When.com Web Search

Search results

1. Results From The WOW.Com Content Network

2. Lightning arrester - Wikipedia

   en.wikipedia.org/wiki/Lightning_arrester

   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 ...

3. Counterpoise (ground system) - Wikipedia

   en.wikipedia.org/wiki/Counterpoise_(ground_system)

   In electronics and radio communications, a counterpoise is a network of suspended horizontal wires or cables (or a metal screen), used as a substitute for an earth connection in a radio antenna system. It is used with radio transmitters or receivers when a normal earth ground cannot be used because of high soil resistance [1] or when an antenna ...

4. Radio Amateur Civil Emergency Service - Wikipedia

   en.wikipedia.org/wiki/Radio_Amateur_Civil...

   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.

5. Mast radiator - Wikipedia

   en.wikipedia.org/wiki/Mast_radiator

   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.

6. Lightning rod - Wikipedia

   en.wikipedia.org/wiki/Lightning_rod

   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.

7. Amateur radio emergency communications - Wikipedia

   en.wikipedia.org/wiki/Amateur_radio_emergency...

   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.