Re: Strange LX200 tracking and PEC problems


William Hamblen wrote:
On 2006-07-17, samosmrke@xxxxxxxxx <samosmrke@xxxxxxxxx> wrote:

I have some strange tracking problems with my LX200. The tracking speed
is somehow very slowly slowing down from the moment I turn on the
telescope. With uncorrected PEC (21600) tracking is a little too slow,
when I do PEC after I turn on the telescope I get somewhere around
21530 pulses from the encoder. For an hour or so the tracking is good
and with a CCD I can take up to three minutes exposures without any
drift. But after that tracking slows down so I can't even to 30s
exposures. If I do PEC again I get numers somewhere around 21450. This
means that the tracking is 0,7% slower than it should be, the
theoretical error in three minutes then should be about 20", what is
preety much the R.A drift I ger.
Has anybody any ideas what could be wrong? Might be something wrong
with the encoders?

Does the LX200 have a programmable tracking rate? Could it be
set to a rate other than sidereal?

Bud

Yes it has, It it set to sidereal. The problem is not that the speed is
too slow (this can be well corrected with PEC) but that the speed is
changing with time.

Samo

.

Relevant Pages

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  • Re: Strange LX200 tracking and PEC problems
    ... With uncorrected PEC tracking is a little too slow, ... when I do PEC after I turn on the telescope I get somewhere around ... Does the LX200 have a programmable tracking rate? ...
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  • Re: Strange LX200 tracking and PEC problems
    ... With uncorrected PEC tracking is a little too slow, ... when I do PEC after I turn on the telescope I get somewhere around ... Does the LX200 have a programmable tracking rate? ...
    (sci.astro.amateur)
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