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10.
SLEW RATE: Option #10 in the TELESCOPE menu is
for changing the slew rate of the LX200 telescope. Slowing
down the slew rate will result in less noise as the telescope
moves and will also use a little less power. To change the
slew rate, follow these steps:
a.
Press the MODE key on the keypad until the
TELESCOPE/OBJECT LIBRARY menu appears. The cursor
should be next to the TELESCOPE option — if not, press
the PREV key to move the cursor up one space.
b.
Press ENTER to select the TELESCOPE functions. c.
Press the PREV or NEXT keys to move the cursor to
option #10: SLEW RATE. On the right hand part of
the display, the number 4 is displayed. This represents the
current slew rate in degrees per second.
d.
Press the ENTER key to change the slew rate. Each
successive ENTER key press increments the slew rate by 1
degree per second.
e.
After setting the desired rate, press the MODE key to
return to the TELESCOPE/OBJECT LIBRARY menu.
NOTE: The slew rate is NOT stored in permanent memory
and needs to be reset each time the telescope is powered up.
The default slew rate is 4 degrees per second.
11.
BACKLASH: The Backlash feature is only available in
the
POLAR mode.
When taking long exposure astrophotographs, it is necessary
to "guide" the photograph to make sure the telescope is
tracking perfectly, otherwise stars will appear as ovals instead
of pinpoints. This is done by setting the LX200 keypad to the
GUIDE speed, monitoring the star location (e.g. with an off-
axis guider), and making small corrections to the telescope
position by using the N, S, E, and W keys.
When making these corrections, the R.A. motor will speed up
or slow down (by pressing the "E" and "W" keys). The
Declination motor, however, when activated (by pressing the
"N" and "S" keys) will actually stop and reverse direction.
Because of backlash in the Declination motor gearbox, there
will be a few seconds delay before the telescope begins to
move when reversing direction.
The Dec. backlash feature compensates for the Dec. motor
gearbox backlash and provides instant telescope movement
when the motor is reversed.
To program the Dec. backlash, use this procedure:
a.
Move to option #11 from the TELESCOPE menu.
The keypad display will show:
"'11) BACKLASH 00"
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LX 200-10 pouces
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