The Ground Wave Emergency Network was a US Air Force command and control communications system, deployed briefly between 1992 and 1994, intended for use by the United States government to facilitate m
Former GWEN tower, Essex, California
GPS gear added to former GWEN tower at Essex, California
RF radiation warning sign on former GWEN site at Essex, California
Longwave
Videos
In radio, longwave is the part of the radio spectrum with wavelengths longer than what was originally called the medium-wave broadcasting band. The term is historic, dating from the early 20th century
AN/URC-117 Ground Wave Emergency Network
…two-way radio system. The JETDS system also now is used to name all Department of Defense electronic systems. Each GWEN Relay Node site featured a longwave transmitting tower, generally between 290 and 299 feet (88 and 91 m) tall, and emitting an RF output of between 2,000 and 3,000 watts. Of 240 planned…
Tuning dial on 1946 Dynatron Merlin T.69 console radio receiver, showing LW wavelengths between 800 and 2000 metres (375–150 kHz)