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fDesc[0] = "ComTekk AvCall makes use of the computer sound card and software DSP (Digital Signal Processing) techniques to decode and instantly display aviation SELCAL codes, a 2 2 tone signaling system used to &quot;page&quot; aircraft via HF (or VHF) radio on overseas flights.<br /> Simply connect receiver&#039;s speaker output to computer&#039;s LINE or MIC input.";

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