Meade DS-114AT instruction manual Specifications

3.Secondary mirror-holder adjustments: If the secondary mirror (1, Fig. 31) is centered in the focuser drawtube (2, Fig. 31), but the primary mirror is only partially visible in the reflection (3, Fig. 31), the three “+” (Phillips head) secondary mirror-tilt screws (2, Fig. 27) should be slight- ly unthreaded to the point where the secondary mirror-holder (3, Fig. 27) can rotate about its axis parallel to the main tube. Grasp the secondary mirror-holder (avoid touching the mirror sur- face!) with your hand and rotate it until, looking through the drawtube, you can see the primary mirror centered as well as possible in the reflection of the secondary mirror. With the rotation of the secondary mirror-holder at this best-possible position, thread in the three Phillips head screws (2, Fig. 27) to lock the rotational position. Then, if necessary, make adjustments to these three Phillips head screws to refine the tilt-angle of the secondary mirror, until the entire primary mirror can be seen centered within the secondary mirror’s reflection. With the second- ary mirror thus aligned the image through the drawtube appears as in Fig. 32.

4.Primary mirror adjustments: If the secondary mirror (1, Fig. 32) and the reflection of the pri- mary mirror (2, Fig. 32) appear centered within the drawtube (3, Fig. 32), but the reflection of your eye and the reflection of the secondary mirror (4, Fig. 32) appear off-center, then the pri- mary mirror tilt requires adjusting, using the Phillips head screws of the primary mirror cell (3, Fig. 28). These primary mirror-tilt screws are located behind the primary mirror, at the lower end of the main tube. See Fig. 28. Before adjusting the primary mirror-tilt screws, first unscrew by several turns (use either a hex wrench or pliers) the three hex-head primary mirror lock screws (2, Fig. 25) which are also located on the rear surface of the primary mirror cell and which alter- nate around the cell’s circumference with the three Phillips head screws. Then by trial and error turn the primary mirror Phillips head tilt screws (3, Fig. 28) until you develop a feel for which way to turn each screw to center the reflection of your eye in the drawtube. (An assistant is helpful in this operation.) With your eye centered as shown in Fig. 29, turn the three hex head primary mirror lock screws (2, Fig. 28) to re-lock the tilt-angle of the primary mirror.

The telescope’s optical system is now aligned, or collimated. This collimation should be re- checked from time to time, with small adjustments (per steps 1, 2, and/or 3, above) effected as required to keep the optics well-aligned.

Specifications

DS-114AT

Optical design	Reflector
Clear aperture	114mm
Focal length	910mm
Focal ratio	f/8
Resolving power	1.0 arc secs
Max power	325X
Mounting	Single-arm, motorized Alt-Az
Alignment	Altazimuth
Slew Speeds	1x sidereal to 5.5°/sec in 9 increments
Tripod	Aluminum, full-length; adjustable w/accessory tray
Optical Tube Dimensions	5.5" x 34"
Batteries (user-supplied)	10 x AA

Autostar

Processor	68HC11, 8MHz
Flash Memory	512KB, reloadable
Keypad	10 key alphanumeric
Display	2 line, 16 character LCD
Backlight	Red LED
RS-232	Optional
Coil Cord	24"
Database	more than 1400 objects
Length	5.60" (14.2cm)
Width (LCD end)	3.08" (78cm)
Width (Connector end)	2.10" (53.5cm)
Depth	0.93" (23.5cm)
Autostar net weight	0.35 lbs (0.169kg)

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