Re: Strange LX200 tracking and PEC problems


<samosmrke@xxxxxxxxx> wrote in message
news:1153149331.613798.260510@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
You mean the battery on the LX200 circuit board?
I don't use batteries to power the telesocpe.

I was thinking... is it possible that the grease on the worm gear is
too old and it gets harder when temperature falls during the night and
so the telescope slows down?

Samo
Realistically, no. The motor is a _servo_, and knows how far it has moved,
and will apply more power as needed. This is why if something does impede
the movement, the drives can burn out...
The battery being referred to is the lithium cell that powers the clock
chips.
The scope would only 'slow' under load, if the main power supply was not
adequate. If the supply voltage was falling, there are a number of
possible effects, which might include this one, if for example, the noise
levels internally were rising under load, and leading to spurious encoder
counts being detected.

Best Wishes

Havriliak@xxxxxxx wrote:
How's your battery doing.


samosmrke@xxxxxxxxx wrote:
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



.

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