Re: Issues With Initial GoTos on new GM811G
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Hi Ryan, I had a similar?issue recently. I purchased a used G11 and I had a minor pointing issue, which caused me to replace the battery and do a firmware update. After that my pointing was much more problematic. I tried a bunch of different things, but what I kept seeing was my site and time information was not being stored, even after I just input the information. I could see the information was correct but the pointing was way off. What I found was that if you do not hit the store button on both the time screen, and the site screen, before returning to the go to screen, the information is lost.?
I did not read all the responses, so my suggestion may not apply in your case, but it is worth checking.?
James
On Wed, Aug 12, 2020 at 12:44 PM Michael Herman < mherman346@...> wrote: Hi...
Glad you wrote that detailed report!
Your RA worm gear is set incorrectly to negative, but should be positive.
That will change its rotation direction to be correct.
Note for the future:? If your mount had McLennan metal gearbox (not a stock item but an aftermarket change some people (like me) make), then ? you would need to have the negative RA Worm Gear value.? For the stock plastic gearbox, you would NOT need a negative value.
The correct values for the G11 RA section of your GM811 mount should be the same as for a stock G11 mount: ? ? ?RA Worm Gear:(G11size)? +360. (plastic stock gearbox. Negative for McLennan metal gearbox) ? ?? ? ? ?DEC Worm Gear: (GM8 size) +180. (+ for plastic stock gearbox.? Negative for McLennan metal gearbox)
? ? ?For both axes...same values: ? ? ?Spur gear ratio:? 25? ? (that's the entire gearbox that is 25:1) ? ? ?Servo Encoder resolution:? 256 ? ? Steps per Worm Revolution:? 6400
? ? Manual Slew:? 800??
(many people reduce that to about 600 to put less strain on the motor)
? ?GoTo Slew:? 800? ? (many people reduce that to about 600 to put less strain on the motor)
Anyway, maybe someone had set up your Gemini-2 before you received it.? If you got it direct from the factory...it should be reported.? It should have been tested by whomever sold it to you.
Best regards, Michael
On Wed, Aug 12, 2020 at 11:33 AM Ryan Weiss < rrweiss14@...> wrote: So I just did a couple of trials to see if switching the settings to G811 would fix the issue.? It does not, but working on this in the light gives me a better idea of what is going on.? My post this morning was incorrect about what axis was having the issue, it was not declination, but RA? (I will fully admit to getting them confused sometimes).? It looks like what is happening, at least in part, is that the RA axis is moving in the wrong direction of rotation.? To put it another way, the RA axis rotated clockwise around the RA axis if viewed from the position of looking through the polar scope.? If the RA axis would have moved counterclockwise the same amount from the CWD position, I think the mount would be pointing very close to the location of the star I selected (Mizar).??
I've checked all of the location and time settings and they appear to be correct.? What could be happening to make the RA axis move in the wrong direction?? I have not changed anything in the Mount\Gearing menu, which has the following values:
RA Worm Gear: -270
DEC Worm Gear: 360
RA Spur Gear 50
DEC Spur Gear: 25
RA Motor Encoder: 256
DEC Motor Encoder: 256
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James B