Utility Monitoring Central

Listening to non-broadcast digital radio communications from 10kHz to 1GHz
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Welcome to Utility Monitoring Central! 

This is the World Wide Web's premier information source for listeners of non-broadcast "utility" radio communications using digital transmission systems rather than voice to send messages. The Information section features stations operated by the world's military, diplomatic, commercial, government, humanitarian, intelligence and other organizations, monitored from the UK and USA between the frequencies of 10kHz and 1GHz. 

The Resources section includes frequency and other databases, provides information to help identify digital signals by their sound or signal parameters, tips on finding hardware or software decoders, and some useful links to related sites.  My logbook is updated monthly, and the ALE and selcal databases almost daily, detailing more than 6,000 ALE and 2,000 selcal identifiers.

Don't forget to check the monthly "Digital HF: Intercept & Analyze" column in The Spectrum Monitor magazine. 

You can also read annual compilations of past Digital Digest and Digital HF: Intercept & Analyze columns from 2009 to 2014 as ebooks available on Amazon's Kindle Bookstore

Please feel free to send a message to: umc at chace dash ortiz dot org if I can be of help, or if you have any comments, corrections or other information concerning these pages. 

Last Modified: 30th December 2014

All UMC content is Copyright 2003-2015 Mike Chace-Ortiz.  No commercial use of these pages and their content allowed unless by prior permission of the author