Cave electronics ebook

The Communications and Electronics Section (CES) of the National Speleological Society (NSS) released a new version of Speleonics, one of the few cave electronics magazines published.

Contents of number 27:

• Radio Slave for Flash (A. Beswick )
• 185 KHz Ferrite Core Antenna (P.R. Jorgenson)
• Radio Propagation Testing in Lava Tubes (J. Cardy)
• Carlsbad Caverns Radio Caving (P.R. Jorgenson)
• Very High Power Radiobeacon (B. Pease
• The TP-6N Field Telephone (J. Cardy)
• Simple Phone Line Amplifier (J. Cardy)
• Modifying the Classic Phone Patch (J. Cardy)

You can download it here.

Older versions are available on the NSS CommElect pages.