Re: Adjust CP4 Clock Frequency

Roland Christen

You are asking for confidential information.
The sidereal drive rate is the same for you when you are doing the drift measurements as well as for APCC when it is doing the sky modeling. Any error present is present for both in the same amount.

Do the test I outlined if you are unsure about the accuracy of the mount's sidereal rate.


-----Original Message-----
From: Craig Young <craig.young.m8@...>
Sent: Tue, May 5, 2020 4:44 pm
Subject: Re: [ap-gto] Adjust CP4 Clock Frequency

How does the CP4 determine Sidreal Rate when using encoders?  For example, does the CP4 count encoder pulses over a given period of time?  Assuming the pulses represent an arc of the mount and knowing precisely the arc change per given time period it would seem this could be used to check the tracking rate.  Which would then imply a precise calibration of pulses per arc length.  How is that done?


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