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22
In the polar mode the Electronic Controller normally tracks
APPENDIX
objects at the sidereal rate (see Sidereal Rate, page 10). For
A
most observing sessions (once the telescope has been polar
aligned and the tracking motor activated), there is little need to
change this speed.
For objects, like the Moon or a comet, that move at slightly
different rates, the Electronic Controller arrow keys (1, Fig. 6)
are sufficient to move the telescope slightly as the object very
slowly moves off-center through the eyepiece field.
To change the tracking rate, for extended observations of an
object not moving at the sidereal rate, follow the procedure for
the appropriate hemisphere:
Northern Hemisphere Polar:
1.
Press and hold the MODE key (5, Fig. 6) until the Mode
function is active (i.e., lights 1 and 2 are on steady; lights
3 and 4 signify whatever tracking mode was last chosen).
2.
Press the SPEED key (3, Fig. 6) until lights 1, 2,
and 3 are on steady with light 4 blinking. The
telescope is now in the Northern Hemisphere Polar
mode.
3.
Press the INkey and light 4 comes on steady. The
tracking rate is now 0.5% faster than sidereal.
Continue pressing IN until the desired speed is
reached.
NOTE:The tracking rate can be increased by up to 65%
(127 presses of the IN key).
4.
To use a rate slower than sidereal, press the OUT
key until light 4 blinks again (sidereal rate). Press
the OUT key again and light 4 goes out, signifying
a tracking rate 0.5% slower than sidereal. Pressing
an additional 3 to 4 times will slow the tracking rate
to the lunar rate.
NOTE:The tracking rate can be decreased by up to 65%
(127 presses of the OUT key).
5.
Press and hold the MODE key until only a single
light is on. This exits the Mode function. If Northern
or Southern Hemisphere polar mode was chosen,
the motor drive starts operating at the sidereal rate.
6.
Use the four arrow keys (1, Fig. 6) to slew the
telescope to the desired object. To change the slew
speed, press the SPEED key.
z
Appendix A:TRACKING MOTOR SPEED
Indicator Light Key
The
procedures
in
this
manual identify the status of
the four indicator lights in a
box
to the left
of the
appropriate step. They are
depicted as on, blinking or
off, depending on the mode
at that point.
Southern Hemisphere Polar:
1.
Press and hold the MODE key (5, Fig. 6) until the Mode
function is active (i.e., lights 1 and 2 are on steady; lights
3 and 4 signify the tracking mode last chosen).
2.
Press the SPEED key (3, Fig. 6) until lights 1 and
2 are on steady, light 3 is off, and Light 4 is
blinking.
3.
Press the INkey and light 4 comes on steady. The
tracking rate is now 0.5% faster than sidereal.
Continue pressing INuntil the desired speed is
reached.
NOTE:The tracking rate can be increased by up to 65%
(127 presses of the IN key).
4.
To use a rate slower than sidereal, press the OUT
key until light 4 blinks again (sidereal rate). Press
the OUT key again and light 4 goes out, signifying
a tracking rate 0.5% slower than sidereal. Pressing
an additional 3 to 4 times will slow the tracking rate
to the lunar rate.
NOTE:The tracking rate can be decreased by up to 65%
(127 presses of the OUT key).
5.
Press and hold the MODE key until only a single
light is on. This exits the Mode function. If Northern
or Southern Hemisphere polar mode was chosen,
the motor drive starts operating at the sidereal rate.
6.
Use the four arrow keys (1, Fig. 6) to slew the
telescope to the desired object. To change the slew
speed, press the SPEEDkey.
Light No.
Light Status
On
Light 1
Blinking
Light 2
Off
Light 3
Light 4
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