8
BEFORE YOU LEAVE HOME
Since most of us must set up our instruments in the dark, in the cold or while battling mosquitoes, a bit of pre-planning and
organization is important. There are
few simple things that can be accomplished in the comfort of your home before heading
outside.
Gross Latitude Adjustment
The total latitude range of the 1200 mount is
approximately 21.5-68 degrees with 4 adjustment
positions.
Since most astronomers typically observe within
one latitude range, this adjustment is made just once, if at
all. Prior to shipment, we preset the mount to your latitude
range for your convenience. If you travel to another
observing location, determine the latitude of your
observing site and make the appropriate adjustment.
The four positions for the altitude adjustments have the
following approximate ranges:
55 degrees to 68 degrees latitude - top position
37 degrees to 59 degrees latitude - third position
28 degrees to 50 degrees latitude - second position
21.5 degrees to 37 degrees latitude - bottom position
How to change the position of the altitude adjuster bar
1. Use only the R.A. axis. DO NOT attempt the make
these adjustments with the declination axis in place and
certainly not with an instrument fully mounted.
2. Loosen both altitude-locking knobs about 1 turn.
3. Locate the side of the polar axis that does
not
have the
motor/gear housing box. Loosen (about 1 turn) the
polar axis pivot screw and altitude adjuster bar fixing
screws on this side only. With your hand, push the
polar axis upwards so that the altitude locking knobs
are positioned at the top of the altitude slot (this is the
maximum altitude position). Some resistance will be felt
with this operation since you are pushing against the
weight of the polar housing and the resistance of the
remaining polar axis pivot screw (which has not been
loosened).
4. Before attempting to move the altitude adjuster bar, you
must tighten the altitude-locking knob on the motor/gear housing side.
This will prevent any downward movement of the polar axis during
positioning of the altitude adjuster bar.
5. While supporting the altitude adjuster bar, remove the two screws that
support it on each side (4 screws in all), but keep the two ends of the bar
in contact with the side of the mount, don't remove it completely (this tip
is for your convenience).
6. Determine the latitude range that you need (refer to Diagram 3) and
position the hole that is marked “A” in Diagram 5 at that location. Note
that this hole is located at the rounded part of the altitude bar.
7. Attach two of the screws (one on either side of the adjuster bar), but do
not tighten. Rotate the altitude adjuster bar around this pivot point until
one of the other holes lines up. Insert the remaining two screws. Lightly
tighten so that you still have some ability to move the bar.
8. Note that the altitude adjustment knob is attached to a threaded rod that
travels through the altitude adjuster bar. Turn the knob so that the
altitude adjuster bar is positioned approximately in the middle of the threaded rod. You should see about half of
the threaded rod protruding from both
sides of the altitude adjuster bar. This will allow you to move the mount fully
within the altitude range.
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