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APPLICATION
Backlash Compensation
Backlash is a momentary stoppage of the tracking motion of the mount that occurs when the
motor gears reverse their rotation. Backlash does not occur while the mount continues tracking
at a constant speed as the gears keep contact with each other, however, it may occur when the
telescope is slewed with different speeds.
Backlash compensation provides a reduced time lag at the point of reversed motion where the
gears lose contact. This provides smoother rotation of the gears on the mount.
Too much tight engagement of the gears will halt the rotation. Make sure that there is slight play.
Note:
• Backlash compensation is not compatible with an autoguider in most cases. Cancel using this
option when you use an autoguider.
First, Checking the Backlash
It is best to use a bright 1st magnitude star in order to check backlash amount for compensation.
Procedure:
1
Precisely polar align the mount.
2
Center a bright 1st or 2nd magnitude star in the field of view of your
eyepiece.
3
Press the Mount button and Call up "Slewing Speed" in the Mount menu to choose the
"Slew VariSpd".
4
Press the Mount button to make the direction keys available. Set the slewing speed between X1.2 and X4.0
with plus or minus button.
5
Pressing the Mount button will turn up the brightness of the button and enables you to choose subsidiary me-
nus. The subsidiary menu appears as you press the left or right direction key each time. Display the "Backlash
X or Y" (X = RA and Y = DEC)" with the left or right direction key. The setting is done individually. The settings
for backlash compensation are defaulted to "X: 0, Y: 0". This manual describes the setting of RA first, but you
can start from either direction, RA or DEC.
Pressing the up or down key will increase or decrease the value by 10 increments and pressing the plus or
minus button will increase or decrease by one increment. The values for backlash compensation are available
between 0 and 99 both in RA and DEC.
Centering the guide star
49
DEC axis
Polar axis
Slew
VariSpd
Star
N X3.0
Backlash
X
00
Backlash
Y
00
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