Re: Bad initial guiding on my AP600e


Roland Christen
 


If I look at the PhD guiding assistant it tells me I need 2300 ms of dec backlash compensation.  So is this related to Dec backlash?
Yes, this is exactly Dec backlash and is typical of this mount. You can try to adjust it out, but it's not an easy thing to do.

Rolando

-----Original Message-----
From: Tom Blahovici <tom.va2fsq@...>
To: main@ap-gto.groups.io
Sent: Mon, Jan 18, 2021 6:31 pm
Subject: [ap-gto] Bad initial guiding on my AP600e

Hi
I have run into something with PhD guider that I would like feedback here first before going to their forum.
I use Voyager, and the way this works and the problem is :
1) It does a precise goto to an object.  In other words it does a goto, then it plate solves and if the error is less than 18" it starts the PhD guiding.
2) On this first positioning, and the start of guiding, the dec axis plot is drifting down a lot.  You can see that there is a lot of corrections being made.  As the Dec drift gets worse than 2" of arc, Voyager aborts.
3) Voyager, restarts the guiding and then all is OK.  The overall guiding is better than 0.5" over 20 minutes.

If I look at the PhD guiding assistant it tells me I need 2300 ms of dec backlash compensation.  So is this related to Dec backlash?
I am using a CP4. 

Thanks for any insight.
Tom

--
Roland Christen
Astro-Physics

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