Meade LX200 Instruction Manual

Instruction Manual

7" LX200 Maksutov-Cassegrain Telescope 8", 10", and 12" LX200 Schmidt-Cassegrain Telescopes

Meade Instruments Corporation

8.218"

8.016"

8.0"

Primary Baffle Tube

Field Stops

Primary Mirror

Ray (1)

Ray (2)

(2)

(1)

(2)

(1)

1/2°

Secondary Mirror

Correcting Plate

Secondary Baffle

(2) (1)

Focal Plane

8.25"

Primary Baffle Tube

Secondary Baffle

Field Stops

Primary Mirror (f/2.5)

Focal Plane

NOTE: Instructions for the use of optional accessories are not included in this manual. For details in this regard, see the Meade General Catalog.

The Meade Schmidt-Cassegrain Optical System (Diagram not to scale)

In the Schmidt-Cassegrain design of the Meade 8", 10", and 12" models, light enters from the right, passes through a thin lens with 2-sided aspheric correction (“correcting plate”), proceeds to a spherical primary mirror, and then to a convex aspheric secondary mirror. The convex secondary mirror multiplies the effective focal length of the primary mirror and results in a focus at the focal plane, with light passing through a central perforation in the primary mirror.

The 8", 10", and 12" models include oversize 8.25", 10.375" and 12.375" primary mirrors, respectively, yielding fully illuminated fieldsof-view significantly wider than is possible with standard-size primary mirrors. Note that light ray (2) in the figure would be lost entirely, except for the oversize primary. It is this phenomenon which results in Meade 8", 10", and 12" Schmidt-Cassegrains having off-axis field illuminations 10% greater, aperture-for-aperture, than other Schmidt-Cassegrains utilizing standard-size primary mirrors. The optical design of the 4" Model 2045D is almost identical but does not include an oversize primary, since the effect in this case is small.

LX200 Schmidt-Cassegrain telescopes now feature new baffle tube designs. These computer-optimized designs incorporate a series of 7 to 11 (depending on the focal ratio and size of the LX200) internal field-stops to eliminate almost all internal reflections, yielding the best image contrast available in any Schmidt-Cassegrain available today.

The Meade 7” Maksutov-Cassegrain Optical System (Diagram not to scale)

The Meade 7" Maksutov-Cassegrain design optimizes imaging performance by utilizing a combination of two-sided spherical meniscus lens multiplies the effective focal length of the primary by a factor of six, resulting in an overall f/15 system at the Cassegrain focus.

The oversize 8.25" primary mirror results in a fully-illuminated (unvignetted) field of view significantly wider than can be obtained with Maksutov optics incorporating primary mirrors of the same aperture as their meniscus correcting lenses. Computer-optimized primary and secondary mirror baffles, as well as a sequence of field stops internal to the primary mirror baffle, yield lunar, planetary, stellar,

(right), a strongly aspheric f/2.5 primary mirror, and a spherical secondary mirror. The convex secondary mirror

and deep-space images of uncommonly high contrast and resolution.

- 3 -

✵ WARNING! ✵

Never use the LX200 telescope to look at the Sun! Looking at or near the Sun will cause instant and irreversible damage to your eye. Eye damage is often painless, so there is no warning to the observer that damage has occurred until it is too late. Do not point the telescope or its viewfinder at or near the Sun. Do not look through the telescope or its viewfinder as it is moving. Children should always have adult supervision while observing.

18 2

Fig. 1: 8” LX200 Telescope.

1. Viewfinder Dew Shield

2. Viewfinder Collimation Screws

3. Declination (Dec) Setting Circle

4. Declination Pointer

5. Focus Knob

6. Eyepiece Holder

7. Right Ascension (R.A) Lock

8. Right Ascension Slow-Motion Controls

9. Right Ascension Vernier Pointer

Captions for Figure 1

10. Right Ascension Setting Circle

11. Power Panel

12. Keypad Hand Controller

13. Diagonal Mirror

14. Eyepiece

15. Bubble Level

16. Hour Angel (HA) Pointer

17. Drive Base

18. Viewfinder Focus Lock Ring

Contents

7" LX200 Maksutov-Cassegrain Telescope

8”, 10”, & 12" LX200 Schmidt-Cassegrain Telescope

- 4 -

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1. What is the LX200? An Overview . . . . . . . . . . . . . . . . 5

a. Heavy-Duty Mounts . . . . . . . . . . . . . . . . . . . . . . . . 5

b. Built-In 64,359 Object Library. . . . . . . . . . . . . . . . . 5

c. Altazimuth Mode Operation . . . . . . . . . . . . . . . . . . 5

d. Terrestrial Operation. . . . . . . . . . . . . . . . . . . . . . . . 5

e. Keypad and Power Panel Functions . . . . . . . . . . . 5

2. Standard Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1. What You Should Have . . . . . . . . . . . . . . . . . . . . . . . . 6

2. Please Look Everything Over. . . . . . . . . . . . . . . . . . . . 6

3. Inspecting the Optics . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4. Caution: All LX200 Owners . . . . . . . . . . . . . . . . . . . . . 6

5. Caution: 10” and 12” LX200 Owners . . . . . . . . . . . . . . 6

6. Keypad Version Number . . . . . . . . . . . . . . . . . . . . . . . 6

Telescope Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1. The Field Tripod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2. Mounting the Viewfinder. . . . . . . . . . . . . . . . . . . . . . . . 8

a. Attaching the Viewfinder. . . . . . . . . . . . . . . . . . . . . 8

b. Focusing the Viewfinder . . . . . . . . . . . . . . . . . . . . . 8

c. Collimating the Viewfinder . . . . . . . . . . . . . . . . . . . 8

3. Attaching the Diagonal Mirror and Eyepiece . . . . . . . . 8

4. Collimation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5. 12” Tube Swing-Through Limits . . . . . . . . . . . . . . . . . . 8

6. 7” Tube Swing-Through Limit . . . . . . . . . . . . . . . . . . . . 8

7. Maksutov Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1. Using the LX200 Manually . . . . . . . . . . . . . . . . . . . . . . 9

2. Using the LX200 in LAND . . . . . . . . . . . . . . . . . . . . . . 9

3. Using the LX200 in ALTAZ . . . . . . . . . . . . . . . . . . . . . 10

a. Entering Basic Information . . . . . . . . . . . . . . . . . . 10

b. Location of the Observing Site. . . . . . . . . . . . . . . 10

c. Local Time and Date . . . . . . . . . . . . . . . . . . . . . . 11

d. Setting Up the Telescope . . . . . . . . . . . . . . . . . . . 11

e. Using the MODE key . . . . . . . . . . . . . . . . . . . . . . 12

f. Library Object Keys . . . . . . . . . . . . . . . . . . . . . . . 13

4. Star Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

a. 1-Star with Known SITE. . . . . . . . . . . . . . . . . . . . 13

b. 2-Star with Known SITE. . . . . . . . . . . . . . . . . . . . 13

c. Unknown SITE . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

d. Which Alignment Method to Use . . . . . . . . . . . . . 13

The LX200 Keypad Hand Controller . . . . . . . . . . . . . . . . . . . 14

1. ENTER Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2. MODE Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3. GO TO Key. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4. Direction Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5. Speed Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6. RET Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

7. FOCUS Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

8. MAP Key. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

9. Object Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

10.PREV and NEXT Keys . . . . . . . . . . . . . . . . . . . . . . . . 15

The LX200 Power Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

1. ON/OFF Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2. N/S Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3. Ammeter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4. DEC Motor Connector . . . . . . . . . . . . . . . . . . . . . . . . 15

5. CCD Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6. Power 12vDC Connector . . . . . . . . . . . . . . . . . . . . . . 16

7. Keypad Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

8. Reticle Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

9. Focuser Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . 16

10.RS-232 Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

11.Aux Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Mode Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

1. Mode 1: Telescope/Object Library . . . . . . . . . . . . . . . 16

a. Telescope Menu File . . . . . . . . . . . . . . . . . . . . . . 16

b. Object Library Menu File . . . . . . . . . . . . . . . . . . . 20

2. Mode 2: Coordinates/GO TO . . . . . . . . . . . . . . . . . . . 22

a. Coordinates Menu File . . . . . . . . . . . . . . . . . . . . . 22

b. GO TO Menu Option . . . . . . . . . . . . . . . . . . . . . . 22

3. Mode 3: Clock/Calendar. . . . . . . . . . . . . . . . . . . . . . . 22

4. Mode 4: TIMER/FREQ . . . . . . . . . . . . . . . . . . . . . . . . 22

a. TIMER = Menu Option . . . . . . . . . . . . . . . . . . . . . 23

b. FREQ = Menu Option. . . . . . . . . . . . . . . . . . . . . . 22

5. Mode 5: Keypad Off/Brightness Adjust . . . . . . . . . . . 23

Magnification and Field of View . . . . . . . . . . . . . . . . . . . . . . . 24

1. Magnification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2. Apparent Field and Actual Field . . . . . . . . . . . . . . . . . 24

Appendix A: Equatorial Wedge. . . . . . . . . . . . . . . . . . . . . . . . 25

1. 8” Equatorial Wedge. . . . . . . . . . . . . . . . . . . . . . . . . . 25

a. Azimuth Control . . . . . . . . . . . . . . . . . . . . . . . . . . 25

b. Deluxe Latitude Adjuster . . . . . . . . . . . . . . . . . . . 25

2. Superwedge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3. Mounting the Telescope . . . . . . . . . . . . . . . . . . . . . . . 26

4. Magnetic Compass. . . . . . . . . . . . . . . . . . . . . . . . . . . 27

a. Setting Magnetic Declination . . . . . . . . . . . . . . . . 27

b. Compass Installation . . . . . . . . . . . . . . . . . . . . . . 27

c. Finding True North . . . . . . . . . . . . . . . . . . . . . . . . 28

Appendix B: Equatorial Use . . . . . . . . . . . . . . . . . . . . . . . . . . 29

1. Celestial Coordinates . . . . . . . . . . . . . . . . . . . . . . . . . 29

2. Lining Up with the Celestial Pole . . . . . . . . . . . . . . . . 29

3. Precise Polar Alignment . . . . . . . . . . . . . . . . . . . . . . . 30

Appendix C: Star Library and Star Charts . . . . . . . . . . . . . . . 31

1. Alignment Stars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

2. Star Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Appendix D: Object Library . . . . . . . . . . . . . . . . . . . . . . . . . . 34

1. The LX200 64,359 Object Library . . . . . . . . . . . . . . . 34

a. SAO Catalog. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

b. UGC Catalog . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

c. CNGC Catalog . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

d. IC Catalog. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

e. GCVS Catalog . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

f. Star Catalog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

g. M (Messier) Catalog . . . . . . . . . . . . . . . . . . . . . . . 35

h. Planet Catalog . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

2. CNGC Catalog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

3. STAR Catalog. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

4. M (Messier) Catalog . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Appendix E: Maintaining Your LX200. . . . . . . . . . . . . . . . . . . 51

1. Keeping Your Telescope Clean . . . . . . . . . . . . . . . . . . . . 51

2. Collimation of the Optical System . . . . . . . . . . . . . . . 52

3. Right Ascension Lock. . . . . . . . . . . . . . . . . . . . . . . . . 53

4. Behind the Power Panel. . . . . . . . . . . . . . . . . . . . . . . 53

5. Factory Servicing and Repairs . . . . . . . . . . . . . . . . . . 53

Appendix F: Personal Computer Control . . . . . . . . . . . . . . . . 54

1. The RS-232 Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

2. LX200 Test Program. . . . . . . . . . . . . . . . . . . . . . . . . . 54

3. LX200 Command Set . . . . . . . . . . . . . . . . . . . . . . . . . 55

a. Command Set Formats . . . . . . . . . . . . . . . . . . . . 55

b. General Telescope Information . . . . . . . . . . . . . . 55

c. Telescope Motion . . . . . . . . . . . . . . . . . . . . . . . . . 56

d. Home Position . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

e. Library/Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

f. Miscellaneous. . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

4. LX200 Demo Program . . . . . . . . . . . . . . . . . . . . . . . . 58

Appendix G: LX200 Specifications. . . . . . . . . . . . . . . . . . . . . 62

INTRODUCTION

As a new LX200 owner, you are preparing for a journey into the universe with the most advanced amateur telescope ever produced. The advent of this instrument is the culmination of twenty years of innovation and design at Meade Instruments; never before have the features you have in your hands been available to amateur astronomers: from robotic object location to the revolutionary Smart Drive and the most stable mounting structure ever. Your telescope comes to you ready for adventure; it will be your tour guide and traveling companion in a universe of planets, galaxies, and stars.

Meade 8", 10", and 12" LX200 Schmidt-Cassegrain and 7" Maksutov-Cassegrain telescopes are instruments of advanced mirror-lens design for astronomical and terrestrial applications. Optically and mechanically, the 7", 8", 10", and 12" telescope models are perhaps the most sophisticated and precisely manufactured telescopes ever made available to the serious amateur. These telescopes enable the visual astronomer to reach out for detailed observations of the Solar System (the planets: Jupiter, Saturn, Mars) and beyond to distant nebulae, star clusters, and galaxies. The astrophotographer will find a virtually limitless range of possibilities since, with the precision Meade worm-gear motor drive system, long exposure guided photography becomes not a distant goal, but an achievable reality. The capabilities of the instrument are essentially limited not by the telescope, but by the acquired skills of the observer and photographer.

The 7", 8", 10", and 12" LX200 are, with the exception of a few assembly operations and features, almost identical operationally. Most standard and optional accessories are interchangeable between the three telescopes. The instructions in this manual generally apply to all three telescopes; when exceptions to this rule occur, they are clearly pointed out.

Important Note: If you are anxious to use your Meade LX200 Telescope for the first time, at the very least be sure to read

TELESCOPE ASSEMBLY

sections of this manual. Thereafter, we urge you to read the balance of this manual thoroughly at your leisure, in order that you may fully enjoy the many features offered by the instrument.

(page 7), and

QUICK START

(page9)

1. What Is the LX200? An Overview

Meade LX200 SCT’s mark a new era in telescope technology for the amateur astronomer, whether beginner or seasoned veteran. For the beginner LX200 electronics permit the location and observation of the major planets as well as hundreds of deep-sky objects the very first night you use the telescope. For the experienced amateur the telescopes’ pushbutton electric slewing, digital readouts, Smart Drive, and much more open up visual and photographic capabilities heretofore undreamed of.

a. Heavy-Duty Mounts

with 9-speed Dual-Axis Electronics

DC-servo-motor-controlled worm gear drives on both telescope axes permit observatory-level precision in tracking, guiding, and slewing. The 9-speed dual-axis drives cover every possible contingency of telescope positioning: Press the SLEW button on the keypad controller for rapid motion of the telescope across the skies at up to 8 degrees per sec. (6 degrees per sec. for the 12" LX200) on both axes simultaneously; once near the target, switch instantly to the FIND speed for centering in the viewfinder at 2 degrees per sec. Observing the object in the main telescope, use the CNTR speed (32x sidereal) to place the object in the center of the field. During long-exposure astrophotography press the GUIDE button for precise corrections at 2x sidereal speed.

b. Built-in 64,359-Object Library

Enter into the keypad any of the 110 Messier objects, 7,840 of the finest NGC objects (galaxies, diffuse or planetary nebulae, star clusters), one of the 8 major planets from Mercury to Pluto,

- 5 one of 351 alignment stars or any one of 56,050 SAO, UGC, IC

or GCVS objects, press GO TO, and the telescope automatically slews, or moves, to the object at up to 8° per sec., centering it in the main telescope field.

c. Altazimuth Mode Operation

For all visual observing applications, and for lunar and planetary photography, Meade LX200’s may be set up in the Altazimuth mode. Just attach the telescope’s drive base directly to the tripod, use the fast 1-star alignment procedure, and the telescope’s computer actuates 2-axis tracking that keeps objects precisely centered in the field, even at high powers, during the entire observing session.

d. Terrestrial Operation

Meade LX200’s make incredible land-view telescopes. Set the telescope up in the Altazimuth format, activate the Land menu option on the telescope’s computer, and use the keypad to track land objects on both axes at any of the same 4 drive speeds!

e. Keypad and Power Panel Functions

The multifunction capability of LX200’s includes direct connection of popular CCD autoguider/imagers; RS- 232 serial interface with a personal computer (PC), allowing the user to perform all of the keypad functions through, or write custom telescope software for a PC; brightness level control of an illuminated reticle eyepiece from the keypad and including special pulse-mode reticle operation.

2. Standard Equipment

a. 7" Model LX200

lncludes 7" Maksutov-Cassegrain optical tube assembly with EMC super multi-coatings (D = 178mm, F = 2670mm-f/15); heavy-duty fork mount, with 4"-dia. sealed polar ball bearing, quartz-microprocessor-controlled 5.75" worm gears on both axes; setting circles in RA and Dec; handheld keypad Electronic Command Center with digital readout display, permanently-programmable Smart Drive, 9speed drive control on both axes, GO TO controller, HighPrecision Pointing, and 64,340-object onboard celestial software library; internal tube-cooling fan for rapid image stabilization; 25 ft. power cord and adapter for telescope operation from 115v.AC; 8 x 50mm viewfinder; eyepiece-holder and diagonal prism (1.25"); Series 4000 SP26mm eyepiece; variable-height field tripod; operating instructions.

b. 8" Model LX200

lncludes 8" Schmidt-Cassegrain optical tube assembly with EMC super multi-coatings (D = 203mm, F = 1280mm-f/6.3 or 2000mm-f/10); heavy-duty fork mount, with 4"-dia. sealed polar ball bearing, quartz-microprocessor-controlled 5.75" worm gears on both axes, and multi-function power panel display on the drive base; manual and electric slow-motion controls on both axes; setting circles in RA and Dec; handheld keypad Electronic Command Center with digital readout display, PPEC Smart Drive, 9-speed drive control on both axes, GO TO controller, High-Precision Pointing, and 64,340-object onboard celestial software library; 25 ft. power cord and adapter for telescope operation from 115v.AC; 8 x 50mm viewfinder; eyepiece-holder and diagonal prism (1.25"); Series 4000 SP26mm eyepiece; variable-height field tripod; operating instructions.

c. 10" Model LX200

lncludes 10" Schmidt-Cassegrain optical tube assembly with EMC super multi-coatings (D = 254mm, F = 1600mm-f/6.3 or 2500mm-f/10); heavy-duty fork mount, with 4"-dia. sealed polar ball bearing, quartz-microprocessor-controlled 5.75" worm gears on both axes, and multi-function power panel display on the drive base; manual and electric slow-motion controls on both axes; setting circles in RA and Dec; handheld keypad Electronic Command Center with digital readout display, PPEC Smart Drive, 9-speed drive control on both axes, GO TO controller, High-Precision Pointing, and 64,340-object onboard

celestial software library; 25 ft. power cord and adapter for telescope operation from 115v.AC; 8 x 50mm viewfinder; eyepiece-holder and diagonal prism (1.25"); Series 4000 SP26mm eyepiece; variable-height field tripod; operating instructions.

d. 12" Model LX200

lncludes 12" Schmidt-Cassegrain optical tube assembly with EMC super multi-coatings (D = 305mm, F = 3048mm-f/10); heavy-duty fork mount, with 4"-dia. sealed polar ball bearing, quartz-microprocessor-controlled 5.75" worm gears on both axes, and multi-function power panel display on the drive base; manual and electric slow-motion controls on both axes; setting circles in RA and Dec; handheld keypad Electronic Command Center with digital readout display, PPEC Smart Drive, 7-speed drive control on both axes, GO TO controller, High-Precision Pointing, and 64,340-object onboard celestial software library; 25 ft. power cord and adapter for telescope operation from 115v.AC; 8 x 50mm viewfinder; 2" diagonal mirror with 1.25" adapter; Series 4000 SP26mm eyepiece; giant field tripod; foam-fitted carrying case; operating instructions.

UNPACKING AND INSPECTION

As you begin to unpack your telescope from its cartons, you will probably be interested in setting it up right away; we certainly understand your excitement but please take a few minutes to read this page before doing so. You should verify that you have all the proper equipment, and that it has arrived to you undamaged.

We strongly recommend that you keep your original packing materials. If it should ever become necessary for you to return your telescope to the Meade factory for servicing, these will help ensure that no shipping damage will occur.

Meade LX200 telescopes supplied to countries outside the U.S.A. are identical to those offered domestically, with the exception of the AC wall adapter.

1. What You Should Have

Carefully unpack and remove all the telescope parts from their packing material. Compare each part to the Standard Equipment. You may wish to place a check next to each item as you identify it. These Packing Programs represent the original specifications for this instrument. Each telescope has been inspected twice at the factory to confirm the inclusion of every item.

2. Please Look Everything Over

Meade Instruments and your shipper have taken precautions to ensure that no shipping damage will occur, but if your shipment has suffered severe vibration or impact damage (whether or not the shipping cartons show damage) then it is important that you retain all the original packing and contact the shipper to arrange a formal inspection of the package or packages. This procedure is required prior to any warranty servicing by Meade Instruments.

3. Inspecting the Optics

Note on the “Flashlight” Test: If a flashlight or other high-

intensity light source is pointed down the main telescope tube, you may at first be shocked at the appearance of the optics. To the uninitiated, the view (depending on your line of sight and the angle the light is coming from) may reveal what would appear to be scratches, dark or bright spots, or just generally uneven coatings, giving the appearance of poor surface quality. These effects are only seen when a high intensity light is transmitted through lenses or reflected off the mirrors, and can be seen on any high quality optical system, including the giant research telescopes in use today. It should be pointed out, however, that optical quality cannot be judged by this grossly misleading “test”, but through careful star testing. The Flashlight Test causes even the very best optics to look “terrible”.

- 6 As the high intensity light passes through the Schmidt corrector

plate, most of it is transmitted through (about 98%+) while the rest of the light scatters through the glass. As the light hits the mirrored surfaces, most of it is reflected back (about 94%) while the rest of it scatters across the coatings. The total amount of scattered light will be significant, and its effects allow you to see microscopic details that are normally invisible to the unaided eye. These anomalous details are real, but their combined effects will in no way impose limits on the optical performance, even under the most demanding observing or imaging criteria.

4. Caution: All LX200 Owners

CAUTION: Serious damage to the drive gears may result from shock in handling, while transporting or commercially shipping the LX200, should the R.A. lock (7, Fig. 1), and/or the Dec. lock (2, Fig. 4) be left engaged. Always release the locks when storing in the case, or when crating for commercial shipment to allow the telescope to give, if the case or crate is sharply jarred or dropped.

Also, the optical and mechanical axes of all LX200 telescopes have been carefully aligned at the factory to ensure accurate object pointing. Do not loosen or remove the fork arms or optical tube assembly from the drive base; the resulting misalignment of the axes will result in inaccurate slewing of the telescope in the GO TO mode.

5. Caution: 10" and 12" LX200 Owners

CAUTION: Do not attempt to turn the focuser knob of the optical tube until you have read this note!

NOTE: Next to the base of the focuser you will see a redcolored slotted head bolt. This bolt is used only for safety in shipment. Remove this bolt before attempting to turn the focuser knob. In its place, insert the rubber plug provided as a dust protector (this rubber plug is included with your hardware package).

Your focuser is now operational.

WARNING: The 10" and 12" LX200 should never be commercially shipped without this red-colored bolt in place. This is essential during commercial transport where rough handling may occur. For your personal transport and storage, you will never have to use this bolt again.

a. Commercial Reshipment

To commercially re-ship the telescope, be sure to follow this procedure:

1. Turn the focuser knob clockwise until it stops. This will

bring the primary mirror all the way back in the tube.

2. Remove the rubber plug and insert the red-headed bolt.

Thread it in to a firm snug feel. Do not overtighten. (If you have misplaced the red-headed bolt, you may use any other bolt that is 1/4-20x1" long.

3. When packaging the 10" or 12" LX200, be sure to release

the R.A. lock (7, Fig. 1), and Dec. lock (2, Fig. 4), to prevent shock to the gears in the motor assemblies should the package suffer severe handling.

Please note that commercial shipment of the 10" and 12" LX200 Telescope without the safety bolt in place and packed in the original factory supplied shipping containers as described above is done at the owner’s risk and your warranty may be voided if shipping damage results.

6. Keypad Version Number

The current keypad version is 3.20 (see sticker on back of keypad). This does not indicate the telescope software version—which is displayed on the keypad LED at power-up.

TELESCOPE ASSEMBLY

Use the following steps to assemble your telescope.

NOTE: If the section is not applicable to all LX200 models, it is noted at the beginning of each section.

1. The Field Tripod

The field tripods (Figs. 2 and 3) for Meade 8", 10", and 12" LX200 telescopes are supplied as completely assembled units, except for the spreader bar (4, Fig. 2) and the 6 lock knobs (2 knobs for each of the 3 tripod legs) used to adjust the height of the tripod. These knobs are packed separately for safety in shipment.

For visual (i.e., non-photographic) observations, the drive base (17, Fig. 1) of the telescope’s fork mount is attached directly to the field tripod. The telescope in this way is mounted in an “Altazimuth” (“Altitude-Azimuth,” or “vertical-horizontal”) format. The telescope in this configuration moves along vertical and horizontal axes, corresponding respectively to the Declination and Right Ascension axes (explained later in this manual) in an astronomical observing mode.

Fig. 2: LX200 Field Tripod. (1) Tripod Head; (2) Threaded Rod; (3) Tension Knob; (4) Spreader Bar; (5) Lock Knobs; (6) Extension Strut; (7) Tension Hub.

“C” Clip

- 7 Alternately, the field tripod can be used in conjunction with the

appropriate optional equatorial wedge ( for long exposure astrophotography. The equatorial wedge permits alignment of the telescope’s Polar Axis with the Celestial Pole (or North Star).

After removing the field tripod from its shipping carton, stand the tripod vertically, with the tripod feet down and with the tripod still fully collapsed (see Fig. 3). Grasp two of the tripod legs and, with the full weight of the tripod on the third leg, gently pull the legs apart to a fully open position.

Thread in the 6 lock-knobs (2 on each tripod leg) near the foot of each tripod leg (Fig. 2). These lock-knobs are used to fix the height of the inner, extendible tripod leg sections.

NOTE: “Firm feel” tightening is sufficient; over-tightening may result in stripping of the knob threads or damage to the tripod legs and results in no additional strength.

The spreader bar (4, Fig. 2) has been removed for shipment. To replace, first remove the threaded rod (2, Fig.2) from the tripod head (1, Fig. 2); a small piece of plastic holds the threaded rod in place. Remove the small plastic bag that is stapled to the threaded rod. This bag contains the “C” clip retainer (used below) and an extra clip.

Slide the spreader bar onto the threaded rod (note the correct orientation as shown in Fig. 2) and position the threaded rod back through the tripod head. Place the clip retainer ( a “C” clip) into the slot in the threaded rod. This clip holds the threaded rod in place. See Fig. 3.

Position the spreader bar so that the 3 arms of the spreader bar are lined up with the 3 tripod legs.

Place the entire telescope onto the top of the tripod head, and thread the threaded rod into the central threaded hole in the bottom of the drive base of the telescope. Tighten the tension knob (3, Fig. 2); firm tightening of the tension knob is sufficient to result in rigid positioning of the tripod legs.

To vary the tripod height, loosen the 6 lock-knobs, slide the 3 inner tripod leg sections out to the desired height, and firmly retighten (but do not overtighten) the 6 lock-knobs.

To collapse the tripod (after removing the telescope and equatorial wedge, if applicable) for storage follow these steps:

• Rotate the spreader bar 60° from its assembled position,

so that one spreader bar arm is located between each adjacent pair of tripod legs.

• At the base of the tripod is a 3-vane extension strut

system, with a circular hub at its center (7, Fig. 2). Grasp the tripod head (1, Fig. 2) with one hand and, with the other hand, pull directly “up” on the central hub of the extension strut system. This operation will cause the tripod legs to move inward to a collapsed position.

APPENDIX A

, page 25)

Fig. 3: Field Tripod (collapsed).

PRECAUTIONARY NOTES

• If the tripod does not seem to extend or collapse easily, do not force the tripod legs in or out. By following the instructions above, the tripod will function properly, but if you are unclear on the proper procedure, forcing the tripod into an incorrect position may damage the extension strut system.

• Do not overtighten the 6 lock-knobs used to fix the inner tripod leg sections at various heights. “Firm feel” tightening is sufficient.

• Be sure the spreader bar (4, Fig. 2) is not upside-down on the threaded rod.

2. Mounting the Viewfinder

Each 7", 8", 10", and 12" LX200 telescope is supplied as standard equipment with an 8x50mm straight-through viewfinder. The bracket for this viewfinder is packed separately from the finder itself, and 6 black nylon thumbscrews for collimation are pre-threaded into the viewfinder bracket. The viewfinder bracket mounts onto the telescope with a quickrelease mount. See Fig. 1.

a. Attaching the Viewfinder

The viewfinder is shipped separately from the bracket and must be installed into the bracket. Slide the viewfinder into the bracket and lightly tighten the 6 collimation (alignment) screws (2, Fig. 1).

The quick-release mount allows the viewfinder to be easily attached or removed from the telescope. To attach the unit, simply slide the viewfinder with bracket into the mating base on the telescope and tighten the two thumbscrews.

b. Focusing the Viewfinder

The viewfinder has been pre-focused at the factory. However, should it become necessary to adjust the focus, follow these steps:

1. Loosen the focus lock ring (18, Fig. 1).

2. While looking at a star, rotate the Dew Shield (1, Fig. 1) until the star is in focus. (This refocuses the objective lens.)

CAUTION:Take care when rotating counter clockwise. You are unthreading the dew shield and it may fall off if rotated too far. Refocusing the objective lens will only require a few turns of the Dew Shield at most.

3. When the Dew Shield is rotated to the sharpest focus for your eye, tighten the focus lock ring against the Dew Shield to fix its position.

c. Collimating the Viewfinder

The viewfinder will require alignment, or collimation, with the main telescope. Using the 26mm eyepiece, point the main telescope at some easy to find land object (e.g., the top of a telephone pole or corner of a building) at least 200 yards distant. Center a well-defined object in the main telescope. Then, simply turn the 6 nylon collimation thumbscrews (2, Fig. 1) until the crosshairs of the viewfinder are precisely centered on the object already centered in the main telescope. With this collimation accomplished, objects located first in the wide-field viewfinder will then be centered in the main telescope’s field of view.

Attaching the Diagonal Mirror and Eyepiece

The eyepiece holder (6, Fig. 1) threads directly onto the rearcell thread of the 8" and 10" telescopes. The diagonal prism (13, Fig. 1) slides into the eyepiece holder of the 7", 8" and 10" telescopes, while the 2" diagonal mirror threads directly into the rear-cell thread of the 12" telescope. In turn, both the diagonal prism and diagonal mirror accept the supplied 1-1/4" O.D. eyepiece.

For astronomical observations, the diagonal prism or mirror generally provides a more comfortable right-angle viewing position. Alternately, in the 8" and 10" telescopes, an eyepiece may be inserted directly into the eyepiece holder for straightthrough observations, the 12" telescope requires the accessory eyepiece holder. Note in this case, however, that the image will appear inverted and reversed left-for-right. With the diagonal prism and mirror, telescopic images appear correctly oriented up-and-down, but still reversed left-for-right. For terrestrial applications, where a fully corrected image orientation is desired, both up-and-down and left-for-right, the optional #924 Erecting Prism* or #928 45° Erect-Image Diagonal Prism should be ordered separately. Eyepieces and the diagonal prism are held in their respective places on the telescope by a moderate tightening of the thumbscrews on the diagonal prism and eyepiece holder.

- 8 -

4. Checking the Collimation of the Optics

The optical systems of all Meade Schmidt-Cassegrains are precisely collimated, or aligned, before leaving the factory. However, if the telescope has received a severe jolt in shipment the optics can become de-collimated, a situation which may result in serious image degradation. Recollimating the optics is, however, a simple procedure which is easily performed by the telescope user. We urge all LX200 owners to confirm the collimation of their telescope, and to recollimate the optics if necessary. For details in this regard, see page 82.

NOTE: There is no collimation procedure required for the Meade 7" Maksutov-Cassegrain telescope. Factory alignment assures optimal viewing accuracies.

5. 12" Tube Swing-Through Limit

The length of the 12" LX200 optical tube prohibits the correcting plate end of the tube from swinging through the fork arms — the tube will hit the mount. When the telescope is aligned, the software will stop the telescope from moving into the mount. If the telescope is not aligned, there are also mechanical stops.

When in LAND or ALTAZ modes, this limit does not restrict any sections of the sky, since the limit is set at 45° from straight down. When in the POLAR mode, some parts of the sky might be restricted, depending on the latitude of the observing site.

Observing sites with latitudes higher than 45° will not have any restrictions. Latitudes below 45° will have the southern horizon restricted somewhat. To determine the amount of sky not available, subtract the latitude of the observing site from 45. This will give the number of degrees of southern horizon that the 12" LX200 will not move to. For example, if the latitude of the observing site is 35°, then 10° (45-35) of southern sky is unavailable for observations.

6. 7" Tube Swing-Through Limit

The length of the 7" LX200 optical tube prohibits the correcting plate end of the tube from swinging through the fork arms — the tube will hit the mount. When the telescope is aligned, the software will stop the telescope from moving into the mount. If the telescope is not aligned, there are also mechanical stops and some parts of the sky might be restricted if using a wedge, depending on the latitude of the observing site.

Observing sites with latitudes higher than 45° will not have any restrictions. Latitudes below 45° will have the southern horizon somewhat restricted when using a wedge and polar aligning. To determine the amount of sky not available, subtract the latitude of the observing site from 45, this will give the number of degrees of the southern horizon that the 7" LX50 will not reach. For example, if the latitude of the observing site is 35°, then 10° (45 – 35) of southern sky is unavailable for observations. No restrictions of observable sky occur in the altaz mode of alignment and operation.

7. Maksutov Fan

The Maksutov optics are equipped with a fan which will assist in the stabilization of the temperature of these optics. The fan will operate when a special power cord (supplied in the accessory box) is plugged into the fan and the LX50 panel plug marked “Aux” with the power switch in the “ON” position. The amount of time required to stabilize the temperature will be dependent upon ambient conditions including the observation site and preexisting condition of the telescope. The fan should be activated at the beginning of the observation session to accelerate the temperature stabilization. As soon as the optics have reached an equilibrium with the environment the fan should be turned off by unplugging the fan power cord. Fan operation time should range between 5 and 25 minutes. While it is permissible to run the fan continuously it is not recommended because the very slight vibration of the fan may cause noticeable movement of the objects observed in the sensitive optics.

QUICK START

To utilize all the features of the telescope, it is necessary to enter some information into the telescope’s computer memory, and learn the menu structure of the keypad hand controller, which is described in the rest of this manual. As advanced as LX200 electronics are, the telescope is very straightforward to operate — even if you have no experience whatsoever in using a personal computer.

If you are reading this manual for the first time and are anxious to “look through the telescope”, this section will describe how to use the telescope without going through the rest of the manual. But be sure to come back and read the details, for most of the telescope’s features can not be accessed without a full knowledge of these details.

1. Using the LX200 Manually

The easiest way to use the telescope is to simply operate it manually. With the telescope mounted on the field tripod (see The Field Tripod, page 7), and with the diagonal prism and eyepiece in place, you are ready to make observations through the telescope. Even without the viewfinder (if not yet installed), terrestrial objects will be fairly easy to locate and center in the telescope’s field of view with a low power eyepiece, simply by “gun sighting” along the side of the main telescope tube.

By unlocking the R.A. lock (7, Fig. 1), the telescope may be turned rapidly through wide angles in Right Ascension (R.A.). The reason for the terminology Right Ascension and its complementary term, Declination will be made clear later in this manual. For now, Right Ascension simply means “horizontal” and Declination means “vertical”. Fine adjustments in R.A. are made by turning the R.A. slow-motion control knob (8, Fig. 1), while the R.A. lock is in the “unlocked” position.

CAUTION: Do not attempt to move the telescope manually in a horizontal direction when the R.A. lock is in the “locked” position.

The R.A. slow-motion control knob may be turned, if desired, with the R.A. lock in a “partially locked” position. In this way, a comfortable “drag” in R.A. is created. But do not attempt to operate the R.A. slow-motion control knob with the telescope fully locked in R.A., as such operation may result in damage to the internal gear system.

Releasing the Declination lock knob (2, Fig. 4), permits sweeping the telescope rapidly through wide angles in Declination.

Fig. 4: LX200 Declination (Vertical) System. (1) Manual Slow-Motion Control Knob; (2) Declination Lock Knob; (3) Declination Worm Gear Cover.

- 9 To use the Declination fine-adjust, or manual slow-motion knob,

lock the telescope in Declination using the Declination lock knob (2, Fig. 4), and turn the Declination slow-motion knob (1, Fig. 4).

With the above mechanical operations in mind, select an easy to find terrestrial object as your first telescope subject — for example, a house or building perhaps one-half mile distant.

Unlock the Declination lock knob (2, Fig. 4), and R.A. lock (7, Fig. 1), center the object in the telescopic field of view and then re-lock the Dec. and R.A. locks. Precise image centering is accomplished by using the Dec. and R.A. slow-motion controls.

The focus knob (5, Fig. 1) is located at the “4 o’clock” position as you face the rear cell of the telescope. Focusing is accomplished internally by a precise motion of the telescope primary mirror so that, as you turn the focus knob, there are no externally moving parts. You will find that if you turn the focus knob counter-clockwise you are focusing towards the infinity setting, and turning clockwise is for close distance. There are about 45 complete turns to go from one end of focus to the other, and it is possible to focus past infinity. Be patient during focusing as images quickly go in and out of focus with only a slight amount of turning of the focus knob.

2. Using the LX200 In LAND

The 7", 8", 10", and 12" LX200 telescopes are shipped with the microprocessor set to LAND, the align menu option you will wish to use to view terrestrial objects. In this menu option 4 different motion speeds are active, allowing the telescope to be moved electronically by means of the keypad. To use the telescope in Land, follow these steps.

a. Loosen the Dec. lock knob (2, Fig. 4) and position the

optical tube approximately level, so that the Dec. setting circle (3, Fig. 1) reads 0°. Retighten the Dec. lock knob.

b. Loosen the R.A. lock (7, Fig. 1) and rotate the telescope

so that the R.A. pointer (9, Fig. 1) and the HA pointer (16, Fig. 1) are approximately in line with each other. This will position the fork arms so that they are parallel to the power panel (11, Fig. 1). Tighten the R.A. lock

The above two steps are not necessary for the telescope to work, so don’t worry about having to get it exactly right. The telescope has some “illegal” positions, places where the telescope will not go and these two steps insure proper operation.

c. After setting up the telescope, plug in both coil cords with

the keypad, one of the supplied power sources, either the AC Wall Adapter Power Converter (for AC current wall outlets), or the optional DC Cigarette Lighter Power Cord (used in an automobiles cigarette lighter outlet, with the ignition turned on only to allow the electric power on from the car battery).

d. Turn on the power switch on the power panel of the

LX200. The keypad display (1, Fig. 5) will show “MEADE” for several seconds as the microprocessor does a selfdiagnostic test. When the self-diagnostic test is complete, the display will show “TELESCOPE” on the top line, “OBJECT LIBRARY” on the lower line, and the red LED light next to the “SLEW” button will light up.

e. At this point, the LX200 is ready to use. Select the speed

at which you want to move the telescope by pressing the appropriate Speed Selection Key (4, Fig 5). Note that you will be able to “see” the telescope move only in the SLEW and FIND modes; CNTR (center) and GUIDE motions can only be seen while looking through the telescope. The red LED next to that key (3, Fig. 5) will light, indicating the speed selected. Then press one of the four direction keys (2, Fig. 5) to move the telescope in that direction at the selected speed.

Fig. 5: Keypad Hand Controller. (1) Display); (2) Direction Keys; (3) Speed Indicator LEDs; (4) Speed Selection Keys.

Motion Speeds

SLEW (7) = 8°/sec (8”, 10”); 6°/sec (12”) FIND (4) = 2°/sec CNTR (1) = 480 arcsec/sec GUIDE (0) = 30 arcsec/sec

The LX200 can also be moved manually with the R.A. and Dec. locks released, or as described above only. The Declination manual slow-motion knob (1, Fig.4) is non-functional when power is supplied to the telescope. When the power is “on”, only use the N, S, E, and W keys on the keypad hand controller. Serious damage can occur to the internal gears of the motor assembly if the Declination manual slow-motion knob is turned even a slight amount by hand.

3. Using the LX200 In ALTAZ (Altazimuth )

The two quick start methods described above allow you to use the telescope, but do not make use of any of the computer features available, including finding objects from the Object Library and automatic tracking of stars. In order for these features to work, the telescope’s power needs to 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” many times.

This section will explain what keys to push to get the minimum data required into the computer, without any detailed explanation (see instructions). The steps detailed here only take a few minutes and allow you to begin making use of all the LX200 features.

MODE FUNCTIONS

, page 16, for detailed

a. Entering Basic Information

In order for the LX200 to make the conversions between the stellar coordinate system (R.A. and Declination) and the Altazimuth coordinate system (altitude and azimuth), it needs to know three pieces of information. This information only needs to be entered one time — the LX200 remembers data even when the power is off. Note, however, that the time should be checked and reset, if necessary, on each observing session.

b. 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

- 10 -

Method to Use?, 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 1 or

2 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 the above information is determined, it can be entered into the telescope. It is easiest to enter the data with the telescope sitting on a table indoors—do not try to do it outside at night.

Each step below is given without any details or explanations to keep the process as simple and fast as possible. Next to each step will also be 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,” simply turn off the telescope and restart this procedure.

1. Turn the telescope power on. After a few seconds (after the self-diagnostic test is complete), the display will look like Display 1.

2. Press the ENTER key. This selects the TELESCOPE functions. The display should now look like Display 2.

page 13). Follow steps 4 through 8 in Setting

Display 1

Display 2

→TELESCOPE

OBJECT LIBRARY

→1) SITE

2) ALIGN

3. Press the ENTER key. This selects the SITE functions. The display should look like Display 3.

Display 3

→1) A A A ✔

2) A AA

4. 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

5. Press the ENTER key. The display should now look like Display 5.

Display 5

6. Use the number keys to enter your latitude. The underline designates the current cursor position. Mistakes can be corrected by moving back (using the “E” and “W” keys). A negative latitude can be entered by positioning the cursor under the “+” and hitting the “NEXT” key (lower right-hand key). When the latitude is correct, press ENTER. The display will look like Display 6.

Display 6

→1) A A A ✔

2) A AA

→LAT = +00° 00’

LONG = 000° 00’

→LAT = +33° 35’

LONG = 000° 00’

7. Use the number keys to enter your Longitude as above. When complete, the display will look like Display 7.

Display 7

→LAT = +33° 35’

LONG = 117° 42’

8. Press ENTER to complete the site information input. The display will go back to Display 3.

9. Press MODE to go back to Display 2.

10. Press MODE again to go back to Display 1.

It is important to note that the longitude standard used in the LX200 starts at 0 degrees in Greenwich U.K. and increases Westerly only to 359 degrees 59 minutes. Many maps will show Easterly longitudes which cannot be entered into the keypad display. As an example, if your map indicates that you are at an Easterly longitude of 18 degrees 27 minutes, then you would enter 341 degrees 33 minutes.

Do not concern yourself with differences in longitude and latitude as they pertain to different map spheroid projections, those minor differences are too small to adversely affect the longitude and latitude data input.

c. Local Time and Date.

NOTE: The Time function on the 16” LX200 telescope is a standard quartz clock. Like nearly any timepiece, the internal clock of the telescope should be periodically checked and updated to keep it as accurate as possible.

The local time should be set as accurately as possible, using the 24 hour format. The local time and date are used to determine sidereal time (star time) and the pointing accuracy of the telescope will depend on the accuracy of the time entered. Choose a reliable source as a reference for accurate time such as your local airport, or telephone company. In the U.S.A. you can double check the accuracy of the exact minutes by dialing WWV for the universal coordinated time at (303) 499-7111 (be sure to enter your local time hour information, not the U.T. hour). For the example, we will use 2:40:00 P.M. on August 5,

1998.

1. The display should look like Display 1. If it does not, press

the MODE key until it does.

2. Press the MODE key twice. The display will look like

Display 8, but with a random LOCAL and SIDE times.

Display 8

3. Press and HOLD the ENTER key until the keypad hand

controller beeps (display like Display 9).

Display 9

4. Using the number keys, enter the current local time to

within 5 seconds. (Remember, 2:40:00 P.M. is 14:40:00 in the 24 hour format.) Corrections can be made by moving the flashing cursor using the W and E keys. The display should look like Display 10. (NOTE: The time should be checked and reset about once a month.)

Display 10

→LOCAL = 11:24:30

SIDE = 21:38:02

→LOCAL = 11:24:30

SIDE = 21:38:02

→LOCAL = 14:40:00

SIDE = 21:38:02

5. Press the ENTER key when the time is correct. The

display will change to Display 11.

Display 11

Hours from GMT:

+ 0 8

The next step is to enter the Greenwich Mean Time (GMT) time zone shift (This procedure is a lot easier than it sounds). Simply look up your time zone in the table below to find the GMT time zone shift.

- 11 -

U.S.A.TIME ZONES

TIME STANDARD DAYLIGHT ZONE TIME TIME

HAWAII PACIFIC +8 Hours +7 Hours MOUNTAIN +7 Hours +6 Hours CENTRAL +6 Hours +5 Hours EASTERN +5 Hours + 4 Hours ATLANTIC +4 Hours +3 Hours

For example: You live in the Pacific Time Zone and you are on Daylight Time. The GMT time shift is +7 hours.

6. Use the number keys to enter the GMT time zone shift determined from the table above. Press ENTER when done; the display will go back to Display 8. If you are using the LX200 East of Greenwich U.K., then you must enter a

- (minus) GMT time zone shift by moving the blinking cursor backwards in the display with the W key and then pressing the NEXT key. The + (plus) sign will change to (minus). Use the number keys to enter the Westerly (+) GMT time zone shift determined from the table above or your calculated Easterly (-) time zone shift.

7. Press the ENTER key. This will select the DATE display (Display 12), with a random date showing.

Display 12

8. Press and Hold the ENTER key until the keypad hand controller beeps. The display will look like Display 13, with the blinking cursor over the first number.

Display 13

9. Use the number keys to enter the current date. The display should look like Display 14. Use the W and E keys to move the blinking cursor left and right to correct any mistakes.

Display 14

10. Press the ENTER key when the date is correct.

After you press the ENTER key, the keypad hand controller will display “Updating planetary data.” The position of the planets depends on the date, so anytime the date is changed, the planet positions are recalculated.

This is all the information the LX200 needs to make use of all features. The next steps actually align the telescope with the night sky.

+10 Hours +9 Hours

DATE = 07/11/91

DATE = 08/05/98

d. Setting Up the Telescope

After the basic information has been entered into the telescope, the telescope is ready to actually set-up and use. Follow

TELESCOPE ASSEMBLY

outside, and follow these steps:

1. Using the Bubble Level (14, Fig. 1) located on the telescope’s drive base, level the telescope. This is a very important step because the telescope’s pointing ability depends on the telescope being level. Make sure the bubble is precisely centered by adjusting the height of the three tripod legs.

2. Loosen the Dec. lock knob (18, Fig. 1) and position the optical tube assembly approximately level (so that the Dec. Circle (3, Fig. 1) reads 0°. Retighten the Dec. lock knob.

(page 6) to set-up the telescope

3. Loosen the R.A. lock (7, Fig. 1) and rotate the telescope so that the R.A. pointer (9, Fig. 1) and the HA pointer (16, Fig. 1) are approximately in line with each other. This will position the fork arms so that they are parallel to the power panel (11, Fig. 1). lock the R.A. lock.

Steps 2 and 3 are not required for the telescope to work, so don’t worry about getting it exactly right. The telescope has some “illegal” positions (places where the telescope will not go) and these two steps insure proper operation.

4. Turn the telescope on. After a few seconds (after the self-

diagnostic test is complete), the display will look like Display 15.

Display 15

5. Press the ENTER key. This selects the TELESCOPE

functions. The display should look like Display 16.

Display 16

6. Press the NEXT key. This will move the arrow to the

lower line (see Display 17).

Display 17

7. Press the ENTER key to select the ALIGN function. The

display will look like Display 18. (If the display looks like Display 19 — with a checkmark already next to ALTAZ, go to step 9.)

Display 18

8. Press the ENTER key to activate the ALTAZ mode. The

keypad hand controller will beep and display a checkmark next to the ALTAZ (see Display 19).

Display 19

→TELESCOPE

OBJECT LIBRARY

→1) SITE

2) ALIGN

1) SITE

→2) ALIGN

→1) ALTAZ

2) POLAR

→1) ALTAZ ✔

2) POLAR

9. Press the ENTER key to use the checked mode (ALTAZ).

The keypad hand controller display will look like Display

20.

Display 20

10. Press “1” to select “Star.” The display screen will now

look like Display 21.

Display 21

11. If you have not already leveled the telescope, do so now.

When the telescope is level, press ENTER. The display will look like Display 22.

Display 22

12. This message simply reminds you what you should do

next. Press ENTER to show a display like Display 23.

Display 23

13. Using the monthly star charts (

an alignment star. Look at the chart for the current month and face the direction indicated. The constellations shown are easily found — even in the city. The charts are approximately 90 degrees wide, with the top of the chart indicating straight up. If the time is after 9:00 PM, then

1 Star or

2 Star Alignment

Level base, then

press ENTER

Press ENTER, then

pick align star

→ACHERNAR

ACRUX A

APPENDIX B

, page 29) pick

- 12 use the next month’s chart. Once you identify the

constellation, pick any of the labeled stars that is not within a 10 degree radius of overhead, but do not choose Polaris, for reasons made clear below. Polaris is also known as the North Star, and is shown for reference only.

When aligning in ALTAZ, overhead stars can confuse the LX200 because of an illegal position that prevents the optical tube assembly from slewing past 90 degrees altitude to protect the viewfinder from hitting the fork arm. The LX200 will track an overhead object, but it does so by moving higher in altitude up to the illegal position, then the drive speeds up and move 180 degrees in azimuth so that the optical tube assembly can now be lowered in altitude to keep up with the overhead object. Confusion arises because the LX200 does not know which side of 180 degrees of azimuth that it is on. Similarly, Polaris presents position problems in ALTAZ alignment because it is so close to the North Celestial Pole. In this region of the sky, the lines of Right Ascension are so close together that even the LX200’s high-resolution encoders can yield ambiguous data.

In our example of August 5, we would use the August chart, face North and look up about 45 degrees. Cygnus is probably the easiest constellation to recognize, and we will use the star Deneb for our example.

Use the PREV and NEXT key to scroll through the list of alignment stars until the arrow is positioned on Deneb (Display 24).

Display 24

The TELESCOPE and OBJECT LIBRARY features are accessed through a series of menus, which are shown on the keypad hand controller display. You can scroll up or down through the list of choices by using the PREV and NEXT keys, and select the indicated menu option with the ENTER key. Menu choices that are shown in lower case letters are unavailable in the current operating mode (LAND, ALTAZ, or POLAR). If you try to select a lower case menu option, the keypad hand controller will emit three warning beeps. Three beeps always indicate an attempt to perform an invalid telescope operation.

14. Press the ENTER key to select Deneb. The keypad hand controller displays a message (Display 25).

Display 25

15. Center the alignment star (Deneb in our example) in the eyepiece of the telescope. You can manually move the telescope by loosening the Dec. lock knob and R.A. lock or electrically by using the N, S, W, and E keys. If moving the telescope electrically, be sure to use the speed keys, SLEW to get close, FIND to center in the viewfinder, and CNTR to center the star in the eyepiece. When the star is centered, press ENTER.

The telescope is now aligned and fully functional, and automatically begins to track objects. From this point on, make all telescope movements using of the keypad hand controller. Manual movements by loosening the Dec. or R.A. locks will cause the LX200 to “lose” position, requiring realignment.

CASTOR A

→DENEB

Center DENEB

then press ENTER

e. Using the MODE Key

The LX200 has 5 basic keypad hand controller displays, and the MODE key is used to move between them. The 5 modes are:

1. Telescope Functions. The TELESCOPE mode is where

all telescope functions are changed or activated and the OBJECT LIBRARY is where the features of the object library are accessed.

2. Telescope Position. The first display shows the RA and

DEC (telescope position in stellar coordinates) and the second display (accessed by pressing the ENTER key) shows the telescope position in ALTAZ coordinates.

3. Time and Date. The first display shows local and Sidereal

time and the second display (accessed by pressing the ENTER key) shows the date.

4. Timer and Freq. This display is a countdown timer and

allows the user to change drive rates. These are advanced features.

5. All Off. This mode simply turns off all displays and

backlighting. You can also adjust the backlighting brightness by pressing the ENTER key and using the PREV and NEXT keys to adjust the brightness.

f. Library Object Keys

While in any of the 5 main keypad display modes, you can directly access the library objects by using the M, STAR, or CNGC keys (see information on the 64,359 Object Library). Simply press an object key, and type in the number of the object desired, followed by ENTER. For example, a good first object for the first part of the year is M42 — the Great Orion Nebula.

Press the M key, the 4 key, the 2 key, and finally the ENTER key. The display will show data on the object (name, rating, object type, brightness, size). Now press GO TO. The telescope will automatically slew to M42.

If the object entered is not above the horizon, the keypad hand controller will display the message “Object Below Horizon.”

Other good first objects (if above the horizon) are any of the M objects — from M1 to M 110, and the planets. To find a planet enter: (NOTE: 903 is the Moon.)

PLANET STAR # PLANET STAR# MERCURY VENUS 902 URANUS 907 MARS 904 NEPTUNE 908 JUPITER 905 PLUTO 909

APPENDIX C

OBJECT LIBRARY PLANET LEGEND

, page 31, of this manual for more

901 SATURN 906

4. Star Alignment

The 2-Star initialization routines provide three options for aligning the LX200 telescope when in the ALTAZ mode.

NOTE:The 2-Star initialization routines only apply to the ALTAZ alignment mode (see and LAND mode initialization).

The first and second options require that entry of the SITE and TIME information as described in Entering Basic Information (page 10). The third option is used when the SITE information is not known or has not been entered into the LX200’s memory.

MODE FUNCTIONS

, page 16, for POLAR

a. 1-Star with Known SITE

The 1-Star alignment routine was explained in detail in Setting Up the Telescope (page 11).

b. 2-Star at Known SITE

To use the 2-Star alignment procedure at a known site, follow these steps:

1. Select the 2-Star alignment (by pressing the “2” key); the keypad display will prompt you to level the base. This leveling step requires a rough level only and, unlike the 1Star alignment routine, does not affect the pointing accuracy of the telescope. (See Section d. below for a summary of the differences in telescope operation when selecting each of the three alignment procedures.)

2. After leveling the base and pressing ENTER, follow the keypad display prompts to select the first alignment star. Slew to that star using the N, S, E, and W keys.

- 13 -

3. Follow the keypad display prompts to choose and center the the second alignment star. Be sure to use the keypad to slew to the second star. After pressing the ENTER key in the last step, the keypad display should show the TELESCOPE/OBJECT LIBRARY screen.

Important Note: Whenever using either of the 2-Star alignment procedures (at a known SITE or at an unknown SITE), choosing the proper two stars will determine the pointing accuracy of the telescope. Choose two stars that are not too close together — try to use stars that are at least 90° apart. Do not use Polaris because RA changes very fast at the Pole and minor centering errors translate to large RA pointing errors. Also, avoid stars near the zenith (straight up) since azimuth changes very fast in this area. Generally speaking, choosing two stars as far apart as possible will yield very accurate pointing, often within a few arc minutes.

The LX200 calculates the distance between the two stars that you chose in the alignment steps and compares this to the distance that you actually slewed the telescope. This is a check to be sure you centered the correct stars during the alignment steps. Should the LX200 discover a discrepancy, the keypad will display an “Align Mismatch — Check Stars” message. If you get this message after aligning the telescope, check that you are using the correct stars and align again.

c. Unknown SITE

To use the LX200 telescope at an unknown location, use the following procedure:

1. Select site #5 (UNKNOWN) from the SITE menu.

NOTE: This site cannot be edited like site numbers 1 to 4 as described in

2. Follow the keypad display prompts to select and center

As described above, the LX200 will check the accuracy of the two stars and give the “Align Mismatch — Check Stars” message if it detects an error.

Entering Basic Information, page 10.

the two alignment stars.

d. Which Alignment Method to Use?

Each of the three method described above has advantages and disadvantages. The following table summarizes these properties.

1-Star 2-Star 2-Star

Known Known Unknown

Pointing Accuracy of Alignment Alignment Determined Telescope By:

Atmospheric Refraction Correction*

Atmospheric Refraction of of Applicable Correction Telescope Telescope Determined By:

When Best when the on a when the Used telescope is transportable SITE

* Atmospheric Refraction Correction: Light from an astronomical object is “bent,” (refracted) as it passes through the atmosphere. This bending is more pronounced near the horizon because there is more atmosphere for the light to pass through, and it shifts the apparent position of the star. The LX200 calculates this bending and compensates for it when slewing to objects near the horizon.

Level 2-Star 2-Star

Yes Yes No

Level Level Not

Best used Best used Best used

permanently telescope information

mounted with the is not

and SITE available

accurately information

leveled available

THE LX200 KEYPAD HAND CONTROLLER

Designed to make you a better astronomer, the integration of optics, mechanics, electronics, and software in the LX200 Maksutov Cassegrain or Schmidt Cassegrain Telescope is easily mastered. So easy, in fact that the telescope becomes a natural extension of the observer.

The LX200 gives you virtually every telescope function possible with every control in a compact hand held console. The red LCD backlit keypad has tactile touch buttons (some of which are brighter than others), designed to have the right feel even if you wear gloves. Its red LCD backlit display, key arrangement, and easy to understand information allow you to focus the telescope and your mind on the subject at hand.

The LX200 keypad hand controller is a dual axis drive corrector with periodic error control; an information display center for the computerized library; a digital coordinate readout system; a pulsing, illuminated reticle eyepiece brightness controller; a two speed electric focuser controller, and a red LED flashlight!

You will find within a few minutes of powering up the LX200 that the keypad becomes warm, which is normal for the system. The electronics utilize a heat sink as a means to provide the correct operating environment temperature for the LCD display even in sub-zero weather. If you are in these colder conditions, the display may not be visible until the keypad has transferred enough heat. This process can take a few minutes upon powering up the telescope. While severe cold weather is not damaging to the electronics, it is advised to keep the keypad in a warmer area to allow immediate proper display performance.

Fig. 6: Keypad Hand Controller. (1) ENTER Key; (2) MODE Key; (3) GO TO Key; (4) Direction Keys;(5) RETURN Key; (6) Speed Keys; (7) Red LED Light; (8) Display; (9) Focus Key; (10) Object Keys; (11) MAP Key; (12) PREVIOUS and NEXT Keys.

The LX200 keypad buttons are described as follows:

1. ENTER Key

The ENTER key (1, Fig. 6) is used to select a menu file, a file option, or to edit a value. To select a file or an option, press and release the ENTER key. The LX200 will give a short beep tone and perform the action that you have requested. To edit a value, press and hold the ENTER key until a double beep tone is heard and a blinking cursor appears in the display. There are some other specific situations where the ENTER key is used. These are described in detail where necessary. From now on, the two types of presses will be called ‘press’ and ‘press and hold.”

- 14 -

2. MODE Key

The MODE key (2, Fig.6) cycles through the five modes of the LX200, and is used to exit from specific menu files.

3. GO TO Key

The GO TO key (3, Fig. 6) causes the LX200 to automatically slew to specific library entry coordinates. The GO TO key also produces a blinking cursor in the GO TO menu file of the COORDINATES/GO TO mode, to allow new Right Ascension and Declination coordinates to be entered.

4. Direction Keys

Labeled N, S, E, and W, (4, Fig. 6) these four keys make the LX200 move, or slew, in a specific direction, with an option of four different speeds, explained later. During entry to change a value, the E and W keys can be used to move the blinking cursor back and forth across the LCD display, so that if an error is made during entry, it can be erased and changed.

The remaining 12 keys have multiple functions, there are up and down arrow keys, and numbered keys from 0 through 9. Each one of these keys also has alternate functions listed above the arrow symbols and numbers. The ALT LED light is only visible when entering numerical data. A description of the individual keys follows:

5. Speed Keys

These keys (6, Fig. 6) allow you to set the rate of movement (slew) speed in the drives of the LX200, as activated by the N, S, E, and W keys. The chosen rate is indicated by the speed indicator illuminated LED beside the rate key that you have pressed. the speed rates are SLEW (4 degrees per second), FIND (1 degrees per second), CNTR (16X sidereal rate), and GUIDE (2X sidereal rate).

NOTE: All of the slew speeds will drive the LX200 in all four directions, except for GUIDE.The 2X sidereal speed in GUIDE has one difference in that it will not interrupt the Right Ascension tracking direction to make Easterly (for Northern hemisphere) or Westerly (for Southern hemisphere) adjustments; it will merely slow down the tracking drive to one half its normal speed. You will find, however, that the slower drive will move the image opposite of the tracking direction, without disturbing the smooth drive action. This performance is absolutely essential when making astrophotographs.

SLEW, FIND, CENTER, and GUIDE keys also have numbers listed 7, 4, 1, and 0 respectively. When editing a value, the multiple function of each of these keys is realized. SLEW and FIND are also used to set the “fast” focus speed for the electric focuser accessory option, while CNTR and GUIDE set the “slow” focus speed. There are other special functions for the CNTR and GUIDE keys that are discussed in the RET KEY operations.

(SLEW, FIND, CENTER, and GUIDE)

6. RET Key

Typically used for guiding the LX200 during an astrophotograph, the RET key (5, Fig. 6) is used to change the brightness and pulse rate of the optional corded style illuminated reticle eyepiece. Pressing either the PREV and NEXT (up and down arrow) keys while holding down the RET key, alters the reticle brightness level up or down.

When guiding on very faint stars, you may find it helpful to pulse the light from the LED so that the reticle crosshairs blink on and off. You will be able to adjust the reticle brightness as well as adjust the pulse rates. There are three pulse rates that can be used, all with a one second pulse interval. The continuous illumination control and pulse rates are set by holding down the RET key and pressing one of the following keys; GUIDE (100% on, no pulsing), CNTR (50% on, 50% off), MAP (25% on, 75% off), CNGC (10% on, 90% off).

- 15 -

7. FOCUS Key

The FOCUS key (9, Fig. 6) allows 2 speed electric focus control of the optional Meade #1206 Electric Focuser (or equivalent corded electric focusers such as the Meade Model #1200A). To activate, press either the SLEW or FIND key (for fast focusing), or the CNTR or GUIDE key (for slow focusing), press and hold the FOCUS key, and then press and hold the PREV or NEXT keys for near and far focus.

8. MAP Key

The Map key (11, Fig. 6) turns on and off the red LED ‘flashlight’ that is located at the top of the keypad. The deep red LED light will protect your night vision while you search for a particular accessory or examine a star chart.

9. Object Keys

These keys (10, Fig. 6) allow direct access to the LX200’s Object Library any time that you are not editing a value or setting a parameter, or selecting a file menu. Use the Object keys when you are at a “top level” of a mode. After pressing one of these keys, the keypad’s display will give a blinking cursor, allowing you to enter the catalog number for objects listed in the library (see ENTER key. To see the entered object press the GO TO key. A brief description of the catalog key symbols are; M (Messier objects), STAR (stars and planets), and CNGC (Computerized New General Catalog).

The 16" LX200 has several object libraries which are accessed with the STAR and CNGC keys.

When you press the STAR or CNGC keys, the display will show which object library you are currently in and wait for a number entry, as described above.

To switch to a different library, press the ENTER key instead of entering a number.

The keypad display will show a menu of libraries available. Move the cursor to the desired library and press ENTER to select.

The 16" LX200 will “remember” the database you last accessed. Each time you press the STAR or CNGC keys, the same object database will be displayed on the first line of the keypad display.

(M, STAR, and CNGC)

APPENDIX C

, page 31). After entry press the

10. PREV AND NEXT Keys

The PREV and NEXT (up and down arrow) keys (12, Fig. 6) move the display LCD arrow up and down the menu files and menu file options, so that you may choose an individual selection to enter. These keys are also used when adjusting the RET brightness range, or when activating the electric focuser. PREV and NEXT work as well to select the objects from the

Object Library when using START FIND.

Fig. 7: 16” LX200 Power Panel. (1) Ammeter; (2) RS-232 Connector; 3) Aux Connector; (4) Focuser Connector; (5) Reticle Connector; (6) Keypad Connector; (7) ON/OFF Switch, (8) N/S Switch; (9) 12v DC Power Connector; (10) CCD Connector; (11) DEC Motor Connector.

The power panel incorporates a power switch and LED indicators showing power on with a current ammeter to show power draw.

The power panel has all of the connectors for the AC or DC power input, the DEC Motor, and the keypad. There are connectors designed to accept optional accessories such as a CCD autoguiding camera, the optional Meade Field DeRotator, the Meade #1206 Electric Focuser, and an illuminated reticle eyepiece. There is even a connector for RS-232 communication that will allow you to perform every function of the keypad from your personal computer. An illustration and a description of the 16” LX200 power panel features follows:

1. ON/OFF Switch

When the ON/OFF Switch (7, Fig. 7) is moved to the ON position, the power light indicator, the Current Ammeter, and the keypad all light up. You will hear the drive motors rev which momentarily pegs the Ammeter, then the drive motors shift to a slower speed which allows the RA worm gear to find its centering position for calibrating the Smart Drive, then resuming to an even slower tracking speed. The keypad display reads “Meade,” then the version of the software is indicated briefly before defaulting to the TELESCOPE/OBJECT LIBRARY. Within 15 seconds, the planetary orbital calculations with their corresponding apparent sizes and magnitudes, and current stellar precession calculations are made. Every computer function is checked, and the LX200 diagnostics are complete.

2. N/S Switch

The recessed N/S Switch (8, Fig.7) converts the LX200 for operation in the Northern or Southern hemisphere, making the drive reverse its’ tracking direction. Before power up, the appropriate N or S switch position should be made, as the LX200 will not recognize a change made on the N/S switch afterwards. Use a pen or small tool to slide the switch appropriately. Be sure before you travel across the equator, that you are setting the proper + or - latitude SITE entry for your final destination.

3. Ammeter

The Ammeter display (1, Fig. 7) is a series of vertical red LED bars. Each bar that is fully lit represents 0.3 ampere (300 milliamperes) of current draw. The LED Ammeter represents its lowest value on the extreme left of the scale. During normal tracking speeds, the Ammeter will show about three fully lit LED bars and at times a fourth that is partially lit, indicating about 900 to 1000 milli-amps or 0.9 to 1.0 amps of current draw (when a slew is initiated, the ammeter will peg the scale momentarily showing the inertia load, this effect is entirely normal). The current draw information can be useful if you are trying to calculate how much battery life you will have during an

THE LX200 POWER PANEL

observing session. As an example, if the ammeter has four bars lit, indicating 1.2 amps and you are using a 12 amp hour battery, then to know the approximate number of hours of life the battery would yield by dividing 12 by 1.2. This indicates a battery life of 10 hours.

4. DEC Motor Connector

The DEC Motor Port (11, Fig. 7) is a DB-9 socket, designed to accept the supplied coil cord. One end of the supplied coil cord plugs in to the power panel and the other plugs into the DEC MOTOR socket in the right fork arm to power the declination motor.

5. CCD Connector

The CCD Port (10, Fig. 7) allows direct interface from popular aftermarket CCD autoguiding/imaging cameras with their compatible connecting cables to accomplish autoguiding for non-attended astrophotography. The CCD cameras effectively watch a star and detect slight movements. When star movements are detected, signals from the CCD electronics make drive corrections in the LX200, to bring the star to a home position.

Most CCD autoguiding/imaging cameras are supplied with a cable which is compatible with the LX200 port. If your CCD unit does not have a cable, one can be obtained from the CCD manufacturer, or you can make your own cable using the following table of information.

CCD LX200

Connector Pin Assignment

#1 Normally Closed #2 West #3 North #4 Ground #5 South #6 East

6. Power 12 vDC Connector

The power 12 vDC connector (9, Fig. 7) is designed to accept either the standard-equipment AC Converter or the optional DC Power Cord. The acceptable voltage range (under load) is from 12 to 18 volts.

7. Keypad Connector

The keypad connector (6, Fig. 7) is a 4 pin phone jack connector socket, designed to accept standard 4 pin phone jack coil cords. One end of the supplied coil cord plugs into the keypad port, the other end plugs into the LX200 keypad.

8. Reticle Connector

The Reticle connector (5, Fig. 7) accepts optional accessory corded, plug-in style illuminated reticle eyepieces such as the optional Meade 12mm Illuminated Reticle Eyepiece, or the Meade Series 4000 Plössl 9mm Illuminated Reticle Eyepiece (corded style), to allow brightness control and on/off pulsing rates to be set from the LX200 keypad.

9. Focuser Connector

The focuser connector (4, Fig. 7) accepts optional accessory corded, plug in style electric focusers such as the Meade #1206 Electric Focuser, to allow electric focus adjustment control from the LX200 keypad.

10. RS-232 Connector

The RS-232 connector (2, Fig. 7) allows personal computer interface to allow communications at 9600 baud to access every feature of the LX200 keypad. Many popular astronomy programs are available which directly interface with Meade LX200 telescopes, including Epoch 2000sk Sky Software by Meade Instruments Corp. In manual is a wiring schematic to make your own RS-232 connector cord, a cord test program, a demonstration program, and the LX200 Command Set for writing programs. Meade Instruments supplies this information for professional programmers. Meade Instruments Corporation does not offer support or advice for writing software for the RS-232 option.

APPENDIX F

(page 58) of this

11. Aux Connector

The Auxiliary connector (3, Fig. 7) is used for the 7" Maksutov fan power.

- 16 -

MODE FUNCTIONS

To view the separate modes within the LX200 system, press the MODE button located between the ENTER and GO TO keys at the top of the hand controller. Simple entry and editing of information in the different modes contained within the system, will customize the operation of your LX200 to perform virtually any of your observing requirements. Better still, all of the critical information such as time, location, alignment type, and many other functions are kept in memory...even with the LX200 turned off!

The type of alignment, the objects that you see, the location that you observe from, the tracking speeds of the drives, all of the clock and timing functions, the position information, and even the brightness level of the backlit keypad are defined by the information that you give and/ or the commands that you edit, through five different modes of the LX200 computerized hand controller.

Once you have selected the desired mode, you can then select the individual file within the mode by pressing the PREV or NEXT key (up and down arrow key) in the bottom right hand portion of the hand controller, moving the LCD arrow up or down beside the file description. Although you will only be able to see two menu selections at a time in the keypad display, you will see more as you continue to press the PREV and NEXT keys.

When the desired file is chosen, press the ENTER key to view the files menu. To choose an individual menu, again use the PREV or NEXT key to run the LCD arrow up or down the files menu. To explore a menu selection, again press the ENTER key. In some modes there will be options for a files menu selection, in others you will only enter data.

At any time that you wish to return to main file heading in a particular mode, just press MODE and it will behave as an exit key.

1. Mode One:

This is the mode that the LX200 will default to after the instrument completes its self-check, when the LX200 is first turned on. The TELESCOPE/OBJECT LIBRARY mode can be thought of as command central. It is here that we can select the way that we want the LX200 to perform mechanically, and where we can explore and select from its extensive library of stored objects.

To explore either the TELESCOPE menu file or the OBJECT LIBRARY menu file, move the LCD arrow to the appropriate selection by using the PREV or the NEXT key and press the ENTER key.

TELESCOPE/ OBJECT LIBRARY

a. TELESCOPE Menu File

Below are the 14 selections of the TELESCOPE menu file, illustrating the individual menu files and file options.

1. SITE:The SITE menu option allows you to enter up to four

of your favorite viewing locations in longitude and latitude. The entered longitude and latitude is compared by the LX200’s computer to your local time, GMT offset, and calendar date to accurately calculate celestial coordinates. Once entered, the information is stored in the telescope’s internal memory, you need never re-enter the same information. To enter new site information or to change an old one, see

You can choose any one of the four site options (or the UNKNOWN site) at your convenience, without the bother of entering longitude and latitude every time you use the LX200. Once the site is chosen, exit the SITE menu by pressing the MODE key.

2. ALIGN: The Align menu selection of the TELESCOPE file

demonstrates the unique ability to transform the LX200 into an Altazimuth, celestial tracking telescope, a polarequatorial celestial tracking telescope, or land spotting scope with electric Altazimuth movements within three

QUICK START

, page 9.

options, which are; ALTAZ, POLAR, and LAND. Assuming that you have already entered correct local

time, latitude, and longitude (see you are ready to choose a particular type of alignment, by pressing the NEXT or PREV key to run the arrow beside the desired option of ALTAZ, POLAR, or LAND, and then pressing the ENTER key. The display will then give you specific instructions from this point that will literally walk you through the chosen alignment type.

a. ALTAZ: ALTAZ (Altazimuth) requires that you mount

the LX200 directly to the top of the field tripod (with the power panel facing North), and adjust the leg extensions of the tripod until the instrument is level. You are then required to align on one or two of the bright stars in its look up table of 33 alignment stars. This allows your LX200 to track in altitude and azimuth simultaneously for visual observations, or very brief (under five minutes) exposure astrophotography or CCD imaging (longer exposures will require the Field De-Rotator). ALTAZ allows you to fully access the Object Library as well as all other telescope functions. Complete instructions for using ALTAZ are in the

b. POLAR: POLAR allows you to use the 16” LX200

(mounted on a permanent pier set to your latitude) as an equatorial telescope. With the LX200 powered up, the POLAR file option selected, and the field tripod leveled, the telescope should be adjusted so that the Declination setting circle (3, Fig. 1) is set to 90 degrees and the telescope is rotated to the 00 hour angle (HA) position in Right Ascension. In this position, the viewfinder (Fig. 1) is up-side down, and the R.A. pointer (4, Fig. 5), the 00 line of the R.A. setting circle (3, Fig. 5), and the HA pointer (5, Fig. 5) all line up. (If you do not start at the 00 H.A. position, the telescope will point to the ground instead of the sky, when the keypad display chooses its second star.) Press the ENTER key and the LX200 will determine and slew to the precise off-set of the pole star in Declination and Right Ascension.

At this point you need only aim the instrument at the pole star (see is not visible) and center it in the eyepiece field using only the altitude and azimuth adjustments on the pier. Once done, you again press the ENTER key and the LX200 will choose and slew to a very bright star that is overhead and can usually be seen in the field of view of the viewfinder. At this point, center the bright star using only the Right Ascension and Declination adjustments of the telescope (either manually by loosening the locks only or electrically), then press ENTER. You can now access every every function of the LX200.

c. Refined Polar Alignment: Astrophotographers

routinely require polar alignments of the highest accuracy for the finest guiding characteristics. Your initial polar alignment can be refined by using the LX200’s electronics by using a slightly different method in the POLAR menu option. The steps outlined below should be performed in two or three 15 minute intervals. At each interval the telescope will slew to the area where the pole star should be centered in the optics. You may find that the pole star is somewhat off-center in the eyepiece showing the alignment error that may have been made during your initial setup. Re-center the pole star during each interval using the tripod adjustments only (see

APPENDIX B

follow the rest of the routine. Return to the POLAR menu option in the

QUICK START

APPENDIX C

, page 29) in altitude and azimuth, then

QUICK START

(page 9).

, page 31, if the pole star

, page 9)

- 17 TELESCOPE mode and press the ENTER key.

Ignore the keypad display instructions to return the telescope to 90 degrees in Declination and 00 HA. Instead, press the GO TO key and the LX200 will slew to the calculated position of where the pole star should be.

Re-center the pole star in the field of view in the eyepiece using only the adjustments on the pier in altitude and azimuth.

Press the ENTER key, and the LX200 will once again slew to a bright star overhead. Center this star using the N, S, E, or W keys, then press ENTER.

NOTE: Pressing the MODE key at any point in the alignment routine aborts the routine and exit to the top menu.

After each 15 minute interval you will find that the pole star becomes more accurately centered each time. You can repeat the intervals as often as you like to obtain the highest accuracy. An optional illuminated reticle crosshair eyepiece makes the job of centering the star easy.

There may be situations when it is impossible to see the pole star due to something blocking your line of sight. On such an occasion, just press the ENTER key for the POLAR option so that it has a check next to it, then follow the instructions in Precise Polar Alignment, page 30. You will require the use of an illuminated reticle crosshair eyepiece* to complete the task. Once finished, follow the steps below for a permanently mounted LX200 section to access the Object Library.

d. The Permanently Mounted, Polar Aligned LX200:

For those who will permanently mount the LX200 in an observatory, or wish to use the already polar aligned telescope for several nights in succession, it is recommended that a high precision polar alignment be made with one of the methods described above. Once done, however, you need not bother yourself to go through a polar alignment routine on successive nights (provided that you do not move the instrument on the pier) to access the Object Library and enjoy near perfect tracking.

To bypass the polar alignment sequence, follow the steps outlined below:

• Return to the POLAR menu option and place a check next to it by pressing the ENTER key.

• Then directly enter the catalog number of an object that you are familiar with in the sky by pressing the M, STAR, or CNGC key (see for information on the Object Library) and press the ENTER key again.

• Manually center the familiar object in the eyepiece of the telescope.

• Press and hold the ENTER key until the display reads “Coordinates matched.”

You have now synchronized the Object Library and the LX200 will correctly access every other object in the sky.

e. LAND: The LAND menu option transforms the

ALTAZ (Altazimuth) mounted LX200 into an electric slewing spotting scope. In this mode, continuous tracking is canceled and all of the celestial modes and menus are non-functional, showing lower case lettering in the displays and a beep tone if you try to enter one of them.

The LX200 will slew at any one of the four speeds of SLEW, FIND, CNTR, and GUIDE as activated by pressing the appropriately marked keys on the left

APPENDIX D

, page 34,

side of the keypad. Altazimuth coordinate readings can still be displayed in the coordinates mode (see MODE 2, page 22). Refer to for the LAND menu option, for full operating procedures. You will also find that the addition of the Meade #928 45-Degree Erect Image Prism or the Meade #924 Porro Prism instead of the standard supplied star diagonal prism, will give the normal right-side-up and left-to-right views that you are accustomed to when using a spotting scope.

3. SMART: The SMART menu file controls the Smart Drive

and allows you to train almost all of the periodic error from the Right Ascension drive worm gear (errors induced by tiny gear imperfections that tend to slightly speed up or slow down the drive tracking speed, that occur in a regular 8 minute pattern, or for every rotation of the worm) for greatly enhancing the tracking characteristics or the amount of East and West drift of your LX200. This greatly simplifies guiding during astrophotography. The menu also has provisions for correcting Declination drift. Smart Drive will retain the training given to the R/A drive, even after the telescope is turned off. There is of course a way to erase any training given to it at your command.

The SMART menu has five options. They are; LEARN, UPDATE, ERASE, DEC LEARN, and DEC CORRECT. To use the Smart Drive, the LX200 must be mounted with the optional equatorial wedge (see equipped with an illuminated reticle eyepiece*, and used in the POLAR align menu selection. Be sure to train the Smart Drive in the 60.1 Hz Quartz setting that the LX200 will be automatically set at power up. Thereafter, you can adjust this setting in the TIMER/ FREQ mode and still enjoy the periodic error correction.

Once a polar alignment has been completed, your LX200 will point to a bright star overhead that will be near the Celestial Equator. This will be a good star to train the Smart Drive on. You can of course, move to another star just as long as you are near 0 degrees in declination and more or less overhead in Right Ascension. Now is good time to set the brightness and/ or the pulse rate (see

LX200 KEYPAD HAND CONTROLLER

illuminated reticle on the guide star and practice guiding for a few minutes.

To actually begin training the Smart Drive, move the LCD arrow to LEARN by using the PREV or NEXT key and press ENTER. There will be numbers that will appear next to the LEARN display, that will begin counting down to zero. The highest number that can appear is 240. The period of the worm is eight minutes and the number represents a sector of the worm wheel which will change to the next lower digit every two seconds. As the keypad display approaches sector 5, an alarm will alert you that training is about to commence. At this point try to keep the star on the same location of the crosshair during the eight minute training sequence by pressing the N, S, E, and W keys. After eight minutes, the training is over and Smart Drive will play back the drive corrections automatically, dramatically improving the R.A. drive tracking.

If you wish to further refine the accuracy, move the LCD arrow to UPDATE and press ENTER and follow the same instructions as above. This can be done in UPDATE as many times as you wish. With each training the Smart Drive will average your training sequences.

If you find that you have made a mistake in training (e.g. pushed E instead of W when you should have), you can eliminate the memory by moving the LCD arrow to ERASE and press ENTER.

A star that drifts consistently North or South during guiding, can also be corrected for. Move the LCD arrow to DEC LEARN and press ENTER. Begin making drive

QUICK START

APPENDIX A

, page 14) of the

(page 9)

, page 25),

THE

- 18 corrections immediately by pressing any of the direction

(N, S, E, W) keys to keep the star on the crosshair of the guiding eyepiece. It is suggested that you train in DEC LEARN for at least half of your intended exposure time for an astrophoto. The longer that you train, the more accurate the DEC LEARN will be. Once the desired time is finished, press ENTER and the training will cease. The Smart Drive will then determine how many key pushes that you gave in N and S and choose the direction based from which direction received more commands. It then averages the time between key pushes in the chosen direction. In this way, the Smart Drive can correct for Declination drift (should your polar alignment be slightly off), or will allow you to more precisely guide on nonstellar objects, such as comets, asteroids, etc.

To play back your DEC LEARN training, move the LCD arrow to DEC CORRECT and press ENTER. To halt the play back press ENTER again. To erase the DEC LEARN training, either move the LCD arrow back to DEC LEARN and press ENTER twice or turn the LX200 off.

4. 12/24 HR: The 12/24 HR menu selection of the

TELESCOPE file simply toggles between a 12 and 24 hour display of local time in the time mode.

To toggle between 12 and 24 hours displays, move the arrow to 12/24HR and press ENTER. To return to the original setting, press ENTER again.

5. HELP: The HELP menu selection of the TELESCOPE file

is an electronic mini-manual that will briefly describe the function of each command key on the LX200 keypad.

To use this menu, move the arrow with the PREV or NEXT key to HELP and press ENTER. To read the lines of text, use the PREV and NEXT keys. To exit, press MODE.

6. REVERSE N/S: The REVERSE N/S menu selection of

the TELESCOPE file reverses the direction of the telescope in North and South movements (e.g., when you press the N key the scope will move South or down instead of North or up). This is especially useful during some guiding applications in imaging and observing.

To use the REVERSE N/S menu, move the arrow to REVERSE N/S and press ENTER. If you wish to return the direction commands to the original setting, press ENTER again.

7. REVERSE E/W: The REVERSE E/W menu selection of

the TELESCOPE file reverses the direction of the telescope in East and West movements (e.g., when you press the W key, the telescope will move East instead of West).

To use the REVERSE E/W menu, move the arrow to REVERSE E/W and press ENTER. If you wish to return the direction commands to the original setting, press ENTER again.

8. BALANCE: When adding optional equipment to the

LX200, like a heavy camera, it is often necessary to rebalance the telescope using the Meade #1404 Tube Balance Weight Systems.

Selecting option #8 from the TELESCOPE menu moves the LX200 telescope rapidly up and down in Declination. This provides an easy way to determine when the telescope is balanced in the Declination axis. (Remember, loosening the Dec. lock to check the balance will cause the LX200 to lose alignment.)

When the telescope is out of balance, the LX200 will draw more current when slewing in the “heavy” direction and the Dec. motor will sound different.

After selecting option #8, watch the Ammeter and listen to the Declination motor to determine when the LX200 is balanced.

9. HI-PRECISION: The High-Precision Pointing feature of

LX200 allows for very precise pointing of the telescope. By incorporating the unique LX200 SYNC command, 0.3 arc-sec resolution encoders, and high-speed DC servo motors, observers can now place objects in the telescope’s field of view with 1 arc-minute or better pointing accuracy. This makes critical image placement applications, such as CCD imaging, possible.

Normal telescope pointing accuracy is better than 5 arcminutes when doing a casual alignment, which is more than accurate enough for most observing applications. (A “casual” alignment is one that uses the UNKNOWN SITE or one that is done without the use of a reticle eyepiece to exactly center the alignment stars.) This type of alignment will put objects into the field of view of most eyepieces and is more than adequate for almost any visual observing application.

A “critical” alignment will improve the pointing accuracy of the telescope to 2 arc-minutes or better. This type of alignment requires accurate SITE information, time, date, proper selection of the two alignment stars, and a reticle eyepiece to exactly center the alignment stars. These steps generally require only a few extra seconds to accomplish, and will improve the telescope’s positioning by a substantial amount. Using the “critical” alignment will provide telescope positioning suitable for all but the most demanding pointing applications — including CCD imaging with larger chip cameras, like the Meade Pictor 416 and Pictor 1616 CCD cameras.

The HI-PRECISION feature increases the pointing accuracy of the LX200 to 1 arc-minute or better and also requires the “critical” alignment described above. This will yield the best pointing accuracy possible, placing objects onto the active area of the even the smallest CCD cameras available.

It should be stressed that for most applications, using the HP feature is NOT required to get maximum enjoyment out of the telescope. For an evening of simple visual observations, the “casual” alignment is all that is required. Don’t let the pointing precision of the telescope become more important than the fun of observing the night sky!

The High-Precision Pointing mode requires the “critical” alignment, described above, to maximize the telescope’s pointing ability. The LX200 default condition is with HP disabled. To activate the HP mode, select the “hiprecision” option from the TELESCOPE menu (option #9). When selected, “HI-PRECISION” will change to upper case letters.

When HP is active, the LX200 automatically does several things whenever a GO TO is initiated.

a. HP will search the alignment star database and find

the three closest stars to the object (or position) entered. This process takes about 10 seconds and the keypad will show Display 26:

Display 26

b. The telescope will slew to the nearest alignment

star. These are all bright (brighter than 3rd magnitude) stars and far enough apart to insure that there will only be one in the field of view. The keypad display will show Display 27:

Display 27

HI-PRECISION

Searching. . .

Center STAR XXX then press GO TO

Using a reticle eyepiece, center the star in the field of view. (Or center the star on the CCD chip if using a CCD camera.) Press GO TO when the star is centered.

- 19 -

NOTE: If this star is not in the field of view or if it is obstructed by a land object, the other two stars are available. Use the PREV and NEXT keys to cycle through the three closest stars.

c. The telescope will slew to the selected object or

position.

10. SLEW RATE: Option #10 in the TELESCOPE menu is for

changing the slew rate of the LX200 telescope. Slowing down the slew rate will result in less noise as the telescope moves and will also use a little less power. To change the slew rate, follow these steps:

a. Press the MODE key on the keypad until the

TELESCOPE/OBJECT LIBRARY menu appears. The cursor should be next to the TELESCOPE option — if not, press the PREV key to move the

cursor up one space. b. Press ENTER to select the TELESCOPE functions. c. Press the PREV or NEXT keys to move the cursor to

option #10: SLEW RATE. On the right hand part of

the display, the number 4 is displayed. This

represents the current slew rate in degrees per

second. d. Press the ENTER key to change the slew rate. Each

successive ENTER key press increments the slew

rate by 1 degree per second. e. After setting the desired rate, press the MODE key to

return to the TELESCOPE/OBJECT LIBRARY menu.

NOTE: The slew rate is NOT stored in permanent memory and needs to be reset each time the telescope is powered up. The default slew rate is 4 degrees per second.

11. BACKLASH: The Backlash feature is only available in the

POLAR mode.

When taking long exposure astrophotographs, it is necessary to “guide” the photograph to make sure the telescope is tracking perfectly, otherwise stars will appear as ovals instead of pinpoints. This is done by setting the LX200 keypad to the GUIDE speed, monitoring the star location (e.g. with an off-axis guider), and making small corrections to the telescope position by using the N, S, E, and W keys.

When making these corrections, the R.A. motor will speed up or slow down (by pressing the “E” and “W” keys). The Declination motor, however, when activated (by pressing the “N” and “S” keys) will actually stop and reverse direction. Because of backlash in the Declination motor gearbox, there will be a few seconds delay before the telescope begins to move when reversing direction.

The Dec. backlash feature compensates for the Dec. motor gearbox backlash and provides instant telescope movement when the motor is reversed.

To program the Dec. backlash, use this procedure: a. Move to option #11 from the TELESCOPE menu.

The keypad display will show:

“

’11) BACKLASH 00”

The “00” in the display shows the number of arcseconds of backlash the LX200 is set to compensate for (the default setting is 0 arc-seconds).

b. While observing a star at high power, time the

Declination movement delay when reversing the motor directions (by pressing the “N” and “S” keys). Typical values are 2 to 4 seconds.

c. The GUIDE speed for the Declination motor is 15

arc-seconds per second. Therefore, multiply the number of seconds delay by 15.

d. Press and hold the ENTER key for 1 second. The

keypad will beep and a blinking cursor will appear on the keypad display. Enter the number determined in

step c, above. Press ENTER when the number is entered.

e. Check the time delay as described in step b. If there

is a delay, increase the compensation number. If there is a slight jump when reversing direction, then the number is too large.

When the compensation number is correct, the LX200 telescope will move almost instantly when reversing the direction in Declination. This compensation feature also works in conjunction with popular CCD autoguiders, allowing for more accurate autoguiding.

This number is stored in permanent memory and should never need to be set again.

b. OBJECT LIBRARY Menu File

The OBJECT LIBRARY menu file is the other half of the TELESCOPE/OBJECT LIBRARY mode. With it you can become a tourist of the sky, or conduct research surveys of the 64,359 objects. The LX200 Object Library is accessible in the most results-getting, user friendly system ever designed for observers and astrophotographers.

The core library, essentially a “greatest hits of the sky,” encompasses eight planets of our solar system from Mercury to Pluto, 351 stars (doubles, variables, pole stars), the entire Messier catalog of 110 objects, 7840 of the finest galaxies, diffuse and planetary nebulae, and globular and open star clusters

The position epoch of these objects is for real time, updated each time you turn on your LX200. Even the planet’s positions have their orbits calculated! This not only qualifies the LX200 as the most accurate integrated object library available, it will never require updated software for precession of the stars or planetary orbital changes.

There are three primary ways to use the Object Library. You can directly access the library by using the M, STAR, or CNGC keys (see entering a specific catalog number, the START FIND option can be used to logically find objects in organized strips of the sky that can be custom tailored to only show the objects you wish to see with a selection of object types, size brightness, etc., or you can scan the sky and have the Object Library tell you what is in the field of view in the eyepiece by using the FIELD option. Below is a description of the four OBJECT LIBRARY menu files and file options:

To access the OBJECT LIBRARY menu file, move the arrow to the OBJECT LIBRARY display by pressing the PREV or NEXT key while in the TELESCOPE/OBJECT LIBRARY mode and press the ENTER key. Now you can access the four menu selections within the OBJECT LIBRARY by moving the arrow to the desired menu selection by using the PREV or NEXT keys and doing the following steps.

1. OBJECT INFO: Press the ENTER key to read the type,

2. START FIND: The START FIND option resources the

THE LX200 KEYPAD HAND CONTROLLER

brightness, size, and quality. Press ENTER again to read the coordinates. Press ENTER once more to determine how far off the telescope is pointing from the entered object (this is displayed in LCD bars, each bar is ten degrees, or if it is on the object, no bars). This same information can also be accessed at any time by pressing the ENTER key for any object entered by the M, STAR, or CNGC keys. Press MODE to exit to the main menu file.

CNGC objects within the Object Library and begins a logical search starting wherever the telescope is positioned when activated. To cover the entire visible sky it will make 31 strip divisions about 12° wide, moving from West to East, from the North Pole to the South Pole, then South to North. Once it has found all of the CNGC objects it will repeat its sequence until new objects are visible.

, page 14) and

- 20 Press the ENTER key and the hand control will display the

first object in its finding sequence. This first object is selected by the LX200, based off of where the instrument is pointing in the sky when you entered START FIND. To point your LX200 to the object displayed, press the GO TO key and it will slew to the object.

While in the START FIND option, you can either choose the next object in line or skip it as you wish. In order to find the next object in sequence, press the NEXT key, and the display will show the new CNGC object. If you do not wish to view this object, press NEXT again. If you wish to return to a previously viewed object, press the PREV key until the desired catalog number is displayed and press the GO TO key. If you have set some limitations in the PARAMETERS option, it will only find those objects within your chosen confines.

If you find that the object is not well centered in the eyepiece after executing a GO TO (due to poor leveling, improper time input, or errors in site location), center the object; then press and hold the ENTER key until the display reads “Coordinates Matched.” This feature in essence synchronizes the LX200 for an area of the sky, so that the next object (if the leveling, time input, or site location information is not corrected) will be better centered, provided it is not too far away from the object that you matched coordinates to.

To exit the START FIND menu selection (and cease its operation) to the main menu, press MODE.

3. FIELD: Press the ENTER key to identify objects in the

field of view of the telescope. The LX200 will display the object centered in the eyepiece field, and how many other NGC objects are in the field at the same time (defined by the RADIUS parameter setting) as shown in Display 28:

Display 28

Press the ENTER button to reveal information about the object as shown in Display 29:

Display 29

Display 29 is interpreted; COMPUTERIZED NEW GENERAL CATALOG Object #4438, VERY GOOD, GALAXY, MAGNITUDE 10.1, SIZE 9.3’ (in arc minutes).

Press ENTER again to read the coordinate location of the object (notice the * legend next to RA coordinate number, it indicates the catalog coordinates of the object, not necessarily where the telescope is pointing) as shown in Display 30:

Display 30

Press ENTER once more to see physically how far your telescope will have to move to acquire the object entered. The display will show LED bars, each bar represents ten degrees of movement as shown in Display 31:

Display 31

Objects: 5

Center: CNGC 4438

CNGC 4438 VG GAL MAG 10.1 SZ 9.3’

RA = 12:27.2*

DEC = +13'03

■ ■ ■ ■

■

If you are centered on the object already, such as if you are in the FIELD menu selection, or if you have already made a GO TO command in one of the other methods for finding an object, the above display will be blank.

To review any of the data of an object, continue to press ENTER until the desired field appears. You can use these commands at any time that you have an object entered in the keypad, while directly entering in specific objects by pressing the M, STAR, or CNGC keys, in the START FIND

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