Date   

Re: Counter weight up slew vs. continuing past the meridian, any real differences?

Geof Lewis
 

Hi,
IMHO there is no difference. I don't use APCC/APMM, but just use SGP and set any required meridian delay in the V2 driver. For me the decision is determined by what the starting position of my target is and how long I want to image it. So, if I have a target within 3 hours east of the meridian and want to image it for say 8 hours, then I'll set the meridian delay such that I start CW up and finish CW down. However, if the target is 5 hours east of the meridian and I want to image for 8 hours, then the reverse is true and I'll start CW down and finish CW up. I've never encountered any issues with slow slews, or back and forth sides, as plate solving runs. Of course, I do need to check that I won't get any pier crashes and I find it easier to monitor that with CW up at the start, knowing that if I'm good there then very likely to be good after all the way through and past the meridian.
Best regards,

Geof


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of skester@... <skester@...>
Sent: 13 March 2021 17:02
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: [ap-gto] Counter weight up slew vs. continuing past the meridian, any real differences?
 
I've seen many comments about the ability of AP mounts to slew to a counterweight up position with the scope on the east side, so that you can avoid the flip and continue west.  Assuming I want to track the target from -3hrs to +3hrs of the meridian, how if at all is this different to starting with a normal slew with the scope on the west side, and ending in the counter weight up position (assuming clearance of course)?  Earlier this week it was mentioned that due to how SGP commands the mount during a plate solve/center, starting counter weight up invokes the safety slew thus making very small adjustments quit slow.  It would seem a solution would be to just reverse the process and end rather than start counter weight up.  Am I missing something here?


Counter weight up slew vs. continuing past the meridian, any real differences?

skester@...
 

I've seen many comments about the ability of AP mounts to slew to a counterweight up position with the scope on the east side, so that you can avoid the flip and continue west.  Assuming I want to track the target from -3hrs to +3hrs of the meridian, how if at all is this different to starting with a normal slew with the scope on the west side, and ending in the counter weight up position (assuming clearance of course)?  Earlier this week it was mentioned that due to how SGP commands the mount during a plate solve/center, starting counter weight up invokes the safety slew thus making very small adjustments quit slow.  It would seem a solution would be to just reverse the process and end rather than start counter weight up.  Am I missing something here?


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

Roland Christen
 

We had a giant one up on the wall in the math lecture room at the Rochester Institute of Technology. It was used to teach incoming engineering students (like myself).

Rolando



-----Original Message-----
From: Karen Christen <karen@...>
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Sent: Sat, Mar 13, 2021 10:34 am
Subject: Re: [ap-gto] Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

This whole topic has been hilarious.  Barry wins.
Karen
AP
 
From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Barry Megdal
Sent: Friday, March 12, 2021 8:21 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)
 
Yes – that is a 6-foot slide rule on the wall.  Couldn’t resist buying it years ago at a garage sale.  These used to hang on the blackboard in my high school chemistry class so they could teach us how to use them.
 
And my new Mach2 in the foreground just to make the photo appropriate for this forum J
 
 
Dr. Barry Megdal
 
President
Shb Instruments, Inc.
19215 Parthenia St.  Suite A
Northridge, CA 91324
(818) 773-2000  (818)773-2005 fax
 
Faculty (retired)
Dept. of Electrical Engineering
Caltech
 

--
Karen Christen
Astro-Physics

--
Roland Christen
Astro-Physics


Re: Meridian Limits in APCC #APCC

Ray Gralak
 

Hi David,

 

Please make sure you have installed the latest drivers for the MGBoxV2 and that the Device DataSource is set to ASCOM as in this screenshot:

 

 

-Ray

 

> -----Original Message-----

> From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of David Johnson

> Sent: Saturday, March 13, 2021 8:28 AM

> To: main@ap-gto.groups.io

> Subject: [ap-gto] Meridian Limits in APCC #APCC

>

> I set up the meridian limits using APCC last night, and I have to say that it’s a very useful and easy-to-do process.  It’s

> one of those things that you can read about, but you really need to do it to completely understand it.  One interesting

> thing I need to keep in mind is, even with the same equipment, the meridian limits can be different.  For example, how

> my filter wheel is rotated has an effect on the pier clearance, so I’m trying to be reasonably conservative about placing

> the limits.  Same with how my focuser is rotated, since the controls do stick out from the line of the scope.  Anyway, it

> is a nice “cloudy nights” activity.


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

Karen Christen
 

This whole topic has been hilarious.  Barry wins.

Karen

AP

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Barry Megdal
Sent: Friday, March 12, 2021 8:21 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

 

Yes – that is a 6-foot slide rule on the wall.  Couldn’t resist buying it years ago at a garage sale.  These used to hang on the blackboard in my high school chemistry class so they could teach us how to use them.

 

And my new Mach2 in the foreground just to make the photo appropriate for this forum J

 

 

Dr. Barry Megdal

 

President

Shb Instruments, Inc.

19215 Parthenia St.  Suite A

Northridge, CA 91324

www.shbinstruments.com

(818) 773-2000  (818)773-2005 fax

bmegdal@...

 

Faculty (retired)

Dept. of Electrical Engineering

Caltech

 


--
Karen Christen
Astro-Physics


Meridian Limits in APCC #APCC

David Johnson
 

I set up the meridian limits using APCC last night, and I have to say that it’s a very useful and easy-to-do process.  It’s one of those things that you can read about, but you really need to do it to completely understand it.  One interesting thing I need to keep in mind is, even with the same equipment, the meridian limits can be different.  For example, how my filter wheel is rotated has an effect on the pier clearance, so I’m trying to be reasonably conservative about placing the limits.  Same with how my focuser is rotated, since the controls do stick out from the line of the scope.  Anyway, it is a nice “cloudy nights” activity.


Problem with MGBoxV2 #APCC #Mach2GTO

David Johnson
 

I’ve used my MGBoxV2 with APCC on my old computer with no problem, but I’m switching to a PrimaLuceLab Eagle 4, and I have a problem getting the MGBoxV2 connected.  I’m pretty sure I’ve installed all the proper drivers.  The error message is attached.  Any help would be appreciated.  Thanks.


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

Joe Zeglinski
 

   Since I couldn’t find an original “wall-mount”  slipstick,  I just remembered  an old Plan-B, of making my own. We now have the latest PC technology to do it very easily as a home DIY. The 6-foot, or preferably easier to handle  a 4-footer,  can be “duplicated”. I once made an “Octal” Circular slide rule, simply using my engineering drafting tools, after I graduated and started in the computer field. Computer technology now makes it far easier to do.
 
    Just scan an existing slide rule, at high resolution, section by section, and print the (coloured) sheets on say a laser printer, or have it done at a  print shop on a blueprint-sized printer. Then just glue the printed sheets unto a backing of plywood, or much lighter balsa wood, even thin sheets  (with  re-enforcement spacer ribs) of Plexiglas. Then you can have any brand or model of your old favourite slide rule, complete with accurate markings.
The difficulty is flipping it over to the log & trig functions, but even that could be done by flipping it over downwards  on  hinges.
 
    Another project, besides astronomy, that would be out of this world.
 
    Just a thought ... but thanking the group for their patience,  I should probably end this AP-GTO  off-topic, though very interesting thread. 
Joe
 
   
 

From: Don Anderson via groups.io
Sent: Friday, March 12, 2021 11:51 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)
 
Barry's is bigger than oursEmoji
 
Don Anderson
 
 
On Friday, March 12, 2021, 07:30:02 p.m. MST, Joe Zeglinski <j.zeglinski@...> wrote:
 
 
Congrats Barry,
 
...  on finding that huge Pickett. Years ago, I was looking for one as well, and finally gave up. Settled for finding the Electrical Engineering Pickett model instead.
Now, seeing yours,   I may resume that search.
 
Joe


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

Jeff B
 

What a great garage sale find.  Would be a natural for American Pickers!

I remember the huge one in college physics class.  We had an "advanced course" in it and also circular slide rules that you could stuff inside your pocket protectors with the pens.  Computer card stacks...learned real quick to always number the cards....in case you dropped the deck.....which you would eventually do.....that also carried over to numbering your viewgraph slides too.

The big intense debate in my engineering college was centered around the use of the emerging hand calculators during testing.  Their relative cost was similar to a high end cell phone today but some students had them.  Took my school, Cincinnati, a good year to allow it as they saw the handwriting on the wall......where the big slide rule used to be.

Jeff

On Fri, Mar 12, 2021 at 11:51 PM Don Anderson via groups.io <jockey_ca=yahoo.ca@groups.io> wrote:
Barry's is bigger than oursEmoji

Don Anderson


On Friday, March 12, 2021, 07:30:02 p.m. MST, Joe Zeglinski <j.zeglinski@...> wrote:


Congrats Barry,
 
...  on finding that huge Pickett. Years ago, I was looking for one as well, and finally gave up. Settled for finding the Electrical Engineering Pickett model instead.
Now, seeing yours,   I may resume that search.
 
Joe


Fun with the Mach 2...

Bill Long
 

GTX + 16803 + Mach 2 should be illegal. 🙂 Excellent star HFD on focus, all the frames tonight are excellent in terms of star roundness. Not guiding at all. 



Re: APCC shows Altitude at 0 in Park 3

Bill Long
 

Right. If Wayne issued a malformed RCAL at some point, homing the mount will clear that. As a rule of thumb with both of my encoder mounts, I use the APPM "RECAL At Zenith" option during the model build. After that finishes I do home the mount (probably not needed) and I get on my target and use APCC to do a APPM Solve and Sync. 


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Ray Gralak <iogroups@...>
Sent: Friday, March 12, 2021 11:31 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] APCC shows Altitude at 0 in Park 3
 
If the mount's site latitude and longitude are correct, just home the mount, as Bill suggested.

If the mount's latitude is wrong, power cycle the mount and make sure APCC is initializing the mount with the proper site lat/long.

-Ray

> -----Original Message-----
> From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Wayne Hixson via groups.io
> Sent: Friday, March 12, 2021 10:02 PM
> To: main@ap-gto.groups.io
> Subject: Re: [ap-gto] APCC shows Altitude at 0 in Park 3
>
> Hi Ray, I have tried that no luck. Trying reboot and restart the CP5 right now...
>
> nope. This did happen some time ago and you had a solution if I recall but can’t remember!
>







Re: APCC shows Altitude at 0 in Park 3

Ray Gralak
 

If the mount's site latitude and longitude are correct, just home the mount, as Bill suggested.

If the mount's latitude is wrong, power cycle the mount and make sure APCC is initializing the mount with the proper site lat/long.

-Ray

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Wayne Hixson via groups.io
Sent: Friday, March 12, 2021 10:02 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] APCC shows Altitude at 0 in Park 3

Hi Ray, I have tried that no luck. Trying reboot and restart the CP5 right now...

nope. This did happen some time ago and you had a solution if I recall but can’t remember!


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

David Fischer
 

My high school days were spent on an IBM 1440 (first 2 years) and a UNIVAC 1106 my senior year.  Mostly FORTRAN then COBOL, ALGOL and assembly on the UNIVAC.
-- David F.


On Fri, Mar 12, 2021 at 5:57 PM Barry Megdal <bmegdal@...> wrote:

I used to program the IBM 1620 at the neighboring junior college when I was in high school – unique thing about that machine was that internal storage was in decimal (BCD) rather than standard binary……

 

-        Barry

 

Dr. Barry Megdal

 

President

Shb Instruments, Inc.

19215 Parthenia St.  Suite A

Northridge, CA 91324

www.shbinstruments.com

(818) 773-2000  (818)773-2005 fax

bmegdal@...

 

Faculty (retired)

Dept. of Electrical Engineering

Caltech

 


Re: APCC shows Altitude at 0 in Park 3

Bill Long
 

Did you HOME the Mach 2?


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Wayne Hixson via groups.io <wayneh9026@...>
Sent: Friday, March 12, 2021 10:01 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] APCC shows Altitude at 0 in Park 3
 
Hi Ray, I have tried that no luck. Trying reboot and restart the CP5 right now...

nope. This did happen some time ago and you had a solution if I recall but can’t remember!


Re: APCC shows Altitude at 0 in Park 3

Wayne Hixson
 

Hi Ray, I have tried that no luck. Trying reboot and restart the CP5 right now...

nope. This did happen some time ago and you had a solution if I recall but can’t remember!


Re: APCC shows Altitude at 0 in Park 3

Ray Gralak
 

Hi Wayne,

That might happen if there happened to be a communications issue getting the latitude. Try restarting APCC.

-Ray

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Wayne Hixson via groups.io
Sent: Friday, March 12, 2021 9:07 PM
To: main@ap-gto.groups.io
Subject: [ap-gto] APCC shows Altitude at 0 in Park 3

Altitude at park 3 should be 47 degrees. Site is correct. This happened before, not sure what the problem is.


Wayne


Re: APCC shows Altitude at 0 in Park 3

Wayne Hixson
 

PS running a Mach2. Latest Driver, APCC and ASCOM


APCC shows Altitude at 0 in Park 3

Wayne Hixson
 

Altitude at park 3 should be 47 degrees. Site is correct. This happened before, not sure what the problem is. 


Wayne


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

Don Anderson
 

Barry's is bigger than oursEmoji

Don Anderson


On Friday, March 12, 2021, 07:30:02 p.m. MST, Joe Zeglinski <j.zeglinski@...> wrote:


Congrats Barry,
 
...  on finding that huge Pickett. Years ago, I was looking for one as well, and finally gave up. Settled for finding the Electrical Engineering Pickett model instead.
Now, seeing yours,   I may resume that search.
 
Joe


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

Don Anderson
 

Wow! Awesome Barry. How heavy is it?  Mine is a Hughes-Owens Bamboo with glass window in the slide. It is in as good a shape as when I bought it in 1969.

Don Anderson


On Friday, March 12, 2021, 07:20:52 p.m. MST, Barry Megdal <bmegdal@...> wrote:


Yes – that is a 6-foot slide rule on the wall.  Couldn’t resist buying it years ago at a garage sale.  These used to hang on the blackboard in my high school chemistry class so they could teach us how to use them.

 

And my new Mach2 in the foreground just to make the photo appropriate for this forum J

 

 

Dr. Barry Megdal

 

President

Shb Instruments, Inc.

19215 Parthenia St.  Suite A

Northridge, CA 91324

www.shbinstruments.com

(818) 773-2000  (818)773-2005 fax

bmegdal@...

 

Faculty (retired)

Dept. of Electrical Engineering

Caltech

 

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