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~ THREE DOB-DRIVER OPTIONS FOR THE ABOVE SYSTEMS ~
HRG-4x Research-grade high-resolution gearing option for systems above. Standard visual resolving ability with the above 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 simple 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 16" or larger aperture, heavier than 100 Lb total, 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, but increase the torque available to the telescope structure, by a like amount).
The HRG-4x option can be added or removed after the purchase of a Dob-Driver II system, at "This-For-That" with no extra surcharge if you decide to change within the 30-day trial period allowed for new orders - after you have done your "Test-Drives" on your instrument. Later than that and we must call the motor-gear unit "used" and you keep it and the prices are shown separately below for old upgrades.
The prices shown cover BOTH AXES, not just one or the other individually.
New system option HRG-4x: $88 Research resolution and torque typically 40ft-Lbs/0.25a-s.
Rebuild/upgrade old drives (Send drive units to Tech2000 for refurbish & checkout): HRG-4x: $268
DDR2-PCR PC-link interface w/ ROBOSCOPE disk, 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. 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 dynamically adapt each axis rate when a guider is active! DDR2-CCD $39
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