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DFM Engineering, Inc.
1035 Delaware Ave. Unit D
Longmont, CO 80501
Phone: 303-678-8143
Fax: 303-772-9411
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Middlebury College Installation
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A new DFM 24-inch computer controlled telescope was
installed on top of Middlebury Colleges Bicentennial
Hall in Middlebury, Vermont. The telescope featured
many of the instrumentation options DFM offers.
The 24-inch telescope was completed and tested in Colorado
in January. The DFM team installed the telescope at
Middlebury College in early February.
On Monday the DFM installation team met with Middlebury
faculty and staff and got oriented at Bicentennial Hall.
Bicentennial Hall is a beautiful new building and it
was a pleasure to work there.
Tuesday, after carefully planning the lifts with the
crane driver and the campus engineer, the actual lifts
and setting of the large pieces of the telescope required
only a few hours.
On Wednesday, the assembly of the new telescope had
begun in earnest. Since DFM thoroughly tests each telescope
before installation, assembly on site is routine.
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Thursday, after the installation of the optics was
complete, the DFM team proceeded to work on the Finder
Telescope, Guide Acquire Module (GAM), Dome controls,
and TCS remote station.
Friday began with the adjustment of the primary drives
and progressed into the final testing all of the peripheral
instrumentation ordered with the telescope.

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Middlebury purchased just about every option DFM Engineering
offers, including: Azimuth dome control, the remote
controlled version of the imaging guide acquire module
with motorized off-axis guiding, the DFM remote monitor
and keyboard in the dome, and a GPS receiver for setting
TCS time.
Sunday night was clear and cold (-10F). It was a beautiful
night with Venus shining brightly in the West and Jupiter
and Venus overhead. The final testing phase began with
finding focus in the main optics and alignment of the
finder telescope.
After several hours of testing and moving the telescope
pedestal in Azimuth and Elevation, work began on testing
the DFM pointing model.
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A data set was taken which allowed the
DFM team to determine the residual Azimuth and Elevation
misalignments which were mechanically removed.
After a few more pointing runs the
expert DFM team was able to demonstrate RMS pointing
of better than 12 arc seconds, and confirm the tracking
performance of the telescope.
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The week of expert installation by the DFM team and
cooperation from the Middlebury staff proved to be very
successful. The installation checklist was approved
and, more importantly, the Middlebury faculty were very
pleased with their new telescope.
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