Date   

#Mach2GTO C14Edge HD rig #Mach2GTO

Mihir
 

Hi Roland,
Can the Mach2GTO (with AP 16" EAsy balace dovetail on Eagle 6 mount) comfortably handle the below OTA and image train -

C14 Edge HD OTA 
Additional Losmandy Dovetail bar on top of OTA
C14 edge HD focal reducer
Astrodon/Farpoint AStro MOAG with mini guide camera
QHYCFW3l filter wheel
QHY268M camera
Pegasus UPBv2

Regards,
Mihir


Re: About APCC and ISS tracking and PC Time

 

>>> For GPS devices that emit standard NMEA time sentences over a serial (COM) port, there is NMEATime2 ($20) or the older, free version, NMEATime.

just for the heck of it, i purchase NMEATime2 and an inexpensive GPS receiver (something like a $30 garmin from Amazon)

it's easy to set up and use and seems to provide exceedingly accurate (and continuous) time updates to my windows setup.

i just placed the GPS puck on top of the telescope (i have my computer mounted to a top plate on the OTA)


Surprised at how easy it was to install and use 



On Mon, May 24, 2021 at 6:12 AM Dale Ghent <daleg@...> wrote:

> On May 24, 2021, at 02:43, Bob <astro@...> wrote:

> I'm really quite surprised that APCC cannot utilise gps time directly. I bought a $10 usb gps and it works well with APCC. When I went looking for the setting in APCC that would allow me to utilise the gps time instead of PC time, I couldn't find it. Now I know why.
>
> Any idea if/when this feature will be introduced?

Time syncing is complex enough of a topic that it's best to let dedicated apps which handle the intricacies involved do the driving on this. There are entire professions and academic pursuits based around just this topic, after all, so it's just not something you snap your fingers and see appear in code no matter how "easy" it might appear to the uninitiated.

On Windows:

For NTP, there is the Dimension4. This implements a more aggressive NTP client than the standard one that's built-in to Windows.

For GPS devices that emit standard NMEA time sentences over a serial (COM) port, there is NMEATime2 ($20) or the older, free version, NMEATime.

If you are operating on Linux or other type of *NIX OS, then there are many to accommodate all sorts of time sources.






--
Brian 



Brian Valente


Re: About APCC and ISS tracking and PC Time

ap@CaptivePhotons.com
 

Dale Ghent said:

For NTP, there is the Dimension4. This implements a more aggressive NTP client than the standard one that's built-in to Windows.

For GPS devices that emit standard NMEA time sentences over a serial (COM) port, there is NMEATime2 ($20) or the older, free version, NMEATime.

If you are operating on Linux or other type of *NIX OS, then there are many to accommodate all sorts of time sources.
One thing to realize is that NMEA time is inherently inaccurate, exacerbated by USB serial delays. Most GPS chips also emit a PPS or 1PPS (1 pulse per second) electrical signal that is very precise, and can be used to synchronize the information from NMEA. Essentially the later says "the time is X" and the PPS signal says "right now".

Windows cannot easily do this, and none of the GPS' that attach via USB can do this.

It is unclear that driving a mount, even as fast as ISS, require this. VisualGPS / NMEATime2 (Dale's example but good one) has a lot of math added to try to pull out all the accuracy possible from UPS GPS without PPS. It's a good windows tool to get what is likely "good enough".

It is relatively cheap however to get more accuracy: A raspberry Pi with off the shelf code and a tiny bit of soldering will let you build a very accurate time server for around $45 ($10 GPS, $35 rPi 3B). The rPi will run GPSD to process the time signals, and coordinates with PPS on a GPIO pin. Built in CHRONYC (which is NTP in disguise) will provide a time signal other systems can coordinate with. I did one recently with:

https://www.amazon.com/gp/product/B07P8YMVNT

Note that while it has USB, you have to solder to the other pins to get the PPS signal. Interestingly this device is sensitive enough a get a decent signal inside a dozen feet from a window. The rPi can power it. Add a $5 12v to 5v step down and you can power the rPi from your 12v mount supply and strap the combination to your tripod. (Try to keep the GPS device, at least the antenna, a bit away from any wifi emitters as they can conflict -- that's generally a true statement not specific to this).

Then on Windows run the Meinberg NTP server and connect to the rPi (preferably over ethernet for low delay) and it will drive the Windows clock. It is unclear exactly how accurate this combination is, but certainly sub millisecond and probably a few dozen microseconds. Add internet time servers to the Meinberg list and it will fall back to them when the rPi is not available.

Again, it's not clear that NMEA derived time is inadequate, in fact some back of the envelop math makes me think it is quite good enough. But if you are a tad obsessive about getting accurate time on windows, this is a cheap alternative, and easier than trying to "fix" windows directly to use a GPS properly.

Linwood


Re: Question: How do I safety replace the CW shaft adapter

Dale Ghent
 

You just need more leverage than what an allen wrench can provide. Use a longer device, such as a long phillips head screw driver, instead.

On May 24, 2021, at 09:42, Cheng-Yang Tan via groups.io <cytan299=yahoo.com@groups.io> wrote:

Hi guys,
I just received the new AP1100 CW shaft adapter with SS insert and I want to replace the existing one without the SS insert. I removed the CW shaft and my telescope and then in the park 3 position, I inserted an allen wrench into the holes of the adapter and applied some force. Nothing moved. I didn't want to apply more persuasion because I was afraid to damage the gears because the clutches were still engaged and so were the spring loaded gear boxes.

So before, I apply more persuasion, what is the safe way to do this without damaging anything?

Thanks for any advice.

cytan


Question: How do I safety replace the CW shaft adapter

Cheng-Yang Tan
 

Hi guys,
   I just received the new AP1100 CW shaft adapter with SS insert and I want to replace the existing one without the SS insert. I removed the CW shaft and my telescope and then in the park 3 position,  I inserted an allen wrench into the holes of the adapter and applied some force. Nothing moved. I didn't want to apply more persuasion because I was afraid to damage the gears because the clutches were still engaged and so were the spring loaded gear boxes.

   So before, I apply more persuasion, what is the safe way to do this without damaging anything?

Thanks for any advice.

cytan


Re: Ticking noise after regreasing 1100

Jeff B
 

Ok, cool.  Is it a one-per revolution click?  No laboring or other funny noises?

It may make sense to just do it over again.

Jeff


On Mon, May 24, 2021 at 4:48 AM Eric Claeys <AstroEric@...> wrote:
Jeff,
The mount is 5 years old, has spent about 30 weeks in the dusty desert, and has never been re-greased.  I seem to recall AP saying mounts should be re-greased every few years.

I used the grease kit I bought from AP.

Eric


Re: About APCC and ISS tracking and PC Time

Dale Ghent
 

On May 24, 2021, at 02:43, Bob <astro@dinoworld.com.au> wrote:

I'm really quite surprised that APCC cannot utilise gps time directly. I bought a $10 usb gps and it works well with APCC. When I went looking for the setting in APCC that would allow me to utilise the gps time instead of PC time, I couldn't find it. Now I know why.

Any idea if/when this feature will be introduced?
Time syncing is complex enough of a topic that it's best to let dedicated apps which handle the intricacies involved do the driving on this. There are entire professions and academic pursuits based around just this topic, after all, so it's just not something you snap your fingers and see appear in code no matter how "easy" it might appear to the uninitiated.

On Windows:

For NTP, there is the Dimension4. This implements a more aggressive NTP client than the standard one that's built-in to Windows.

For GPS devices that emit standard NMEA time sentences over a serial (COM) port, there is NMEATime2 ($20) or the older, free version, NMEATime.

If you are operating on Linux or other type of *NIX OS, then there are many to accommodate all sorts of time sources.


Re: About APCC and ISS tracking and PC Time

Ray Gralak
 

Hi Bob,

I'm really quite surprised that APCC cannot utilise gps time directly. I bought a $10 usb gps and it works well with
APCC. When I went looking for the setting in APCC that would allow me to utilise the gps time instead of PC time, I
couldn't find it. Now I know why.

Any idea if/when this feature will be introduced?
It probably will not be a feature of APCC because to set the time on the computer APCC would have to be run "as administrator". That is something we probably would not want to do because then the ASCOM driver would not be able to automatically start APCC.

If you have a network connection, you could use Dimension 4. Also, some inexpensive or free utilities supposedly can update the system time with some GPS devices. One I have run across is called "VisualGPS", but I don't know if it will work with the device you have.

-Ray

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Bob
Sent: Sunday, May 23, 2021 11:44 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] About APCC and ISS tracking and PC Time

On Thu, Apr 8, 2021 at 09:09 AM, W Hilmo wrote:


Your computer should be able to sync time with NIST, as long as you have an internet connection. APCC
can then update the mount’s time with the computer’s time. This doesn’t require a new feature.



The new feature that I would like to see is for APCC to have an option to update the computer time from a
GPS receiver. I do a fair amount of imaging from sites with no internet. Right now, I have a 3rd party piece of
software that I use to sync the computer clock from the GPS, but it would be nice to have an option to do this right
from APCC.



I'm really quite surprised that APCC cannot utilise gps time directly. I bought a $10 usb gps and it works well with
APCC. When I went looking for the setting in APCC that would allow me to utilise the gps time instead of PC time, I
couldn't find it. Now I know why.

Any idea if/when this feature will be introduced?


Re: Ticking noise after regreasing 1100

Eric Claeys
 

Jeff,
The mount is 5 years old, has spent about 30 weeks in the dusty desert, and has never been re-greased.  I seem to recall AP saying mounts should be re-greased every few years.

I used the grease kit I bought from AP.

Eric


Re: Should I use my BARADV for the upcoming lunar eclipse?

Nick Iversen
 

A note on tracking: a 15 second exposure is quite a long time unguided. Especially on the moon which doesn't travel at the sidereal rate. The lunar rate setting on APCC is only approximate since the lunar rate varies during the lunar cycle. And it's RA only so doesn't account for declination drift. So halving that to 8 seconds could be quite a good thing.


Re: About APCC and ISS tracking and PC Time

Bob
 

On Thu, Apr 8, 2021 at 09:09 AM, W Hilmo wrote:

Your computer should be able to sync time with NIST, as long as you have an internet connection.  APCC can then update the mount’s time with the computer’s time.  This doesn’t require a new feature.

 

The new feature that I would like to see is for APCC to have an option to update the computer time from a GPS receiver.  I do a fair amount of imaging from sites with no internet.  Right now, I have a 3rd party piece of software that I use to sync the computer clock from the GPS, but it would be nice to have an option to do this right from APCC.

 
I'm really quite surprised that APCC cannot utilise gps time directly. I bought a $10 usb gps and it works well with APCC. When I went looking for the setting in APCC that would allow me to utilise the gps time instead of PC time, I couldn't find it. Now I know why.

Any idea if/when this feature will be introduced?


Re: Should I use my BARADV for the upcoming lunar eclipse?

Nick Iversen
 

Daniel

Thanks for that explanation. It made sense until you said "aim at an f ratio (i.e., F/D) equal to 5 times the size of a pixel in microns." Can you intuitively explain why? Failing that the maths would be a good explanation.

The scope has a resolution of 1 arcsec and without a barlow that is about 1 arcsec per pixel for my camera. Your formula says I need a 3x barlow. Spreading that 1 arcsec over 3x3 pixels kind of makes sense for "smoothness."

-- Nick


Re: Ticking noise after regreasing 1100

Don Anderson
 

Eric
I would bet that there is still something stuck in one of the teeth of that gear. It could be a piece of dried grease.

On Sunday, May 23, 2021, 7:32 PM, Jeff B <mnebula946@...> wrote:

So after maintenance, you developed an issue.  Sounds to me like a problem with your maintenance.  Why did you feel you needed to re grease the mount?  What symptoms was it displaying?

On Sun, May 23, 2021 at 9:13 PM Eric Claeys <AstroEric@...> wrote:
I just re-greased my 1100 and am getting a ticking noise in RA when going west. I took off the gear cover and the noise is coming from the middle (topmost) gear, and occurs once every revolution.   I originally tightened the middle gear until there was resistance, then a tiny bit more.  If I loosen the middle gear enough, I can get the ticking to stop when going west, but then it appears when going east.  Loosening the gear also causes it to go up and down about 0.5 mm when switching directions, and the gear feels loose.

I didn't drop or bang the gear, and as far as I know, nothing fell out while greasing it.  I removed it and checked the teeth and there's nothing stuck in them and I couldn't feel any burrs.  The noise happens at 1200, 600, and 64.  It might happen at other speeds, but they're so slow I can't tell.

A picture of the gears is at https://ap-gto.groups.io/g/main/photo/264415/3232606?p=Created,,,20,2,0,0.

Any ideas?

Eric


Re: Ticking noise after regreasing 1100

Jeff B
 

So after maintenance, you developed an issue.  Sounds to me like a problem with your maintenance.  Why did you feel you needed to re grease the mount?  What symptoms was it displaying?


On Sun, May 23, 2021 at 9:13 PM Eric Claeys <AstroEric@...> wrote:
I just re-greased my 1100 and am getting a ticking noise in RA when going west. I took off the gear cover and the noise is coming from the middle (topmost) gear, and occurs once every revolution.   I originally tightened the middle gear until there was resistance, then a tiny bit more.  If I loosen the middle gear enough, I can get the ticking to stop when going west, but then it appears when going east.  Loosening the gear also causes it to go up and down about 0.5 mm when switching directions, and the gear feels loose.

I didn't drop or bang the gear, and as far as I know, nothing fell out while greasing it.  I removed it and checked the teeth and there's nothing stuck in them and I couldn't feel any burrs.  The noise happens at 1200, 600, and 64.  It might happen at other speeds, but they're so slow I can't tell.

A picture of the gears is at https://ap-gto.groups.io/g/main/photo/264415/3232606?p=Created,,,20,2,0,0.

Any ideas?

Eric


Re: A-P customer service

thefamily90 Phillips
 

Nothing wrong with calling AP and nothing wrong with seeing if anyone in our group can help.

JimP 


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Jerome Allison <jallison@...>
Sent: Sunday, May 23, 2021 5:49:11 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: [ap-gto] A-P customer service
 

[Edited Message Follows]

I thought I'd post this after reading the recent ap-ug "Mach2 vibration & noise issue from the RA axis" thread, in case it would be useful to someone else.  
 
I had a little problem the other night, having left my RAPAS on the Mach2 after polar aligning and then later proceeding to run the scope into it.  :(  (Don't forget to take it off !)
 
It didn't seem like it was damaged, but later when I had a better chance to look at it, the LED illuminator was turned at an odd angle, about 30 degrees away from the usual 90 degrees perpendicular to the optical tube.  I tried re-aligning it, but realized that this would also affect the orientation of the scope's reticle. 
 
Late Friday afternoon I emailed George, who answered in 11 minutes with this link instructing me that page 6 would show me how to check the alignment of the reticle.  
 
https://astro-physics.info/tech_support/mounts/rapas-instructions.pdf
 
Just thought I'd pass along an example of Astro Physics', and George's, perfect and very quick advice to check my RAPAS alignment.
 
Jerome
 


Ticking noise after regreasing 1100

Eric Claeys
 

I just re-greased my 1100 and am getting a ticking noise in RA when going west. I took off the gear cover and the noise is coming from the middle (topmost) gear, and occurs once every revolution.   I originally tightened the middle gear until there was resistance, then a tiny bit more.  If I loosen the middle gear enough, I can get the ticking to stop when going west, but then it appears when going east.  Loosening the gear also causes it to go up and down about 0.5 mm when switching directions, and the gear feels loose.

I didn't drop or bang the gear, and as far as I know, nothing fell out while greasing it.  I removed it and checked the teeth and there's nothing stuck in them and I couldn't feel any burrs.  The noise happens at 1200, 600, and 64.  It might happen at other speeds, but they're so slow I can't tell.

A picture of the gears is at https://ap-gto.groups.io/g/main/photo/264415/3232606?p=Created,,,20,2,0,0.

Any ideas?

Eric


A-P customer service

 
Edited

I thought I'd post this after reading the recent ap-ug "Mach2 vibration & noise issue from the RA axis" thread, in case it would be useful to someone else.  
 
I had a little problem the other night, having left my RAPAS on the Mach2 after polar aligning and then later proceeding to run the scope into it.  :(  (Don't forget to take it off !)
 
It didn't seem like it was damaged, but later when I had a better chance to look at it, the LED illuminator was turned at an odd angle, about 30 degrees away from the usual 90 degrees perpendicular to the optical tube.  I tried re-aligning it, but realized that this would also affect the orientation of the scope's reticle. 
 
Late Friday afternoon I emailed George, who answered in 11 minutes with this link instructing me that page 6 would show me how to check the alignment of the reticle.  
 
https://astro-physics.info/tech_support/mounts/rapas-instructions.pdf
 
Just thought I'd pass along an example of Astro Physics', and George's, perfect and very quick advice to check my RAPAS alignment.
 
Jerome
 


Re: Question re: Initial setup with GTOCP4

Worsel
 

Jill

My mount control setup is essentially the same.

Mini-PC in observatory <--> Router<--> Ethernet port on 1100
Network <--> Router
Remote access PC (TightVNC) <------> Router

You can use your router software to find the IP address assigned to the 1100 or the AP GTOCP4 software. https://www.astro-physics.com/software-updates/


Bryan


Astro-Physic's new cable length for the Mach2

Harley Davidson
 

A short video on AP's new 22" cable for the Mach2 mount.

tony

https://www.youtube.com/watch?v=aRANsIp4Eug


Re: Should I use my BARADV for the upcoming lunar eclipse?

DFisch
 

Daniel, a true work of art and I am so glad your retirement coincided with a great astronomical time.   I had seen this image before and did not link the author to your signature here.  Exceedingly well done and creative, glad you got an award for that one.  Tom

On May 23, 2021, at 10:07, Daniel Borcard <daniel.borcard@...> wrote:

That's a very nice image. You must live near or on the Mediterranean coast of France.

Rolando


Thanks Rolando,

No, I live about 40 km straight north of Montreal :-)
If you follow the link to my Clear Sky Chart (in my signature block) and click on the light pollution map you'll get an idea:

Last fall I spent many nights out to image Mars. I actually managed to image its whole surface over the months, make a map and project the map onto a globe. See:

Daniel

--------------------------------------------------------------------
Daniel Borcard
Observatoire du Geai Bleu
Le ciel est assez grand pour que chacun y trouve sa place.
--------------------------------------------------------------------








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