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You can see CNTR (center) and GUIDE motions only while

looking through the telescope. The red LED light next to the

appropriate key (3, Fig. 6) lights, indicating the speed

selected. Press one of the four direction keys (2, Fig. 6) to

move the telescope in that direction at the selected speed.

You can move the LX200 manually with the R.A. and Dec.

locks released or as described above. When the power is

on, use only the N, S, E, and W keys on the keypad hand

controller.

Using the LX200 In ALTAZ (Altazimuth ) Mode

The two quick-start methods described above allow you to use

the telescope, but they do not use the computer features

available, including finding objects from the object library and

automatic tracking of stars.

For these features to work, the telescope’s power must be on,

and the computer needs some basic information, which is

entered through the keypad. Once entered, the information is

permanently remembered by the telescope’s computer and

need never be entered again, even if the telescope is turned on

and off.

This section explains which keys to push to get the minimum

data required into the computer (see

MODEFUNCTIONS

, page

17, for detailed instructions). The steps detailed here take a few

minutes and allow you to begin making using all the LX200

features.

1. Entering Basic Information

For the LX200 to make the conversions between the stellar

coordinate system (R.A. and Dec.) and the altazimuth

coordinate system (altitude and azimuth), it needs three pieces

of information. This information must be entered once — the

LX200 remembers data even when the power is off. However,

check and reset the time, if necessary, at each observing

session.

2. Location of the Observing Site

NOTE:The SITE information cannot be entered if the telescope

is in LAND mode.

If the telescope is in LAND mode, the SITE menu option (display

2) will appear in lower case letters (see Which Alignment

Method to Use, page 13). Follow steps 4 through 8 in Setting

up the Telescope, page 11, to change the telescope’s operation

to altazimuth (ALTAZ) mode before proceeding.

You should find the position of your observing site to within one

or two minutes of arc in both latitude and longitude. Many

automobile, pilot, and topographical maps, as well as most

atlases show latitude and longitude in 15-minute increments or

better. The accuracy of the LX200 will depend on how close

you get, so take a little time to get as accurate as you can.

Once you ascertain the above information, you can enter it into

the telescope. It is easiest to enter the data with the telescope

sitting on a table indoors—do not try to do it outdoors at night.

This section presents the steps without details or explanations

to keep the process simple. Next to each step is a sample of

what the keypad hand controller display (1, Fig. 6) should look

like after each step.

As an example, we will enter the data for Irvine, CA (LAT =

33°35', LONG = 117°42'). If at any time you get lost, turn off the

telescope and restart this procedure.

a. Turn the telescope power on. After a few seconds (after

the diagnostic self-test completes), the display looks like

Display 1.

Display 1

b. Press the ENTER key. This selects the TELESCOPE

functions. The display should now look like Display 2.

Display 2

c. Press the ENTER key. This selects the SITE functions.

The display should look like Display 3.

Display 3

d. Press and hold the ENTER key until the keypad hand

controller beeps. This selects the first site for editing. The

display should look like Display 4, with the first A flashing.

Display 4

e. Press the ENTER key. The display should look like

Display 5.

Display 5

f. Use the number keys to enter your latitude. The underline

designates the current cursor position. You can correct

mistakes by moving back (using the E and W keys). Enter

a negative latitude by positioning the cursor under the plus

(+) sign and pressing the NEXT key (the lower right-hand

key). When the latitude is correct, press ENTER. The

display will look like Display 6.

Display 6

Fig.6: Keypad hand controller. (1) Display); (2) Direction

keys; (3) Speed indicator LEDs; (4) Speed selection keys.

Motion Speeds

SLEW (7) = 4°/sec

FIND (4) = 1°/sec

CNTR (1) = 240 arcsec/sec

GUIDE (0) = 30 arcsec/sec

TELESCOPE

OBJECT LIBRARY

1) SITE

2) ALIGN

1) A A A

2) A A A

1) A A A

2) A A A

LAT = +00° 00’

LONG = 000° 00’

LAT = +33° 35’

LONG = 000° 00’

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 59 60

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