![]() For each antenna type, a single horizontal antenna pattern is recommended for use in the frequency assignment process. Most markers at other frequencies will not be readable. Other markers may give some response but the detection range and accuracy may be affected. Do NOT use the LOCalizer Reader with RFID markers other than the Health Beacons Tags. This report compares measured and theoretical data with FAA antenna pattern specifications. The LOCalizer Reader is designed to locate the low frequency 134 kHz Health Beacons Tags. The horizontal localizer antenna pattern now has a substantial effect on the separation required between localizer stations. In order to reduce siting effects, antenna patterns have evolved from the nearly omnidirectional 8-loop to the highly directional traveling wave and log periodic dipole antennas. FAA instrument procedures published for use from 20 April 2023 at 0901Z to at 0900Z. ILS localizer antennas have undergone significant changes in recent years. One of the factors which affects a station's signal strength in space is its horizontal antenna pattern. This is done by choosing frequencies in a manner which provides certain minimum cochannel and adjacent channel desired to undesired signal ratios at critical points of the service volume. The frequency assignment process is meant to insure interference-free service within the service volume. Wireless frequency coordination professionals can reference the Wireless Frequency Compatibility Charts to assist with multiple band or multiple system setups. ![]() THE SELECTION OF ILS LOCALIZER ANTENNA PATTERNS FOR USE IN THE FREQUENCY ASSIGNMENT PROCESS ![]()
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