Date   

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

Sébastien Doré
 

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


Re: Mach2 - Pollux not in correct position

Eric Weiner
 

It’s not just Pollux


Re: Mach2 - Pollux not in correct position

Jeffc
 

Apologies for the lousy fuzzy picture..



On Mar 29, 2021, at 9:29 PM, Jeff Crilly <jeffcrilly@...> wrote:

Also out of curiosity I checked the CP3 / 1100 keypad which I loaded last week with a fresh DB after battery replacement.  

It is correct. 

<image.jpg>




On Mar 29, 2021, at 8:11 PM, Mike Pigney via groups.io <mpigney@...> wrote:

Check out Porrima to see if it is also incorrect.

Mike


Re: Mach2 - Pollux not in correct position

Jeffc
 

Also out of curiosity I checked the CP3 / 1100 keypad which I loaded last week with a fresh DB after battery replacement.  

It is correct. 





On Mar 29, 2021, at 8:11 PM, Mike Pigney via groups.io <mpigney@...> wrote:

Check out Porrima to see if it is also incorrect.

Mike


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

Tom Blahovici
 

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

Kenneth Tan
 

I used these and they work well for me. Comes under various brand names but all look exactly the same. I suspect they are from the same manufacturer. 



On Tue, 30 Mar 2021 at 11:42, John Upton <upton@...> wrote:
Hi again,

   Well, I made the decision to go for Option #3 using the 12 volt to 24 volt DC-DC converter. I was sort of forced into the decision after doing quite a bit of testing of Option #1, using the raw battery voltage (~13.3 v).

   I found that running at 13.3 volts, the CP5 control box was very sensitive to voltage fluctuations. If I applied power to the mount first and then turned on the (high end) NUC mount PC, the mount's power LED would immediately turn amber even just sitting at park. I could not slew at full speed either. The CP5 would indicate a motor stall during the high speed slews and show the amber LED again. The voltage fluctuation was short enough to not show up with my digital multimeter and was not detected by the battery monitor I use with the battery. (I did not bother hooking up an oscilloscope to see how long the voltage droop lasts but expect it is very short.)

   So, I installed the 24 volt DC-DC converter. This solved the high speed slew issue and also the voltage fluctuation when powering on the NUC but introduced another issue I will need to solve. My interface to the battery is via a typical automotive 12 volt socket. The plug portion has just enough resistance in the spring loaded tip that it overheats when performing a long slew at 1800X. Doing several long slews in succession, I actually melted part of the plug without blowing the 10 Amp fuse in the plug tip. I will need to rework my battery box to provide a direct PowerPole connection bypassing the 12 v automotive socket to PowerPole pigtail adapter I am using for now.

   The net of all that is that I will use the mount at 24 volts but will need to beef up my battery interface before using 1800X slews. For now, I'll use 1000X until I can wire in a dedicated 24 v PowerPole socket straight to the battery.


John

6841 - 6860 of 84287