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How Sound Powered Telephones Work
Sound Powered Telephone Products


How Sound Powered Telephones Work

Sound powered telephone communication technology uses electro-mechanical transducers which enable audio communication over a single wire pair without the use of external power or batteries. The sound pressure created from a user's voice when talking into the transducer is all that is required to power the system. A sound powered telephone network is often the only means of communication available during power failures and is thus hailed as a critical communication link during casualty or stealth conditions.

Sound powered telephones are also used in many commercial/industrial locations such as: airports, fire and police rescue crews, public utilities, schools, vaults, refrigeration plants, civil defense, bridge installations, ski slopes, oil fields, parks and forest, railroads, salvage yards, sporting arenas, shipyards, diving projects and geophysical operations where power is not available. Audio communications can be transmitted over 1 mile.

Sound powered telephone equipment is explosion proof making it ideal for arsenals and powder works, gas works, chemical plants, oil refineries, mines and quarries, ballistic missile sites and nuclear installations.

Lightweight and portable, the equipment is comfortably used for in-plant and outside maintenance, construction and repair; electrical contract installations, public utilities, radio, television, telephone installations and shipboard operations.


May 18, 2003 -- Actor/Comedian Conan O'Brien speaks to Sailors over a sound powered telephone during a recent visit to the USS Nimitz (CVN 68). The Nimitz Carrier Strike Force and Carrier Air Wing Eleven (CVW-11) are deployed in support of Operation Iraqi Freedom.... U.S. Navy photo by Photographer's Mate Airman Timothy F. Sosa. (RELEASED) **



At sea aboard USS Nimitz (CVN 68) Sep. 22, 2002 -- Seaman Rachelle Mack from Teaneck, N.J.. communicates on sound powered phone with the ship's navigational bridge as the AFT Lookout watch. Lookout watches scan the ocean for any activity in the vicinity of the ship 24 hours a day while the ship is at sea... U.S. Navy photo by Photographer's Mate Airman Shannon Renfroe. (RELEASED) **


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