Digital Digest 2015: How and Where to Intercept Secret Digital Communications on Shortwave Radio

These articles appeared originally as Digital HF: Intercept & Analyze, a monthly column in the pages of US radio listener’s magazine The Spectrum Monitor from January to December 2015. They are reproduced here with only minor editing and updating.
Digital HF: Intercept & Analyze and its predecessor of 15 years, Monitoring Times magazine’s Digital Digest, has sought to shine a light on the many organizations using digital communications techniques on shortwave (HF) radio by documenting their operating habits, frequencies and schedules used, and analyzing the digital systems they employ. If you are interested in finding ministries of foreign affairs, commercial businesses, embassies, armies, air forces, navies, multinational peacekeepers, police, intelligence agencies, customs and border patrol units, and many humanitarian aid and other NGOs (Non-Governmental Organizations) on HF radio and want to know how they work, this book is for you. This volume covers topics as diverse as monitoring maritime email networks, North Korean diplomatic operations, various MIL-STD-188-141A Automatic Link Establishment networks, the US Coast Guard COTHEN, Spanish Police, Irish Navy, Argentine Navy, German meteorological service, NAVTEX and a number of US high-level strategic and diplomatic networks, together with a number of mystery networks that remain unidentified.