Class I Airport Flashing Beacon.
UNIDYNAMICS/PHOENIX INC ARIZ
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Under FAA sponsorship, research and development was conducted to test and fabricate a prototype of a Class I Flashing Beacon. This strobe type beacon provides alternate green and white flashes at one of two selected rates, 12 or 24 flashes per minute. The flashes are evenly spaced at six green and six white or twelve green and twelve white. At the slow rate, the effective intensities of white and green flashes are in excess of 50,000 and 7,500 candelas respectively. Fast rate intensities are one-half the slow rate. A set of cylindrical Fresnel lenses for each of two xenon flash lamps provides an omni-directional beam ten degrees wide vertically. The vertical beam axis can be varied from 5 to 7.5 degrees above the horizontal. The beacon system, which can be powered from either a 120 or 240 volt 60 Hz source, utilizes a condenser discharge power supply and two xenon flashlamps having an operational life in excess of three million flashes when operated at the six-flashes-per-minute rate. The power supply, which is housed in a Nema 12 weather-tight 24 inch by 24 inch by 10 inch enclosure consumes less than 3 KW and weighs approximately 250 pounds. Author