Date   

Re: problem with mount resetting...

Todd Gross <toddg@...>
 

--- In ap-gto@..., "Paul Gustafson" <drgus@e...> wrote:
Another possible problem is the cigarette lighter adapter
connection. Every
alligator clip-to-female-cig-adapter I have seen was very cheaply
made and
doesn't give a positive connection. I took my 32 amp hour battery
to a
custom stereo store and explained the problem. For a reasonable
price, they
ran very heavy gauge wire from the battery terminals to special
snap-lock
connectors, and wired the mating connectors to the ends of my AP
power
cable, Kendrick controller, power inverter. There's absolutely no
way to
screw up, and each connection locks solidly with a positive
audible "snap."

The low quality cig adapter fried my Daystar filter (egads!) and
prompted my
search for a better setup.

Paul..
this may be my problem, I'm not sure, but I have now had too many
glitches using this stupid alligator clips on too many DC items to
ignore it or rule it out. I can't picture exactly what you did, but
I'm wondering if there is an off the shelf solution?

Todd


Re: problem with mount resetting...

Paul Gustafson <drgus@...>
 

Another possible problem is the cigarette lighter adapter connection. Every
alligator clip-to-female-cig-adapter I have seen was very cheaply made and
doesn't give a positive connection. I took my 32 amp hour battery to a
custom stereo store and explained the problem. For a reasonable price, they
ran very heavy gauge wire from the battery terminals to special snap-lock
connectors, and wired the mating connectors to the ends of my AP power
cable, Kendrick controller, power inverter. There's absolutely no way to
screw up, and each connection locks solidly with a positive audible "snap."

The low quality cig adapter fried my Daystar filter (egads!) and prompted my
search for a better setup.

Gus

Todd Wrote:

My mount is still resetting (A/P 600 GTO) Out of nowhere it just
resets and keeps running, but loses it's whereabouts. I am now using
a different battery (suspecting fluctuating voltage in the old) and
am going to swtich to a new cable tonight. If it keeps happening, is
there a cure short of sending it to a/p ?


problem with mount resetting...

Todd Gross <toddg@...>
 

My mount is still resetting (A/P 600 GTO) Out of nowhere it just
resets and keeps running, but loses it's whereabouts. I am now using
a different battery (suspecting fluctuating voltage in the old) and
am going to swtich to a new cable tonight. If it keeps happening, is
there a cure short of sending it to a/p ?

thanks

Todd


Re: Recalibrating object position

Chuck Hancock
 

The only consumer software product that does what Chris is talking about
is The Sky, as far as I know. The software models the mount/scope
combination, in a way, and compensates for the differences with the
ideal.

Todd Gross wrote:


At 01:19 AM 5/14/00 -0000, you wrote:
Suppose I set the scope on M3 and hit the "Recal" button and then
move
on to the next object and "tweak" that position with another "Recal".
Does the keypad "remember" each correction and thus improve the
scope's pointing accuracy as each "Recal" is done? Eventually the
scope should be right on if the mount can remember each calibration.
no, it remembers only the last..

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Recommended telescope position on powerup

Mike Mah
 

On AP GTO, does the declination axis position on powerup matter?

I know the RA axis should be visually aligned to Polaris and the
mount should be fairly horizontal. Is there an optimal position for
the declination axis (e.g. vertical or horizontal) that might affect
pointing or ease of setup? On other Gotos, there are recommendations
for the position of the Dec axis on powerup.

When I powerup with the dec axis vertical and after alignment using
the Polaris routine, I find that the dec axis is oblique between
vertical and horizontal when pointing at Polaris. Is this of any
consequence?

I am trying to chase down my source of ponting error of up to one
degree.

Mike Mah


Re: Recalibrating object position

Todd Gross <toddg@...>
 

At 01:19 AM 5/14/00 -0000, you wrote:
Suppose I set the scope on M3 and hit the "Recal" button and then
move
on to the next object and "tweak" that position with another "Recal".
Does the keypad "remember" each correction and thus improve the
scope's pointing accuracy as each "Recal" is done? Eventually the
scope should be right on if the mount can remember each calibration.
no, it remembers only the last..


Recalibrating object position

Chris Spratt
 

Suppose I set the scope on M3 and hit the "Recal" button and then
move
on to the next object and "tweak" that position with another "Recal".
Does the keypad "remember" each correction and thus improve the
scope's pointing accuracy as each "Recal" is done? Eventually the
scope should be right on if the mount can remember each calibration.


Playback PEM corrections

Chris Spratt
 

If you "train" the PEM at 1x or .5x what speed should you set the
keypad at when playing back the PEM? I usually have my speed set at
12x and leave it there for the observing once set. Does this setting
compromise the PEM playback?


Re: AP600 RA Backlash

Ron Wodaski <ronw@...>
 

I've had the same thing happen. On some nights, it seems that backlash
compensation needs to be adjusted depending on what side of the meridian I'm
on.

Ron W

-----Original Message-----
From: Chris Spratt [mailto:cspratt@...]
Sent: Saturday, May 13, 2000 4:28 PM
To: ap-gto@...
Subject: [ap-gto] AP600 RA Backlash


I've noticed that when I "train" my RA backlash that the number I
chose one night isn't good the next. I thought that once calibrated
the RA backlash number would be retained for each session. Now I have
to reset it each observing session. I'm using version 2.6 of the
software (mount came end of March 2000).

On my mount the range at 12x runs from 4-6 with 5 the median most
nights.

The balance of the 8" OTA and attachments I'm using appears to be
good.


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AP600 RA Backlash

Chris Spratt
 

I've noticed that when I "train" my RA backlash that the number I
chose one night isn't good the next. I thought that once calibrated
the RA backlash number would be retained for each session. Now I have
to reset it each observing session. I'm using version 2.6 of the
software (mount came end of March 2000).

On my mount the range at 12x runs from 4-6 with 5 the median most
nights.

The balance of the 8" OTA and attachments I'm using appears to be
good.


Question - tracking rates on AP mounts

Tim Khan
 

This past weekend in the Everglades, A question was
posed to me "does your AP1200 mount have the King
tracking rate." I checked the menu to find only the
Lunar, Solar, and Sidereal tracking rates.

The question is: does the software taken into account
the position and adujust the tracking rate due to the
atmospheric refrction effects.

Is it possible to model a tracking rate as a function
of the pointed position. I do understand that this is
complex due to the nature of the atmospheric
refraction calculations.

What is the exact difference between the two tracking
rates in arcsecs/hour?

Tim




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Re: Tripod for 400 GTO

Chuck Hancock
 

I have a 400GTO mount on order right now, and have received an item for
adapting the mount to the Celestron Celestar 8 Deluxe tripod. I think
mountong ring is the same thing Steve is taking about. ADATRI is the
Part No. for this item.

All I had to do was go to the hardware store for the right length bolts
and some nuts.

Chuck Hancock

Steve Leikind wrote:


Marc,

One other suggstion is to use the 400 GTO mount with a Meade field
tripod. This is an especially good options if you happen already to
have Meade tripod. In order for this to work, you must first obtain
the special plate that Astro-Physics provides as standard equipment
with the Davis and Sanford tripod. I believe they sell this
separately for about $50. I found that this plate adapts the 400
Mount to my Meade tripod in the same way that works with the Davis
and Sanford. The holes in the plate and bolts provided with it line
up exactly with corresonding holes in my Meade tripood.

The Meade tripod is very sturdy and much more robust than the Davis
and Sanford. It weighs about 20 pounds and is designed to support 8
- 12" SCT's and their fork mounts having weights between 40-95
pounds. Note: it is possible that you could use the Celestron field
tripod in the same way though I do not have first hand experience
with this.

-Steve

--- In ap-gto@..., "Marc Zukoff" <yooody@a...> wrote:
I am anxiously awaiting my mount, but am wondering about the Davis
and Sanford aluminum tripod.Is it a good choice or is the wood
tripod
a better one, or any other suggestions. i am planning on using a 4
inch refractor for now, but hope to also obtain a 5 inch refractor
in
the next year.
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Re: pointing accuracy

Louis A. Mamakos <louie@...>
 

Hi Colt,

Yes, from one part of the sky to the opposite side I have
seen better than 2-arc-minutes accuracy. To get this kind
of accuracy you need to make sure your OTA is orthogonal
and that none of the optical elements shift in movement
(e.g. many SCT's primary mirrors will shift when you move
to another part of the sky). That is why I said I get this
accuracy with my refractor.
Ah, so this makes sense. Based on my experience with some digital
setting circles on my G-11 mount (on the waiting list for a 900GTO, sigh),
polar alignment doesn't seem significant. That's of course doing a
two star alignment.

Orthoganality does seem very important during alignment (e.g., the
SET DEC=0 step) can be difficult on the G-11 given the lack of a fixed
declination axis setting circle.

louie


Re: pointing accuracy

Ron Wodaski <ronw@...>
 

I think that pointing accuracy on any of the AP goto mounts is excellent,
and mostly depends on how well aligned you are to the celestial pole. On
nights when I have taken the time for really good polar alignment, objects
routinely show up in just about exactly the same spot on the CCD chip. On
those nights, it wouldn't matter what camera I was using; objects would be
on the chip. <g>

To get really high pointing accuracy, you must also make sure that your
scope is well aligned to the mount's RA axis, of course.

Ron Wodaski

-----Original Message-----
From: Colt Bednorz [mailto:colt@...]
Sent: Saturday, May 06, 2000 8:44 AM
To: ap-gto@...
Subject: Re: [ap-gto] pointing accuracy


Ray,
So, it's not only on the chip of a st7/8, but not too far off center.
I looked at what u see and that would even hit the st-4's
little chip for a standard sct.
Thanks
Colt

Ray Gralak wrote:

Hi Colt,

With really good polar alignment (and my 5" refractor) I have
seen better than 2 arc-minutes accuracy on my 1200 GTO. And most
of that error could be from non-perfect polar alignment.

Taka care,

-Ray Gralak

-----Original Message-----
From: Colt Bednorz [mailto:colt@...]
Sent: Saturday, May 06, 2000 7:59 AM
To: ap-gto@...
Subject: [ap-gto] pointing accuracy



What is the pointing accuracy of the A.P.1200?
Assuming everything is accurately set up, and polar
aligned, what do you normally get?
I would imagine that this feature, which I've never had, is
pretty nice for imaging those faint invisible objects.

Thanks
Colt Bednorz


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Re: pointing accuracy

Ray Gralak <ray@...>
 

Hi Colt,

Yes, from one part of the sky to the opposite side I have
seen better than 2-arc-minutes accuracy. To get this kind
of accuracy you need to make sure your OTA is orthogonal
and that none of the optical elements shift in movement
(e.g. many SCT's primary mirrors will shift when you move
to another part of the sky). That is why I said I get this
accuracy with my refractor.

Take care,

-Ray

-----Original Message-----
From: Colt Bednorz [mailto:colt@...]
Sent: Saturday, May 06, 2000 8:44 AM
To: ap-gto@...
Subject: Re: [ap-gto] pointing accuracy


Ray,
So, it's not only on the chip of a st7/8, but not too far off center.
I looked at what u see and that would even hit the st-4's
little chip for a standard sct.
Thanks
Colt

Ray Gralak wrote:

Hi Colt,

With really good polar alignment (and my 5" refractor) I have
seen better than 2 arc-minutes accuracy on my 1200 GTO. And most
of that error could be from non-perfect polar alignment.

Taka care,

-Ray Gralak

-----Original Message-----
From: Colt Bednorz [mailto:colt@...]
Sent: Saturday, May 06, 2000 7:59 AM
To: ap-gto@...
Subject: [ap-gto] pointing accuracy



What is the pointing accuracy of the A.P.1200?
Assuming everything is accurately set up, and polar
aligned, what do you normally get?
I would imagine that this feature, which I've never had, is
pretty nice for imaging those faint invisible objects.

Thanks
Colt Bednorz


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Re: pointing accuracy

Colt Bednorz <colt@...>
 

Ray,
So, it's not only on the chip of a st7/8, but not too far off center.
I looked at what u see and that would even hit the st-4's
little chip for a standard sct.
Thanks
Colt

Ray Gralak wrote:

Hi Colt,

With really good polar alignment (and my 5" refractor) I have
seen better than 2 arc-minutes accuracy on my 1200 GTO. And most
of that error could be from non-perfect polar alignment.

Taka care,

-Ray Gralak

-----Original Message-----
From: Colt Bednorz [mailto:colt@...]
Sent: Saturday, May 06, 2000 7:59 AM
To: ap-gto@...
Subject: [ap-gto] pointing accuracy



What is the pointing accuracy of the A.P.1200?
Assuming everything is accurately set up, and polar
aligned, what do you normally get?
I would imagine that this feature, which I've never had, is
pretty nice for imaging those faint invisible objects.

Thanks
Colt Bednorz


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Re: pointing accuracy

Ray Gralak <ray@...>
 

Hi Colt,

With really good polar alignment (and my 5" refractor) I have
seen better than 2 arc-minutes accuracy on my 1200 GTO. And most
of that error could be from non-perfect polar alignment.

Taka care,

-Ray Gralak

-----Original Message-----
From: Colt Bednorz [mailto:colt@...]
Sent: Saturday, May 06, 2000 7:59 AM
To: ap-gto@...
Subject: [ap-gto] pointing accuracy



What is the pointing accuracy of the A.P.1200?
Assuming everything is accurately set up, and polar
aligned, what do you normally get?
I would imagine that this feature, which I've never had, is
pretty nice for imaging those faint invisible objects.

Thanks
Colt Bednorz


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pointing accuracy

Colt Bednorz <colt@...>
 

What is the pointing accuracy of the A.P.1200?
Assuming everything is accurately set up, and polar
aligned, what do you normally get?
I would imagine that this feature, which I've never had, is
pretty nice for imaging those faint invisible objects.

Thanks
Colt Bednorz


Re: Help with AP GTO on Parallax 125

ericj <ericj@...>
 

Peter wrote:

Can you or anyone tell me where to find a
three-star alignment technique? I've never heard of that before. Does it
require polaris?
Hi Peter:

Please see my response to Mike's question about the "three star alignment
procedure". I think I inadvertently created it :-). If you cannot use
Polaris from your site and the two-star alignment procedure isn't working
try using a third calibration star. It helped me to get accurate alignment.
Let us know how it goes.

Clear Skies,

Eric Jamison


Re: Help with AP GTO on Parallax 125

ericj <ericj@...>
 

Mike Mah wrote:

What is the three star alignment procedure? I don't recall seeing
this in the manual.
Hi Mike:

I think I inadvertently created the "three star alignment procedure" :-). I
noticed the other night that after I had used the two star alignment
procedure (Polaris and Vega) when the scope slewed to a deep-sky object it
was not quite in the center of the field of view, even in a low power
eyepiece. On page 8 of the GTO Keypad Controller manual, items 7 through 14,
it recommends that using additional calibration stars to get a more accurate
polar alignment.

In my case after I used Regulus as my third calibration star (the "third"
star in my "three star alignment procedure") any deep-sky object that the
scope slewed to was near the center of the field of view of the 16mm Zeiss.
Normally when deep-sky observing I start off with a low power 2" eyepieces
like a 56mm Meade or 35mm Panoptic and work my up to higher power views
using the 1-1/4" eyepieces. But Sunday night it was late, I was tired, so I
just left the 16mm in. When AP comes out with the polar scope it should make
the whole polar alignment process much easier and faster.

I should mention that I have only had the mount for a short while, and only
had the chance to use it a few times, so am learning like everyone else.
Also, I did not mean to imply that the Dec setting circle on other AP GTO
mounts might be off slightly as mine was. I think I just happened to get one
that had this issue.

Clear Skies,

Eric Jamison

-----Original Message-----
From: Mike Mah <mikemah@...>
To: ap-gto@... <ap-gto@...>
Date: Friday, May 05, 2000 8:42 PM
Subject: Re: [ap-gto] Help with AP GTO on Parallax 125


Thanks for the advice, everyone.

What is the three star alignment procedure? I don't recall seeing
this in the manual.

Mike Mah