Ta strona używa plików cookies do poprawnego funkcjonowania.
Dowiedz się więcej
Ta strona używa plików cookies do poprawnego funkcjonowania.
Dowiedz się więcej
Propagation mode where radio waves are bent around sharp edges (e.g. peaks of mountains).
Temperature of a hypothetical resistor at the input of an ideal noise-free receiver that would generate the same output noise power per unit bandwidth as that at the antenna output at a specified frequency. Parameter that describes how much noise an antenna produces in a given environment.
The ratio of the effective Earth radius to the actual Earth radius.
The ratio of the magnitude of the open circuit voltage developed at the terminals of the antenna (electromotive force), to the magnitude of the component of the electric field strength ( in receiving point) in direction of antenna polarization.
Field-strength value exceeded at 50% of the locations within any specified (small) area and for 50% of the time. Field-strength level measurements should be done in long (e.g. during one year) term.
Measured in V/m.
The ability of an electric or electronic equipment or system to function satisfactorily in its electromagnetic environment without introducing intolerable electromagnetic disturbances to anything in that environment.
EMC
Kind of the waves that are propagated by simultaneous periodic variations of electric and magnetic field intensity.
Type of polarisation, at which electric vector vibrates with the varying amplitude and describes an ellipse in any fixed plane perpendicular to the direction of propagation.
1) Radio-frequency radiation in the case where the source is a radio transmitter. 2) Radio waves or signals produced by a radio transmitting station.
Relative gain of a transmitting antenna with respect to the power gain of isotropic antenna multiplied by the net power accepted by the antenna from the connected transmitter.
Relative gain of a transmitting antenna with respect to the power gain of half-wave dipole antenna multiplied by the net power accepted by the antenna from the connected transmitter
Radius of a hypothetical Earth for which the distance to the radio horizon, assuming rectilinear propagation, is the same as that for the actual Earth with an assumed uniform vertical gradient of atmospheric refractive index.