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[i]Three abnormally high data points appeared Just prior to touchdown. At altitudes below 50 feet, the range and velocity trackers are operating on highly attenuated signals resulting from the high discrimination of the receiver audio amplifiers to the low frequency signals at these trajectory conditions. Since the trackers are approaching signal dropout, the velocity trackers are particularly vulnerable to locking up on moving dust and debris generated by exhaust plume impingement on the lunar surface. Also, under these conditions, the range tracker is vulnerable to locking up at higher frequencies because of terrain features appearing in the range-beam side lobes.[/i]
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