Date   

Re: Question about the Adapter for the Losmandy polar scope.

George
 

Ron,

 

If you have questions, call me.

 

Regards,

 

George

 

George Whitney

Astro-Physics, Inc.

Phone:  815-222-6538 (direct line)

Phone:  815-282-1513 (office)

Email:  george@...

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Ron Yates
Sent: Tuesday, June 8, 2021 12:35 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Question about the Adapter for the Losmandy polar scope.

 

Actually, upon checking at the Losmandy web site, our polar scope IS the one that they currently sell.  So the idea that we are using a 'prior' model is not the right answer.  Moreover, I own a scope that I purchased in 2009.  The scope the society owns was purchased 2 years ago.  Both are the exact same scope, and both are the same as what is currently being sold.  The only difference is that mine had the previous illuminator that was sold with it, which I have since replaced with the new one.


Re: Adding Primaluce Labs ECCO2 for Environmental sensor?

Brent Boshart
 

Wayne or anyone else,  do you find the pressure reading on your ECCO2 to be accurate?  I recently purchased one and the pressure is way off.  I get readings around 967 whereas multiple weather sources report around 1010.  


Re: Question about the Adapter for the Losmandy polar scope.

Robert
 

You'll need part # M4037 in addition to the Q8140 you already have.  I believe this originally came with the mount so someone must have removed it somewhere along the years.
M4037 will thread into the shaft end of the 1200 and then the Q8140/polarscope combo will thread into that.

Robert


Re: Question about the Adapter for the Losmandy polar scope.

Ron Yates
 

Actually, upon checking at the Losmandy web site, our polar scope IS the one that they currently sell.  So the idea that we are using a 'prior' model is not the right answer.  Moreover, I own a scope that I purchased in 2009.  The scope the society owns was purchased 2 years ago.  Both are the exact same scope, and both are the same as what is currently being sold.  The only difference is that mine had the previous illuminator that was sold with it, which I have since replaced with the new one.


Re: Question about the Adapter for the Losmandy polar scope.

Jeffc
 

Probably they’ll take a return exchange.  You should call AP.  

I have an AP1200 and a losmandy polar scope.   I also had an AP900 first that I used the Losmandy polar scope.  

I vaguely recall There was a part I had to remove from the AP900 polar scope and use it with the AP1200.   There was a part I thought was part of the polar scope but it wasn’t.  Back then Marj removed the confusion for me.  

Later I added a RPA polar scope.   The RPA uses a different RA axis plate/cover.  Make sure your mount doesn’t have the RPA compatible plate.  The RPA back plate has (iirc) three holes for mounting the RPA.  The older one does not.   
AFAIK the RPA back plate is not (might not?) compatible with the losmandy polar scope.  

-jeff

On Jun 7, 2021, at 8:06 PM, Ron Yates <orogenicman@...> wrote:



One would think that AP has smart people in their employ that would note that the other adapter has threads that fit these polar scopes "from prior years".  Then they could point out on their web site "by the way, if you have a Losmandy polar scope from prior years (whatever that means), you can use the other adapter.

So my question is, if we ship the one we bought back to AP, will they give us credit towards purchasing the other adapter?  And that leads to the critical question, are those large threads on the other adapter in fact the same as the large threads on the Q8140-A?  And are they the same on either end of the adapter?  Our polar scope has the same female threads that are on the 1200GTO.  So we need an adapter that has the same matching male threads on both ends of the adapter.


Re: Question about the Adapter for the Losmandy polar scope.

Ron Yates
 
Edited

One would think that AP has smart people in their employ that would note that the other adapter has threads that fit these polar scopes "from prior years".  Then they could point out on their web site "by the way, if you have a Losmandy polar scope from prior years (whatever that means), you can use the other adapter".

So my question is, if we ship the one we bought back to AP, will they give us credit towards purchasing the other adapter?  And that leads to the critical question, are those large threads on the other adapter in fact the same as the large threads on the Q8140-A?  And are they the same on either end of the adapter?  Our polar scope has the same female threads that are on the 1200GTO.  So we need an adapter that has the same matching male threads on both ends of the adapter.


Re: Question about the Adapter for the Losmandy polar scope.

Peter Nagy
 

According to A-P web site for Q8140-A adapter at https://www.astro-physics.com/q8140-a , it says:

"Please note that we cannot guarantee that the adapter will fit all Losmandy polar scopes from prior years."

Peter 


Re: Question about the Adapter for the Losmandy polar scope.

Ron Yates
 

Here is a photo of the plate on the mount.  It is definitely a 1200.

 


Question about the Adapter for the Losmandy polar scope.

Ron Yates
 

Good evening all.  I have been lurking in the background for a few weeks trying to learn about the AP gtos because our astronomical society recently was given on loan an AP1200GTO.  We have a Losmandy G11 that carries a classic 1986 AP 142mm f7 Starfire which we love dearly.  When we discovered that AP sells an adapter that allows one to use a Losmandy polar scope (which we have) on the 1200 GTO we purchased one, or rather, one of our members purchased one for us.  It arrived at our observatory this last Saturday.  But when I attempted to use it, its construction made no sense to me or anyone else there.  The part number is Q8140-A.  The problem is that we definitely have a 1200GTO.  That is what it says on the plaque, and what the owner told us it was.  The manual description fits it perfectly.  However, when I look at the pictures of the two adapters sold on the AP web site, it now appears that the part that is needed looks exactly like the other adapter.  In other words, our mount has large female threads, exactly like the male threads on one end of this first adapter, but there is no way to fit it to the Losmandy polar scope on the other end of the adapter.  The losmandy polar scope has a female threaded ring that has exactly the same female threads as is on our mount.  So it would seem that what is needed is exactly like the other adapter, which has the part number Q16030 because it has those same male threads on both ends.  That part, it says on the web site, is made for the 1100 and the 1600, not the 1200.  Has anyone else had this problem?  What am I missing?

 

Ronnie Yates


Re: Mach-1 capacity

Luke Leege
 

I can't speak for the 14" but I'm pretty sure the Mach1 was designed for imaging with a 160EDF.


Re: Consequence of .5 guide on hand controller and 1x in software?

Roland Christen
 


However, the dec axis is now more difficult to turn with the clutches released
The clutches have zero to do with the backlash of the Dec axis. This is a very common misunderstanding how mounts with clutches work. Releasing or tightening the clutches has no effect on worm and worm wheel mesh. Clutches do not release the worm from the worm wheel.

Motors will sound different every time you change your socks. Or if the Moon is full or if there is a flood in Kiribati.

Rolando


-----Original Message-----
From: Tom Blahovici <tom.va2fsq@...>
To: main@ap-gto.groups.io
Sent: Mon, Jun 7, 2021 2:33 pm
Subject: Re: [ap-gto] Consequence of .5 guide on hand controller and 1x in software?

Ok.
While we are on this topic of guiding, my AP600e has 2000+ ms backlash.  This is probably why tracking can be off for me.
Although I cannot tell from the usual test of rocking the shaft back and forth, I did follow the instructions on minimizing it.  A few taps and everything seems OK.  However, the dec axis is now more difficult to turn with the clutches released and the motor occasionally sounds different than before, maybe a little labored.  There are no motor stalls though. Is everything OK if there are no motor stalls? (All of this is moot in August when I get my AP1100 but at least it will be optimized for the next user) or should I back off a bit?
Thanks

--
Roland Christen
Astro-Physics


Re: Consequence of .5 guide on hand controller and 1x in software?

Tom Blahovici
 

Ok.
While we are on this topic of guiding, my AP600e has 2000+ ms backlash.  This is probably why tracking can be off for me.
Although I cannot tell from the usual test of rocking the shaft back and forth, I did follow the instructions on minimizing it.  A few taps and everything seems OK.  However, the dec axis is now more difficult to turn with the clutches released and the motor occasionally sounds different than before, maybe a little labored.  There are no motor stalls though. Is everything OK if there are no motor stalls? (All of this is moot in August when I get my AP1100 but at least it will be optimized for the next user) or should I back off a bit?
Thanks


Re: ASCOM v2 driver #ASCOM_V2_Driver

George Vlazny
 

Hi George, thanks but I thought of that and tried them all, no go


Re: Consequence of .5 guide on hand controller and 1x in software?

Roland Christen
 

The handpad is an external app.
Whichever external app is used last will override any previous apps.

Rolando



-----Original Message-----
From: Tom Blahovici <tom.va2fsq@...>
To: main@ap-gto.groups.io
Sent: Mon, Jun 7, 2021 12:33 pm
Subject: Re: [ap-gto] Consequence of .5 guide on hand controller and 1x in software?

Hi, thanks for the explanation.
However, I do use 1x in software as well as APCC, but the hand pad is set at .5x.  Will that override the software settings?
Tom

--
Roland Christen
Astro-Physics


Re: Consequence of .5 guide on hand controller and 1x in software?

Tom Blahovici
 

Hi, thanks for the explanation.
However, I do use 1x in software as well as APCC, but the hand pad is set at .5x.  Will that override the software settings?
Tom


Re: Can I recal from the ASCOM driver?

Roland Christen
 

You can do a sync in SkyX. Works beautifully.

Rolando

-----Original Message-----
From: Mike Dodd <mike@...>
To: main@ap-gto.groups.io
Sent: Sat, Jun 5, 2021 10:26 am
Subject: [ap-gto] Can I recal from the ASCOM driver?

With an equipment change, I might need to re-balance my AP1200. I've
done this before, and am familiar with the procedure to balance in the
Park 4 (or Park 1) position, then start up, slew to a star, center it
with the keypad buttons, then do a Recal with the keypad.

Buy my keypad is disconnected and stored in the house. I'd rather not
hook it up and go through the setup to change from EXT to auto-connect,
then back to EXT afterward.

QUESTION: Can I do the Recal from the ASCOM driver window? I see the
option to use Recal for Sync, and that's always been checked, but I see
no "Recal Now" button.

If not in the ASCOM driver, I'm pretty sure I can use SkyX:
1. Slew to a star.
2. Use the driver's buttons to center the star.
3. Do a Sync in SkyX.

Since the driver is set to use Recal instead of Sync, everything is
copacetic, correct?

Thanks for all information.

--- Mike









--
Roland Christen
Astro-Physics


Re: Consequence of .5 guide on hand controller and 1x in software?

Roland Christen
 

.5x slows everything down, so it takes twice as long for the mount to respond to a move command. the way mounts work with autoguiders is the following: The guider takes an exposure and determines that the mount is off by a couple of pixels. It sends a command for the mount to move that amount, and ideally it would like to see it move instantly to the proper position. At 1x sidereal it takes 1 second to move 15 arc seconds. It takes 2 seconds at .5x and 4 seconds at .25x. That would seem to be fast enough, and for RA it might be unless you wanted to recover quickly from a 10 arc sec dither. However, there is also the Dec axis to consider. In almost all mounts, even ones with spring loaded worms and belt drives, the reversing backlash delay is anywhere between 10 and 20 arc seconds, so for really tight guiding in Dec you want the mount to be able to respond in a timely manner to a Dec reversal command. It might take a second at 1x sidereal, but at .25x it may never get there before the next move command is issued. That compounds the problem and the axis could very well overshoot if the aggressiveness is set too high.

The reason the lower guide rates were ever considered goes back to the days of hand guiding where the user would try to keep a star on a crosshair. At 1x sidereal the mount moves rather quickly at 15 arc sec/sec. Many people do not have fast response, in fact some have eye - hand response rates of up to 2 seconds. So, the .25x rates were set to make guiding a bit less frantic for the manual guide user. Autoguiders have no such limitations. The CPs can be set up to guide at 12x sidereal and still work perfectly fine. In fact, that's how the mounts with absolute encoders do their magic, the guide rate is a variable depending on how far the mount must move during Dec reversal.

Rolando



-----Original Message-----
From: Tom Blahovici <tom.va2fsq@...>
To: main@ap-gto.groups.io
Sent: Sat, Jun 5, 2021 12:48 pm
Subject: [ap-gto] Consequence of .5 guide on hand controller and 1x in software?

Hi
I have been guiding pretty well although at times, it seems to be erratic. I always though that this was seeing.
A recent thread mentioned guiding rates should be 1x in software and the hand controller. So I checked to be sure. Sure enough, the hand controller was set to 0.5x instead of 1x.
How will this effect guiding? I've had it like this for years, but have never been perfectly happy with the see saw RA graphs and the 100% agreesiveness needed for the Dec axis.
Any comments? Could this be a cause?
Thanks

--
Roland Christen
Astro-Physics


Re: ASCOM v2 driver #ASCOM_V2_Driver

George
 

George,

 

What is the button move speed set at?    You could be moving too slow to see.

 

Regards,

 

George

 

George Whitney

Astro-Physics, Inc.

Phone:  815-222-6538 (direct line)

Phone:  815-282-1513 (office)

Email:  george@...

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of George Vlazny
Sent: Monday, June 7, 2021 12:37 AM
To: main@ap-gto.groups.io
Subject: [ap-gto] ASCOM v2 driver #ASCOM_V2_Driver

 

Hi all , 

I set up my Mach 1 last night for the first time since August last year , connection was fine but when I tithe N S E W buttons nothing happens. The mount was unpacked. Slewing to a target was no problem. The only thing changed since last year is that I am now using an Eagle 3 Pro.
for the record I’m 70 and a troglodyte, quite computer illiterate.
Any idea 
George


ASCOM v2 driver #ASCOM_V2_Driver

George Vlazny
 

Hi all , 

I set up my Mach 1 last night for the first time since August last year , connection was fine but when I tithe N S E W buttons nothing happens. The mount was unpacked. Slewing to a target was no problem. The only thing changed since last year is that I am now using an Eagle 3 Pro.
for the record I’m 70 and a troglodyte, quite computer illiterate.
Any idea 
George


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