Date   

Re: Mesu PA no view of Celestial Pole #mesu

Sedat Bilgebay
 

Meanwhile, Rolando's method may not work for our Mesu mounts because of the inherent slip in the system... especially with the original acceleration parameters the slip can be a couple thousand pixels.


Re: Mesu PA no view of Celestial Pole #mesu

Sedat Bilgebay
 

For the rough alignment, I used Sitech PA assist when I first installed my Mesu 200 on a fixed pier. After that, I use PHD2 drift alignment for fine tuning when needed. Last time I needed a fine tuning was some 2 years ago following an earthquake. 


Re: Mesu PA no view of Celestial Pole #mesu

Erik Stein
 

I have no view anywhere near the polar region at my location (tiny backyard on south side of my two story home in a light polluted suburb of greater Los Angeles) and initially experienced difficulties achieving polar alignment with my Mesu 200.  There is too much junk in my backyard and my setup is so close to my home's exterior wall that a magnetic compass has proven to be unreliable.  While I found PHD2 superb for fine-tuning my polar alignment, it was all but useless for getting a rough PA.  In order to use PHD2's PA routine, you need to calibrate your mount/equipment.  In order to calibrate your mount, you need a rough polar alignment (chicken or the egg?).  I wasted countless hours getting PA calibration failures in PHD2 before I figured out that my very poor PA was causing too much drift for PHD2 to calibrate.  I eventually had to resort to old school manual drift aligning to get my initial PA.  

I later discovered that the PA assist function in SiTech is extremely useful.  I start blind tracking, offset-init, then let SiTech take control to automatically build a 10+ CalStar model on my poorly aligned system, which tells me how far off my PA is, and gives clues as to which way I need to adjust.  


Re: SiTech exe not opening on Windows 10?

Dan Gray
 

Close SiTechExe somehow, reboot or cntrl/alt/del/
Go to 
C:\ProgramDat\SiTech\SiTechExe\
Find the file SiTech.cfg.
Edit it with notepad or something.
Find two variables
AlScpTicksPerRev=10000
AzScpTicksPerRev=10000

Make sure both are above 10000

I've fixed this bug in the very latest.  I was at Yerkes Observatory a couple of weeks ago, and ran into this bug, it was very confusing, and took me a few hours to find the issue.

If you want the fixed version, it's not an installer, you just replace your SiTechExe.exe with this one:

Dan


On Wed, Jun 30, 2021 at 3:09 PM Franklin <f@...> wrote:
I will also second the idea about Remote Desktop and change of resolution.


Re: Mesu PA no view of Celestial Pole #mesu

Yann-Eric Boyeau
 

Hi,

Using phd2 drift align routine with my mesu was really effective and precise. No need to see celestial pole.

YE

Le 1 juil. 2021 à 20:02, David Ibarra Gómez <dibarra21@...> a écrit :


Hi,

when I placed my mesu inside the observatory I had the same problem, polaris was no longer visible. So I could no longer use polemaster with mesu adapter.

The first thing I tried was to build an adaptor like the one in the attached photo (just to jump over the observatory wall/roof). Later I realised there is an adaptor from geoptik (https://www.valkanik.com/buscadores/adaptador-geoptik-para-polemaster-a-pletinas-3-losmandy).

If the problem has to do with an avoidable "obstacle" in the line of sigth of polaris, maybe you can do the same thing.

Then you can do a coarse orientation  using polemaster and afterwards use phd2 to improve the alignment...

Regards




De: Sitechservo@groups.io <Sitechservo@groups.io> en nombre de paul K <paulskirk53@...>
Enviado: jueves, 1 de julio de 2021 10:17
Para: Sitechservo@groups.io <Sitechservo@groups.io>
Asunto: Re: [Sitechservo] Mesu PA no view of Celestial Pole #mesu
 
PHD2 also has a really easy to use Polar Alignment function which I use with my MESU. It has some nice real time visuals which show PA progress as you adjust.
Paul
<1617040917451-1.jpg>


Re: Mesu PA no view of Celestial Pole #mesu

paul K
 

PHD2 doesn't need sight of the celestial pole. It works very accurately by taking  measurements in other areas of the sky. This explains it well:

https://openphdguiding.org/man-dev/Tutorials.htm

Paul


Re: Mesu PA no view of Celestial Pole #mesu

David Ibarra Gómez
 

Hi,

when I placed my mesu inside the observatory I had the same problem, polaris was no longer visible. So I could no longer use polemaster with mesu adapter.

The first thing I tried was to build an adaptor like the one in the attached photo (just to jump over the observatory wall/roof). Later I realised there is an adaptor from geoptik (https://www.valkanik.com/buscadores/adaptador-geoptik-para-polemaster-a-pletinas-3-losmandy).

If the problem has to do with an avoidable "obstacle" in the line of sigth of polaris, maybe you can do the same thing.

Then you can do a coarse orientation  using polemaster and afterwards use phd2 to improve the alignment...

Regards




De: Sitechservo@groups.io <Sitechservo@groups.io> en nombre de paul K <paulskirk53@...>
Enviado: jueves, 1 de julio de 2021 10:17
Para: Sitechservo@groups.io <Sitechservo@groups.io>
Asunto: Re: [Sitechservo] Mesu PA no view of Celestial Pole #mesu
 
PHD2 also has a really easy to use Polar Alignment function which I use with my MESU. It has some nice real time visuals which show PA progress as you adjust.
Paul


Re: Mesu PA no view of Celestial Pole #mesu

paul K
 

PHD2 also has a really easy to use Polar Alignment function which I use with my MESU. It has some nice real time visuals which show PA progress as you adjust.
Paul


Re: Mesu PA no view of Celestial Pole #mesu

ZS1RA
 

Wow, thanks Don. This is really useful.


Re: SiTech exe not opening on Windows 10?

Franklin
 

I will also second the idea about Remote Desktop and change of resolution.


Re: Mesu PA no view of Celestial Pole #mesu

Don W
 

Hi Shaun,

No, the polemaster uses an image of the polar region to set the alignment.
But there is a way to accurately polar align without a view of the pole, using the stars at the zenith.  The process was developed  by Roland Christen at AstroPhyisics and presented on the AP forum a couple years ago.  I copied it and attached it here.

Don W


Re: SiTech exe not opening on Windows 10?

MartinC
 

Hi Michael,

I had exactly this problem after using remote desktop and changing the screen size. If you can see the icon in your task bar you can right click on it and choose the move option, then drag the app back to the desktop.

You may have a different cause but that worked for me.

Hope this helps

Best wishes 
Martin 





Re: SiTech exe not opening on Windows 10?

Franklin
 

This is just a thought, I have recently run into some issues where Windows' Forms apps (like SiTech.exe) open but are "outside" of the main desktop - they are opening with pixel coordinates outside that are off the screen. Take a look at your WindowDataSiTech.txt file, located in the same directory as the SiTech.cfg files.


Mesu PA no view of Celestial Pole #mesu

ZS1RA
 

I changed my mount from a SkyWatcher EQ6R Pro to a Mesu e200 which I purchased a year ago and have not touched it since. I was trying to get it to work with Linux and then I had a problem unrelated to astronomy and am now able to get back to imaging.

One of the first things I noticed is that the PA is not as straightforward as I was used to. The SkyWatcher has a fantastic Polar Alignment routine built into the handset and I could PA anywhere even from my "observatory" meaning my balcony where I have no view of the Celestial Pole due to buildings so my "horizon" is at 40 deg and I live at -26 deg (I live in South Africa). Unfortunately this amazing PA routine is not available on the Mesu so I am planning to purchase a Polemaster to assist with PA.
 
My question is, can the Polemaster do PA without a view of the South Celestial Pole?
 
TIA.
 
Shaun
 


SiTech exe not opening on Windows 10?

Michael Harvey
 

I am in the process of setting up a new Observatory computer... and...

Servo Config is working.

but, SiTechExe launches and I get the splash screen then nothing...?

It says it is open in the dock, but cannot get the config window to appear...?

Any help gratefully received!

Regards,

Michael


Re: Sideral tech issue - device flashing and not starting

Don W
 

Hi Damien,

If the flashing LED is about 1 per second, then the controller channel is "in Blinky" which is a safety mode, indicating the controller has detected an error.  There are lots of things that could cause this - overload amperage on the servo motor, low voltage, motor and encoder directions crossed.

Sidereal Technologies has a manual for the Servo II at:
http://siderealtechnology.com/ServoDoc.pdf

Here is a paragraph from that manual that describes the flashing:

LED OPERATION:There are two LED's on the controller, labeled LED 1 and LED 2. These LED's can keep you informed about what is happening with the controller.Normally, LED 1 indicates the status of the Altitude/Declination motor, and LED 2 indicates the status of the Azimuth/Right Ascention motor. If the LED has a steady 1 second period blink, then that motor has been forced to manual by a command from the serial port, or by sensing motor runaway. Motor runaway is caused by 3 possible scenarios, Faulty motor encoder or motor encoder wiring, phasing backwards between motor polarity and motor encoder pulses, or motor can't run as fast as it is being told to run. To return to automatic mode, the controller must be powered down, then powered up again, or the command to return to Auto must be given via a command on the serial port. If you are using version 1.6 (or later) of the SiTech Servo firmware, you can also press the top left and the top right buttons on the handpad simultaneously, and both motors will be returned to automatic.

Don W


Sideral tech issue - device flashing and not starting

Damien Van Holm
 


Hi all,

We equiped our german astrograph with Sideral Tech servo II device.
We did the cabling following the wiring plan on the website. All cabling twice checked, and then the motors were working fine.

So, the startup phase is working fine (all leds are flashing), and then it remains the bottom left motor status (under ATL/DEC motor) LED flashing.quite fast.
Could someone had this behaviour before?

Thanks for any info about htis.


Kind regards,
Damien



Re: Gurley on a Losmandy Titan

Serge Antonov
 

Not quite.

The readhead (configured for 8192 steps) will generate:

8192 * (100mm*π/2) = 8192 * 157.0796 = ~1,286,796 tics per revolution.

Best Regards,
Serge.

On 29 Jun 2021, at 2:59 am, Rory Duncan <duncanrmail@...> wrote:

OK, so check my math.
I have a 100mm Diameter shaft, or .314159 meters circumference
these tapes/encoder (RKLC20-S/VIONiC) look like they have a +- 5 micron accuracy. So .000005 meters per "tick" Dividing those 2, I only see 62,831 ticks per rev.. Do these read in quadrature like some rotary encoders do? Is that really enough to do tick management? Have I dropped a sigfig somewhere? the other two open style encoders seem to be the same, or worse...
RAD



On Mon, Jun 28, 2021 at 12:29 PM Don W <westergren@...> wrote:
Hi Rory,

Search Renishaw encoders.  They have two types of tape/encoders - Optical and Magnetic.  The Optical read heads need mor precision and must be mounted closer to th tapes, while the Magnetic are very tolerant and easy to setup (they sense across a greater distance.  The magnetic tapes are not as high resolution.  They should get you around 400K to 500K with your 100mm shaft.

Don W




Re: Gurley on a Losmandy Titan

Che
 

I used the RGH22 series readhead with the required RGS20-s scaletape.  The readheads come in different resolutions.  For my setup I have a 1um readhead.  With the scaletape attached to my 5 inch diameter ra axis i get just under 400k encoder tics.  I've been using this  setup for many years and it has performed very well.  I obtained all my parts thru ebay.  Pics attached


Re: Gurley on a Losmandy Titan

Rory Duncan
 

OK, so check my math.
I have a 100mm Diameter shaft, or .314159 meters circumference
these tapes/encoder (RKLC20-S/VIONiC) look like they have a +- 5 micron accuracy. So .000005 meters per "tick" Dividing those 2, I only see 62,831 ticks per rev.. Do these read in quadrature like some rotary encoders do? Is that really enough to do tick management? Have I dropped a sigfig somewhere? the other two open style encoders seem to be the same, or worse...
RAD



On Mon, Jun 28, 2021 at 12:29 PM Don W <westergren@...> wrote:
Hi Rory,

Search Renishaw encoders.  They have two types of tape/encoders - Optical and Magnetic.  The Optical read heads need mor precision and must be mounted closer to th tapes, while the Magnetic are very tolerant and easy to setup (they sense across a greater distance.  The magnetic tapes are not as high resolution.  They should get you around 400K to 500K with your 100mm shaft.

Don W

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