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Shortwave Data Decoding - Discussions regarding decoding digital signals on the HF bands, including HFDL, ALE, RTTY, CW, and others.

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Old 11-20-2011, 6:20 AM
Join Date: May 2011
Posts: 108
Default Odd Digital on 8680 USB

I was tuning around between 8 - 9 MHz tonight around and stumbled across something I hadn't heard before on 8680 kHz around 0000z. Can someone identify what this might be?

Poor recording:

Warning--it's about 3MB.

It's still going on as I type this.

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Old 11-20-2011, 5:00 PM
Join Date: Jun 2010
Location: Mojave Desert, California, USA
Posts: 1,940

HF Fax or Weather FAX, WEFAX. Probably NMC USCG.

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Old 11-20-2011, 5:02 PM
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Mike you might be able to make a semi-educated guess as to the mode by comparing your recording to known recordings of digital signals. This wiki article has several links for this purpose...

HF Digital Decoding - The RadioReference Wiki

Many folks who fool around on digital also have the capability to view the audio waveform - it's not 100% accurate, of course, since local conditions and the receiver might introduce unwanted traces, but it's another tool that people can use. Many packages have the ability to generate the waveform just by feeding the audio into your PC and letting software do the work. MixW can do this, and I'm sure there are a great many others.

Although a lot of these type of packages are ham-related, don't ignore their potential usefullness in being a regards..Mike
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