http://www.ultranet.com/~sstv/

http://psk31.newmail.ru

http://aintel.bi.ehu.es/psk31.html

http://www.qsl.net/zl1bpu

http://194.163.169.146/~signals/TABLES/PSK.HTML#MT63

http://det.bi.ehu.es/~jtpjatae/sound.html

http://www.tbsa.com.au/~dsimp/

http://www.tapr.org/tapr/html/pktf.html

http://www.qsl.net/wm2u/

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