide at the Sig ID Wiki is good:
https://www.sigidwiki.com/wiki/Signal_Identification_Guide (https://www.sigidwiki.com/wiki/Signal_Identification_Guide)
As for my post with "KG-84C SYNC with 100% confidence" that is purely experience. Encrypted RTTY has a certain cadence to it. The "sync" is transmitted with a series of RYRYRYRYRY. It becomes obvious when you listen to it for long enough.
As for the actual decode, I generally use Sorcerer. I will also use multi-psk or fldigi and just sit there and transmit in all of the various modes and learn what they sound like. There are some real gurus out there and like I, they hang out at the UDXF groups.io.
In my opinion, Antonio happens to be one of the best, and very technical in nature, and you can find his extensive blog at:
http://i56578-swl.blogspot.com/ (http://i56578-swl.blogspot.com/)