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Powerline worker performs maintenance of a lightning arrester on an electrical transmission tower in New Brunswick, Canada. A lightning arrester (alternative spelling lightning arrestor) (also called lightning isolator) is a device, essentially an air gap between an electric wire and ground, used on electric power transmission and telecommunication systems to protect the insulation and ...
At its base, the mast should have a lightning arrester consisting of a ball or horn spark gap between the mast and the ground terminal, so that current from a lightning strike to the mast will be conducted to ground. [3] The conductor from the lightning arrester should go directly to a metal ground stake by the shortest path.
E.F. Johnson Museum, Waseca, Minnesota EF Johnson Citizen Band walkie-talkie The company was founded in 1923 by Edgar F. Johnson and his wife Ethel Johnson. The company began as a mail order business, selling radio transmitting parts to amateurs and early radio broadcasters from space shared with a woodworking shop located in downtown Waseca.
A lightning arrester is a device, essentially an air gap between an electric wire and ground, used on electric power systems and telecommunication systems to protect the insulation and conductors of the system from the damaging effects of lightning. The typical lightning arrester has a high-voltage terminal and a ground terminal.
Only amateur radio stations who have previously registered with state and local governments to provide emergency radio communications for them in times of emergency can be activated. Other amateur radio operations might be suspended and operations under the RACES rules might be restricted to certain frequencies within the amateur radio bands.
Solar-powered Amateur Radio Station in tents. Note the portable VHF/UHF satellite and HF antennas in the background Rugged HF transceiver for voice communications. In times of crisis and natural disasters, amateur radio is often used as a means of emergency communication when wireline, cell phones and other conventional means of communications fail.
A terminal node controller (TNC) is a device used by amateur radio operators to participate in AX.25 packet radio networks. It is similar in function to the Packet Assembler/Disassemblers used on X.25 networks, with the addition of a modem to convert baseband digital signals to audio tones. [1]
SideHat - The 'SideHat' is a simple radio solution that attaches to existing SINCGARS radio installations, offering rapid, affordable and interoperable wideband network communications for Early Infantry Brigade Combat Team (E-IBCT) deployments and other Soldier radio waveform (SRW) applications.