Date   

Re: AP1600 on equatorial pier

Robert Watters
 

The AP 1600GTO already goes to the 90* latitude with the stock factory side plates.  No need to remove and have new ones made.  See your owners manual for further information on how to accomplish this.

 

Robert


AP1600 on equatorial pier

astrotrf2002
 

I'm working on having someone fabricate an equatorial pier for my AP1600 mount.

My plan is to remove the AP1600 from the A-P fork and install it into a fork fashioned to allow the mount to point in what would be the "90 degrees latitude" position; attaching that fork to the equatorial pier would then point the mount at the north celestial pole.  Polar alignment will be accomplished by a tip-tilt plate; thus the A-P fork's altitude and azimuth adjustments would not be used in any case, rendering that fork unnecessary.

So I have some questions:

I was once told that modifications to the servo controller firmware would be required to operate the mount in this fashion.  Is that still the case, or does the ability to arbitrarily delay the meridian flip solve that problem?

Is there any reason why I absolutely *should not* remove the AP1600 mount from its supplied fork?

Are there other reasons I should not proceed with this idea?

Thanks.
Terry


Re: Carrying Case for AP1100

Jeff Crilly
 

Ditto.

Here's the way I look at the weight.  (According to specs on AP website...)

The 1200 RA is 50 lb alone.   It's a bit hefty, but I can single-person heft it on to the 54" pier.

The 1100 RA & DEC (without counterweight shaft) is 43.5 lb, but also add in a saddle, so we at like well under 50 lb.

So I think it is doable assembled.  (This will save setup time. I'm mostly portable around here)
(And I really like the idea of through-mount cabling. To be honest, dismantling the mount with the cabling looks like it would take longer than with the old AP mounts,)

I'm also contemplating mounting on losmandy HD tripod, and was considering leaving the losmandy adapter attached to the 1100 mount.. So a few more lbs there maybe.

That control-box being separate might be a bit tedious to work with, but probly not a big deal.

We shall see.  (Btw, right now I have no pier solution for the 1100, so I'm in the market for a decent losmandy HD tripod.  Preferably somewhere in the SF bay area.)

-jeff

On Feb 22, 2014, at 9:14 PM, jasillasen <JASillasen@...> wrote:

 

Yes, please.   I'm currently contemplating a single case with lift off cover rather than hinged or dual Pelican cases.  For the weight,  the one time hoist of both pieces,  the price is less than 2 big 1600 series or 1550Ms.   I know it's a fair heft but the cabling alone may be worth having one case.   Then again my mounts are in sheds I can't reach without the mounties or at least a dog sled until some melting occurs.


John Sillasen


Re: RAPAS reticle orientation

Donghun
 

I think that you are right.
Loosen the 'Do Not loosen screw' and rotate the part with the jack for the LED to align.

Donghun


Re: RAPAS reticle orientation

Stuart Forman
 

I'm the friend whom Chris speaks of.  I'm a little unclear as to which set screw to loosen and readujust.  In the directions there is an arrow with instructions, "DO NOT LOOSEN SCREW".  Is that the screw you speak of?  


Re: Doing GTO an object on "wrong" side of pier?

dawziecat
 

Thanks, Peter. I am still having difficulty with this though.
Here is what I am doing:
1/ Set meridian delay to 3E using HC.
2/ Using HC, move OTA well east of pier.
3/ GOTO object from HC with object being an hour or so east of the meridian.
4/ Mount acquires target, as desired, with CW bar upward a tad.
Now things go wrong:
Using the AP Jog utility, I attempt to tweak the framing by moving just a few minutes in any direction and . . .
the mount flips. :(
I did try unchecking the "Keep Mount Time Synced to PC Time (Recommended)" as you suggested. Seemed to make no difference.
Incidentally, the display on the HC remains indicative of a 3E setting for the meridian delay after this unwanted flip has occurred.
Is this not fairly common, acquiring a target nearing the meridian on the east side to avoid a flip early on in the session?
Suggestions appreciated.
Terry


Set local time

wsrison
 

Hello,
 I have a program that issues a :SLhh:mm:ss# command to a GTOCP3 AP 900 mount and the time I am giving the mount is not being set.  A response of "1" does come back from the mount.  I can set the time using the keypad.  Any ideas?
Example: the mount's time is 13:22:45 I set it to 13:38:45 and get a 1 response but the time does not change.
My command :SL13:38:45#
Response: 1

William


Re: RAPAS reticle orientation

Donghun
 

Thank you guys for the help.

I remember I used the Polaris method to align the bubble level for the Takahashi mount polar finder.

I'm surprised that the reticle can get out of alignment so easily. It must have been bumped while I was covering the scope. I will remove the finder as soon as I finish polar alignment from now on.

Donghun


Re: RAPAS reticle orientation

Don Anderson
 

Sometimes the set screw wasn't tightened fully at AP. The reticle illuminator light unit is quite long and if it gets bumped, can create a fair amount of torque on that ring.
I recall there was a post some time back on someone having this problem and Rolando explained how to re adjust the reticle. I would phone AP and talk to them before sending it back
Don Anderson


On Sunday, February 23, 2014 12:23:01 PM, "malonee72@..." wrote:
 
Ah this is a bad news.
I think I need to return the scope to AP for service.
I'm not confident that I can adjust that.
The unit needs dead on accuracy.

It is strange that this happens.
I never touched the set screw as instructed in the manual.

Thank you.
Donghun



Re: RAPAS reticle orientation

Wayne Hixson
 

That would definitely be a nice feature!


On Feb 23, 2014, at 11:50 AM, cford81@... wrote:

 

Yes this is a fairly easy fix and AP, but I hear of this happening so often that I feel it is a minor design flaw in the RAPAS. That small set screw never seems quite tight enough to prevent rotation and misalignment of the reticule if knocked, especially as the illuminator makes such a wonderful lever. A beefier set screw or several of them would help. When the reticule is aligned, it should be totally imobile. (Like drop on the ground imobile)

I have two RAPAS and have accidentedly knocked my reticule out of alignment multiple times, even through something as simple as the pressure on the illuminator of draping a cover over the telescope for the night. It risks souring the out of the box experience as evident in this thread. (A friend of mine has just received a new RAPAS and experienced the same also)

Chris



From: wayneh9026@...
To: ap-gto@...
Sent: Sunday, February 23, 2014 11:35:10 AM
Subject: Re: [ap-gto] RAPAS reticle orientation

 

You can adjust it under the night sky, I had the same thing happen. First center the reticle on Polaris. Then raise the altitude adjuster to move Polaris to the outer circle. If it lies on the 24h line, you're ok. Otherwise loosen the setscrew and rotate the reticle to lie on Polaris. Then lower the altitude adjuster to make sure Polaris moves back to the center point. Lock setscrew. Voila!

Sent via BlackBerry by AT&T

From: <malonee72@...>
Sender: ap-gto@...
Date: 23 Feb 2014 11:22:57 -0800
ReplyTo: ap-gto@...
Subject: Re: [ap-gto] RAPAS reticle orientation

 

Ah this is a bad news.

I think I need to return the scope to AP for service.
I'm not confident that I can adjust that.
The unit needs dead on accuracy.

It is strange that this happens.
I never touched the set screw as instructed in the manual.

Thank you.
Donghun


Re: RAPAS reticle orientation

CHRISTOPHER FORD
 

Yes this is a fairly easy fix and AP, but I hear of this happening so often that I feel it is a minor design flaw in the RAPAS. That small set screw never seems quite tight enough to prevent rotation and misalignment of the reticule if knocked, especially as the illuminator makes such a wonderful lever. A beefier set screw or several of them would help. When the reticule is aligned, it should be totally imobile. (Like drop on the ground imobile)

I have two RAPAS and have accidentedly knocked my reticule out of alignment multiple times, even through something as simple as the pressure on the illuminator of draping a cover over the telescope for the night. It risks souring the out of the box experience as evident in this thread. (A friend of mine has just received a new RAPAS and experienced the same also)

Chris



From: wayneh9026@...
To: ap-gto@...
Sent: Sunday, February 23, 2014 11:35:10 AM
Subject: Re: [ap-gto] RAPAS reticle orientation

 

You can adjust it under the night sky, I had the same thing happen. First center the reticle on Polaris. Then raise the altitude adjuster to move Polaris to the outer circle. If it lies on the 24h line, you're ok. Otherwise loosen the setscrew and rotate the reticle to lie on Polaris. Then lower the altitude adjuster to make sure Polaris moves back to the center point. Lock setscrew. Voila!

Sent via BlackBerry by AT&T

From:
Sender: ap-gto@...
Date: 23 Feb 2014 11:22:57 -0800
To:
ReplyTo: ap-gto@...
Subject: Re: [ap-gto] RAPAS reticle orientation

 

Ah this is a bad news.

I think I need to return the scope to AP for service.
I'm not confident that I can adjust that.
The unit needs dead on accuracy.

It is strange that this happens.
I never touched the set screw as instructed in the manual.

Thank you.
Donghun


Re: RAPAS reticle orientation

Wayne Hixson
 

You can adjust it under the night sky, I had the same thing happen. First center the reticle on Polaris. Then raise the altitude adjuster to move Polaris to the outer circle. If it lies on the 24h line, you're ok. Otherwise loosen the setscrew and rotate the reticle to lie on Polaris. Then lower the altitude adjuster to make sure Polaris moves back to the center point. Lock setscrew. Voila!
Sent via BlackBerry by AT&T

From: <malonee72@...>
Sender: ap-gto@...
Date: 23 Feb 2014 11:22:57 -0800
To: <ap-gto@...>
ReplyTo: ap-gto@...
Subject: Re: [ap-gto] RAPAS reticle orientation

 

Ah this is a bad news.

I think I need to return the scope to AP for service.
I'm not confident that I can adjust that.
The unit needs dead on accuracy.

It is strange that this happens.
I never touched the set screw as instructed in the manual.

Thank you.
Donghun


Re: RAPAS reticle orientation

Donghun
 

Ah this is a bad news.
I think I need to return the scope to AP for service.
I'm not confident that I can adjust that.
The unit needs dead on accuracy.

It is strange that this happens.
I never touched the set screw as instructed in the manual.

Thank you.
Donghun


Re: RAPAS reticle orientation

observe_m13
 

Yes, when looking down into the eyepiece the 0/24hour division on the reticle is parallel to the objective tube and points directly at the objective end.


---In ap-gto@..., <malonee72@...> wrote:

Hi Don,

Is 24h position pointing directly toward the RAPAS objective lens direction in your scope?

Thank you.
Donghun


Re: RAPAS reticle orientation

Donghun
 

Hi Don,

Is 24h position pointing directly toward the RAPAS objective lens direction in your scope?

Thank you.
Donghun


Re: Pictures of special angled pier for A-P mounts to avoid Meridian Flips

Robert Chozick
 

That is very interesting.  I had to visually recreate this with my arms to understand what you are doing.  The only failure scenario is hitting the ground.  As long as the whole setup clears the ground in any position and does not touch the vertical base holding up the mount I would think you this could go on for days turning around at any declination.  It would have to have a long arm to clear my 155 EDFS, field flattener and camera.

Robert

On Feb 22, 2014, at 7:49 PM, egroups@... wrote:

 

Robert,
Thanks for your reply.

> An A-P mount will not flip unless you tell it to do so.
Well, I'm no expert on this, but I do know that mount-control software wants to know whether it's controlling a GEM or a fork.  So my conjecture is that there are differences between merely *ignoring* the meridian (a la the A-P) and behaving as if there is *no such thing* as a meridian (a la a fork mount).  I'll admit to being unable to come up with failure scenarios, though.

My intent is to use the AP1600GTO's 90-degree declination holes to attach the mount to one of these bent piers so that the RA axis is colinear with the upper section of the pier.  I don't want to find out the hard way that this will lead me into unnatural positions such as pointing the scope toward the floor (which would not be good for my main mirror and the mirror mount).

Terry


Robert Chozick




Re: RAPAS reticle orientation

Don Anderson
 

Sounds like the set screw locking that round ring which the led reticle threads into has come loose and the ring has turned. You can simply loosen the set screw located in the body of the RAPAS at the rear just below the collar and reposition it then re-tighten the screw.
Don A


On Saturday, February 22, 2014 4:06:54 PM, "malonee72@..." wrote:
 
Hi guys,

Last night I looked through RAPAS first time in a while and I realized 24h position is not pointing straight up (not straight toward the RAPAS objective direction).
I'm pretty sure my memory is failing here but last time it seemed 24h position was pointing straight up.

I must be wrong right? 

Thank you.
Donghun



Re: Doing GTO an object on "wrong" side of pier?

Don Anderson
 

Alternately, you can also set the Meridian Delay from the Ascom driver if you want to keep your computer connected.
Don Anderson


On Saturday, February 22, 2014 2:58:28 PM, "pnagy@..." wrote:
 
Hi Terry,

If you are using ASCOM driver, try unchecking:

"Keep Mount Time Synced to PC Time (Recommended)"

This may prevent from your Meridian Delay set by hand controller from being reset by your PC.

Peter



Re: Carrying Case for AP1100

John A. Sillasen
 

Yes, please.   I'm currently contemplating a single case with lift off cover rather than hinged or dual Pelican cases.  For the weight,  the one time hoist of both pieces,  the price is less than 2 big 1600 series or 1550Ms.   I know it's a fair heft but the cabling alone may be worth having one case.   Then again my mounts are in sheds I can't reach without the mounties or at least a dog sled until some melting occurs.


John Sillasen


Re: Carrying Case for AP1100

Wayne Hixson
 

I got a case from ScopeGuard, unfortunately they are no
longer on business. 


On Feb 22, 2014, at 8:36 PM, Ross Salinger <rgsalinger@...> wrote:

 

What case did you use for your mach 1. I’ve been trying to work out what to use.

Rgrds-Ross

 

From: ap-gto@... [mailto:ap-gto@...] On Behalf Of Wayne
Sent: Saturday, February 22, 2014 5:57 PM
To: ap-gto@...
Subject: Re: [ap-gto] Carrying Case for AP1100

 

 

Thanks Paul, with my Mach1 I kept it assembled with the cabling intact. Don't want to try to horse the complete 1100 around as one piece. Will look into the Pelican cases 


On Feb 22, 2014, at 5:04 PM, Paul Lavoie <plav1959@...> wrote:

 

I use Pelican cases. I use a 1620 for the RA assembly and hand control and a 1610 for the Dec assembly, counterweight shaft, GTOCP3 and DOVELM162. I do through the mount cabling in the field, but find set up and take down as separates is not a big deal.


On Sat 2/22/14, at 16:30, <wayneh9026@...> <wayneh9026@...> wrote:

>
>
> Preparing for my 1100 to arrive in April! Wondering what other owners are using, now that ScopeGuard cases are no longer available. Probably would want a separate case for each component. For those doing thru-the-mount cabling and who do have to be portable, what do you do? Thanks! Wayne
>

i’m currently looking at these people as they can make custom size case :

http://www.casetechnology.com/

I already have a Pelican case for my 900GTO but I’m looking for a case for my AT12RC. As they can do pretty much any size with side foam up to 2” it should work for your 1100. The only thing .. it’s ont cheap.

Regards, Rodolphe

--
|        Rodolphe Pineau    RTI-Zone        |
|         http://www.rti-zone.org/          |
|   Robotics / Unix / Mac OS X / Astronomy  |



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