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ARRL Products: Digital Communications (More) The ARRL Digital Technology for Emergency Communications Course -- CD-ROM. Learn all the ways to use digital technology as an emergency communications tool! ARRL's HF Digital Handbook -- Join the Digital Race! 4th Edition. ARRL's VHF Digital Handbook -- Dive into the digital radio universe! The ARRL Software Library for Hams 3.0 -- CD-ROM, Version 3.0. Quick access to utilities, applications and information. Digital Signal Processing Technology -- Essentials of the Communications Revolution. An understandable presentation and reference on DSP in contemporary communications technology.

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