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EM200 Tracking Issues   Message List  
Reply Message #52107 of 53303 |
Re: EM200 Tracking Issues

John are you in Tampa or the pandhandle? I am looking for local help when the
mosquitoes go away.

--- In UncensoredTakGroup@yahoogroups.com, John O'Neill <John@...> wrote:
>
> Don:
> I had a EM-200 and had guiding issues until I found that I was not
> adjusting the time to standard (in the instructions, but missed that
> part) during my polar alignment. Maybe this could be your problem.
> Once I got the offset and time right, the mount worked flawlessly.
>
> Tak doesn't put in PEC training because the error is so low it
> doesn't need it, besides good tracking software is in affect acting
> as a PEC corrector. IMHO the EM-200 is one the finest medium sized
> mounts in the world, that is why I now own an EM-400. At +/- 3 arc
> sec error who needs PEC.
> John O'Neill
> Seminole, FL
>
>
>
> On Nov 6, 2009, at 7:27 PM, Don wrote:
>
> > Hi all,
> >
> > I've been imaging using my EM200 mount and have to manually guide.
> > I did the drift method and DEC drift had ceased but the RA needs to
> > be corrected. There is no PEC for this mount which is unfortunate.
> > My friend commented that I paid a lot of money for the mount and
> > there is no PEC? I told him that hopefully Takahashi hopefully will
> > at some point incorporate it into the future mounts. Not sure if
> > there are any plans or if the newer mounts have PEC now? If you can
> > train out the errors you can take images for sveral minutes without
> > making corrections.Anyway is there anything out there such as third
> > party software?
> >
> > Thanks Don
> >
> >
>
>
>
> [Non-text portions of this message have been removed]
>





Mon Nov 9, 2009 12:13 am

thartcfl
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Message #52107 of 53303 |
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Hi all, I've been imaging using my EM200 mount and have to manually guide. I did the drift method and DEC drift had ceased but the RA needs to be corrected....
Don
whirlpoolgal...
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Nov 7, 2009
12:28 am

Don: I had a EM-200 and had guiding issues until I found that I was not adjusting the time to standard (in the instructions, but missed that part) during my...
John O'Neill
tmb929
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Nov 7, 2009
1:35 am

... A very important point. Even assuming very long guiding exposures (say 10 seconds) the error from everything else will be higher than the worm PE. Even...
Gene Horr
genehorr
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Nov 7, 2009
2:03 am

Just to add to the previous points I only image at 530mm but PEC   ... From: Gene Horr <genehorr@...> Subject: RE: [UncensoredTakGroup] EM200 Tracking...
Tom O'Donoghue
tomodonoghue
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Nov 7, 2009
2:55 am

Apologies, just to finish that, I don't find PEC necessary on this mount. Its accurate enough as it is. ... From: Tom O'Donoghue <tomodonoghue@...> ...
Tom O'Donoghue
tomodonoghue
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Nov 7, 2009
2:57 am

Sure, control theory would always give PEC priority.: it's better to adjust the motor speed on time than wait for an error and react. But todays guide systems...
Hartmut
hvb356
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Nov 7, 2009
8:25 am

Autoguiding, with or without PEC, can remover low frequency errors (slow upslope and slow downslope relative to the length of one autoguide cycle. PEC can...
ancient.sull
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Nov 7, 2009
6:24 pm

John are you in Tampa or the pandhandle? I am looking for local help when the mosquitoes go away....
thartcfl
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Nov 9, 2009
12:14 am

Hi all, Thanks for the responses. I am not using an autoguider. I manually guide. I imaged last night and this is what I noticed. I took ten images ranging...
Don
whirlpoolgal...
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Nov 10, 2009
2:17 am

Don - just for grins what is your longitude and what offset are you using? And, I've also had tracking problems when I had forgotten to level the bubble...
John
jjohnnyha
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Nov 10, 2009
7:53 pm

You're not properly polar aligned, hence star trails....
surfndaojai
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Nov 11, 2009
4:13 am

Hi John, I'm in central NY. 45 degrees by 75 degrees give or take. I think the offset is near zero or one at most. I did a drift method to rid of DEC drift....
Don
whirlpoolgal...
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Nov 11, 2009
11:42 pm

Don, Did you setup the sliding ring thing on the back of the mount that is supposed to deal with offset from the middle of the "time zone"? In my opinion,...
rlnielsen1960
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Nov 12, 2009
2:24 am

Hi Don, Have you tried PolarAlignMax? Its acccurate, takes the drudgery and guesswork out of polar alignment, and above all it's free. See...
Dale Liebenberg
dale.liebenberg
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Nov 12, 2009
6:20 am

Don, the EM200/400 have perfect polar scopes and they do a lot for you but before you start, the bubble must be leveled and the offset scale in a position...
Hartmut
hvb356
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Nov 12, 2009
9:37 am

Hi Don It could be the case that your bubble level is not properly calibrated. If you have set up the mount very well polar aligned using drift method, and you...
Pawel T. Lancucki
plancuck66
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Nov 12, 2009
12:44 pm

Thanks everyone for your input. If it clears tonight I may check the alignment again and be sure the offset is correct and the bubble level is level. As far as...
Don
whirlpoolgal...
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Nov 12, 2009
10:14 pm

Don - Roughly align your scope by sight. Power on. Loosen the bolt holding the mount to the tripod a bit so the mount can move in AZ, and the clutch for the...
John
jjohnnyha
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Nov 13, 2009
2:11 am

Hi all, I went out last nigth to recheck my polar alignment. In the first attempt at precise polar alignment I used my TOA-130 with a 12.5mm reticle EP....
Don
whirlpoolgal...
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Nov 13, 2009
11:08 pm

Don, I wonder if it would be beneficial to have the 7 arcsecond drift *centered* in the reticle ... so the star drifted right and then left around the "mean"...
rlnielsen1960
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Nov 14, 2009
2:38 am
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