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.