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Summary of Contents for JMI Telescopes NGT-12.5
- Page 1 NGT-12.5 WARNING Owner's Manual Viewing the sun without proper equipment can cause permanent blindness. JMI Telescopes Jim's Mobile, Inc. 8550 W 14th Ave Lakewood, CO 80215 U.S.A.
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Page 3: Table Of Contents
Getting Started ........................... 4 Warning............................5 Collimation ..........................5 Optional Accessories........................5 Specifications..........................6 Uncrating the NGT-12.5 ......................... 7 Shipping Damage........................7 Packing List..........................8 Primary Mirror Installation ......................8 Assembling the NGT-12.5 ......................9 Dual Tangent Arm System ....................... 11 Balancing the Telescope ...................... -
Page 4: Introduction
Introduction The NGT (Next Generation Telescope) is the result of eight years of research and development, representing a radical departure from current trends in commercial telescopes. Rather than follow traditional paths in telescope design, we have explored new territory and adopted new designs whenever they have advanced our goals of precision, stability, portability and ease-of-use. -
Page 5: Warning
16 for further information on collimation. Optional Accessories The following accessories extend the capabilities of your NGT-12.5. They can be ordered at any time, and you will find them easy to install. Nose Assembly Light Baffle A slide-on nose extension to prevent stray light from entering the focuser. It also helps slow the advance of dew (recommended for dew plagued sites if no dew removal device is present). -
Page 6: Specifications
12 volts DC (direct current) The NGT-12.5 may be powered by a portable source, such as the optional power pack or an automobile battery, via a cigarette lighter plug or from AC current via a 12 vDC 1000 mA transformer. The DC lighter plug and DC wall... -
Page 7: Uncrating The Ngt-12.5
Uncrating the NGT-12.5 Follow the steps below to uncrate the NGT-12.5. It is recommended that you review the instructions completely before beginning with step 1. 1. Remove the cardboard top from the shipping pallet. Remove the truss rods and any larger accessories. (You may wish to save the foam tubing that wraps the individual rods. -
Page 8: Packing List
Packing List Refer to this list as you unpack your NGT-12.5. We recommend that you check off each item as you unpack and ensure that nothing is missing before you begin to assemble your telescope. If any items appear to be missing, please contact your retailer or Jim's Mobile Incorporated (JMI). The original packaging material may be required to file any claims with the shipper so please do not discard it. -
Page 9: Assembling The Ngt-12.5
Assembling the NGT-12.5 Using the following steps, the NGT-12.5 can be easily assembled by one person. However, until you are comfortable with the assembly steps, we recommend that you have another person on hand to help. You can see photos illustrating the assembly and disassembly procedures on our web site at jmitelescopes.com (select Pictures on the... - Page 10 Upper ends of a pair of truss rods Lift the nose assembly into position to permit the truss rod thumbscrews to be threaded into the nose assembly feet. (Use one arm to support the nose assembly from the bottom end, and the other hand to thread the thumbscrews.) Determine which screw-hole level is appropriate to adjust the focal point of the scope (see below).
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Page 11: Dual Tangent Arm System
Balancing the Telescope The NGT-12.5 is designed to be balanced when all the standard accessories are in place. This includes the finder scope, two piggyback camera counterweights, three sliding truss-rod counterweights, the light shroud (or three extra sliding counterweights) and an eyepiece. When using a CCD camera, rotate the upper nose assembly until the camera is above the telescope, drop the sliding counterweights to their lowest position on the truss rods and attach the extra CCD camera counterweight to the bottom of the tub. -
Page 12: Electrical Connections
Power Cable A cigarette lighter cord is provided to permit connecting the NGT-12.5 to a 12- to 15-volt DC power supply (such as an automobile battery or portable power pack). A wall transformer is also included to provide 12vDC by connecting to a 110vAC/60Hz supply (220vAC/50Hz for appropriate destinations). -
Page 13: Using The Command Center
PEC was designed to compensate for the non-linear tracking of a worm/gear mechanism whose period is typically four to ten minutes. Because the NGT-12.5 design has no such mechanism, and its direct-drive period is approximately 80 minutes, PEC is neither necessary, nor practical. -
Page 14: If You Suspect Improper Tracking
"Racking" the Motors—Due to the unique dual-motor design of the right ascension drive system on the NGT-12.5, the two motors can occasionally develop some slack or backlash between them. -
Page 15: Maintaining The Ngt-12.5
Maintaining the NGT-12.5 The following maintenance routines will preserve the accuracy and reliability of your telescope and help prolong its life. Cleaning Front-Surface Mirrors Never wipe a dry mirror with a lens tissue or other material, as this will scratch the surface coating. -
Page 16: Collimating The Ngt-12.5
24 hours is recommended. If the fiberfill is not completely dry it can drip, leaving water spots on the primary mirror. Collimating the NGT-12.5 Collimating is the process of aligning the optical components of the telescope for optimum performance. When a telescope is in need of collimating, you are likely to note that a star in the center of the eyepiece field will not focus precisely and will appear to be non-circular (elliptical or fan-shaped) when the image is out of focus (i.e. - Page 17 Image visible in the sight-tube If the view does not match this description and illustration, then repeat the three adjustment steps until the view is correct. The Second Step in Collimating—Use of the Cheshire Eyepiece A Cheshire eyepiece is extremely useful for the next step in collimating, although the auto-collimator or star test can accomplish the same thing.
- Page 18 adjustment, again moving the bull's-eye toward the center of the annulus. Repea t this rotation until the bull's-eye is similarly placed toward the central dot in both positions and as close to the center as possible. Then, rotate the nose assembly 90°...
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Page 19: General Maintenance
Use of the Star Test You can use the star test procedure to make adjustments to the primary mirror. The following method was suggested by Chris Jones of Essex, England. Use the sight-tube to align the secondary mirror as described above. Rotate the nose assembly until the focuser is vertically above a collimating bolt (this is not essential, but makes the process easier). - Page 20 JMI Telescopes Jim's Mobile, Inc. 8550 W 14th Ave Lakewood, CO 80215 USA 303-233-5353 Fax 303-233-5359 info@jmitelescopes.com...
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