Date   

Re: Life expectancy of AP mounts

Edd Weninger
 

In my opinion (retiring engineer who has done calculations of bearing
loads and possible wear on other devices), I doubt that bearing wear
in an AP900 (I have an AP900QMD and an AP1200GTO) will ever be an
issue causing increased errors.

The highest stress wear point is the worm-wheel contact when things
are out of balance. If this happens, it can adjusted out per A-P
instructions, provided the wear is evenly distributed over the wheel
circumference. If the wear is localized, PE may increase, but that
can be managed with other means.

Clear skies,

Edd Weninger
Overgaard AZ

--- In ap-gto@..., "mphammick" <mphammick@...> wrote:

I have an early (ish) AP900.

Is there any collective wisdom regarding the life of bearings etc.
Can
one say that errors start to build up beyond X-number of years ? I am
aware that this will depend upon hours of use rather than simple
age -
but I do not want to be chasing my tail as I try to get the tracking
accuracies under control.

Happy Christmas to all on this board.

Murray


Re: Accuracy of PASILL4

observe_m13
 

I haven't noticed such a problem due to the long polar bore. The full
field does exist but since the eye relief is poor, one must get very
close to see the entire field. Since I wear eyeglassses, this
invariably results in my being highly contorted to get close enough to
begin with and then forcing my glasses back towards my eye with the
eyepiece of the PASILL4 or PASILL3 until the entire field becomes
visible. There is no difference whether this is the AP1200, the AP900,
or the Mach1GTO.


--- In ap-gto@..., Eric Baumgartner <malkasten@...> wrote:

While we are on the topic of the PASILL4 polar alignment scope, I have a
question regarding its functionality in a 1-year-old AP1200GTO. I have
noticed that the deep, long polar axis bore in the AP1200 vignettes the
image seen through the polar scope to such an extent that it is very
difficult to see the second (delta UMi) and especially the third
star (OV
Cep). I find myself moving my head around to glimpse these other
stars, even
trying to improve their threshold visibility by unplugging the reticle.

Is vignetting in an AP1200 to be expected? Are other users this mount
experiencing it? Is there a solution or work-around? I use my AP1200
exclusively in temporary set-ups, so the polar alignment scope is a
regularly used tool in my visual observing routine.

Any help or advice will be much appreciated.

Clear skies,

Eric Baumgartner



On 12/24/07 4:52 PM, "Bryan Henry" <behenry10@...> wrote:

--- In ap-gto@..., "phenrotay" <Pierre.Henrotay@> wrote:

Hello,

I'd be interested in knowing what is the expected accuracy for the
PASILL4 polar scope (I am used to the Vixen polarscope ala
Alux/Sphinx
where an accuracy < 5 arcmin can be achieved routinely).

Pierre
Without a lot of fussing around, I routinely get 2 arcmin or less. And
I have the outdated reticle.

Bryan


Re: Error in AP keypad for East Longitudes

Pierre Henrotay
 

Additional info: a friend of mine has a AP900GTO, with CP2 and keypad
4.07.
A test shows that his keypad - whether connected to my controller or
his controller - does behave correctly.
So the verdict is: keypad version 4.12 does not correctly set/get
eastern longitudes to/from the controller (gets E 5 50, displays E 6
10).
Pierre

--- In ap-gto@..., "phenrotay" <Pierre.Henrotay@...>
wrote:

Hereafter my mail to AP support:

Dear,

I have a brand new Mach1 (bought from Baader) and experience
problems: it
looks as if there is a discrepancy between the longitude displayed
and/or
/entered via the keypad and the one stored in the controller. I am
living E
of Greenwich (E 5 50, N 50 35).
To make it simple: my location (E 5 50) entered via the keypad is
incorrectly stored in the controller as E 4 10; the keypad always
shows E 5
50 but the Gg command deals with E 4 10.
Latitude is OK.
Western longitudes are OK.
I am running 4.12, with chip version GTOCP3 rev L.

Still waiting for feedback from AP.

Regards to all
Pierre


Re: Accuracy of PASILL4

Eric Baumgartner
 

While we are on the topic of the PASILL4 polar alignment scope, I have a
question regarding its functionality in a 1-year-old AP1200GTO. I have
noticed that the deep, long polar axis bore in the AP1200 vignettes the
image seen through the polar scope to such an extent that it is very
difficult to see the second (delta UMi) and especially the third star (OV
Cep). I find myself moving my head around to glimpse these other stars, even
trying to improve their threshold visibility by unplugging the reticle.

Is vignetting in an AP1200 to be expected? Are other users this mount
experiencing it? Is there a solution or work-around? I use my AP1200
exclusively in temporary set-ups, so the polar alignment scope is a
regularly used tool in my visual observing routine.

Any help or advice will be much appreciated.

Clear skies,

Eric Baumgartner

On 12/24/07 4:52 PM, "Bryan Henry" <behenry10@...> wrote:

--- In ap-gto@..., "phenrotay" <Pierre.Henrotay@...> wrote:

Hello,

I'd be interested in knowing what is the expected accuracy for the
PASILL4 polar scope (I am used to the Vixen polarscope ala
Alux/Sphinx
where an accuracy < 5 arcmin can be achieved routinely).

Pierre
Without a lot of fussing around, I routinely get 2 arcmin or less. And
I have the outdated reticle.

Bryan


Re: Nine Hours on NGC 2403

Woodwind
 

Interesting - many thanks for the reply.

Murray

stardoctor5 <stardoctor5@...> wrote: Dear Murray,
I use pempro to smooth tracking, but still use autoguiding. Pempro
gets my peak-peak tracking error to 1.6 arcsec (+/-0.8 arcsec) on my
AP900. To keep FWHM at 2-2.5, I still have to autoguide when
imaging at under an arcsec/pixel.

I recently purchased an AP1200, that was "preprogramed" with Pempro,
that shows a Peak-to-peak error of only 0.34 arcsec with pempro
running! If I were undersampling, I should get by without guiding
on the 1200 if my polar alignment is good enough.
Ruben

--- In ap-gto@..., Murray Hammick <mphammick@...> wrote:
>
> Am I reading this right - you have not guidance - just working on
good tracking ??
>
> stardoctor5 <stardoctor5@...> wrote:
Dear Group,
>
> I finished processing 9 hours of exposures on NCG 2407, Caldwell
7,
> taken with my ST10XME, and AP nosepiece reducer, through a Meade
12"
> LX200R, loaded up on my AP900GTO. Using the SKY, I calculated a
focal
> length of 2240 mm with this combo. Tracking smoothly with Pempro
kept
> my FWHM 2-2.5 over the four hours of luminence.
>
> with music: http://www.stardoctor.org/c7.html
> without music: http://www.stardoctor.org/c7-hush.html
>
> Comments and suggestions are encouraged.
>
> Ruben
>
>
>
>
>
>
>
>


AP1200 chip.

TUR
 

I've bought AP1200 with installed chip G. The seller supplied also
chip "I" 05/18/05. Will I receive additional useful features when
replace chip ? Is it worth to do it ?

Pawel


Re: Nine Hours on NGC 2403

Robin Kerr
 

Dear Murray,
I use pempro to smooth tracking, but still use autoguiding. Pempro
gets my peak-peak tracking error to 1.6 arcsec (+/-0.8 arcsec) on my
AP900. To keep FWHM at 2-2.5, I still have to autoguide when
imaging at under an arcsec/pixel.

I recently purchased an AP1200, that was "preprogramed" with Pempro,
that shows a Peak-to-peak error of only 0.34 arcsec with pempro
running! If I were undersampling, I should get by without guiding
on the 1200 if my polar alignment is good enough.
Ruben

--- In ap-gto@..., Murray Hammick <mphammick@...> wrote:

Am I reading this right - you have not guidance - just working on
good tracking ??

stardoctor5 <stardoctor5@...> wrote:
Dear Group,

I finished processing 9 hours of exposures on NCG 2407, Caldwell
7,
taken with my ST10XME, and AP nosepiece reducer, through a Meade
12"
LX200R, loaded up on my AP900GTO. Using the SKY, I calculated a
focal
length of 2240 mm with this combo. Tracking smoothly with Pempro
kept
my FWHM 2-2.5 over the four hours of luminence.

with music: http://www.stardoctor.org/c7.html
without music: http://www.stardoctor.org/c7-hush.html

Comments and suggestions are encouraged.

Ruben






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


Re: Nine Hours on NGC 2403

Woodwind
 

Am I reading this right - you have not guidance - just working on good tracking ??

stardoctor5 <stardoctor5@...> wrote: Dear Group,

I finished processing 9 hours of exposures on NCG 2407, Caldwell 7,
taken with my ST10XME, and AP nosepiece reducer, through a Meade 12"
LX200R, loaded up on my AP900GTO. Using the SKY, I calculated a focal
length of 2240 mm with this combo. Tracking smoothly with Pempro kept
my FWHM 2-2.5 over the four hours of luminence.

with music: http://www.stardoctor.org/c7.html
without music: http://www.stardoctor.org/c7-hush.html

Comments and suggestions are encouraged.

Ruben


Life expectancy of AP mounts

Woodwind
 

I have an early (ish) AP900.

Is there any collective wisdom regarding the life of bearings etc. Can
one say that errors start to build up beyond X-number of years ? I am
aware that this will depend upon hours of use rather than simple age -
but I do not want to be chasing my tail as I try to get the tracking
accuracies under control.

Happy Christmas to all on this board.

Murray


Re: Accuracy of PASILL4

planetary_hunter
 

--- In ap-gto@..., "phenrotay" <Pierre.Henrotay@...> wrote:

Hello,

I'd be interested in knowing what is the expected accuracy for the
PASILL4 polar scope (I am used to the Vixen polarscope ala
Alux/Sphinx
where an accuracy < 5 arcmin can be achieved routinely).

Pierre
Without a lot of fussing around, I routinely get 2 arcmin or less. And
I have the outdated reticle.

Bryan


Accuracy of PASILL4

Pierre Henrotay
 

Hello,

I'd be interested in knowing what is the expected accuracy for the
PASILL4 polar scope (I am used to the Vixen polarscope ala Alux/Sphinx
where an accuracy < 5 arcmin can be achieved routinely).

Pierre


Re: AP900 Capacity for AP

Norm
 

John,

I agree...go for the 1200. For photography the more mount the
better...NO QUESTION!

Norm

--- In ap-gto@..., "John Moore" <clearsky@...> wrote:

New to the AP-GTO group, and with a question:

I'm planning a mount upgrade in my permanent observatory. Pier
mounted. I'd like to put my C-11 and my Meade AR-6 on the same mount
using a side-by-side. With a guidescope and cameras, I estimate about
68-70 pounds as the total weight. Can I save the extra grand for the
AP1200 and get the AP900, or am I pushing the mount beyond its
capability?

Thanks in advance for your input.


Re: AP1200 guiding.

TUR
 

Thank you Joe for your support !

During my first session when I saw those oscillations I decreased
Maxim's Aggressiveness to 1 and then Backlash to 0 for both axis.
After that the Guider was working a bit smoother but the oscillation
was still detected.
Las night I did some additional test. (Pe curve with PemPro) and two
test in PulseGuide. You can see pictures at our local Polish
Astronomy forum :-)
http://www.astromaniak.pl/viewtopic.php?t=3788
Comments are welcome :-)

Thanks
Pawel


--- In ap-gto@..., "jmize@..." <jmize@...> wrote:

Pawel, those are known as 'ocillations', check the following;

...First try Lowering the 'Aggressivness' in the Guide Tab for
that axis, this will probably eleminate the problem.
...If that doesn't check your 'Backlash' settings for that axis.
Guide Tab dropdown list > Guider Settings > Settings Tab.
...Finally, you "really" want to avoid doing this unless
absolutely necessary, check and adjust the mount's gear spacing for
that
axis. A-P has write-ups for doing this, be sure you get the
correct 'CP3' procedures and be sure you really do need to do this
before starting.

While you are exposing an image use Maxim's "?" clicking on fields
for explanations or use Maxim's Help facility. I'd suggest
Help's "Guide Tab" section as the place to start...joe :)


"May You Go Among The Imperishable Stars"

Joe Mize
StarFields Observatory http://www.cav-sfo.com/
Chiefland, FL 29:24'33.4"N 82:51'37.7"W


------- Original Message -------
From : turekpawel[mailto:pturek007@...]
Sent : 12/23/2007 7:23:18 AM
To : ap-gto@...
Cc :
Subject : RE: [ap-gto] AP1200 guiding.

Recently I've bought three years old second hand AP1200 CP3. A
week
ago I've tried to take my first guied pictures. The weather wasn't
very good that night but I made some tests.
This is my first image taken trough Newton 254/1200mm and ST2000
XM.
Only L 2x300s+2x180s.
http://images29.fotosik.pl/124/58e7379fecb5c5fb.jpg
Unfortunately during this session I found that guider was working
very strange sometimes. Please look at this link.
http://images31.fotosik.pl/76/36f4380541469209.jpg
It's not periodical.

Many thanks in advance for some ideas, tips what I should do to
get
rid of this problem or what additional measurements I should make
to
check this problem out.

Regards
Pawel







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Re: USB v's Ethernet v's RS232 (was Re: Desperately trying...)

Louis Mamakos
 

Sorry I missed this thread earlier.

Just two points I'd like to make at this belated time:

1. If AP produced a new servo controller with an Ethernet interface for connectivity, I would purchase an upgrade to replace my GTOCP2 controller. I'd be uninterested in an "upgrade" to a mount with USB connectivity, as it doesn't solve any problem that I have.

2. For longer-distance communications, Ethernet gives you so much more flexibility! Even controlling the mount from 50 feet away from inside the house, I would hesitate to run a long serial cable. Ethernet is nice because I can extend the physical layer over fiber optic cable for less $$$ than stupid USB/CAT5 converter boxes and solve a connectivity problem for the whole observatory. And I don't have to worry about a nearby lightning strike inducing energy into that long conductor and smoking the equipment on both ends. I've witnessed that before, and I'm uninterested in repeating the experience. And with wireless LANs and a huge thriving industry building solutions for you to use, it's so clearly the right answer!

Please, I beg of you and the rest of the astronomy equipment industry to move to Ethernet as a connectivity solution. It will save us from rats nests of cabling, USB/serial adapters and all the other horror coming from the mess of cables coming off the mount and scopes.

Also, see point (1) above for your market research and business case.

louie

On Dec 14, 2007, at 11:26 AM, chris1011@... wrote:

In a message dated 12/13/2007 8:35:43 PM Central Standard Time,
winfij@... writes:


Fair enough. I've never tried running multiple commands simultaneously
even when I have the handset and PC connected together - I've either
used one other other but not both at exactly the same time with
conflicting commands (e.g. two gotos).
No problem. The mount will respond to your commands no matter where they come
from. It goes (logically) to the last command issued, regardless where the
command came from. It is happy to slew all day long as fast as you can command a
new slew, and it will never get confused in this situation.

Rolando


**************************************
See AOL's top rated recipes
(http://food.aol.com/top-rated-recipes?NCID=aoltop00030000000004)





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Re: AP900 Capacity for AP

 

--- In ap-gto@..., Mark Squicquero <docsquic@...> wrote:

John,
Best choice I've made thus far in equipment.
Mark: your post is probably the most convincing of the discussion -
exactly the set up I'm looking at, add a bunch of weight, and the
mount says 'is that all you've got??'.

My history is just as you describe it - started with three different
fork mounted scopes, decided to get into AP, went to a CG-5, and then
to the current G-11. I spend a lot of frustrating hours tweaking the
mount, getting the perfect balance, etc., etc. I want this to go away
so I can enjoy the quest for a perfect photo - and the DIFFERENT
frustrations that results in!!! :-)

Thanks for the input!


Re: AP900 Capacity for AP

 

--- In ap-gto@..., "roy uyematsu" <roystarman@...> wrote:

In any
case you will discover something that most AP users have uncovered.
Now you can worry about all the other things but the mount can be
checked off the list.
This is exactly what I'm looking for - a mount that takes itself out
of the equation. I've also been looking at the Losmandy Titan, but
even the Titan owners say, if money and portability aren't issues, get
the AP1200.

I think I've pretty much decided on this course of action - and
considering that A-P just finished selling the last of their most
current run of AP1200's, I've got a good while to save the extra cash.

Thanks to all who have posted. The responses here and in the Losmandy
forums all point in one direction -> AP1200!!!


Re: AP900 Capacity for AP

Mark Squicquero
 

John,

I started with the arrangement that you are proposing: C-11 and AP160 side by side with Casaday Tandem bar. I have an AP1200 CP2. That lasted only one year when a C-14 popped up and now it is C-14 and AP160. The mount purred on like nothing had changed (balance...we don't need no stinkin balance..:-) Like others have said, you never know. When I was purchasing my mount I followed the saged advice and ordered the most mount I could afford and haven't regretted it for a moment. Even though I haven't used it as such, the AP1200 isn't very hard to take down and put up in a portable scenario, should you need to do so. Best choice I've made thus far in equipment.

Mark


Re: AP900 Capacity for AP

roy uyematsu <roystarman@...>
 

I have an ap900 and can tell you that it is a fine mount but for the little
extra and if you don't need portability the 1200 would be my choice As for a
pier The 1200 is larger but a piece of scrap pipe sand blasted and painted
be it 8 or 10 is not much of different.they normally go by weight. In any
case you will discover something that most AP users have uncovered. It sure
is nice not worrying about the mount. If you progressed through the poor
quality of the fork mounts with periodic error in the 30 arc second range or
greater and all those unknown guiding errors, to have a mount with a
periodic error of under 10 arc seconds +/- 5 out of the box, in most cases
and solid enough to not worry about a slight load imbalance is a pleasant
surprise. Now you can worry about all the other things but the mount can be
checked off the list.



_____

From: ap-gto@... [mailto:ap-gto@...] On Behalf Of
stardoctor5
Sent: Sunday, December 23, 2007 10:24 PM
To: ap-gto@...
Subject: [ap-gto] Re: AP900 Capacity for AP



John,
I now have both the AP900 and the AP1200. For your configuration,
the AP900 would be at its limit. The AP1200 would handle it easily,
and give you room to expand a bit in the future.
Ruben

--- In ap-gto@yahoogroups. <mailto:ap-gto%40yahoogroups.com> com, "John
Moore" <clearsky@...> wrote:

New to the AP-GTO group, and with a question:

I'm planning a mount upgrade in my permanent observatory. Pier
mounted. I'd like to put my C-11 and my Meade AR-6 on the same mount
using a side-by-side. With a guidescope and cameras, I estimate
about
68-70 pounds as the total weight. Can I save the extra grand for the
AP1200 and get the AP900, or am I pushing the mount beyond its
capability?

Thanks in advance for your input.


Error in AP keypad for East Longitudes

Pierre Henrotay
 

Hereafter my mail to AP support:

Dear,

I have a brand new Mach1 (bought from Baader) and experience
problems: it
looks as if there is a discrepancy between the longitude displayed
and/or
/entered via the keypad and the one stored in the controller. I am
living E
of Greenwich (E 5 50, N 50 35).
To make it simple: my location (E 5 50) entered via the keypad is
incorrectly stored in the controller as E 4 10; the keypad always
shows E 5
50 but the Gg command deals with E 4 10.
Latitude is OK.
Western longitudes are OK.
I am running 4.12, with chip version GTOCP3 rev L.

Still waiting for feedback from AP.

Regards to all
Pierre


Re: AP900 Capacity for AP

Robin Kerr
 

John,
I now have both the AP900 and the AP1200. For your configuration,
the AP900 would be at its limit. The AP1200 would handle it easily,
and give you room to expand a bit in the future.
Ruben


--- In ap-gto@..., "John Moore" <clearsky@...> wrote:

New to the AP-GTO group, and with a question:

I'm planning a mount upgrade in my permanent observatory. Pier
mounted. I'd like to put my C-11 and my Meade AR-6 on the same mount
using a side-by-side. With a guidescope and cameras, I estimate
about
68-70 pounds as the total weight. Can I save the extra grand for the
AP1200 and get the AP900, or am I pushing the mount beyond its
capability?

Thanks in advance for your input.