:EK...# simulating the pushing of the buttons on the telescope keypad. The buttons codes are given
in Appendix A. Assuming that pad is in initial state after power on, the sequence of the commands to
do correct collimation restoration is listed in the table. It reflects a navigation on AutostarII menu.
Table 1: The sequence of the commands to call “Collimation/Restore Default”
Command Button Command Button
1 :EK09# Mode 8 :EK68# Scroll down
2
:EK09# Mode 9 :EK68# Scroll down
3
:EK09# Mode 10 :EK13# Enter
4
:EK13# Enter 11 :EK68# Scroll down
5
:EK68# Scroll down 12 :EK13# Enter
6
:EK68# Scroll down 13 :EK68# Scroll down
7
:EK68# Scroll down 14 :EK13# Enter
Note that it is necessary to wait for the answer to each command, i.e. pause between two commands
must be at least 2 s, and starting after the last command the recovery procedure takes not less than
1.5 min. Telescope keypad may be disconnected.
5 Dew cap
All catadioptric telescopes have a weak spot: the corrector plate is located at the top of tube and
therefore is affected by fogging due to radiative cooling under clear skies. At high ground humidity,
which is often observed at the site of the installation of our telescope in the off-season, this problem
leads to the loss of a perceptible part of the observation time.
The design of the telescope provides a heater of corrector plate, but its efficiency is very low, since
the power of the heating element is small and it is located just on the edge of corrector plate, which has
poor thermal conductivity. Having considered the various ways to mitigate of fogging, we stopped at
the classic passive dew cap. However, since the space under telescope enclosure is small, we modified
its structure.
Because the combined instrument MASS/DIMM requires not all entrance aperture but only three
sections with a diameter of about 10 cm, our dew cap consists of a metal cap, put on the front edge of
the telescope tube with three octagonal tubes diameter of 10 – 11 cm and a length 15 cm The location
of these holes and tubes selected in accordance with the MASS/DIMM input apertures geometry.
After installing such dew cap in November 2007, the fogging problem was virtually solved. This
kind of blind (see Fig. 1 is somewhat inconvenient for the adjustment of the instrument and the
telescope, so it should be easily removed and installed again.
6
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