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in the Southern Hemisphere; the middle scale is used
to indicate the right ascension in Equatorial mode when
operating in the Northern Hemisphere; the lower scale is
used to indicate the azimuth angle when operating in Alt-
azimuth mode.
4.
The Dec. setting circle is divided into four quadrants of
90-degrees, used to indicate the declination (when mount
is operating in Equatorial mode) or altitude angle (when
operating in Alt-azimuth mode). Users should use the
proper segment when calibrating the Dec. setting circle.
3.3
Adjusting the R.A. Axis Elevation
(Latitude)
1.
Loosen the two altitude lock knobs located on the sides
of the mount (Figure 12).
2.
Locate the altitude jackscrew (Figure 13) and extend its
retracted handle. Use it to turn the jackscrew to set the
R.A. axis elevation to your location's latitude. Refer to the
latitude scale and pointer on the left side of the mount
(Figure 11b). (If you don't know your latitude, consult
a geographical atlas or look it up on the internet.) For
example, if your latitude is 35° North, set the pointer to
35. The latitude setting should not have to be adjusted
again unless you move to a different viewing location
some distance away.
3.
Stow the handle back in the jackscrew after the
adjustment, then tighten the two altitude lock knobs.
Note: It is normal to have slight elevation play on the Atlas
Pro AZ/EQ-G mount. The mount depends on the gravity of its
payload and its own weight to stay firm. Because of this, it is
recommended to end the elevation adjustment with an upward
movement. Whenever there is an upward over-adjustment,
lower the elevation first, and then crank the mount upward
again.
3.4
Setting the Mount to Alt-azimuth Mode
1.
Loosen the two altitude lock knobs (Figure 12).
2.
Remove the two knurled knobs from the left side of the
mount (Figure 14a). Put the shorter one into the lower
screw hole; keep the longer one for later usage. Notice
the "Alt-azimuth mode lock hole" in the R.A. axis housing.
You will align that hole with the screw hole to its left when
you orient the mount head in the alt-azimuth position in
the next step.
3.
Now crank up the R.A. axis with the jackscrew until it
reaches approximately 88 degrees elevation, at which
8
Altitude lock
knobs
Figure 12. The dual altitude lock knobs.
a.
b.
Figure 13. The altitude jackscrew with handle a) retracted, and b)
extended for turning.
Jackscrew
with handle
retracted
Handle
extended
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