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http://lists.contesting.com/archives/html/WriteLog/2005-10/msg00137.html
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http://hackaday.com/2011/07/19/jeri-ellsworth-builds-a-software-radio
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http://www.wm7d.net/fcc_uls
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http://websdr.ewi.utwente.nl:8901
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https://f6itu.wordpress.com/2017/07/20/vfo-do-de-w3pm-prcis-et-pas-cher
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http://radiof6kfa.free.fr/rep_site_kfa/html/technique_1.htm
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http://www.rtl-sdr.com/transmitting-f...sstv-and-fsq-with-just-a-raspberry-pi
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http://www.roue-libre.be/article.php3?id_article=100
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https://en.wikipedia.org/wiki/Traffic_message_channel#France
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http://www.giangrandi.ch/electronics/tandemmatch/tandemmatch.shtml