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ARRL Products: Digital Communications (More) ARRL's VHF Digital Handbook -- Dive into the digital radio universe! Nifty E-Z Guide to PSK31 Operation -- Now Shipping! -- A complete guide for implementing PSK31! Morse Code for Radio Amateurs -- Includes a free CD of audio and computer programs. Digital Signal Processing Technology -- Essentials of the Communications Revolution. An understandable presentation and reference on DSP in contemporary communications technology. The ARRL Digital Technology for Emergency Communications Course -- Now Shipping! -- CD-ROM. Learn all the ways to use digital technology as an emergency communications tool!

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