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What are counterpoise wires?
Counterpoise, in electronics, portion of an antenna system that is composed of wires or other types of conductor arranged in a circular pattern at the base of the antenna at a certain distance above ground. Insulated from the ground, it forms the lower system of antenna conductors.
What is counterpoise grounding?
Counterpoise grounding consists of conductors buried below the surface of the earth that are connected to a power-system ground point. In the case of a transmission tower, the connection point could be the tower footing or the grounded side of a lightning arrestor.
What is counterpoise length?
Length of counterpoise should be approx. 20-30 feet but NOT resonant. If possible run the counterpoise away from or perpendicular to the antenna wire. You can also use the unun with no counterpoise or ground if your feedline is at least 25+ feet long.
How is a counterpoise connected to the ground?
It consists of a network of radial copper wires suspended above the ground, connected to the transmitter feedline ground. It is suspended about 8 feet above ground, so technicians can get access to the helix house at the foot of the tower. Antenna used in Lodge-Muirhead wireless system around 1900, the first counterpoise.
How are counterpoise systems substitute for Earth based ground systems?
Counterpoise systems are substitutes for large RF earth-based ground systems. Counterpoises, when properly implemented, can be very effective. can also be a source of frustration, providing poor lightning and safety grounds, encouraging local RFI (radio frequency interference), and sometimes creating receiver noise ingress
How does the counterpoise work in a radio station?
Counterpoise (ground system) Diagram of counterpoise under the antenna mast of an AM radio station. It consists of a network of radial copper wires suspended above the ground, connected to the transmitter feedline ground. It is suspended about 8 feet above ground, so technicians can get access to the helix house at the foot of the tower.
Which is the best definition of a counterpoise?
The counterpoise is the lower grid of horizontal wires, suspended below the antenna. The largest use of counterpoises is in transmitters on the low frequency (LF) and very low frequency (VLF) bands, as they are very sensitive to ground resistance.