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Everything posted by NickK

  1. NickK

    SGLXII Chit Chat

    Forget fan heater - a Oil electric radiator is where it's at! Get one that can switch between 800W, 1600W and 2400W. Keep in the inner lined area (i.e. bed area) and the heat remains in there rather than getting people annoyed with heat plumes as you can sit there with just at 800W and the timer can be set so it stays off then when you're expecting to go to bed you can pre-empt your arrival Also a IR heater works but careful as most have a minimum distance without causing burns to bare legs when in the confines of the tent. Remember an air mattress will still be cold.. so put some metallic loft/wall insulation between your sleeping bag and the mattress to reflect your heat back..
  2. Any update on the height of the trees? Each year they've been growing.. #bbqfirewood
  3. NickK

    SGLXII Chit Chat

    This year I'll be looking to record all my guider images for deconvolution too.. also I'll be using embedded linux (i.e. INDI) for the first time this year..
  4. 16A + RCD to 3x 13A house sockets with a very long lead: http://www.gooutdoors.co.uk/streetwize-mobile-mains-unit-p396437 Used my since SGL6 ..
  5. Agreed - looking forward to it! (also in Guildford!)
  6. Sounds to me like they want to assess the pitches before offering them. Everyone normally sets up their equipment before dark anyway.. so you can see who are imagers and who are visual. Most people help with tents which is good as it means more time to setup equipment - it's a good idea to get a loo tent that closes. These are great as they keep the water off and once aligned/setup they keep things neat and tidy.
  7. NickK

    SGLXII Chit Chat

    started the detox already... I still have a massive amount of beer left over from earlier BBQs and over generous french inlaws
  8. Well I should be bringing my scope now it's been fully automated :D... a set of eyepieces and a pair of binos
  9. My first .. SGL6 I had the kit for 2 weeks before! It's actually the best way to learn - ask & experience.
  10. So.. purchased a replacement soldering iron and should be able to complete the remaining last few bits ahead of the SGL star party.
  11. Only issue with inverters are some laptops don't like the cheaper modified sine waves versions. Apple's laptop power brick makes some nasty noises and the final word on that was to use the pure sine wave output inverters.
  12. That depends on the manufacturer - they will need to re-release the software using the updated tools (including the cost of additional development).
  13. Yup, from a developer point of view, the rapid churn out of OS versions is a pain as apple's own development tools only support the last two major versions. Hence you're forced todo the same unless you start using the older SDKs for the older macs.. then the code doesn't often work for the future versions.. damned if you do; damned if you don't.
  14. Finally got around to bolting he boxes down to the bracket. Just have some USB cables and some power cable changes and everything is done. Should get myself a new soldering iron after the other one became a death trap!
  15. C2 with both Ekos and INDI on the same embedded board running bleeding edge. INDI is the driver and control process, not the display/analysis/guiding of images. Ekos does the capture and control, this seems fine - however likewise the FITS viewing is slow. An example of file system slowness can be seen when using astrometry.net. With annotated images the process takes minutes, however without annotation and just the RA/DEC results etc the process takes 14s with the entire 32GB set of indices in use. Astrometry is a separate project to INDI and Ekos - so the only shared component open source libraries are cfitsio and a few others along with the operating system. I have pointed out the efficiency aspect of INDI handling large images before (i.e. the architecture makes it inefficient) however this would point to the fact that it's more the FITS handling and the underlying OS filing system performance.
  16. Yup longer focal length image for me too - being a detail bod
  17. I missed it the first time around.... there's an interesting point about the use of harmonics and the length of the coils to improve efficiency at lower speed.
  18. Hmm seems my previous post disappeared in the mobile either.. Looking at the planewave design and the MIT paper, there are a couple of points: 1. In the MIT paper it indicates the spacing between flux for the magnets and coils (iron), this shows the reason for using more magnets than coils - the thinner magnets means less flat spots in the waveform that result in dead spots and so more efficient. 2. Magnets and coils shaped as wedges result in better performance due to the flux resulting. It should be possible to use two sets of coils - one set of one side and one set on the other side of the magnets. The result is that you should get higher granularity. the key here is to have the magnets not backed by iron/metal but in slots instead. In fact having the magnets side on may produce a weaker field but more oscillations between North and South poles. However with more coils, the net effect is the same (although the more copper.. and less power results perhaps in less efficiency).
  19. It's one of those things.. each time you use the scope it reminds you of the fact! Should have a bit of time for some drilling and bolting to finish it this weekend.. but it's still down the long list of priorities!
  20. Got down to the bottom of the focuser issue - some intermittent wiring.. it even works at 1/32 now. Video of the focusing using the INDI/C2/YARF: So to quote the Emperor... it is a fully functioning Death Star.. as all the bits work now - capture, focusing, plate resolving, mount control, external wifi desktop access. Todo, once I have a new soldering iron: * secure mountings of boxes and limit switches with bolts rather than hot glue (this works really well to find any issues of position before drilling holes) * limit switch calibration upgrade to the focuser providing an absolute focusing system that can cope with the resolution ( log10(1600000)/log(2) = 21 bits required, i.e. 24bit 0xffffff) instead of the 65K 16bit resolution at the moment. * replace the USB cables with shorter cables * fit the SSD inside the main box... * fit external mount power connector * make a stowage box so that the scope can be kept assembled.
  21. Running at Full stepping with 1000step setting in INDI. I will have to adjust the INDI driver as it has a maximum of 65,535 steps at a time before you have to reset the counting.. With 1/32 stepping .. for each focuser rotation it would need 200*32*100 = 640,000 steps and there's something like 2.5 turns of the focuser for the ~80mm travel of the focuser (1.6M steps)..
  22. Here's the arduino current sources - if you use then you accept all the risks and agree I can't be held responsible for any damage resulting from it's use. Current Arduino sources.zip On the indi side - just use the standard Moonlite driver. The ":X" series of commands are debug commands I use on the arduino interface. ":XX#" gives a status report for example - the rest are fairly easy to understand from the source. To change the speed - at the moment simply change the speed setting (M0,1,2) in the DRV8825 driver constructor. The DRV will need to jump steps when changing micro stepping, so at the moment I've not made that a parameter system also for now the speed is also disabled (this just varies the rate of steps at the current micro stepping).
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