IEEE 1260-1996 pdf download IEEE Guide on the Prediction, Measurement, and Analysis of AM Broadcast Reradiation by Power Lines
3.12 major lobe: The radiation lobe containing the direction of maximum radiation. Syn: main lobe
3.13 minor lobe: Any radiation lobe except a major lobe
3.14 near-field radiation pattern: Any radiation pattern obtained in the ncar field of an antenna array.
3.15 near-field region: That part of space between the antenna array and the far-feld region. Refers to thefield of a source at distances that are small compared to the wavelength.
NOTE–The near field includes the quasi-static and induction fields varying as rand r, respectively, but it does notinclude the radiation field varying as r~
3.16 nighttime interference: A radio disturbance caused by skywave signals from distant stations. Skvwavepropagation loss is lowest at night.
3.17 null: The direction between radiation lobes where the signal drops to a minimum. In general, a null isany portion of the pattern where the signal level is less than 10% of the rms of the pattern.
3.18 omnidirectional pattern: A pattern with the same response in all azimuthal directions
NOTE–This radiation pattern results when only one tower is used to create the radiation pattern.
3.19 proof of performance: The report submitted to the regulatory body, which includes field strength mea-surements and other information, to show that the measured radiation pattern meets the conditions specifiedin the station license.
320 protections: Limitations imposed on the radiated signal for certain azimuths
NOTE–These limitations generally are set so that interference does not occur to stations in that direction.
3.21 radial: An azimuth where field strength measurements are taken, starting near the array and extendingto well into the far field. Measurements along a radial can be used to establish the radiation in a certain azimuth after allowing for changes other than ground conductivity, such as ncar field effects, temperaturechanges, loss or gain due to elevation changes, shadow losses and absorption, and other effects.
3.22 reradiation: The process by which an electromagnetic signal induces currents into a structure, whichthen causes radiation from that structure.
3.23 rms field: The horizontal component of the root-mean-square (rms) field strength in the far field of anarray, scaled to an effective value at 1 km, Syn: effective field.
3.24 skywave: A radio wave propagated obliquely toward, and returned from, the ionosphere
NOTE–This term has sometimes been called an ionospheric wave, but the term “jonospheric wave is intended to con-note internal waves in ionospheric plasmas
3.25 skywire: Electrically grounded wire or wires placed above phase conductors of an electric line or facility for the purpose of intercepting direct lightning strokes in order to protect the phase conductors from thedirect strokes.Syn: overhead ground wire.
NOTE-These wires may be grounded directly or indirectly through short gaps
3.26 test point: A geographic location that has been selected for the measurement of field strength.
IEEE 1260-1996 pdf download
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