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libraryman

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Everything posted by libraryman

  1. I am surprised that no one has pointed out that periodic error is not in itself a major issue, it is the shape of the pe curve that is more important. Of course 20 arcsec is quite a bit....but... If the pe curve is fairly smooth and slow; then the corrections will control your mount very well and quite possibly better than a mount with 5 arc sec pe but steeply shaped curve. if you can guide at a fairly low rate.. I.e. 0.5x sidereal or less then you should be fine but if you need say 1.0 x sidereal to keep up with a steep curve then that's a potential problem. Ray
  2. Yes exactly what did, mine is hust 4 inches long, you need the rj11 connectors and the crimping tool. Ray that is very true, however if you plan it well then in principal you should not need to make it long again. yes it's very easy, only 3 wires are involved tx, Rx & grd, just copy what you have already in the original RJ11... Ray
  3. Yes exactly what did, mine is hust 4 inches long, you need the rj11 connectors and the crimping tool. Ray
  4. Yes....if you use PhD version 2.5 dev 3, it has a good assistant to measure very precisely your backlash. Ray
  5. I don't pretend to understand any of these concepts but like many on this great forum; I do ponder the nature of it all. so because of a particular explanation, I ask myself, if gravity is indeed the warping of space time, and the force we feel is a concequence of us falling into the well caused by mass. how does the well change with the stretching of space time? And if space time is stretching what is happening to it...is is getting thinner, as a fabric might. as you can see it's all strange to my mind Ray
  6. This is my solution, it works very well, I don't even tighten the two outside ones, just pinch them up. Ray
  7. Hehe really pleased with your replies on this one, I'm in exactly the same boat..I've framed it just like you have and I have half the data I want. S11 is really strong and I've been lucky to be able to capture several hours worth but it's a long task with our darn weather! clear all night tonight but just too much moon to bother. Ray
  8. If your orientation is set in a way that your calibration shows your movement in north, as north and your calibration shows east as east. and you angle of rotation is either zero or 180degs or close enough. Then it makes it easier to diagnose what's going on, other than that it makes no difference. I can't remember if the qhy5 has a square sensor or not, my qhy 5-Lii is oblong. Ray
  9. From the phd2 developers, it is recommended that you calibrate at Dec zero, east of the meridian, then slew to target...PhD will take account of your then declination and make the appropriate adjustments. this has been my method since phd2 implementation, I do one calibration then just reload it when I want to image, I never calibrate on target or after a meridian flip. i may renew the calibration from time to time and defiantly if I move the guide camera. Ray
  10. I see your post on the PHD forum, Bruce is very knowledgable, he has given you some good suggestions, I hope they help to solve your guiding problems. Ray
  11. If you turn off the guiding you will see the raw drift, seeing etc, just as the assistant does. if you take off the covers, what can you achieve? I would guess not much. first things first as suggested, joining the forum is easy, upload a guiding log to them, they are preferred to help them diagnose your problems. Ray
  12. Scary graph.....try to get to phd2 website, there is a help forum and they are very good, Bruce and Andy will guide you..pun unintended. your Dec backlash is large as pointed out, you can lower your mx Dec motion so that it does not make really dramatic swings. your pa is reported as 0.3 arc mins which on the face of it sounds o.k but.....you have only run the assistant for just over a min and that's not long enough for a reliable reading.... if im not mistaken you have been given good advise on polar alignment, just make sure that is right first. ph settings are unlikely to be your issue, polar alignment, balance, cable drag......flexure..... you seem to have nailed. then you can start to look at PhD. have you done a good calibration at Dec zero? Post a screen shot of that. Ray
  13. To be honest, I would stick with the mini guider, ifs easier to mount, less prone to flex urge and probably lighter, all good things. but of course you have to sort the focus issue and that's perhaps down to adapters etc, have a word with Bern at Modern astronomy, he may be able to sort you out correct adapters. Ray
  14. http://www.cloudynights.com/topic/493978-rms-and-guide-scope-focal-length/ This might help to get a hang on RMS. Ray
  15. O.k I would suggest raising them a little ...perhaps 0.7 x (70%). or perhaps 0.1x and test....lower aggressiveness can be used then. Ray ps..plate solving has nothing to do with polar alignment and does not guarentee it.
  16. Sorry joe, I use Eqmod it's easy in there but I don't know what you use, perhaps someone familiar with you set up can assist but at a 1st guess, look in the hand paddle set up. run the guiding assistant and enable backlash correction it may help with the Dec issue. Ray
  17. Actually, just re-looking at the guide log....it appears to say that your rates differ slightly.0.8x & 1.0x so the rates should be fine...but...the log shows all correction on one side for a time then on the other side for a time when ideally it should be a little more balanced, in addition ..you appear to have some backlash in Dec, and that's taking time to correct. Which led me to suggest upping the guide rate turn the aggressiveness down a bit ..perhaps 70. But do make sure your alignment is good, use PhD your polar scope alignment is unlikely to be close enough really and that would require higher rates and more aggressiveness to correct the lager excursions. Ray
  18. Your guide log shows a very slow reaction to corrections, I would suggest looking at you guiding rate and if possible choose a rate between 0.5x & 1.0! Ray
  19. Post a screen capture of your PhD guiding screen, you can also down load PhD log analyser.load into it your last guide log and post a screen shot of that. Ray
  20. Ooh that's a question close to my heart? I have modified mine from day 1....I have to take mine out to mount it on the tripod for every session (I don't like leaving it outside for days on end) so for me a quick and repeatable set up was necessary, to that end I mounted all I could on the head including my dew controller my focus controller and I made a power distribution box (very small) into which I plug my ancillaries that sits on a bar mounted where the polar scoop is supposed to fit... im really pleased with how the eq8 takes mounting equipment on it and it makes my set up a breeze. Ray
  21. Hi n welcome from yet another Stoker.. Ray
  22. Sounds like a plan...you don't need to get lower than 20 degs altitude in the west for pa so your fine. Ray
  23. I use an eq8 and pull it apart after every session....try to use phd2 to pa if you can see due South and an east or west horizon, pits so intuitive when you get used to it, never used the handset. i also use the homing tool on the yahoo site and just downloaded driver ver 29a it has the auto select for the eq8. Ray
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