The ARRL Digital Technology for Emergency Communications Course -- CD-ROM. Learn all the ways to use digital technology as an emergency communications tool!

Digital Communication Systems Using SystemVue -- An essential guide for anyone wishing to understand digital communication systems through simulations using SystemVue.

ARRL's VHF Digital Handbook -- Dive into the digital radio universe!

Digital Signal Processing Technology -- Essentials of the Communications Revolution. An understandable presentation and reference on DSP in contemporary communications technology.

Nifty E-Z Guide to D-STAR Operation -- The first comprehensive reference to the world of D-STAR operation!