Re: [ap-gto] 1200GOTO and HOMEDOME DDW


Apr 28, 2001

 


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#2352 Apr 28, 2001

Hi Folks,

I am using my new 1200 GOTO with a Prodome observatory with Digital Dome Works installed.



Below are the instructions for using the Dome with a computer controlled GTO mount so one can use THE SKY software to slave the dome with the mount.



My question is this, if the 1200 AP goto is tracking a object and then crosses the merdian, does it automatically flip so it knows it has crossed the merdian? Or do you have to slew the scope to the side of the merdian in order for the mount to flip?



The instructions below state:

"Most GEMs if started aimed East, will set themselves on top, and then track past the meridian without flipping around and under the polar axis until stopped by a pier or an internal interlock"

"However, if the scope is aimed East and then commanded to SLEW to the West, the mount will first deliberately flip to begin on top, and will then track around".

Is this what the AP 1200GOTO does?



Thanks



Joe



********************************************************************************

GE Mount Axis Flip Box

When using a German Equatorial mount, the scope may flip during operation. Imagine the scope aimed to the east over the "top" of the polar axis (as is normal). As the scope tracks, it rises toward the vertical, then "turns over" backwards as it rotates around the polar axis. Thus, 8 hours after you started, as you look to the west, the scope will be underneath the axis (if it did not bump the pier!). However, if you had first started looking to the west, you would have flipped the scope around (in dec), so that it could aim west and be on top of the polar axis (you would have done this to avoid the pier). Most GEMs if started aimed East, will set themselves on top, and then track past the meridian without flipping around and under the polar axis until stopped by a pier or an internal interlock. However, if the scope is aimed East and then commanded to SLEW to the West, the mount will first deliberately flip to begin on top, and will then track around. Thus, a scope aimed East and then tracked into the west will be in a different offset position compared to one that was started in the west, and the dome azimuth offsets will be different for the two cases.



How does the DDWCP know from the RA and DEC of the scope which condition applies. The answer is: it does not. You must tell DDWCP which condition applies. The default condition assumes the scope is "on top" (scope has not passed meridian since it was slewed to the target). If you track past the meridian, you should either reslew to the object (the mount will do a flip to get on top) or you should switch the meridan setting in the GEM flip box.



If you have a mount that automatically executes a flip at the meridian during tracking, you need to take no action







[Non-text portions of this message have been removed]



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#2372 Apr 30, 2001

In a message dated 4/28/2001 3:40:11 PM Pacific Daylight Time,

jmarietta@... writes:



>

> My question is this, if the 1200 AP goto is tracking a object and then

> crosses the merdian, does it automatically flip so it knows it has crossed

> the merdian? Or do you have to slew the scope to the side of the merdian

> in order for the mount to flip?

>

>

The scope will not automatically flip when crossing the meridian. This would

ruin countless atrophotos. It will only switch sides when you decide to do so

(by entering the same object again. You can see which side the object is on

by monitoring the red dashed meridian line in The Sky software.



Roland Christen







[Non-text portions of this message have been removed]



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#2376 Apr 30, 2001

Thanks Roland,

----- Original Message -----

From: chris1011@...>

To: ap-gto@yahoogroups.com>

Sent: Monday, April 30, 2001 10:10 AM

Subject: Re: [ap-gto] 1200GOTO and HOMEDOME DDW





> In a message dated 4/28/2001 3:40:11 PM Pacific Daylight Time,

> jmarietta@... writes:

>

>

> >

> > My question is this, if the 1200 AP goto is tracking a object and then

> > crosses the merdian, does it automatically flip so it knows it has

crossed

> > the merdian? Or do you have to slew the scope to the side of the

merdian

> > in order for the mount to flip?

> >

> >

> The scope will not automatically flip when crossing the meridian. This

would

> ruin countless atrophotos. It will only switch sides when you decide to do

so

> (by entering the same object again. You can see which side the object is

on

> by monitoring the red dashed meridian line in The Sky software.

>

> Roland Christen

>

>

>

> [Non-text portions of this message have been removed]

>

>

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group/ap-gto

>

> Your use of Yahoo! Groups is subject to docs.yahoo.com/info/terms/

>

>



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