Manual Celestron CGEM II (page 20 of 161) (English, German, French, Italian, Spanish)

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20 | ENGLISH

tracking in the same direction past the Meridian without the

need to “ﬂip” the telescope around to the opposite side of

the mount (see Meridian feature above). Using the ﬁrst example

above, the user could slew the telescope in R.A. (azimuth)

until it reaches the point that the cables are extended to their

maximum. Then by displaying the telescope’s azimuth in this

position (by looking at Get Axis Position under the Utilities

menu) you can determine the telescope’s azimuth at its most

extended position. Enter this azimuth reading for either the

maximum or minimum azimuth slew limit to ensure that the

telescope will not slew beyond this point. The telescope slew

limits can be set to automatically stop anywhere between

40° above level to 20° below level. To set the R.A. slew limit

select the following:

• R.A. East Limit – Enter a number between +40° to -20°

to deﬁne the slew limit when the tube is on the east side of

the mount.

• R.A. West Limit – Enter a number between +40° to -20°

to deﬁne the slew limit when the tube is on the west side

of the mount.

• Disable Limits – This disables any pre-deﬁned values

that have been entered and allows the mount to track the

maximum amount pass the Meridian (i.e., -20° on both

sides).

Warning: In order for the telescope to be able to slew to a

star from the direction that minimizes the amount of backlash

in the gears, it may be necessary for the telescope to slew

beyond the speciﬁed slew limit in order to approach the star

from the correct direction. This can limit your ability to slew to

an object by as much as 6° from the R.A. slew limit set in the

hand control. If this proves to be a problem, the direction that

the telescope takes to center an object can be changed. To

change the telescopes slewing direction, see GoTo Approach

under the Scope Setup menu.

Custom Rate 9 – This allows you to customize the speed at

which the mount slews to a target. You can set the R.A. and

Dec axes individually.

Utilities Menu

Scrolling through the MENU (6) options will also provide

access to several advanced utility functions within the

telescope such as; Calibrate Mount, Hibernate as well as

many others.

Calibrate Mount – In order to optimize the performance

and pointing accuracy of the telescope, the mount has built-in

calibration routines allowing it to compensate for mechanical

variation inherent in every German equatorial mount. Each

calibration is completely automatic and in most cases only

needs to be performed once. It is highly recommended that

you take a few minutes to go through the mount calibration

procedures.

• R.A. Switch – This procedure records the offset error

when the right ascension index mark is aligned at start-up.

Calibrating the R.A. Index will improve the accuracy of your

initial star alignments when aligning the telescope in the

future.

• GoTo Calibration – GoTo Calibration is a useful tool

when attaching heavy visual or photographic accessories

to the telescope. GoTo Calibration calculates the amount

of distance and time it takes for the mount to complete

its ﬁnal slow GoTo when slewing to an object. Changing

the balance of the telescope can prolong the time it takes

to complete the ﬁnal slew. GoTo Calibration takes into

account any slight imbalances and changes the ﬁnal GoTo

distance to compensate.

Home Position – The telescope’s “home” position is a

user-deﬁnable position that is used to store the telescope

when not in use. The home position is useful when storing

the telescope in a permanent observatory facility. By default

the Home position is the same as the index position used

when aligning the mount.

To set the Home position for your mount, simply use the

arrow buttons on the hand control to move the telescope

mount to the desired position. Select the Set option and

press Enter.

Select the GoTo option to slew the telescope back to the

Home position at any time.

Factory Settings – Returns the hand control to its original

factory settings. Parameters such as backlash compensation

values, initial date and time, longitude/latitude, along with

slew and ﬁlter limits will be reset. However, stored parameters

such as user deﬁned objects will remain saved even when

Factory Settings is selected. The hand control will ask you

to press the “0” key before returning to the factory default

setting.

Version – Selecting this option will allow you to see the

current version number of the hand control and motor

control. The ﬁrst set of numbers indicate the hand control

software version. For the motor control, the hand control

will display two sets of numbers; the ﬁrst numbers are for

azimuth and the second set are for altitude.

Get Axis Position – Displays the relative altitude and

azimuth for the current position of the telescope.

GoTo Axis Position – Allows you to enter a speciﬁc relative

altitude and azimuth position and slew to it.

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Celestron CGEM II Manual

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