The fully searchable digital edition of the printed book, as well as expanded supplemental content, software, PC board templates, and other support files.
System Requirements: The 2021 ARRL Handbook digital edition and expanded content (PDF files) are compatible with Windows 7, 8, or 10; Windows Vista or Windows XP, as well as Macintosh systems, using Adobe Acrobat Reader software. Acrobat Reader is a free download at
www.adobe.com. PDF files are Linux readable. Other included software is Windows compatible, only.