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  • 1991). "PACTOR—Radioteletype with Memory ARQ and Data Compression". QEX Magazine: 3–6. "Sail-mail e-mail service for yachts via Iridium, Inmarsat, or...
    11 KB (967 words) - 01:58, 5 January 2024
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    Hardcastle, Jack A. (Nov–Dec 2009). "Crystal ladder filters for all" (PDF). QEX Magazine. Newington, CT: American Radio Relay League. pp. 14–18. Poole, I. (n...
    6 KB (584 words) - 05:44, 27 September 2023