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Jim, You are in all probability tackling your problem from the wrong end.
Your EQ5 with an ED 80 on it, if polar aligned to within an arc minute or so of the SCP, will allow subs of at least 100-120 secs, and if really accurately aligned, a bit longer than that. Unless your mount has some
unusual mechanical or electrical problem, your alignment must be quite a way off. The fact that you are getting 30 secs suggests that your mount is o.k. Usually, if a mount has a problem, it shows up almost immediately you start tracking. I assume you are pointing the mount at due South, not magnetic.
If your alignment is in fact off, you will have the same problem with a new SXP or Az- EQ6.
If you fix this problem, you can defer buying another mount until you move up to a larger scope.
raymo
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