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Everything posted by jambouk

  1. Mount them at the same time, or at different times? Do either of these help? https://www.rothervalleyoptics.co.uk/baader-universal-quick-release-finderscope-base.html https://www.rothervalleyoptics.co.uk/rother-valley-optics-triple-finderscope-mounting-bracket.html
  2. I’ve never seen or used one of these, but on conventional polar scopes one can screw the “eyepiece” part of the polar scope to improve focus - it’s a balance of the star being in focus as well as the etched reticle being in focus, and for my dodgy eyes neither are perfectly in focus. See if there is something to screw where you look through; use a distant horizon object in the day time to see if it has any effect. James
  3. The precise time/date/altitude/latitude and longitude are just not necessary for a set up which is not permanently mounted AND parked. I wouldn’t bother spending hours trying to get the GPS thing working, rough and ready numbers will be fine (ideally within 10 degrees of your actual location north-south and east-west).
  4. Handset polar alignment routine: https://stargazerslounge.com/applications/core/interface/file/attachment.php?id=395030
  5. The location, time/date, altitude, three star alignment etc has nothing to do with your tracking accuracy. The tracking accuracy is mostly an index of how good your poor alignment is and how good your kit has been engineered. There isn’t much you can do about the latter, but you can take steps to work out how to improve your poor alignment. You have a synscan, so if your handset / firmware allow, there is a handset poor alignment routine you could undertake, I’ll post a link to it. What is the focal length of your telescope and imaging system? If more than 1000mm or so, then you may find even with perfect poor alignment you still get trailing stars at 20-30 seconds. James
  6. Is there a Utility function in the menu tree? If there is, is there an Information option within that? Is there is, is there a Version option? If so, the firmware versions for the handset, and the database etc may be listed. If so, can you post what it says for all options? James
  7. What version is the handset firmware?
  8. Here is the update page: http://www.skywatcher.com/download/software/
  9. Does your version of the firmware allow you to alter the way it offers alignment stars? For sometime you can make it list potential alignment stars by brightness, so the brighter, better well known stars appear first.
  10. There is no shortcut that I’m aware of with the Skywatcher handset. James
  11. Nice. It's fascinating to put a bit more flesh on the bones of names we've heard, but never really given much thought about. His obituary by the RAS can be found on the link below, and he is mentioned several times in a BAA article, which also includes a photograph of him: http://articles.adsabs.harvard.edu/full/seri/QJRAS/0003//0000048.000.html http://www.britastro.org/iandi/instruments-origin.htm James
  12. Robert Garfinkle's long awaited book on the Moon has now been published. It consists of three volumes, each hardback and collectively they weigh about 5kg - it is a significant tome. It looks like it is a print on demand book, and my copies took about 18 days to arrive from ordering. I ordered through the Springer website, and the collective cost for all three, with the P&P from Germany was under £42. I honestly have no idea if this was a mistake or what, but it is ridiculously cheap. Even if the collective cost was £200 it would be worth it. The book looks amazing both from the outside and inside. Given the cost, I was dubious what was going to turn up, but this really is a significant work covering most things about the Moon from its role in art and history, to geology, observing, imaging, use of filters etc. A good proportion (a third) is devoted to the observable lunar surface features, with countless photographs, sketches and snippets of historical interest/importance. Volume three carries data, some more historical chapters, multiple maps from previous authors (with commentary and labels), a glossary and a very extensive bibliography. The format inside the book and the print quality is also amazing. Again I would be impressed if this has cost £200, but given it cost less than a quarter of this, I still can't believe they have got the pricing correct. I have no conflicts of interest as I don't know the author and have no connections with Springer, but if you are interested in the Moon, and fancy an all encompassing companion on the Moon, I would strongly recommend getting this. You can only buy the three volumes together. https://www.springer.com/gp/book/9781493916634 James
  13. There is an option in the handset to turn down the brightness of the poor scope LED
  14. Stick a hoover pipe in the polar scope hole on low suction and see if the other label will come out, but I wouldn’t stress too much about; bits of paper in there may improve the periodic error
  15. Thanks. I've ditched the two batteries in series idea for the time being, and just going to stick two big batteries in isolation,one connected to each of the outputs of the dual solar charger. If the two batteries are the same, and the load placed on each is the same, would you set the charging priority to 50:50? I'm still not really sure why the maximum I can send to battery one is 90%, and why I can't send 100% to battery one until its fully charged, then send 100% of power to battery two etc. Or is it sending 10% to battery two by default to at least put a bit of power into battery two to prevent it from degrading whilst battery one charges up? James
  16. Is the firmware the latest? Are any buttons getting stuck in the handset when you press them in?
  17. I asked a few weeks ago about charging two batteries from one solar panel. I’ve now got a solar controller which can do this, see below, but I’m confused by the instruction manual, especially how I should set the “charging priority”. I assumed the unit would charge battery 1 until full, then move on and charge battery 2 until full, then go back to 1. I’m not sure what this charging priority is - image of the relevant page from the manual below. I’d be grateful to hear what you think it means. Thanks. James.
  18. Should I put fuses where the green boxes are, or the purple boxes?
  19. Thanks, that is reassuring. Are you placing a fuse on the positive lead between the controller and the pair of batteries, or between the batteries and the thing they are powering? Or both? James
  20. I’ve since found the Amazon one on Ebay for £14.
  21. Something like this: https://www.amazon.co.uk/ECO-WORTHY-Controller-Auto-adaptive-Digital-Display/dp/B01B4AK9SM/ref=sr_1_10?keywords=Dual+Battery+Solar+Charge&qid=1578578415&sr=8-10
  22. Thanks. What is the capacity of each battery, and how long have you been using this set up with the same set of batteries? James
  23. The batteries will be kept in parallel all the time, and will be connected to the charging unit all the time, I'd envisaged even whilst under load, which will most likely be at night when the solar panels are not producing, but the batteries may also be put under load during the day time when the solar panels are active. One pair of batteries will power one thing, and the other pair power something else.
  24. Is the link suggesting this is just for batteries with capacity of 1-7 amp hours?
  25. If I have one solar panel, and four 12v batteries I need to be charged, two pairs of equal age and capacity (60 amp hour x 2, and 50 amp hour x 2) and the pairs have the same resting voltage and seemingly the same capacity, and I can get a solar charger unit which can charge two batteries (see link below), I was thinking of charging each pair in parallel. I've read about the risks of charging in parallel, with the weaker battery having the dominant impact and bringing the other battery down to its capacity, but in reality, how likely is this to be a problem in the course of 5 years, where the batteries won't be used that much anyway, maybe discharged 20%, just 10 times a year? I'm conscious there is scope to discuss lots of things around this, like "buy pairs of new batteries rather than starting out with old ones" and "buy larger capacity new batteries etc", but this is the set up we have and will be sticking with. Thanks for any replies. James https://uk.rs-online.com/web/p/solar-power-regulators/9054536?cm_mmc=UK-PLA-DS3A-_-google-_-PLA_UK_EN_Power_Supplies_And_Transformers-_-Renewable_Energy|Solar_Power_Regulators-_-PRODUCT_GROUP&matchtype=&pla-391749164546&s_kwcid=AL!7457!3!243856857002!!!g!391749164546!&gclid=CjwKCAiAu9vwBRAEEiwAzvjq-zrEd9pZ-QRkhK-Tpfd6UJFYhRnC8sQOzas0oXPQXq3zr44tGo3_MhoC_XcQAvD_BwE&gclsrc=aw.ds
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