Effective antenna height

The effective antenna height (short: Effective height , English: Effective Antenna Height ) is the height of the antenna center point above the mean ground level of between 3 and 15 km in distance used to calculate the wave propagation required azimuthal direction. It can be considerably higher than the height of the transmission tower used .

The HAAT (English, abbreviation for: height above average terrain) is the height of the center of the antenna above the mean terrain level between 3 km and 16 km, also in the azimuthal direction required to calculate the wave propagation.

Effective height

The effective height is required to calculate the field strength with wave propagation models such as ITU-R P.370 or ITU-R P.1546 in the VHF range. It is an important parameter in the coordination of radio frequencies at transmitter locations and is defined in various international agreements on frequency coordination. In addition to other transmitter parameters, the effective height of the transmitter antenna is usually given by 36 values for the azimuths from 0 ° to 350 ° in 10 ° steps. Sometimes the maximum effective height of the transmitting antenna is also mentioned. This is the maximum from the 36 values mentioned.

HAAT

The HAAT is a similar parameter that e.g. B. is used in North America for frequency coordination of broadcast transmitters. It differs mainly in the averaging of the terrain data up to 16 km instead of only up to 15 km for the effective height.

In North America (especially in the USA) the HAAT of a transmitter has effects e.g. B. on its performance class. To do this, the HAAT values for the azimuths from 0 ° to 315 ° are determined in 45 ° steps and the arithmetic mean is calculated from them. Particular attention should be paid to azimuths that lead over large areas of water or cross the US border.

Individual evidence

↑ ^a ^b ITU: Recommendation ITU-R P.370-7: VHF AND UHF PROPAGATION CURVES FOR THE FREQUENCY RANGE FROM 30 MHz TO 1 000 MHz
^ ^A ^b ITU Recommendation ITU-R P.1546-3: Method for point-to-area predictions for terrestrial services in the frequency range 30 MHz to 3,000 MHz
^ ITU: final acts of the European Broadcasting Conference in the VHF and UHF bands Stockholm, 1961
^ ITU: final acts of the Regional Administrative Conference for the Planning of VHF Sound Broadcasting (Region 1 and Part of Region 3) Geneva, 1984
^ ITU: Final Acts of the Regional Radiocommunication Conference for planning of the digital terrestrial broadcasting service in parts of Regions 1 and 3, in the frequency bands 174-230 MHz and 470-862 MHz (RRC-06) Geneva, 15 May – 16 June 2006
↑ Federal Communications Commission (FCC): Radio and Television Broadcast Rules 47 CFR Part 73 [1]

[P.370-1] ITU: Recommendation ITU-R P.370-7: VHF AND UHF PROPAGATION CURVES FOR THE FREQUENCY RANGE FROM 30 MHz TO 1 000 MHz

[P.1546-2] A ^b ITU Recommendation ITU-R P.1546-3: Method for point-to-area predictions for terrestrial services in the frequency range 30 MHz to 3,000 MHz

[ST61-3] ITU: final acts of the European Broadcasting Conference in the VHF and UHF bands Stockholm, 1961

[GE84-4] ITU: final acts of the Regional Administrative Conference for the Planning of VHF Sound Broadcasting (Region 1 and Part of Region 3) Geneva, 1984

[GE06-5] ITU: Final Acts of the Regional Radiocommunication Conference for planning of the digital terrestrial broadcasting service in parts of Regions 1 and 3, in the frequency bands 174-230 MHz and 470-862 MHz (RRC-06) Geneva, 15 May – 16 June 2006

[FCC-6] Federal Communications Commission (FCC): Radio and Television Broadcast Rules 47 CFR Part 73 [1]