GBPPR 'Zine - Issue #5 - August 2004

Welcome to Green Bay Professional Packet Radio's (www.gbppr.org) crappy magazine!
Lots of pay phone information in this issue, never mind that it's from 1978...
Table of Contents
- Page 2 : Coin Telephone Introduction
- Brief introduction to Bell System pay phone service.
- Page 6 : 1C / 2C-type Coin Telephone Set
- Bell System Practice on pay phone specifications.
- Page 29 : 1A / 2A / 1C / 2C-type Coin Telephone Set - Functional Diagrams
- Block diagrams and schematics on pay phone operations.
- Page 41 : Bell System 177A Test Set
- Leaflet included with this old coin station test set.
- Page 45 : Homebrew "Digital" Cable TV Filter
- Page 47 : The Ramsey DA25 for SIGINT Applications
- A simple, broadband microwave antenna.
- Page 53 / Bonus
- 5ESS Switch Returned Circuit Pack Tag.
- Page 54 / The End