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<Meino.Cramer <at> gmx.de> writes: |
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> > media-sound/qjackctl http://qjackctl.sourceforge.net/ |
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> And master James moved slightly and asked a simply question. |
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> Suddenly the novice was enlighted. |
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> He answers "It is used for my PC." And after a while he added: |
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> "I want to decode sstv and weather fax." |
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SSTV? really? now you are just teasing an old (EE) fart? |
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That's a real application, it just hard to keep the sync bit stable..... |
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> And in the distant a little radio whispers |
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> "Di da da di di da da da di da di di". |
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Once (in my youth) I dated a young, friendly lass, named 'Candy Morse' |
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do da da do da da..............! |
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> And the fog raises and everything becomes clear as it was in |
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> the beginning. |
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This is unknown to me; but you might find help if you get sstv audio |
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signals parsed out of your serial line signal, if I am to speculate |
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what you are really after? You may need a spectrum analyzer to identify |
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and isolate the audio signal since the signal is a superposition |
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(hybrid) signal. It might be best to filter the audio signal out |
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in the Rf domain, as opposed to it's digital derivative signal. |
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http://users.belgacom.net/hamradio/index.htm |
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under software he has rx-sstv for windoz. Get it working under doz |
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and then hunt for a linux setup, using windows to verify it |
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all works (hardware wise) first, is one possible path. |
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Also : http://www.dxatlas.com/SstvTools/ |
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and in portage (just to be complete) media-radio/qsstv |
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Also verify the chipsets used (dongle?) and their reliability at various |
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frequencies. Those chipssets that are wideband, are always problematic, |
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imho........ Most of the crap (dongles) floating around are not very good. |
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Me, I'd go to the trouble to find a new chipset, including filters and |
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LNAs (low noise amplifiers) to build a decoder box. You could probably |
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sell them. If you go that route, drop to me privately. |
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Dowload PDF - Image Communication on Short Waves |
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www.sstv-handbook.com/download/sstv_04.pdf |
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good hunting! |
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James |
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