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Loggings => Shortwave Broadcast => Topic started by: Asuyuka on June 20, 2012, 0359 UTC

Title: 14.080 mHz @ 0350 - Polyphonic data?
Post by: Asuyuka on June 20, 2012, 0359 UTC

Not so sure if oddity or unknown data type to me.  Detuned tones, over multiple aural frequencies.  Will post a video shortly.

ETA: Video.  Sort of quieter than I liked, but here you go:

http://www.youtube.com/watch?v=NEFpNNzkZ-E

Title: Re: 14.080 mHz @ 0350 - Polyphonic data?
Post by: refmo on June 20, 2012, 1116 UTC

That's JT65A mode, not quite properly tuned in.  Sounds kinda like an ice cream truck when its tuned properly :-)
It is a slow data mode, with each transmission beginning exactly on the minute, and lasting about 48 seconds.
Google it to find some free decoding software.

Title: Re: 14.080 mHz @ 0350 - Polyphonic data?
Post by: Asuyuka on June 21, 2012, 0503 UTC

Quote from: refmo on June 20, 2012, 1116 UTC

That's JT65A mode, not quite properly tuned in.  Sounds kinda like an ice cream truck when its tuned properly :-)
It is a slow data mode, with each transmission beginning exactly on the minute, and lasting about 48 seconds.
Google it to find some free decoding software.

Thanks for the info. :) I got MultiPSK (nightmare of a GUI, but handy), just not familiar with all types.  Thank you.  :D

Title: Re: 14.080 mHz @ 0350 - Polyphonic data?
Post by: Token on June 23, 2012, 2215 UTC

Try FLDIGI.  It does not quite support the number of modes of MultiPSK, but the GUI is a little cleaner.

Most transmissions inside the ham bands are going to be hams.  Occasionally there are other signals of interest inside ham bands, but most of the time it is hams using one of the many, many, modes they have.  A guide to US ham bands (and a good worst case world wide guide) here: http://www.arrl.org/files/file/Hambands_color.pdf

Just an FYI, digital signals almost always fall in the "utility" sub-group of short wave listening (utility can be thought of as basically everything in the SW range except SW Broadcast of things like music and news), and might get a better response if posted in the “Utility” forum rather than the Shortwave Broadcast.  Since many of the people on that forum are also on this one, maybe it really does not matter ;) , but there is a forum for those kinds of signals.  Also note that there is a separate “Spy Numbers” section, and a separate “HF Beacon” section, as they are special cases of what might be called Utility.

T!