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ARRL Products: Help for Beginners (More) Understanding Basic Electronics -- This book provides a stepping-stone to learning electronics. With the foundation it helps you create, you'll be ready to learn more advanced concepts. Basic Antennas -- Now Shipping! -- An introduction to antennas--basic concepts, practical designs, and easy-to-build antennas! The ARRL Ham Radio License Manual -- All you need to become an Amateur Radio Operator. Get your FIRST ham radio license! US Amateur Radio Bands - ARRL Frequency Chart (50 pk) -- 50 pack. Full color, size 8.5 x 11 inches. Getting Started with Ham Radio -- Get on the air now! A guide to your first Amateur Radio station.

This is a one-stop Web site for technical characteristics called for in FCC rules § 97.309(a)(4), which reads:

(4) An amateur station transmitting a RTTY or data emission using a digital code specified in this paragraph may use any technique whose technical characteristics have been documented publicly, such as CLOVER, G-TOR, or PacTOR, for the purpose of facilitating communications.

• CHIP64 (61,588 bytes, PDF file)
• CLOVER
• CLOVER-2000
• D-Star (225,010 bytes, PDF file)
• Domino
• FDMDV (PDF)
• G-TOR
• JT65 (114,422 bytes, PDF file)
• MFSK
• MT-63
• Olivia (Draft specification provided by the creator of Olivia, Pawel Jalocha, SP9VRC)
• PACTOR
• PACTOR-II
• PACTOR-III
• PSK31
• Q15X25
• RWOP
• WINMOR (PDF)