Published:2009/7/23 23:34:00 Author:Jessie | From:SeekIC
Gain is controlled by varying photomultiplier input volt-ager permitting photoelectric system to track brightness range from remote stars to moon.-W. J. Wichman and M. M. Birnbaum, Servo System Design for Balloon-Borne Star Trackers, Electronics, 34:35, p 43-46.
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