The rotating signal generating the phase difference is used in the older conventional VORs. If you see around 48 little antennas arranged in a circle of 44' diameter, that would be a doppler VOR station which uses a doppler shift between the AM reference signal to the FM variable signal to generate the phase difference. The sense antenna receives the electrical part of the signal. ADF The ADF antenna receives electromagnetic signals from ground stations. The VOR/LOC antenna sends VOR signals to both VOR/MB receivers. The antenna receives VOR and localizer frequencies. Quoting tdscanuck ( Reply 1): VOR is transmitting to signals.a main signal (the big central antenna) and an electronically rotating signal (all the little ones). VOR The VOR antenna receives RF signals in the frequency range of 108 MHz to 117.95 MHz.
The more modern the installation, generally the more antennas you will see installed for a given function. Quoting RJSampson ( Thread starter): Why does a localizer station have multiple antennae and, for that matter, why does a VOR have several (or much more than several) transmitting antennae?Įssentially it has to do with antenna design, with better mathematical models of how antenna radiate their signals, more advanced antenna designs are used to provide a more uniform and accurate radiated signal and that is less susceptible to the normal inherent errors in those systems, and the physical surroundings. These documents is more than you will ever need to know operationally as a pilot, they describe how the various systems work. Quoting RJSampson ( Thread starter): However, the mechanics of a localizer (and for that matter a VOR) station were never discussed.