Professional Organizations Audio Engineering Society Federal Communications Commission InfoComm National Association of Broadcasters National Systems Contractors Association Synergetic Audio Concepts The Association of British Theatre Technicians The Society of Broadcast Engineers, Inc.

Spectrum and Frequency Information Digital TV Zone JFMG Ltd. - UK Frequency Coordinator TVRadioWorld Scanner Frequencies by Major Cities UK Communication Regulator and Competition Authority Worldwide TV Information

Helpful Sites Electricity Around the World RF Café - Resource for RF, Wireless, Science, and More World Clock