Re: Using the GTO keypad with the Mach2

Terri Zittritsch

Thanks Karen, I do see that the A-P forums are a little friendlier in general.   Realize that I’ll only have an A-P mount after I get my Mach2, and will be shooting through my TEC140 or other scope.  Although after seeing your fathers TEC140 at NEAF, I know I’m in good company!   Within the last couple of months I had decided I was going to try and upgrade my 100mm (500-600mm) imaging platform scope and casually thought I’d get my name on the list for a Stowaway..  nothing doing.   Any idea what year that list might open back up again, or whether I may have better luck on the secondary market?


On Sep 19, 2019, at 11:36 AM, Karen karen@... [ap-gto] <ap-gto@...> wrote:



Please do share your imaging results with us.  From what I’ve seen this group is generally very complimentary to all imagers.  If you request critique or suggestions, they’ll offer that, too.  But I think I can speak for the group when I say that we enjoy everyone’s astro images.  No one should feel down with the ants. 



From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, September 18, 2019 2:31 PM
To: ap-gto@...
Subject: Re: [ap-gto] Using the GTO keypad with the Mach2



Hi Karen, thank you for the response.. good to hear from you too.   So you satisfied my curiosity on this one.. as I was wondering if the signature was some kind of inside thing known only to long-time forum users, and given most users address your father as Roland, when he signs as Rolando, I just had to ask to make sure I wasn’t doing it wrong.   But it seems not, so exotic Rolando it will be.    I looked up Rolando, and at least one meaning for Spanish, Italian and Portuguese is "famous throughout the land", which seems appropriate in our hobby.  


I’m very excited to own one of your products and I’ll have to decide if I’m brave enough to post any of my AP results.… you have some incredibly talented users, including your father.  Being an early customer of Adam Block, when he was selling video’s out of the University of Arizona, I made the mistake of showing him some of my early DSLR AP work, and it brought me down to earth, kind of down to where the ants roam….     


One of the things I’m still wondering how to do, is how to alert my fellow astro-club members that they should expect 2-3 of months clouds around every new moon once I receive delivery.   





On Sep 18, 2019, at 12:35 PM, Karen karen@... [ap-gto] <ap-gto@...> wrote:



Hi Terri,


I’ll let the technical experts respond to most of your questions, but I can answer the last one..  When it comes to Roland’s name, you’re welcome to stick with whatever name you’re most comfortable with.  When he wants to sound official he signs his full name, Rolando is his more exotic persona, UncaRollo is what his nieces and nephews call him, and I refer to him as Dad.  He doesn’t stand on ceremony.  Use the moniker you like best.  Mr A-P might be my new favorite.  J


It’s great to hear from you, Terri, and we’re really looking forward to seeing the results from your Mach2!



From: ap-gto@... [mailto:ap-gto@...] 
Sent: Wednesday, September 18, 2019 8:28 AM
To: chris1011@... [ap-gto] <ap-gto@...>
Subject: Fwd: [ap-gto] Using the GTO keypad with the Mach2



A few more questions for the Mach2.


First, what is the counterweight need for the Mach2?  I was surprised about the larger mounts needing from 90-120% of the weight of the load.   Is this what I can expect for the Mach2 as well?  I do understand that part of this will depend on how far the load is from the axis, and right now I’m planning side-by-side mounting of scope/guide scope to keep things close to the axis.    I know this isn’t ideal and I’ll have to deal with unequal scope-saddle movement.


Secondly, I notice that the power needs show 12V/24V and 5A continuous.   Should this really be 60W continuous (12V, 5A) or will it really draw 120W (5A) at 24V?    Is this the result of the high holding current of micro-steppers on the mount?  I know when I saw the demo at NEAF the mount was resisting and correcting for bumps/wind.    I also remember hearing at some point that the mount will still track well with 20 pounds of imbalance, am I remembering this right?     I think I’ll be happy that I purchased the mighty-max sealed 55AH battery rather than the ubiquitous battery boxes with lights which contain tiny little batteries (although my arms and back will never forgive me).


Third, I’ve heard that the encoders will give me peace of mind because the mount will always know where it is.   I think I know what it means, but just to make sure my understanding is correct:    The mount knowing where it’s pointing, really only refers to knowing the absolute position of the shafts, and has nothing to do with knowing the absolute position of where the mount is pointing (the sky).   Even assuming perfect polar alignment, the mount still can’t understand where it’s pointing without some initial synchronization with at least a star or three or a model of the sky.   With a model plus the encoders, then you’ll know the absolute position (I think).  Am I thinking of this correctly?

And how practical is it to create a model of the sky when you’re using the mount in a non-permanent way?   Can I create a model in less than an hour, or is this a long process only really intended for permanent mounting and for mobile users we’ll just do a few star synchronization after polar alignment (I guess a model of sorts)?


Lastly for Mr. A-P himself, I’ve addressed you as both Roland and Rolando, and am getting uncomfortable with this ambiguity.   Everywhere outside of this forum, I’ve seen the name listed as Roland, but your signature here is shown as Rolando.   How do you prefer to be addressed?    It may seem a silly question, but I think it’s important to use the form/spelling of your name as you prefer.   I do understand they are forms of the same name.    






Begin forwarded message:


From: Terri Zittritsch <>

Subject: Re: [ap-gto] Using the GTO keypad with the Mach2

Date: September 15, 2019 at 10:47:33 AM EDT

To: "chris1011@... [ap-gto]" <ap-gto@...>


Rolando, I’ve just placed my order for all accessories including a keypad with my vendor.    Should I have waited on the keypad until the Mach2 is shipping, or is this a pretty transparent change that I’ll just get software updates for?   Just want to make sure I’m not missing something by purchasing the keypad early.




On Sep 14, 2019, at 5:46 PM, chris1011@... [ap-gto] <ap-gto@...> wrote:



Nothing has changed on the keypad physically.. Some of the buttons may change function. We don't have a final software set yet. We are adding in some things that will be very useful to imagers.






-----Original Message-----
From: Thomas Fischer manusfisch@... [ap-gto] <ap-gto@...>
To: ap-gto <ap-gto@...>
Sent: Sat, Sep 14, 2019 3:14 pm
Subject: Re: [ap-gto] Using the GTO keypad with the Mach2


Also will they be the same form factor,  i’ve just gotten used to the buttons 

Tom Fischer


On Sat, Sep 14, 2019 at 12:42 deanjacobsen@... [ap-gto] <ap-gto@...> wrote:


Thanks Roland.


When do you anticipate that the Mach2 manual and the CP5 manual will make its way to the support page?


Dean Jacobsen







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