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  1. #1
    James32712's Avatar
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    Default New LX90-ACF w/GPS - setup and alignment questions



    I just got my new scope a few weeks ago but am confused about a few things when it comes to setting it up and aligning it. Mys scope has gps and lnt technology. With that in mind, why does the scope ask me whether I want to align using true north or compass north? Does it matter what position the scope is in when I let it find it's first star?

    Really confusing because I only got the 2 star alignment to work correctly once! It is usually far off the alignment star and I have to make a pretty Major adjustment just to get the star in the viewfinder. It never is anywhere close, so what's happening is I sometimes don't know what alignment star it is trying to get especially when there are a few bright points in that general area.

    I think I am doing something wrong. I thought this scope was pretty much a self aligned scope that I would just have to verify and make small adjustments in the eyepiece. I literally have to use the side scope just to get the main scope close to the alignment star...that is how far off it is.

    Any help from others with lx90 or equivalent would be much appreciated. This is my first scope that is computerized. I love it, and would love it sooooo much more if the alignment would play nicely as mead advertises. "set it and go"

    Thanks all!!!!

    James
    Orlando, FL

  2. #2
    somecdnguy's Avatar
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    Default

    I am not too familiar with the LX90 but like other goto scopes you still have to do at least a rough polar alignment manually. Check the tripod to see if there is a N or a picture of a star and point that one north. Just try to eyeball polaris and align that tripod leg with it and you should be ok.
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  3. #3
    Bob327's Avatar
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    I unfortunately am not familiar with MEADE fork mounted scopes...

    BUT I assume that the GPS will pick UP Magnetic North...like the older N&L Celestrons but after you align the scope it will do the math and calculate the offset between Magnetic North and Celestial North ... AND REMEMBER this VALUE...

    If you are concerned that the second alignment star IT PICKS never seems to be in the FOV of the Eyepiece or finder scope when the slew stops... This is pretty much NORMAL because the scope is at this point only guessing where it is and still has not mapped out the sky... BUT normally you should be able to tell which star it was "attempting" to find so just slew over to it, center it and you should be good to go the rest of the night....

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  5. #4
    blaise's Avatar
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    It has been a while since I used my LX90 without a wedge, but I will try to help.

    I would first go to Meade's webpage and download the manual. You may have one handy but I find that being able to search quickly by keyword saves some time.

    Place your mount and OTA as close to magnetic north as you can. I can't recall if this is important or not in alt/az mode, but it can't hurt.

    Turn your mount on and train your drives. You will have to use something like the peak of a distant roof or a telephone pole. Use something that doesn't move. The process only takes about 5 minutes. This will help your gotos.

    Next, find in the manual where it tells you how to calibrate sensors and motors. I believe it's in setup/telescope. Some say this is a crucial first step when receiving your new LX90. This will help in correcting any errors in the GPS and drives that might have occurred during shipping. Often, it has been said that vibration can pull things out of wack. Calibrating is a good idea. I read a response from one user who said he lived near an iron ore deposit and it threw his GPS off. So calibrate those sensors.

    You can turn your mount off if you want after you calibrate sensors and motors as well as after you train the drives. I have found that if I run the routines and turn the scope off and start again, all is well. However, if you have aligned your scope and turn it off, you must start the alignment procedure all over again. You do not need to calibrate sensors/motors or train your drive often. Do it once and see how it works.

    Next, pick easy alignment. The stars that Autostar will pick for you should be somewhat close. Before the wedge and after the wedge, I have never experienced alignment stars dead center of the eye piece or telrad. You will need to slew to the alignment stars.


    I was really impressed with the initial performance of my LX90. It really did as advertised. You will probably want to find the "high precision" routine. This will really help getting those objects in the center of the eye piece. I think it's on page 29 of your manual. My jaw literally dropped at the accuracy of the scope after I did the high precision.

    I am unsure of how the LNT is different than my version (GPS), but I would like to think they are pretty close.

    I hope this in some way helps you. If you still have a problem, post and I will try to help.
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    You should also try to get some sort of star chart. Knowing the stars and costellations helps you to pick out exactly which star the alignment is trying to go to, and it's also pretty useful for astronomy in general. I subscribe to Sky & Telescope, and they have a pretty good sky chart every month in their issues.

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  9. #6
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    Sorry for the long delay, I was traveling and just got your reply. I am going to do your steps today. And I just received my new 18mm UWA Series 5000 eyepiece today as well, so hopefully I will have some success. Your assistance (and everyone elses) is greatly apprecaited!!!!!

    James

    Quote Originally Posted by blaise View Post
    It has been a while since I used my LX90 without a wedge, but I will try to help.

    I would first go to Meade's webpage and download the manual. You may have one handy but I find that being able to search quickly by keyword saves some time.

    Place your mount and OTA as close to magnetic north as you can. I can't recall if this is important or not in alt/az mode, but it can't hurt.

    Turn your mount on and train your drives. You will have to use something like the peak of a distant roof or a telephone pole. Use something that doesn't move. The process only takes about 5 minutes. This will help your gotos.

    Next, find in the manual where it tells you how to calibrate sensors and motors. I believe it's in setup/telescope. Some say this is a crucial first step when receiving your new LX90. This will help in correcting any errors in the GPS and drives that might have occurred during shipping. Often, it has been said that vibration can pull things out of wack. Calibrating is a good idea. I read a response from one user who said he lived near an iron ore deposit and it threw his GPS off. So calibrate those sensors.

    You can turn your mount off if you want after you calibrate sensors and motors as well as after you train the drives. I have found that if I run the routines and turn the scope off and start again, all is well. However, if you have aligned your scope and turn it off, you must start the alignment procedure all over again. You do not need to calibrate sensors/motors or train your drive often. Do it once and see how it works.

    Next, pick easy alignment. The stars that Autostar will pick for you should be somewhat close. Before the wedge and after the wedge, I have never experienced alignment stars dead center of the eye piece or telrad. You will need to slew to the alignment stars.


    I was really impressed with the initial performance of my LX90. It really did as advertised. You will probably want to find the "high precision" routine. This will really help getting those objects in the center of the eye piece. I think it's on page 29 of your manual. My jaw literally dropped at the accuracy of the scope after I did the high precision.

    I am unsure of how the LNT is different than my version (GPS), but I would like to think they are pretty close.

    I hope this in some way helps you. If you still have a problem, post and I will try to help.

  10. #7
    James32712's Avatar
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    Blaise - I followed your steps and did the maintenance stuff. Hopefully the training and calibrating works - it all went smoothly. I will let you know how the sky alignment works when we get a clear night.

    THANKS AGAIN!!
    James

  11. #8
    blaise's Avatar
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    That's great, James. Please do post a report. I, as will anyone here, will be happy to help.

    One more thing while I am thinking of it. Again, I can't remember how important this is in alt/az mode, but try to level your scope. If you have a torpedo level around, once you have your scope completely put together and ready for viewing, adjust the tripod legs and adjust the level of the unit at the back, front and sides. I never like to adjust level until I have it completely together because there are variations in level between the field tripod and the actual OTA unit that sits upon it.
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  12. #9
    James32712's Avatar
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    Blaise - its working perfect now after following the directions you all provided. I now align within 2 minutes, and am good to go. I just posted another thread on my next issues - cant see anything but planets, even items that Astronomy Magazine and others say I should be EASILY able to see with "any" backyard scope. I want to see a gallaxy or nebula. See my other post, maybe you can save me again. lol

  13. #10
    blaise's Avatar
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    Glad it's working (to some extent). I'll go find your other post and see if I can help.
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