This report compares measured and theoretical data with FAA antenna pattern specifications. 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. Sequence Numbers 12 and 19, however, although providing wide frequency separation from Sequence Number 2 in the case of the localizers, assign frequencies of 334.1 MHz and 333.5 MHz, respectively, for the glide paths, both being first adjacent channels (300 kHz spacing) to the Sequence Number 2 glide path channel. ILS localizer antennas have undergone significant changes in recent years. The LOC frequencies range between 108.10 MHz and 111.95 MHz (with the. Very High Frequency (VHF) voice radiotelephony continues to remain the. A Localizer (LOC) which provides the horizontal deviation with respect to the runway axis. One of the factors which affects a stations signal strength in space is its horizontal antenna pattern. Learn about CNS tools and find maps of PBN approach and ILS availability. 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. LOC carrier frequencies range between 108.10 MHz and 111.95 MHz (with the 100 kHz first decimal digit always odd, so 108.10, 108.15, 108.30, etc., are LOC. Abstract: The frequency assignment process is meant to insure interference-free service within the service volume.
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