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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]
AN/AAA - Airborne Infrared Auxiliary Systems Designation Purpose/Description Location/Used By Manufacturer AN/AAA-3: Receiver Group, paired with AN/AAS-15: F-8 Crusader: AN/AAA-4: Infrared search and track (IRST) system: F-4 Phantom II [1] [2] American Car and Foundry Company, [3] Texas Instruments (now Raytheon)
IR sites are generally used for a small geographic area or to fill in holes. For sites that are used to fill in coverage traffic is very limited. To allow as limited a number of channels for use, and to be spectrum efficient, Voice On Control (VOC) was developed to permit the control channel to temporarily act as a voice channel. [ 1 ]
An amateur radio repeater system consisting of a 70 cm repeater and a 2-meter digipeater and iGate. Coaxial cavity RF filter at 2 meter repeater An amateur radio repeater is an electronic device that receives a weak or low-level amateur radio signal and retransmits it at a higher level or higher power, so that the signal can cover longer ...
A land mobile radio system (LMRS) is a person-to-person voice communication system consisting of two-way radio transceivers (an audio transmitter and receiver in one unit) which can be stationary (base station units), mobile (installed in vehicles), or portable (handheld transceivers e.g. "walkie-talkies").
Saab AB began offering a multi-spectral personal camouflage system known as the Special Operations Tactical Suit (SOTACS) as early as 2005. [15] And as of 2018, multiple countries are phasing out legacy camouflage systems with multi-spectral systems. [16] [17] In 2024, IIT Kanpur introduced Anālakṣhya, a Meta-material Surface Cloaking System ...
LPD433 (low power device 433 MHz) is a UHF band in which license free communication devices are allowed to operate in some regions. The frequencies correspond with the ITU region 1 ISM band of 433.050 MHz to 434.790 MHz.
EchoLink working on Windows Vista.. EchoLink is a computer-based amateur radio system distributed free of charge that allows radio amateurs to communicate with other amateur radio operators using Voice over IP (VoIP) technology on the Internet for at least part of the path between them.
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