Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

stargazine_ep28_banner.thumb.jpg.b94278254f44dd38f3f7ee896fe45525.jpg

Sign in to follow this  
Davide Simonetti

Guiding Query For EQ5 Mount

Recommended Posts

Hello, I hope I'm posting this in the right section. I have a guiding query I hope people here may be able to help me with. I have just purchased a Skywatcher EQ5 mount (without GoTo) and also the Skywatcher Enhanced Dual Axis Handset For EQ5 in order to be able to guide (this has yet to arrive so I haven't been able to look at it closely). I was wondering if anyone here has worked with this setup and particularly if there is anything else I need to get in order to make it work.

From what I can tell the Skywatcher Enhanced Dual Axis Handset comes with the two motors and has an ST-4 interface for an Auto-Guider. So far so good, but I can't see how it communicates with the laptop to make guiding corrections dictated by the software (I use PHD for guiding). My guiding camera is the ZWO ASI120C and the guidescope is the Orion 50mm mini guidescope. There must surely be a cable that goes from the USB port to the handset but I can't see any mention of one, or indeed if something like that is required. Looking at other setups and examining the PHD settings, I've seen mention of something called a GPUSB guide port interface adapter which plugs directly into a USB port on the computer. Using an RJ-12 cable, the adapter connects to the guide port of the telescope mount (or in this case the Enhanced Dual Axis Handset hopefully). I'm assuming I'll need something like this.

On my old setup a cable goes from the USB port of my laptop and is converted to a plug that goes into the bottom of the Celestron handset and is controlled wth the ASCOM Celestron Telescope driver, while the guide camera (ZWO ASI120C) connects to the mount. While I can see how the guide camera connects to the Enhanced Dual Axis Handset on what will be the new setup, I can't see any USB cable or converter that goes into the new handset, nor can I see any mention of the need for one, which strikes me as odd. 

Looking at the PHD settings and also at other setups online, I saw mention of something called a GPUSB guide port interface adapter which plugs directly into a USB port on the computer. Using an RJ-12 cable, the adapter connects to the guide port of the telescope mount (or in this case the Enhanced Dual Axis Handset...hopefully). I'm assuming I must need something like this and that the Enhanced Dual Axis Handset accepts one (or an ASCOM equivalent - I didn't see Skywatcher listed in the PHD driver options). 

I hope this makes some sort of sense. Any advice would be greatly appreciated. Thanks :icon_biggrin:

Share this post


Link to post
Share on other sites

The camera is connected to the laptop through a usb cable. The camera then sends a video feed to PHD. PDH then sends the corrective commands back to the camera which in turn sends the signal to the handset through the ST4 ports.  The two cable connections are :- camera to laptop (USB)  and camera guide port to handset guide port (ST4) . In PHD you select "on camera" for the mount type and ASI for the camera type.

http://openphdguiding.org/manual/?section=Basic_use.htm#Equipment_Connection

 

  • Like 2

Share this post


Link to post
Share on other sites
44 minutes ago, Cornelius Varley said:

The camera is connected to the laptop through a usb cable. The camera then sends a video feed to PHD. PDH then sends the corrective commands back to the camera which in turn sends the signal to the handset through the ST4 ports.  The two cable connections are :- camera to laptop (USB)  and camera guide port to handset guide port (ST4) . In PHD you select "on camera" for the mount type and ASI for the camera type.

http://openphdguiding.org/manual/?section=Basic_use.htm#Equipment_Connection

 

Ah, thanks for that Peter. I was getting really confused. I thought PHD sent corrective commands to the handset via another USB and not back to the camera. Phew! I can't wait for this gadget to arrive now...and of course some decent weather. Thanks also for the PHD settings...very helpful :icon_biggrin:

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By Brownthunder93
      Anyone have any idea where I can get a replacement counterweight bar/shaft for my EQ5 mount? 
    • By pete_81
      Hi guys,
      With new mount and upgraded scope features, now looking to venture into imaging.
      Before I start, I'm not looking to get feedback on polar alignment, mono guidecam, better imaging cameras, etc; this is more a 'dummies guide' setup discussion! I'm not expecting to get great images at this stage, just more the options available, getting over some issues, so that I can jump outside on a clear night with an ideal, foolproof(!), setup for either imaging or visual as time would permit and what may work best for me. As you may guess from the topic name, I'm a mac user (Macbook Pro) and would rather keep to this if possible (whilst I do have Windows (and Ubuntu) via parallels, I'd rather not use these).
      I've got a setup which has worked well for visual, and obviously want to have a couple of 'staple' setups that I can use depending on expectations of night observing or imaging. So far, the best one for me has been the Skywatcher Wifi Synscan controller, which has worked a treat with my Android phone - I use the Synscan app to complete alignment and GOTO stars/planets/DSO etc, or Stellarium_plus after completing alignment. This removes the need for the Synscan Handset and any USB cables to the mount altogether. But I don't know if this will work for guiding.
      That then brings me to my issue on mac - connecting USB(A) between Macbook and Handset, I've attempted to control the mount through Stellarium. Trying each of the available connections (/dev/tty.usbsetial-1420, /dev/cu.usbsetial-1420, and just for sake of it, the /dev/tty.Bluetooth-Incoming-Port and /dev/cu.Bluetooth-Incoming-Port) in the dropdown menu under DeviceSettings/SerialPort, I cannot get the mount to connect (well, more like selecting the telescope and clicking the "Start" on the TelescopeControl just results in the spinning icon and I have to Force-Quit Stellarium and start again with the same result each time. Annoyingly (for fellow mac users!), Parallels/Windows/Stellarium connects and controls the mount fine! As the mount is the newer "pro" type, I also have a USB connection directly under the hand-controller RJ45 and AutoGuider ST4 sockets, but using this still results in the same issue. Another issue I have seen is that when I unplug the USB from the computer when connected to the handset, the date on the controller jumps significantly - for example, last night at ~23:30, I was transported through the local wormhole galaxy to Jan 2048 according to Synscan! Obviously unplugging isn't going to happen during a genuine session, but just wondering if this is a possible issue somewhere?!
      Any other mac users connecting USB directly to the SW 'Pro' mounts?
      Software wise, would folks generally suggest steering away from Stellarium towards KStars or SkySafari(Plus) for controlling the mount?
      Can the Wifi dongle be used for controlling mount from computer (any OS) or do I need to go USB either to handset or directly to mount?
      Is there an issue in using Mac USB to the telescope compared to 'straight' Windows (i.e. PC/laptop with Windows instead of virtual)?
      Anyway, back to topic... I've a Nikon DSLR to use for primary camera at this stage, which would be triggered independently from guiding software. PHD2 is my hopeful choice of guiding software (is EKOS with KStars similar?), with T7C guide-camera on 240mm f/4 guidescope, and at this stage, I can confirm PHD2 at least connects to the camera on OS-X. There is an ST4 port on the camera, but having read several topics, I think I want to pulse-guide directly - is this correct or is ST4 best for this setup? This sorta comes back to software and connections - my understanding is one of the following cable setups for guiding (as a minimum) :
      Guiding-camera => USB(A) => Macbook => PHD2 => USB(A) => SynscanHandset => AZEQ6
      Guiding-camera => USB(A) => Macbook => PHD2 => USB(A) => AZEQ6
      Guiding-camera => USB(A) => Macbook => PHD2 => Wifi => SynscaWifi Adapter on AZEQ6
      [using ST4: ST4_on_AZEQ6 => Guiding-camera => USB(A) => Macbook => PHD2] (no additional connections needed if ST4 is used)
      Additionally, I'd like to use an observatory package, say Stellarium/KStars/SkySafari, to select objects and drive the mount, then use guiding software to keep good 'tracking'.
      Where in this train does EQMac fit in, or when is it used?
      What about the 2019 addition to EQMod (ASCOM Alpaca)? Can this be used or is it already in other packages?!
      For Windows users, how does EQMod fit in (if I go down route of getting Windows laptop for controlling things, is the setup similar to above?
      There may be bits in the above that repeat, and for that, I'm sorry, just want to get across the message that I'm new to the guiding but haven't quite settled down into the software/hardware I'm expecting to use for 'goto' and 'guiding'
      TLDR:
      For a mac user, what setup and software are folks using for guiding and observatory softwares for the newer USB-on-mount 'AZEQ6/EQ6-R Pro' mounts from SW?
    • By Astrid
      My 200P just arrived and oh my God... I have been trying to wrap my head around the mount for 4 hours.
      The manual didn't really help so I decided to go on youtube, but again, I didn't find any good and detailed videos so I decided to ask here if there is any video or perhaps blog post that might help me set up the mount. 
      Thank you very much! 
      *by the way, is the EQ5 supposed to have slow motion cables? I only got 2 knobs (not cables) and I'm not sure if there is something missing or not... sorry, this is the first time I've used a serious equatorial mount or telescope. 
      Thank you very much!
    • By astrosathya
      Recently I had belt modded my HEQ5-PRO and last night i gave it a full run and i was absolutely stunned to say the least about the guiding results I achieved. I was left wondering if its even too good to be true! 
      Below are Before and After images of guiding.


    • By SteveBz
      Hi People,
      I have quite severe backlash, such that guiding assistant just gives up.  It seems to be about 11 secs in total, the one time GA came back with anything, but it's about 3-4 secs if I measure it by hand.  Here's some guiding.  Actually, it's worse when I'm dithering.

      So, I tried measuring the backlash with by counting and it's about 3-4 secs.  If I used PHD2 guiding assistant, mostly it fails, or it comes back with a very big number, like 11,350 msecs.
      I tried entering this:

      But then I got a see-saw mechanism, even when I dropped 8,000 to 3,000 it was the same.
      I've taken the motor off just now and looked at the grub/hex-screw mechanisms.  One hex-screw was loose, so I tightened it to hand tight and let the grub-screw off an eighth of a turn.  I'll look again this evening.
      I ran a three hour sequence of exposures on NGC6888 (with dither) and this is what I got on EVERY image.  Amazingly, they stacked nicely.

      So last night I ran without dither and it was mostly OK.  What I want is full dither, but to do that I need to deal with the backlash.
      Here's a photo of the motor and gears, most of the backlash seems to come from the top gear (ie the 12-tooth gear and its neighbour).  I guess the rest comes from the worm-gear:

      Does anyone have any suggestions? There doesn't seem to be a belt-mod for the EQ5 as far as I can see.  Maybe there are better Dec backlash compensation settings I could use.
      Thanks,
      Steve.
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.