Strange LX200 tracking and PEC problems

Hi!

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?

Clear Skies!

.

Relevant Pages

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