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Invisible Fence Inc. (commonly referred to as Invisible Fence Brand) is a company that designs radio pet fences for cats and dogs. Manufactured and distributed by Radio System Corporation, the company sells wireless and fenceless systems that were first introduced in 1973. [ 1 ]
A pet fence or radio fence, is an electronic system designed to keep a pet or other domestic animal within a set of predefined boundaries without the use of a physical barrier. A mild electric shock is delivered by an electronic collar if its warning sound is ignored. The system was first invented and patented by Richard Peck in 1973. [1]
It is useful in land mobile radio systems used by public safety departments and fleets of utilities spread over a broad geographic area. [1] Like other centralized radio systems such as trunked radio systems, issues of delay or latency and reliance on centralized infrastructure can be impediments to adoption by public safety agencies.
Have Quick (also HAVEQUICK, short HQ) is an ECM-resistant frequency-hopping system used to protect military aeronautical mobile (OR) radio traffic. Since the end of World War II , U.S. and Allied military aircraft have used AM radios in the NATO harmonised 225–400 MHz UHF band (part of NATO B band [ 1 ] ) for short range air-to-air and ground ...
The ISSI standard is a non-proprietary interface that allows two or more P25-compliant trunked systems to be connected—even if they are from different vendors or operating in different frequency bands. It extends the interoperability of radio systems without the need to fund super-large networks or install large, complex gateways. [19]
OpenSky received the direct attention of Tyco Electronics when they acquired it along with AMP Inc. Tyco Electronics funded the company to acquire the EDACS radio system team and product line. The OpenSky system has since been sold into a number of important footprints, including the entire State of Pennsylvania, and the State of New York.
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