Jump to content


Beta Tester
  • Posts

  • Joined

  • Last visited

Profile Information

  • Gender
  • Location
    Melbourne, Australia

Recent Profile Visitors

603 profile views

MarkS's Achievements


Member (1/1)

  1. The DDM 85 basic is set up similarly to the DDM 60. That may be some help. Mark DDM60_ProductManual_E.pdf
  2. Not sure if this is relevant in your case, but it is important that the permissions for reading/writing are allowed for Autoslew and Sequence Programs and Program Data. These are found in Windows>Program Files (x86)>Autoslew>Properties>Security; same for Sequence and same for Windows>Program Data>ASA>..... When I first changed from Windows 7 to 10 I had to set some of these permissions to 'Allow'. Mark
  3. I agree with Robert...Could you describe the problems you are having? Mark
  4. Hi Stephen, I am not quite sure what you are asking, but if you are trying to make and use a pointing file or get a polar alignment, instructions are in the Autoslew guides which you can download from the ASA drive. Sequence is a convenient way to make and save a PointingError.pox file; then you solve it and save it with Autoslew. Hope this helps. Mark
  5. This may or may not be much help, but I have been using a DDM60 in mobile systems for some years, and I evolved by trial and error a start up procedure which guarantees a clean start up. I transferred the procedure to my DDM85A rollabout system and it also works every time. An important feature is that once everything is connected together, the mount power is turned on BEFORE the computer power is turned on. This always seemed to guarantee clean a start up, whereas failure to do this could cause problems....... I never found out why, and I just did what worked. Mark
  6. Hi Stephan, I don't have a TCF-s focuser, but I use a FLI Atlas with Sequence. You need to find by experiment how Sequence interprets the number of steps in mm. With the Atlas, I found that Sequence 'thinks' 1000 steps is 1mm. In fact 1000 steps of the Atlas is 0.083mm. I then had to enter appropriate Coarse and fine AF steps in Sequence settings. These were 24mm and 12mm respectively. The actual movements of focus are 2mm and 1mm. These amounts gave good AF results. Also, because the Atlas is so slow, I had to increase the focuser time-out to 100sec to prevent overflow error messages. I also increased the Maximum Way from Startpoint to 10mm. (ie actual 0.83mm). You will need to find the right numbers for your focuser - but I hope this helps as a guide. Mark
  7. With a heavy load, balance is very critical on both axes, particularly RA. The total load (OTA plus camera etc) should not exceed 28 kg for the DDM60. Overloading these mounts must be avoided!!! Read the recent discussion on balancing - I think it's the 'DDM85 position crash'. It is definitely a case of near enough is NOT good enough! Balance is critical. Tuning the motor parameters is well covered in the manuals. Always worth a read, even if one knows what one is doing, but I suggest you don't try to push the PID numbers too hard - the system will tell you that you have gone too far by going into oscillation. I'm not sure, but I suspect that very high PID settings may exacerbate motor current increases over time. Relaxation slews at intervals during a run is good practice. I'm not sure what you mean when you say that the problem mostly occurs close to the horizon. Why would you image there? If you try to send the mount too close the lowest altitude limit, it will get into trouble. In any case, for good imaging it is best to limit altitude to above 40 degrees or so. I set the limit in Autoslew to 25 degrees, but never image below 40 degrees. Hope this helps. Mark
  8. Recently I had to go through commissioning a new laptop. I thought I knew what I was doing as I had been using two ASA systems for years. It turned out that I had forgotten about some critical but simple steps, and after the mount heading off for the wrong hemisphere and refusing do what it was told, I gave up and called Wolfgang at ASA for a Teamviewer session. He sorted it in about 2 minutes - much to my shame! The basic problem was, that in spite of having all the software and program data properly installed, it is critical that you 'Set new Homeposition' after having done the Homefind and then pointing the scope at the zenith or some star. This may or may not be your problem, but the erratic behaviour points something of this sort. Others may have better ideas, but in any case it won't hurt go through the manual and check that the fundamental first set-up steps have been followed. Only then should you start looking for subtlties🙂 Mark
  9. Try setting park1 as your horizontal OTA position, and set Park2 to the zenith Mark
  10. You could leave Park1 at the zenith, as it is useful for testing, and use Park2 as your parking position. Mark
  11. PS: Read the thread on DDM85 position error crashes. Cheers, Mark
  12. What load is the mount carrying? These currents look high to me on both axes. My DDM 85A carries an OTA and camera with a total weight of about 28kg - which is a relatively light load. Current on the DE axis is usually below 0.3A, and on the RA axis usually below 1.2A. The currents are dependent on load, however I do not know what the current vs. load curve is. Mark
  13. I have an ASA 0.73 Reducer, and its dimensions are exactly as per the ASA drawing. Are you sure what you have is an ASA reducer? Mark
  14. Robert, I definitely get best long term performance if I finalise RA balance by running the system for an hour or so on each side of the meridian, and adjusting counterweights until I get the most equal current draw over time on each side. I find that in the Southern Hemisphere the optimum current occurs when the counterweight slightly favours the East side. See my above post also. Mark
  • Create New...