Handbook for SXV-M9 Issue 1 June 2004
22
1. Set ‘RA Pixels per sec’ and ‘Dec Pixels per sec’ to 5.
2. Set all backlash and hysteresis values to 0.
3. Set ‘Ignore drift < 1 pixel’ to OFF.
4. Set ‘70mS delay between direction changes’ to ON.
5. Set ‘Default guide training time’ to 2 secs.
These values can be refined later, but should work reasonably well with most
telescopes.
You can now test communications between the computer and telescope mount, as
follows:
1. Press ‘Set slew values’, followed by ‘Save Program Defaults’.
2. Select ‘Telescope control’ in the ‘File’ menu.
3. Press each button in turn and observe the LED lamp at the rear of the camera.
As each is pressed, the lamp will brighten and change colour between red and
green. The telescope will also begin to slew in the appropriate direction. This
slew will be slow (unless you have deliberately selected a fast slew mode via
the telescope controls) and so you will need to observe it through the telescope
eyepiece, by watching stars drift by. If the LX200 output is in use, the LED
will not respond, but the ‘scope will still slew correctly.
If all is well, you can proceed to testing the guiding system itself, otherwise, check
your setup and confirm that the correct COM port etc. is selected.
Refit the CCD camera to the telescope and rotate it so that the mounting bracket is
aligned approximately East-West. Focus in the usual way on a star and then point the
‘scope towards the object you have selected for imaging. I recommend something
near the celestial equator and with a reasonable number of useful guide stars around
it, to make life a little easier!
Take an image of the field, using an exposure time of 1 second and selecting ‘Auto
contrast stretch’ in the ‘View’ menu. Several stars should be easily visible in the
displayed image, but, if not, try increasing the exposure time a little. Remember that
the ideal guide star is one that is bright enough to be easily detected in a 1 second
exposure, or less.
Once you have the test image and can see an appropriate guide star, go to the ‘File’
menu and click on ‘Select guide star’. Now click the mouse on the image, with the
pointer on your selected star. The pointer will jump onto the star and a message box
will show its co-ordinates in a message window – press ‘OK’ to confirm the selection.
You have now selected the guide object and are ready to start an exposure.
Call up the camera control panel and select a 1 second (or the length necessary for
your guide star) exposure time. Click on the check box ‘Self guide next exposure’ and
‘1 second’ should appear in the self guide exposure box. Now set the exposure for the
image (try 5 minutes as a good starting point) and click on ‘Take picture’.
(35 pages)
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