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    Arya's Avatar
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    Question Problem with aligning LXD75



    Hello!
    I just got my first telescope, it is on a LXD 75 mount. I have a very hard time polar aligning the telescope and after a few attempts I managed to have the telescope track the objects but the go to feature does not do a good job at actually " going to the object" so everything is almost 20 degrees off... I will have to slew the telescope to moon or jupiter ( the two objects that can be found well)
    What am i doing wrong here? How should i use the scope that is on the mount to polar align? Or to be more precise...how do i polar align?

    Thanks a lot in advance, I appreciate the help.

  2. #2
    lan c's Avatar
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    Hi , If you go to the telescope mounts forum , all the info on polar aligning is there , have you trained your drives ? also what power supply are you using ? these mounts dont realy like dry cell batterys ! I like a lot of others run our mounts off a 12v power pack to stablise the voltage , i have the same mount and my gotos are pritty good !
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    Hi alan...thanks! I use the 12 v power adapter...i will go check the thread.

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    lan c's Avatar
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    Hi , is that a mains power adaptor ? if it is make sure it puts out more than 5amps , also a lot of people dont like these as you can get power spikes with them , most prefer a power tank of some discription , i use a camping pack with a 45 a/h battery in it , this gives me enough power to run my mount and also a inverter to power my laptop ! but if you can get a 12v mobility scooter battery or one of a golf cart these are idealy suted for us as they are deep discharge batterys and dont spill acid if they are knocked over !
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    114 newt, various plossel ep's , eq3-2 mount with cgm4 motors grafted on , Meade lxd 75 mount , 45a/h camping pack !!and learning that there are more cloudy than clear nights in the uk !!! and unoffical topic killer !!!!
    Alan

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    Make sure all the setup in the hand controller is correct-- time, date, and site, and daylight savings time = NO right now in the USA.

    The tripod should also be level before you start your polar alignment.

    Read this:
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    The earth rotates 15 degrees per hour - many times GOTO/alignment problems in the 15 - 20 degree range indicate that either your time zone is incorrectly set, or you have not adjusted properly for daylight savings time (on vs. off).
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    You haven't given us your procedure, so it's kind of hard to say what you might be doing wrong. It sounds like you track OK once you have it centered. Seting the right time sounds most likely.

    Did you calibrate motors and train the drive? Did you use two stars as far apart as possible and as close to the equator as possible? Aligning the mount doesn't align the scope.

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    Hi ken, Here is my procedure:
    I set up the mount, make sure it is leveled ( although i dont think its perfectly level due to the surface) then i find polaris and point the mount and scope towards it. ( is it where the mount finder scope come along for aligning? )
    Then i start up the handset. I believe i have made a mistake in DST ( should it be on for winter time?) then I set the telescope for single or double star alignment. ( every time i start the process a different set of stars show up.that is confusing) so far i dont know if the scope is even pointing to the right stars....so it is more like trial and error which results in a lot of error for the go to but the tracking works. The last time i tried the handset kept saying " alignment failed" so...no go to and no tracking. I still dont know where im going wrong. I appreciate the help...thanks everyone.

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    The mount sight is to assure the one axis points toward the pole. Note that Polaris is close to the pole but about 0.4 degrees away. It circles the pole too. So to be precise you need to know where Polaris is when you set the polar axis.

    Other than time it looks like you are doing OK. My handset allows me to select the two stars. Otherwise you need to know the stars that show up on the handset. You should expect the first one to be a few degrees off. The second star will be a little closer. But each must be centered before you hit the button. Meade claims the selected star should be the brightest star nearby. But in a good dark sky I sometimes can't tell unless I know the name.

    "Alignment failed" only occurs when two stars are impossible for the computer to reconcile or a time out occurs.

    Be sure to calibrate motors and train the drives.

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    I have the same mount and the same problem. I run it off an AC adaptor through the mains. I've trained the drive using the terrestrial landmark method. I've set the latitude correctly as well. My problem is that I can't see Polaris from my house due to houses and mountains (I live in Hong Kong), so I use an electronic compass to align my scope to true north instead, then rely on star alignment. It gets pretty close on the first star in my 26mm EP, then even closer on the second star. It then reads 'align successful'. I test it on Sirius as it's very bright over the ocean where I live, and also on the three stars of Orion's Belt. It's pretty damn accurate on those stars, but when I try a solar system object it's way out! The time is correct, daylight saving is correct (no DLS in Hong Kong), and so is my location. It really bugs me. Anyway, I now use an amazing iPhone app called Star Chart that uses GPS. You just point your phone anywhere in the sky and it tells you exactly what you're looking at in real time using a 3D rotating image! You can also search for objects and it tells you where to go with an arrow. I think I'll just find objects myself now like the good old days (except the iPhone app of course!) by working out how to use a star chart and coordinates, it also sounds more fun. But yes, it is annoying when you've paid for GoTo features and they are useless half the time. Maybe I'll upgrade to the LXD 80 after my tax bill :-)

    Good luck...

 

 
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