Date   

Re: External Power #EXOS2 #starparty #TECHNICAL

Skull HQX
 

Thanks Jerry,

It's good to know it has reverse polarity protection. But I'm not going to test it!

Last year I blew up a €400 synthesizer because I mistakenly plugged in a feed that actually was 9V center-pin negative. Most guitar fx pedals use 9V center-pin negative and the plug is the same 2.1x5.5mm one a lot electronic music instruments use. Those guitar fx pedals are used with synthesizers btw. I can't play guitar and it even can be argued I can't play keys! But I digress.

Strangely my most expensive guitar fx pedal, an Eventide H9 Max, is center-pin positive with a 2.5x5.5mm barrel, but it fits the 2.1x5.5mm plug... So what could possibly go wrong. Yeah, I also managed to blow up that one some time after that first mistake. No working reverse-polarity protection on that thing either! And that is a €700 device. I was mad at myself (something like that never happened to me before in my life) but after ordering a 25ct SMD part I could easily repair it. The synthesizer though... I could bring it back to life (took an ever cheaper part) and even get it to boot, but part of the processor that holds the programming was dead and couldn't hold a reflash. I gave up repairing it.

Since then I have color coded all plugs and leads. And never again will assume a device has a robust reverse-polarity protection! :-)

Clear skies!
 

On Sat, Feb 8, 2020 at 5:37 PM Jerry Hubbell - Explore Scientific VP Engineering <jrh@...> wrote:
On Sat, Feb 8, 2020 at 06:20 AM, Skull HQX wrote:
I’m not sure if the mount has a robust reverse polarity protection but you don’t want to find out the hard way!
Yes, the mount controller has reverse polarity protection on the 12 Vdc input power. The connector is 2.1 x 5.5 mm with the pin at 12 Vdc.
https://www.digikey.com/products/en?keywords=CP-037A-ND

Jerry Hubbell
Vice President of Engineering

Explore Scientific, LLC.
jrh at explorescientific.com

www.explorescientificusa.com
1010 S. 48th Street
Springdale, AR 72762
1-866-252-3811

Author: Scientific Astrophotography: How Amateurs Can Generate and Use Professional Imaging Data
             Remote Observatories for Amateur Astronomers: Using High-Powered Telescopes From Home


Mark Slade Remote Observatory (MSRO) IAU MPC W54 Equipment
Wilderness, VA
Mounts
: ES PMC-Eight G11 + Telescope Drive Master (TDM)
Scopes: ES 165 FPL-53 ED APO CF, ES 102 FCD100 ED APO CF
Cameras:  QHY174M-GPS + FW, QHY163C
Misc: 3-inch 0.7x Focal Reducer Field Flattener, Filters: Luminance,
Red, V-band Photometric, Diffuser, 200 lpmm Spectral Grating

Software: MaxIm DL 6, Cartes du Ciel, Astrometrica, AstroImageJ, AutoStakkert!


Re: PMC-Eight for other mounts?

Jerry Hubbell - Explore Scientific VP Engineering
 

On Sat, Feb 8, 2020 at 01:36 AM, Charles Botkin wrote:
I believe that the drive pulses and gear ratios can be adjusted to match almost any mount ? Or did I read the information wrong?
Doing atm work is something I do enjoy, but why would I buy the G-11 kit and not the EZOS2-GT and supply my own motors and brackets ?

Hi Charles,  thanks for your question. Yes, the PMC-Eight can be configured and used on any mount as a DIY project.
The PMC-Eight Programmer's Reference provides a lot of good information you would need:
http://02d3287.netsolhost.com/pmc-eight/PMC_Eight_ProgrammersReferenceManual_Release2_2019_March_07.pdf

The retrofit for the G11 is only for those that have a G11 that they want to upgrade, it includes shipping the mount back to us for the mechanical upgrades and for servicing. We also test the mount and bring it up to the level of the new G11 PMC-Eight mounts that we sell. We install and test everything and you get a like new updated G11 PMC-Eight mount back. That is why the cost is more than you might spend if we just offered it as a DIY kit, which we do not do.

There are a couple of things you can do since we do not sell the controller boards separately and that will save you quite a bit of money compared to the G11 PMC-Eight upgrade. I think it is important to state that if you go the DIY route we would not provide any warranty for the PMC-Eight system installed on your DIY mount.

Depending on the size of the mount you want to add the PMC-Eight system to, you can either buy an iEXOS 100 PMC-Eight mount with the small controller board (Model 1A-01C) and NEMA 11 motors or the EXOS 2 PMC-Eight with the large controller board and the NEMA 11 motors. If you opt for the EXOS 2 PMC-Eight, then you can buy your own larger NEMA 17 motors and use it with the large board controller (Model 2A-06B). Either way you would need to purchase your own belt/pulley system or you could use the ones provided if it would work on your DIY mount.

The basic equation for calculating the total motor counts which is the main value needed to scale the gear train correctly is:

Total Motor Counts = Ring Gear Teeth x Pulley Ratio x Motor steps/rev x 32 microsteps/step

So for the G11 this is:  360 x 1 x 400 x 32 = 4,608,000 total counts. The arcseconds/microstep = 1,296,000 / 4,608,000 = 0.28125 arcseconds/microstep
For the EXOS 2 this is: 144 x 4.5 x 200 x 32 = 4,147,200 total counts. The arcseconds/microstep = 1,296,000 / 4,147,200 = 0.3125 arcseconds/microstep

The only other thing to set is the motor current. This is not user configurable, but I do provide versions of the firmware that set different motor currents. You can use those to select the motor current and then set the total motor counts in the ASCOM driver (it is hardcoded for our mounts, I would need to update the driver to support custom motor counts, or you could change the driver yourself) or the ExploreStars application which allows you to set the motor counts.

I have built a prototype Celestron CGE PMC-Eight mount for a friend of mine that we are using at our MSRO Observatory. It works very well. 


  
Jerry Hubbell
Vice President of Engineering

Explore Scientific, LLC.
jrh at explorescientific.com

www.explorescientificusa.com
1010 S. 48th Street
Springdale, AR 72762
1-866-252-3811

Author: Scientific Astrophotography: How Amateurs Can Generate and Use Professional Imaging Data
             Remote Observatories for Amateur Astronomers: Using High-Powered Telescopes From Home


Mark Slade Remote Observatory (MSRO) IAU MPC W54 Equipment
Wilderness, VA
Mounts
: ES PMC-Eight G11 + Telescope Drive Master (TDM)
Scopes: ES 165 FPL-53 ED APO CF, ES 102 FCD100 ED APO CF
Cameras:  QHY174M-GPS + FW, QHY163C
Misc: 3-inch 0.7x Focal Reducer Field Flattener, Filters: Luminance,
Red, V-band Photometric, Diffuser, 200 lpmm Spectral Grating

Software: MaxIm DL 6, Cartes du Ciel, Astrometrica, AstroImageJ, AutoStakkert!


Re: External Power #EXOS2 #starparty #TECHNICAL

Wes Mcdonald
 

Pin is positive 12v.
Wes

--
Wes, Southport NC
PMC-8, ES ED 127, 10" LX200GPS, Astro-Tech 8" Newt, ETX-90
Polemaster, Orion ST-80 and SAG
Electrical Engineer, Retired


Re: External Power #EXOS2 #starparty #TECHNICAL

Jerry Hubbell - Explore Scientific VP Engineering
 

On Sat, Feb 8, 2020 at 06:20 AM, Skull HQX wrote:
I’m not sure if the mount has a robust reverse polarity protection but you don’t want to find out the hard way!
Yes, the mount controller has reverse polarity protection on the 12 Vdc input power. The connector is 2.1 x 5.5 mm with the pin at 12 Vdc.
https://www.digikey.com/products/en?keywords=CP-037A-ND

Jerry Hubbell
Vice President of Engineering

Explore Scientific, LLC.
jrh at explorescientific.com

www.explorescientificusa.com
1010 S. 48th Street
Springdale, AR 72762
1-866-252-3811

Author: Scientific Astrophotography: How Amateurs Can Generate and Use Professional Imaging Data
             Remote Observatories for Amateur Astronomers: Using High-Powered Telescopes From Home


Mark Slade Remote Observatory (MSRO) IAU MPC W54 Equipment
Wilderness, VA
Mounts
: ES PMC-Eight G11 + Telescope Drive Master (TDM)
Scopes: ES 165 FPL-53 ED APO CF, ES 102 FCD100 ED APO CF
Cameras:  QHY174M-GPS + FW, QHY163C
Misc: 3-inch 0.7x Focal Reducer Field Flattener, Filters: Luminance,
Red, V-band Photometric, Diffuser, 200 lpmm Spectral Grating

Software: MaxIm DL 6, Cartes du Ciel, Astrometrica, AstroImageJ, AutoStakkert!


Re: PMC-Eight for other mounts?

Steve Siedentop
 

The PMC Eight will bolt on to a G-11 with the included mounting plates.  If you’re getting a second hand G-11, do yourself a favor and get the one piece worm blocks.  You will eventually have to adjust a G-11 and the two piece worm block will be exercise in frustration.  The RA extension is really nice also as it lets you separate the mount into two pieces for easier transport.

As far as other mounts go, you’ll need to figure out how to secure the motors to the mount.  There will be other settings to configure, but I’m not at my desk right now and can’t give you any screenshots.  Perhaps Jerry can chime in.

A TDM is nice to have but not required.  However, if you’re going to do long exposure astrophotography, you’ll need to use an autoguider or a TDM.  If your setup will be portable, stick with autoguiding.

-Steve



On Fri, Feb 7, 2020 at 6:05 PM Wes Mcdonald <wesmcd6@...> wrote:
The PMC8 is not integrated to encoders....have to ask Jerry if that is in the cards.  The losmandy upgrade employs a TDM to manage the velocity of the shaft and has its own high res encoder not interfaced to the PMC8.


At least I believe all of the above is correct.

The only magic about putting in a PMC 8 on another scope would be working out the drive chain.  

Wes

--
Wes, Southport NC
PMC-8, ES ED 127, 10" LX200GPS, Astro-Tech 8" Newt, ETX-90
Polemaster, Orion ST-80 and SAG
Electrical Engineer, Retired


--
Mounts: ES PMC-8 G11 with Ruland Couplers and One Piece Worm Blocks, Skywatcher NEQ-6
Scopes: ES ED127CF FCD100, Orion 6” Mak, Stellarvue SV80EDT, Coronado Solarmax 40
Cameras:  CentralDS CDS-600, CentralDS Astro 60D, Orion Starshoot SSAG
Msc: Moonlite Focusers, Astrozap Dew Straps, Pegasus Ultimate PowerBox
Software: PixInsight, Cartes du Ciel, BackyardEOS, SkySafari


Re: PMC-Eight for other mounts?

Wes Mcdonald
 

Charles

You change the number of pulses per revolution in the app and I think in the ascom driver too....

Why would you buy a exos2-gt and put stepper motors on it and then try to purchase a PMC and interface it etc, when you can purchase the exos2-gt PMC8 as a package?  Btw I don't think ES has or sells PMC8 controllers stand-alone.

Tell you what.  If you want to build something sweet, get yourself an exos2-gt PMC8 and build you and me the spring loaded worm modification I have designed?  With that we can reduce the backlash to about zip and probably reduce the PE also.  You could source kits for the community.  The idea is you modify the existing worm block and machine two slides.  The springs and things come from McMaster Carr.  It's a snap.  If you have a mill.

You should probably go private on this if you are interested.  

Wes

--
Wes, Southport NC
PMC-8, ES ED 127, 10" LX200GPS, Astro-Tech 8" Newt, ETX-90
Polemaster, Orion ST-80 and SAG
Electrical Engineer, Retired


Re: External Power #EXOS2 #starparty #TECHNICAL

Skull HQX
 

This will depend on the capability of such a converter. 

I’ve tested with a big powerbank that has a 9 and 12V output option and that seemed to work. On average the power draw was about 5W nominal if I remember correctly.

I’ve also tested with a couple smaller powerbanks and two larger ones, that only have USB out and plugged in a ‘standard’ USB to 12V adapter cable. For some of those powerbanks it would boot the mount and WiFi could be connected. For some that even didn’t work. Working the mount proved unstable or impossible. 

So the only real option would be a good quality powerbank that has a 12V output that can provide enough (peak) power.

Be aware your cable needs to have the correct polarity at the mount. I’m not sure if the mount has a robust reverse polarity protection but you don’t want to find out the hard way!

Clear skies.

Op za 8 feb. 2020 om 12:07 schreef <johntolliday433m@...>

I see this thread dates back to November but wanted to make a suggestion / query:
Lithium batteries are affordable (compared to LiFePO4) and small enough to carry onto an aircraft (thinking - solar eclipse trip).
The problem is that they discharge reducing their output voltage. My TalentCell 6000mAh is down to 10.4V at 50% charge.
Here is a suggestion: Use a Buck Boost converter. These cost around £12 GBP on Amazon plus a small project box to put it in.
My question is whether the EXOS-100 PMC-Eight mount is compatible with these converters as they control the voltage by Pulse Wave Modulation.
Does anyone know?? 


Re: External Power #EXOS2 #starparty #TECHNICAL

@JohnDT
 

I see this thread dates back to November but wanted to make a suggestion / query:
Lithium batteries are affordable (compared to LiFePO4) and small enough to carry onto an aircraft (thinking - solar eclipse trip).
The problem is that they discharge reducing their output voltage. My TalentCell 6000mAh is down to 10.4V at 50% charge.
Here is a suggestion: Use a Buck Boost converter. These cost around £12 GBP on Amazon plus a small project box to put it in.
My question is whether the EXOS-100 PMC-Eight mount is compatible with these converters as they control the voltage by Pulse Wave Modulation.
Does anyone know?? 


Re: PMC-Eight for other mounts?

Charles Botkin
 
Edited

I believe that the drive pulses and gear ratios can be adjusted to match almost any mount ? Or did I read the information wrong?
Doing atm work is something I do enjoy, but why would I buy the G-11 kit and not the EZOS2-GT and supply my own motors and brackets ?

 


Re: PMC-Eight for other mounts?

Wes Mcdonald
 

The PMC8 is not integrated to encoders....have to ask Jerry if that is in the cards.  The losmandy upgrade employs a TDM to manage the velocity of the shaft and has its own high res encoder not interfaced to the PMC8.


At least I believe all of the above is correct.

The only magic about putting in a PMC 8 on another scope would be working out the drive chain.  

Wes

--
Wes, Southport NC
PMC-8, ES ED 127, 10" LX200GPS, Astro-Tech 8" Newt, ETX-90
Polemaster, Orion ST-80 and SAG
Electrical Engineer, Retired


Re: PMC-Eight for other mounts?

Skull HQX
 

I believe ES has a kit to upgrade a Losmandy G11 with PMC-Eight GoTo capabilities. It’s not cheap, but that’s relative. Maybe you could use that?

To be honest, what you want to do might be more trouble than it is worth. Unless that is something you will enjoy?

Clear skies!



Op vr 7 feb. 2020 om 21:47 schreef Charles Botkin via Groups.Io <charlesbotkin=yahoo.com@groups.io>

I am looking at getting the PMC-Eight to convert a non go-to mount into a go-to.
From what I have read it seems this would be a nice solution compared to building an on-step, but can encoders be used with the PMC-Eight ?


PMC-Eight for other mounts?

Charles Botkin
 

I am looking at getting the PMC-Eight to convert a non go-to mount into a go-to.
From what I have read it seems this would be a nice solution compared to building an on-step, but can encoders be used with the PMC-Eight ?


Re: Incorrect Password iPad #iEXOS-100

Wes Mcdonald
 

John

I don’t know how Skull knew you had that dongle in there but what a guess.

The dongle is used to change the wifi channel number.  Each time the thing is inserted and removed the WiFi channel number employed by the pmc8 advances by 1.  It is my view the thing should be operated at channel 1, 6, or 11. The PMC8 is shipped on some other of the 11 possible channel numbers.  Btw when the channel number gets to 11 the next dongle insert/ removal rolls it back to 1.

Note as Skull said the WiFi won’t function with the dongle installed.

Regards
Wes

--
Wes, Southport NC
PMC-8, ES ED 127, 10" LX200GPS, Astro-Tech 8" Newt, ETX-90
Polemaster, Orion ST-80 and SAG
Electrical Engineer, Retired


Re: Home Position Alignment #EXOS2 #polaralignment

Skull HQX
 

You can always create a browser bookmark or copy and paste the url into a notepad (or similar) document. :-)


On Thu, Feb 6, 2020 at 11:31 PM Timothy Myers <tim_s_myers@...> wrote:
Very good information from everyone. Is there a way to save a thread for future reference?
--
Tim Myers

Telescopes:     Celestron 4SE, Celestron 8SE
Mounts:           4-5 SE, 6-8SE, EXOS-2GT with PMC-Eight
Cameras:        ASI1600ME, Cooled
Tablets:           Asus Nexus 7


Re: Incorrect Password iPad #iEXOS-100

Skull HQX
 

Well, you are not the first one to make that mistake. I'm guilty as charged.

Glad I could help.

Btw, I have found the quality of power delivery to the mount is important too to have it function correctly.
That would have been my next suggestion as I don't think the usage of a hyphen in a password could really be a problem.

Clear skies. 

On Fri, Feb 7, 2020 at 1:27 PM <johntolliday433m@...> wrote:
Solved! Removing the Channel dongle worked. Thanks Skull HQX!
I don't understand what the dongle is needed for!


Re: Incorrect Password iPad #iEXOS-100

@JohnDT
 

Solved! Removing the Channel dongle worked. Thanks Skull HQX!
I don't understand what the dongle is needed for!


Re: Incorrect Password iPad #iEXOS-100

Jerry Hubbell - Explore Scientific VP Engineering
 

On Fri, Feb 7, 2020 at 07:07 AM, <johntolliday433m@...> wrote:
The hyphen may be the issue but no joy with cutting and pasting the password.
Any suggestions welcomed!
HI John,

Welcome to the forum, I am sorry you are having issues.

If I recall, we have seen this problem one other time but it was related to the language selected on the device. You are correct in that it is probably the hyphen that is hanging things up. You said it worked on your Windows device so to verify, you used the password "PMC-Eight" on your Windows laptop and it worked fine, is that correct?  If so then you have verified that that is the correct password for the SSID. 

After thinking about it, can you try switching languages to another language such as French, and then back to English on your device to see if that helps. Make sure your keyboard is also US to get that out of the way.

Thanks

Jerry Hubbell
Vice President of Engineering

Explore Scientific, LLC.
jrh at explorescientific.com

www.explorescientificusa.com
1010 S. 48th Street
Springdale, AR 72762
1-866-252-3811

Author: Scientific Astrophotography: How Amateurs Can Generate and Use Professional Imaging Data
             Remote Observatories for Amateur Astronomers: Using High-Powered Telescopes From Home


Mark Slade Remote Observatory (MSRO) IAU MPC W54 Equipment
Wilderness, VA
Mounts
: ES PMC-Eight G11 + Telescope Drive Master (TDM)
Scopes: ES 165 FPL-53 ED APO CF, ES 102 FCD100 ED APO CF
Cameras:  QHY174M-GPS + FW, QHY163C
Misc: 3-inch 0.7x Focal Reducer Field Flattener, Filters: Luminance,
Red, V-band Photometric, Diffuser, 200 lpmm Spectral Grating

Software: MaxIm DL 6, Cartes du Ciel, Astrometrica, AstroImageJ, AutoStakkert!


Re: Incorrect Password iPad #iEXOS-100

Skull HQX
 

You should not have the channel dongle inserted in the mount. That might be the cause.

Regards

Op vr 7 feb. 2020 om 13:07 schreef <johntolliday433m@...>

Hi,
My problem is that attempting to connect my iPad mini to my iEXOS-100 using the Password 'PMC-Eight' returns 'incorrect password'.
There is no no problem connecting my Windows 10 laptop.
I have tried various remedies - including logging on using network 'other...', resetting the network in Settings and changing from a UK to a US keyboard.
My old iPhone 5s also generates 'incorrect password'. The hyphen may be the issue but no joy with cutting and pasting the password.
Any suggestions welcomed!


Incorrect Password iPad #iEXOS-100

@JohnDT
 

Hi,
My problem is that attempting to connect my iPad mini to my iEXOS-100 using the Password 'PMC-Eight' returns 'incorrect password'.
There is no no problem connecting my Windows 10 laptop.
I have tried various remedies - including logging on using network 'other...', resetting the network in Settings and changing from a UK to a US keyboard.
My old iPhone 5s also generates 'incorrect password'. The hyphen may be the issue but no joy with cutting and pasting the password.
Any suggestions welcomed!


Re: ASUS Nexus 7 #EXOS2 #ExploreStars

Jerry Hubbell - Explore Scientific VP Engineering
 
Edited

On Thu, Feb 6, 2020 at 10:52 AM, Pavel wrote:
which is not explained very well in the documentation
The links to all the information on the mount system is on the Main page of this forum and include links to the extensive Knowledge Base articles and the software, user manuals, and other downloads.  

https://espmc-eight.groups.io/g/MAIN

https://explorescientificusa.com/pages/explore-scientific-knowledge-base-and-faqs

It's all there on the first page one goes to to join the forum.
 
--
Jerry Hubbell
Vice President of Engineering

Explore Scientific, LLC.
jrh at explorescientific.com

www.explorescientificusa.com
1010 S. 48th Street
Springdale, AR 72762
1-866-252-3811

Author: Scientific Astrophotography: How Amateurs Can Generate and Use Professional Imaging Data
             Remote Observatories for Amateur Astronomers: Using High-Powered Telescopes From Home


Mark Slade Remote Observatory (MSRO) IAU MPC W54 Equipment
Wilderness, VA
Mounts
: ES PMC-Eight G11 + Telescope Drive Master (TDM)
Scopes: ES 165 FPL-53 ED APO CF, ES 102 FCD100 ED APO CF
Cameras:  QHY174M-GPS + FW, QHY163C
Misc: 3-inch 0.7x Focal Reducer Field Flattener, Filters: Luminance,
Red, V-band Photometric, Diffuser, 200 lpmm Spectral Grating

Software: MaxIm DL 6, Cartes du Ciel, Astrometrica, AstroImageJ, AutoStakkert!