File:Typical GWEN relay node.PNG

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Diagram of a US military Ground Wave Emergency Network automated radio relay station

DescriptionTypical GWEN relay node.PNG	English: Diagram of a Ground Wave Emergency Network relay node. GWEN was a survivable command and control communications network operated by the US military between 1982 and 1993 designed to ensure that messages from national command authority, such as nuclear launch orders, would reach US military facilities in the aftermath of a nuclear strike. It consisted of a network of unmanned radio relay "nodes" at 150-200 mile intervals throughout the US which forwarded messages on 150-175 kilohertz in the low frequency (LF) band. Radio transmissions in this band are relatively unaffected by the W:electromagnetic pulse (EMP) created by nuclear weapons that disrupt other electronic devices. The node consists of a UHF receiver and a 2 kilowatt low frequency transmitter driving a 299 ft high, umbrella antenna.
Date	7 August 2009
Source	Freedom of Information Act request
Author	US Government
Permission (Reusing this file)	Public Domain

	This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	03:03, 8 August 2009		950 × 895 (105 KB)	Tdrss (talk \| contribs)	{{Information \|Description=Ground Wave Emergency Network relay node \|Source=Freedom of Information Act request \|Date=7 Aug 2009 \|Author=US Government \|Permission=Public Domain \|other_versions= }} Category:Ground Wave Emergency Network

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