Handleiding Meade ETX-90AT (pagina 29 van 60) (Engels)

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■ Tracking Rate: Changes the speed at which the telescope tracks targets in the

sky.

Sidereal: The default setting for Autostar; sidereal rate is the standard rate

at which stars move from East to West across the sky due to the rotation of

the Earth.

Lunar: Choose this option to properly track the Moon over long observing

sessions.

c. Custom: Allows entry of user-defined tracking rates.

■ Reverse L/R: Reverses the functions of the Left and Right Arrow keys (i.e., the

Right key moves the telescope to the left)

■ Reverse UP/DOWN: Reverses the functions of the Up and Down Arrow keys

(

i.e., the Up key moves the telescope down).

■ Quiet Slew: Sets the maximum slew rate to 1.5° for quieter operation.

■ Max Elevation: Allows you to enter a value in degrees that sets a limit as to how

far the optical tube can swing upward during a programmed slew. (Note that it

does not prevent you from performing a manual slew past this limit.) This is use-

ful when you have a camera or other peripheral attached to the telescope—you

can prevent it from striking the telescope base.

■ Min AOS (Acquisition of Signal): Allows you enter a value in degrees. This

value represents the altitude at which your telescope begins to slew when

acquiring a satellite track. This is useful when you are observing satellites, but a

tall tree or building is obstructing the telescope. For example, you might begin to

track the satellite at 15° altitude, instead of 5°. See OBSERVING SATELLITES,

page 32, for more information about satellites.

■ Calibrate Motor: If the telescope motors appear to have a problem, use this

option to retest the motors before performing a Reset. This option is also used if

an Autostar unit is moved between telescopes, to match Autostar to the new tel-

escope. To calibrate the motors, select this option and press ENTER.

■ High Precision: If High Precision is turned on, when looking for a faint celestial

object (

i.e., a nebula or galaxy), Autostar first slews to a nearby bright star and

displays "ENTER to Sync." Center the star in the eyepiece, then press ENTER.

At that point the telescope has a high precision alignment to that part of the sky

and it then slews to the object that was originally requested.

Targets switches between Astronomical targets and Terrestrial targets. If

"Astronomical" is selected, the telescope tracking motor is activated and any object

you observe will remain centered in the eyepiece. If "Terrestrial" is selected and the

telescope is aligned, the tracking motor is turned off. To learn how to track an object

automatically, see page 20.

Site provides access to several options including:

■ Select: Displays the currently selected observing site. Use the Scroll keys to

cycle through all available sites (see "Add" below). Press ENTER when the site

you wish to select displays. Use this option when you move to a different

geographic location.

■ Add: Allows you to add new observing sites to the database (up to six sites may be

stored). Scroll through the list of Countries/States. Press ENTER when the site you

wish to add displays. Then choose the desired city in the same manner.

■ Delete: Deletes a stored site from the database.

■ Edit: Edits a selected site, including: the name, latitude, longitude and time zone.

Time Zone refers to the Greenwich Mean Time (GMT) time zone shift. Users

West of Greenwich, England use “-” hours, East of Greenwich use “+” hours. For

the United States, look up the time zone shift in table above.

NOTE: Autostar compensates for daylight savings time, if selected. See

“Setup Menu: Daylight Saving,” page 28.

Tip:

If the "ENTER to Sync"

feature is accessed by

mistake (holding the

ENTER key for more than

2 seconds), press MODE

to return to the previous

screen.

Want to learn more about

adding and editing sites?

See page 31.

Time Zone Shift

Atlantic -4 Hours

Eastern -5 Hours

Central -6 Hours

Mountain -7 Hours

Pacific -8 Hours

Alaska -9 Hours

Hawaii -10 Hours

Table 1: Time Zone Shift.

Calculations are for standard

time.

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