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~ FOUR DOB-DRIVER OPTIONS FOR THE ABOVE SYSTEMS ~
HRG-4x Research-grade high-resolution gearing option for systems above. Standard visual resolving ability with Dob-Driver II drives is typically better than an arcsecond at the eyepiece during use on any common Dobsonian product that can deliver that performance level - which is fine for most all observation and regular imaging with this system. According to your aperture size (Dawes limit) and sky quality you would select this HRG option if the skies you are observing in can permit pressing deep into subarcsecond territory. Normally the elevation you have during observations will be the limiting factor for resolving power regardless of the instrument size or aperture. Tech2000 will advise using HRG4x on telescopes of 18" or larger aperture, heavier than 100 Lb tube assy., or on any telescope size intended for precision imaging.
Note this option causes a like reduction in slew speed which is mainly pertinent during a two-star beginning procedure if Roboscope is used (standard slew is typ. better than 4 deg/Sec on large scopes and 7 deg/Sec on 6-10" class - HRG 4x will reduce these slew speeds by 4, but increase the torque available to the telescope structure, by a like amount).
The HRG-4x option can be added after the purchase of a Dob-Driver II system with no extra surcharge if you decide to change the motor units/gearbox-modules within the 30-day trial period allowed for new orders. The price shown covers BOTH AXES, not just one or the other individually.
HRG-4x option: $188 Research resolution and torque typically 40ft-Lbs/0.25a-s at main axis.
DDR2-PCR PC-link interface w/ ROBOSCOPE disk, unlimited coordinate entry for millions of targets, plus over 13,000 goto-and-track objects by direct catalog number in the (Entire!) NGC, IC, Messier, King, Caldwell catalogs, and unlimited user catalogs created by you in 100-object blocks for private sky-tours or object groups etc. Use any sky chart at the same time on Win9x thru 2000 & XP, Robo can shrink to 1" and float around on your chart while you pick-off catalog numbers or coordinates at your leisure for millions of objects. All Ra/Dec entries too are valid from magazines or internet, software charts or paper charts, or your books - so long as the object is up in your sky (anywhere you are in the world) from horizon to zenith - Roboscope will know that and go get it and track it automatically. This is extra nice for comets and asteroids, geosynchronous satellites etc. etc. A CD is supplied unless you wish to have a 3.5" floppy disk instead at request. 14' cord to hand pendant from any PC parallel printer port or your parallel port adapter cord in case of no parallel connector available on your machine. This option can be added by the user later with a solder iron and a drill/carving procedure, or without any extra installation charge at Tech2000 whenever we have the hand control here - that's why its best done here at first.
DDR2-PCR $99 FOR ALTAZ MOUNTS ONLY! (Dobs or Giro heads etc.)
DDR2-CCD ST4-compatible CCD autoguider interface (6-wire RJ12 phone jack standard connection) to automatically stay ON TARGET with maximum accuracy during photo or visual use. This option can be added by the user later or without any extra installation charge at Tech2000 if you send us your hand control. All DDR2 drives will continuously dynamically adapt each axis rate when a guider is active for maximum precision and the lowest correction repeats - chasing your PEC problems invisibly! DDR2-CCD $39
EXTENDED WARRANTY Converts the standard 1-year warranty to 3-year warranty with certificate covering parts and labor 100%. Extending the confidence level of a 19-year manufacturing facility to a higher comfort zone allowance. This extended warranty does not cover custom part fabrications or other special modifications of a drive set if or when shipped as such.
WARRANT3-DDR2-ORDER# xxxx $99
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