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Andy from the PHD2 team has replied:
PHD2 will attempt to send small pulses in the 1-10 ms range to the mount. Some mounts are able to honor these small guide pulse commands; but, if the guide pulse duration is too short for the mount, the mount ignores it. The tracking error accumulates, and PHD sends a larger pulse. In this way PHD and the mount can reach a kind of equilibrium to achieve tracking performance close to the error that phd2 can measure on the guider chip and the smallest pulses that the mount can react to.
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