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NEM

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Everything posted by NEM

  1. I'd be interested to see your weatherproof interface for the scope connections. I'm planning to build something similar in the next few months. Noel
  2. I see from the circuit shown in the link Malcolm gave that the RA motor is connected to pins 6 and 7 of the coiled cable. If you swap the cable ends those lines will be used for the Aux connections which are never used, so the mount may work properly. Noel
  3. Try swapping the cable that runs between the handbox and the mount end over end. The LXD 75 cable isn't straight through, it's reversed That is, pin 1 goes to pin 8, 2 to 7 and so on. If you change the ends over the signals change over as well. If the failure message changes then it points to a fault in the cable or the connectors. I can't remember where I read this, but it's an easy check to make. Noel
  4. I've got one of those and though I've never used it for this type of job, it's got enough power to melt soft solder. You might want to get a pair of these as well; though check them out before using them. The first pair I got had a small hole right on the tip of the index finger, just on the point where you might poke something to see if it was hot! Noel
  5. I'm fairly new to FreeCad, but I can't believe I've not found that website. There's plenty of useful info to read there. Thanks a lot.
  6. That's very impressive. Can you recommend a tutorial on threads in FreeCad? Noel
  7. I have an SPC900NC working correctly on Win10. Search the Philips web site for SPC900NC_00_SW7_ENG.exe.
  8. If you use all three bolts for primary collimation, there's a danger that you'll repeatedly turn them all the same direction and eventually 'walk' the mirror off the bolts. I'm not sure if that applies to the secondary as well. Noel
  9. I think it's to do with slower scopes (higher f numbers) having a less divergent light cone, so the focal plane can move more before blurring becomes noticable. Here's another website http://starizona.com/acb/ccd/advtheoryfoc.aspx giving the same type of analysis.
  10. If I'm reading the info on this http://www.astropix.com/HTML/I_ASTROP/FOCUS/DEFS.HTM page correctly, I think the depth of focus changes as the square of the F number. So an f10 scope is more forgiving than an f4.8. Noel
  11. You reminded me that I still have to make my own focuser DLL self register, so I did a bit of searching. Here's a link https://www.simple-talk.com/dotnet/visual-studio/build-and-deploy-a-.net-com-assembly/ to an article on this. Noel
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