VOR, DUAL-SIDEBAND EQUIPMENT.
COLLINS RADIO CO CEDAR RAPIDS IOWA
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The FAABRD-404 dual-sideband doppler VOR system consists of a dual-sideband vhf transmitter and dual-rotor distributor developed for use with the FAA doppler VOR ground station. The dual-sideband transmitter consists of a sideband generator frequency and phase locked to a carrier transmitter, sideband amplifiers, and power amplifiers. The output of the sideband transmitter is 100 watts per sideband. The dual-rotor distributor is a capacity type distributor which switches the two sideband inputs to 50 antenna outputs. The sideband inputs are fed simultaneously to opposite antenna outputs. Opposite sideband suppression is 30 db and carrier suppression is 40 db at the output. Adjacent antenna output isolation is 30 db and isolation to the remaining antenna outputs are 50 db or more. The use of a dual-sideband system in the doppler VOR ground system is possible and should show improvement over a single-sideband system. Author