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By drastically reducing drive errors, the Telescope Drive Master puts
1 arc-second tracking ability within your reach without asking you to
give up your existing mount.
The Telescope Drive Master (TDM) is the vision of accomplished
Hungarian amateur astronomers, Istvan Papp & Attila Madai of MDA
Telescoop. It was their desire to solve the problem of tracking
imperfections that, to some degree or another, are inherent in all
equatorial mounts, and the Telescope Drive Master was the result. The
TDM is designed to attach to a range of popularly available equatorial
mounts through the use of a separately purchased mount-specific adapter.
The Telescope Drive Master™ uses an ultra-high resolution encoder and
an electronics package that transforms your drive system into a
super-performance, research-grade drive. This device does not require
tedious PEC training. Just turning on the TDM eliminates nearly all of
the periodic and non-periodic tracking error of your equatorial mount.
The TMD electronic controller unit compares the incoming signals from
the high precision rotary encoder, which is mounted onto the RA shaft,
with the time signal of its quartz oscillator. Any deviations of the
angular velocity of the RA shaft from the prescribed drive rate are
compensated by feedback regulation in real time by accelerating or
slowing down the drive. If further correction is needed because of
errors other than periodic drive error, the TDM allows auto-guider input
as well. A typical drive on a moderately priced equatorial mount can
easily have 20-30 arc seconds (or more) of periodic error. The TDM can
easily improve it down to 2-to-2.5 arc-seconds peak-to-valley - which is
what you would expect from equatorial mounts that cost many thousands
of dollars. In many cases, that number will drop even further to 1