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GNU Radio Companion - Audio modem loop back test FSK
LTM Telemetry — Plane documentation
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CML FX419J 1200 BAND FFSK MODEM CDIP22 X 1PC | eBay
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G305 FSK Modem - G3 Technologies
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CMX469A -1200/2400/4800 Baud FFSK Modem - CML Micro
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internal multimode modem FSK/FFSK/GMSK P8502 | Manualzz
