Date   

Re: Mach2 Slew Speed, Power, and Voltage Question #Mach2GTO

John Upton
 

Mike,

   Thank you so much! That seals it then; I will continue to use the 24 volt converter for a dedicated power connection to the Mach2. I can understand the need for the hysteresis although I had not considered that aspect before. Nice touch! Thanks again for the details.

John


Re: Mach2 Slew Speed, Power, and Voltage Question #Mach2GTO

michaeljhanson@...
 

Gents,

To answer the prior question, the input voltage threshold for limiting the max slew speed to 1200x is 19.0 volts on the way up, and 18.0 volts on the way down.  Meaning, you're limited to 1200x until the input voltage rises above 19.0,  Once it rises above 19.0, you'll retain 1800x unless the input voltage then drops below 18.0. The 1.0V hysteresis window is to avoid "flickering" back and forth between thresholds.  Realize there will be losses in the power cable, and a (Schottky) diode voltage drop in the unit as well.  So, the input voltage seen by the GTOCP5 will be lower than what is reported at a power supply.  This means a 19.0 volt power source will not quite allow you to get 1800x slew rate.

Regards,
Mike Hanson


Re: Mach2 Slew Speed, Power, and Voltage Question #Mach2GTO

Seb@stro
 

John,

I am where I want to be. I am using a NUC10 system with an i7 six core processor. I spec'ed it that way for several reasons.

Of course, only you know your requirements.  With such a beast, I suppose you can Live Stack, watch a 4K/60fps movie and play GTA-V while you do planetary imaging... (Does it make coffee ? kidding 😉). To me, apart from low power, size and weight were also a main consideration as it'll be piggybacked on an EdgeHD 8 + small refractor riding the Mach2.

FWIW, the NEO comes with 8GB DDR4 2400MHz (upgradable to 16) and a Quad-core CPU clocked at 1.5 GHz (turbo up to 2.8), 240GB SATA SSD and only cost around $300. But I haven't tried it in the field yet, so real world power consumption is TBD.

Nice battery box BTW.

I am a bit surprised no one from AP answered your original question yet (max slew speed vs input voltage threshold). That would interest me as well. For now anyway, I'll stick with 12V all around as I don't need the ultrafast slewing.

Sébastien

_._,_._,_


Re: 2021 production plans for the 1600GTO?

Brian McFarland
 

Hello Karen,

Thank you for the reply! I have to admit I'm a little surprised at all this.  I've shopped with OPT for years and always had good experiences, and they are a solid supporter of our local astronomy club and our outreach efforts.  Now it sounds like I unknowingly provided them with an interest-free loan!

Having said all that I'm inclined to let it ride, at least for now. I can always get a refund from them if things look like they're going south.  The timeline you describe is fine (I'm not in a huge hurry), and in fact prior to my "loan to OPT", I signed up on your website for notification to be added to the waiting list (I think that's what it's called). At any rate, I look forward to receiving and installing it in my observatory in the near future.

Thank you again,

Brian McFarland


Re: Refining Pempro PEC curves?

Ray Gralak
 

The curves should be added unless the original curve had to be inverted before uploading.

-Ray

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Tom Blahovici
Sent: Tuesday, March 30, 2021 9:36 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Refining Pempro PEC curves?

Hi Ray,
I have not actually tried this. I'm just trying to understand what is going on. In the files section here is a post from
Roland, where he does this for the 1100. It's the first folder in the list. Here he subtracts the curve which makes more
sense. In your tutorial you show it being added.
Tom


Re: Refining Pempro PEC curves?

Tom Blahovici
 

Hi Ray,
I have not actually tried this. I'm just trying to understand what is going on. In the files section here is a post from Roland, where he does this for the 1100. It's the first folder in the list. Here he subtracts the curve which makes more sense. In your tutorial you show it being added.
Tom


Re: Mac Desktop version of SkySafari Updated today to 6.8.X

midmoastro
 

Thank you. You were clear I just had 'ipad version' stuck in my head for some reason. After going to the App Store and searching for SkySafari 6 Pro, I can see the update. 


Re: Mac Desktop version of SkySafari Updated today to 6.8.X

Allen Ruckle
 

midmoastro,

maybe I wasn’t clear enough,  this is the Mac OS version of SkySafari that is now available,  updated to include the Astro-Physics mount parking positions that have been available since January in the iOS version.

aruckle


Re: Mac Desktop version of SkySafari Updated today to 6.8.X

midmoastro
 

Thanks for this. I wonder how far behind MacOS will be. I'd like to get this update for my Mac.


Re: Mach2 Slew Speed, Power, and Voltage Question #Mach2GTO

Kenneth Tan
 

Most NUCs will run on 12 v but if it drops below that it will Cut off. So better to be higher or if not to get a voltage stabiliser

On Tue, 30 Mar 2021 at 20:57, ap@... <ap@...> wrote:

That’s not necessarily true.  If you browse the specifications at the Intel site, it varies a lot.  Some generations are strictly 19v, some are a mixture of 12-24v, some 12-19v.   It varies by CPU (maybe and kit but it looked more like CPU).

 

The marketing literature is often vague, but Intel publishes the actual requirements.  Here’s an example side by side of two 11th gen models:

 

https://ark.intel.com/content/www/us/en/ark/compare.html?productIds=205038,212519

 

The first is 19 only, the second 12-24.

 

Buy carefully.

 

 

From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Tom Blahovici via groups.io
Sent: Tuesday, March 30, 2021 12:18 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Mach2 Slew Speed, Power, and Voltage Question #Mach2GTO

 

Hi

BTW, if you are using an Intel NUC, 19V is not necessary. They work just fine at 12V as per specs.
My NUC is an i5 with SSD, and thurnderbird 3 to 10G Base T adapter. It works reliably with no issues.
Might save a little space and battery power.
Tom


Re: Mach2 Slew Speed, Power, and Voltage Question #Mach2GTO

John Upton
 

Seb@stro & Kenneth Tan.

   Regarding the suggestions that I need a lower power mount-side computer, I am where I want to be. I am using a NUC10 system with an i7 six core processor. I spec'ed it that way for several reasons. You are right that DSO imaging is not very taxing on a PC. However, there are other imaging methods than just long exposure DSO and some of them require more compute cycles from the CPU.

   I built my mount-side mini-PC to be power efficient in normal use. The NUC is running with 16 GB RAM and 500 GB fast NVMe storage. If I turn it loose, it draws as much as 90+ Watts. However, I use a custom configuration which allows it to run DSO imaging at an average of about 12 W with an average of 15% CPU utilization. I think that compares well to lower end Mini-PCs which run at similar power levels of 8 to 12 W at 50% or higher CPU utilization.

   I have plenty of battery power available to me. As of now with the Mach2, it is about the highest power consumption component of my imaging rig. My testing so far is showing a total power usage of about 35 Watts with the Mach2, cameras, and NUC (running Cartes du Ciel, PHD2, Sequence Generator Pro, APCC Pro, and PixInsight (also with a low power configuration)). Prior to the Mach2, this was running about 24 W with my SkyWatcher mounts so the Mach2 has increased the power draw substantially. (For the benefits, though, the Mach2 is worth that extra current it uses.)

   My last set of changes for my Mach2 addition is to rewire my DIY battery box for direct output to the Mach2 using only Anderson PowerPole connections. I currently use the standard astronomy / automotive 12 v cigarette sockets for all power plugs on the battery. (That was done because I once saw a person at a regional star party whose imaging was shut down due to a failure of a custom PowerPole power cable for his rig. No one else there had a spare PowerPole cable to loan him. Lots of folks had spare cigarette cables to offer. The lesson learned by me is to make up spares of any custom cables or else keep them all standard.)

   I knew that the cigarette plug was the weak link for higher currents. It has served me well but I had never had a need to draw up to 7+ Amps through one before. It was interesting to see the effects of significant overheating inside the plug from the Mach2 high speed slews.

John


Re: Mach2 Slew Speed, Power, and Voltage Question #Mach2GTO

John Upton
 

Tom Blahovici,

On Mon, Mar 29, 2021 at 11:18 PM, Tom Blahovici wrote:
BTW, if you are using an Intel NUC, 19V is not necessary. They work just fine at 12V as per specs.
   This is not true of all NUCs. The one I am using specifically specifies that 19 volts +/- 10% (or is it 5%) is required. My NUC came with a 120 Watt power brick and doesn't always boot at 13.3 volts from the battery. Many to most of the older i5 and lower NUCs will run fine from 12 - 19 volts and even state so in the specs. This one does not.

   The main thrust of this thread is about the Mach2 power requirements. Specifically, I was looking for information on how far below the 24 volt specifications you lose the ability to slew at full 1800X sidereal speed. In the end, I find I must use 24 v for other reasons and will continue on that path.

John


Re: Mach2 Slew Speed, Power, and Voltage Question #Mach2GTO

John Upton
 

Kenneth Tan,

On Mon, Mar 29, 2021 at 11:08 PM, Kenneth Tan wrote:
I used these and they work well for me. Comes under various brand names but all look exactly the same.
   I am already using two similar devices to those you linked. One is the 19v version for the mount-side NUC and the second is the 24 v Version I am using for the Mach2. They were both referred to in my very first post as "potted DC-DC Converters". Both function very well. I have used them before on other projects also which is why I had a few sitting around as spares.

John


Re: Mach2 Slew Speed, Power, and Voltage Question #Mach2GTO

ap@CaptivePhotons.com
 

That’s not necessarily true.  If you browse the specifications at the Intel site, it varies a lot.  Some generations are strictly 19v, some are a mixture of 12-24v, some 12-19v.   It varies by CPU (maybe and kit but it looked more like CPU).

 

The marketing literature is often vague, but Intel publishes the actual requirements.  Here’s an example side by side of two 11th gen models:

 

https://ark.intel.com/content/www/us/en/ark/compare.html?productIds=205038,212519

 

The first is 19 only, the second 12-24.

 

Buy carefully.

 

 

From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Tom Blahovici via groups.io
Sent: Tuesday, March 30, 2021 12:18 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Mach2 Slew Speed, Power, and Voltage Question #Mach2GTO

 

Hi

BTW, if you are using an Intel NUC, 19V is not necessary. They work just fine at 12V as per specs.
My NUC is an i5 with SSD, and thurnderbird 3 to 10G Base T adapter. It works reliably with no issues.
Might save a little space and battery power.
Tom


Re: APCC

vsalfranc@...
 

problem solved. It was my mistake. Needs to go back to school and learn to read. :)


Re: APCC

vsalfranc@...
 

Thank you for the feedback. I followed the link all the way and when I click download nothing happen.
I will go for the APCC pro but until I can download a copy I will have to wait till this issue is resolved.
Thanks for your help.
Vince


Mac Desktop version of SkySafari Updated today to 6.8.X

Allen Ruckle
 

The iPad version of SkySafari was updated January 15th to V6.8.0, to include the added A-P park positions and Home feature, .  The Desktop version however until today had not been update to include the A-P feature updates.   Today V6.8.0,  update is available in the Apple App store.

aruckle


Re: Mach2 Slew Speed, Power, and Voltage Question #Mach2GTO

Seb@stro
 

Just bought a Minix Neo J50C-4 Max with similar features and performance to the LattePanda Alpha but with Quad-core CPU instead of dual and comes in a case + VESA mount. DDR4 memory and M.2 SATA SSD upgradable. No arduino. 10Watts.


Re: Mach2 Slew Speed, Power, and Voltage Question #Mach2GTO

Kenneth Tan
 

I find the i5 and i7s power hungry if you are using batteries . Consider the M series processors or a celeron. 

Try the latte panda alpha running win 10 pro
More than adequate . Powers off a usb c PD or if u want a 12 v supply.  Relatively cheap too . 

For those who love to tinker this will work too.... has a aduino and gpio ports




On Tue, 30 Mar 2021 at 12:18, Tom Blahovici <tom.va2fsq@...> wrote:
Hi
BTW, if you are using an Intel NUC, 19V is not necessary. They work just fine at 12V as per specs.
My NUC is an i5 with SSD, and thurnderbird 3 to 10G Base T adapter. It works reliably with no issues.
Might save a little space and battery power.
Tom


Re: Refining Pempro PEC curves?

Ray Gralak
 

Hi Tom,

Refinements can help some other mount types with PEC implementations that are not very good, but you should not need to refine an A-P mount's curve. Can you post the before (PEM disabled) and after PEC logs (with the new PEC table uploaded and PEM enabled)?

-Ray

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Tom Blahovici
Sent: Monday, March 29, 2021 9:00 PM
To: main@ap-gto.groups.io
Subject: [ap-gto] Refining Pempro PEC curves?

Hi
I'm trying to understand how the refine process works. There are examples in the Pempro documentation, but they
never show the resulting "Green curve".
So the idea is to do the following.
Take the initial PEC curves and upload them to the mount. Run the analysis again, and then add this to the first
curve. What would that do? It's not well explained.
Explanations?
Tom

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