Posts Tagged ‘supatrack’

Problem with my SupaTrak Alt-Azimuth Mount

Monday, February 22nd, 2010

On Saturday (20th Feb, 2010) I was eagerly looking forward to taking a few more photos of Orion, but I had a nasty surprise when my SupaTrak Alt Azimuth mount refused to play ball.

When I switched on the handset/motorized mount, the Set and Go Cruise buttons starting flashing, and they wouldn’t stop. This rendered the the motorized mount useless as it refused to do anything.

Having put a post on a forum, it looks as though there might be a communication problem between the handset and the mount.

I bought my telescope (a Sky-Watcher Explorer 130P) just under a year ago, so it should still be under warranty if I need to return it. I hope it doesn’t come to that as I don’t want the hassle.

So, it looks as though for the time being I’ll have to revert to my 50mm reflector telescope … oh hum …

Update – 23 February

I put another post on a different forum, again asking the same question and, yes, it looks as though it is a communications problem between the handset and the alt-azimuth SupaTrak mount.

This morning I received an email from Telescope Planet asking me to return the handset. Hopefully, it is that rather than the mount, which would cost a lot more to send through the post.

Update – 04 March

Well, I’m still without a handset, so in effect I’m still without a telescope ! We’ve had some really clear nights recently as well, so it’s all a bit frustrating …

Update – 08 March

Still no word from Telescope Planet … and we’ve had some really clear skies just recently.

Update – 13 March

Today I received a new handset from Telescope Planet … but the problem still exists. I’ve sent another emal to Telescope Planet asking them what to do next. It’s looking as though the mount will need to be replaced.

Update – 18 March

I’m still without a working telescope. I feel frustrated at the moment because, although they are always very polite, I always feel that there is a lack of information from Telescope Planet as to what they are doing to resolve my problem.

I’m also aware that the nights are becoming lighter and I’m losing valuable astronomy sessions while my telescope is broken. I’ve also started looking at alternative telescopes – just in case I end up having to buy a new one. I need this situation with my broken scope to be resolved by the end of the month (March 10).

Update – 23 March

I’ve received an email from Telescope Planet asking me to package up the mount and handset so that they can be sent to the manufacturer for testing/repair. It feels a bit like pulling teeth, but I guess we’ll get there in the end.

Update – 30 March

Today I posted the mount, power supply pack and handset off to Optical Vision (the suppliers to Telescope Planet) so that the unit can be tested and, hopefully, fixed. I guess I just have to wait now.

Update – 08 April

I contacted Optical Vision today to see if they had made any progress with my ‘mount’ problem, but it was still waiting for a technician to test it. They rang me back later though to say that they had tested the mount and it was OK. They spoke to my wife so I’m not sure what was said exactly, but they’re returning everything to me – with another new handset (see 13th March entry above – I’ve been here before).

Anyway, everything should be with me by Monday (it’s Thursday today), so we’ll see.

Update – 16 April

Success – yesterday I received my mount, handset, and battery pack back from Optical Vision, and everything now works OK. The handset has been replaced so that must have been the problem (the replacement handset that Telescope Planet sent me a while ago must have been faulty).

So, in conclusion, a successful outcome even though it has taken eight weeks to resolve the problem. Everyone I have dealt with at Telescope Planet and Optical Vision has been very polite and helpful, although I have been frustrated sometimes by the slow progress.

Adding some GOTO functionality to a SkyWatcher Explorer 130P telescope

Monday, October 5th, 2009

One of the drawbacks I find with my SkyWatcher Explorer 130P telescope is that, as a novice astronomer, I sometimes fail to find a particular object in the sky. For example, I recently failed to find Uranus (twice) – I knew roughly where it was in the sky, but I just couldn’t see it.

In many ways, that’s all part of the fun, and was my main reason for not buying a GOTO telescope – I wanted to learn how to find objects in the sky without simply relying on a bit of software to find them for me !

However, sometimes I do feel that I could do with a bit of help.

Red Dot Finder

The SkyWatcher Explorer 130P telescope I own is equipped with a red dot finder which, although useful to have, is only of any real benefit for me when I can see (with the naked eye) the object I want to view through the telescope, or something fairly close to it.

Basically, you need to be able to see the object on which you want to place the ‘red dot’;  if you can’t, you have to guess where it is.

It was after my failed attempts to find Uranus that I thought to myself that I must do something to reduce the ‘guessing’ element.

SupaTrak Heavy-Duty Motorised Multi-Speed Auto-Tracking Alt-Azimuth Mount

The SupaTrak motorised auto-tracking mount lets you track an object once you have found it. This, in my opinion, is essential if you want to study an object for a few minutes without needing to continually adjust the scope’s position. But again, this only comes into its own once you have found the object.

Stellarium Software

An essential tool for me as a novice astronomer is Stellarium software, which provides a real time view of the sky. Unless I am going to observe an object I am familiar with, I always have a quick look at the Stellarium software to get my bearings and to identify where objects are in the sky, or where they will be in a few hours’ time (for example).

One of the features of the software is that you can display an alt-azimuth grid on the screen, as shown in the (very rough) sketch given below.

Stellarium grid showing positions of various objects

 

 

 

 

 

 

 

 

The important thing here is that the grid shows the horizontal (left to right) and vertical (up and down) position of an object (not a very technical description I know, but hopefully you’ll understand what I mean).

Now this is interesting because the SupaTrak Alt-Azimuth mount also has a vertical scale.  This means that if I set the position of the mount so that it matches the vertical value from the Stellarium grid, the telescope should be correctly set, vertically, for the object I’m trying to view – the telescope should be set to the correct height.

The only question now is how to set the horizontal value, in other words, how to rotate the telescope around so it is pointing in the right direction for the object.

Creating a Horizontal Scale for the SupaTrak Alt-Azimuth Mount

It seems strange to me that the SupaTrak mount doesn’t have a 360 degree horizontal scale to aid with the positioning of the telescope, so, I decided to add one myself. If you look at the photo below, I have indicated where I have added the scale (the scale isn’t actually shown on this photo – just its position is).

SupaTrak Alt-Azimuth Mount

I created the scale by initially wrapping a piece of string around the mount, in the position where I wanted to put the scale. This enabled me to establish how long the scale needed to be. I then drew the scale on a piece of paper, going from 0 to 360. In fact, I drew the scale in four sections to make it easier to manually handle: 0-90, 90-180, 180-270, and 270-360.

I also put a small mark (line) on the top of one of the tripod legs. This mark has to line up with the telescope when the telescope is pointing North, and must line up with zero on the scale (see photo below).

Finally, I cut out the scale and stuck it in position on the mount  (see photo below).

Using the Scale

To use the scale:

  1. Switch on the telescope and point it in the direction of North, making sure that both the vertical scale (the one that is built into the scope) and the horizontal scale (the one drawn on paper) are both set to zero. So, the scope should be horizontal, pointing North, with both scales set to zero. The mark on the top of the tripod must line up with zero on the horizontal scale.
  2. Turn the telescope off and then back on.
  3. Use the control unit to position the telescope so that it matches the coordinates taken from the Stellarium software.

Tolerance

To maximize the chances of the object appearing in the field of view, you should use a very low magnification eyepiece. If you have a 40mm eyepiece, use that.

Obviously, if the telescope’s starting position is slightly out, for example, if it’s not completely horizontal or it’s not pointing to North, that will have an impact on how successful you are.

SupaTrak Alt-Azimuth Mount - with scale

 

 

 

 

 

 

 

 

 

And here (below)is a close up of the hrozontal scale, showing how zero and 360 degrees need to line up with the line (mark) on the tripod. This is the position that the scale needs to be in when the telescope is switched on.

SupaTrak Alt-Azimuth Mount - with scale - clos up

 

 

 

 

 

 

 

 

 

Obviously, none of this will turn your telescope into a fully blown goto scope, but it may help you to get the scope within a few degrees of the object you’re trying to find.

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