One possible problem is that your servo is unusual and doesn't operate on the conventional signal range. We've encountered this problem before with Parallax servos. As a reference (I'm not sure about the actual DS output), since Hitec servos are the brand that FIRST recommends,
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Originally Posted by HITEC
All Hitec servos require 3-5V peak to peak square wave pulse. Pulse duration is from 0.9mS to 2.1mS with 1.5mS as center. The pulse refreshes at 50Hz (20mS).
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