ASTRO-PHYSICS GTO KEYPAD Installation and operating instructions
1
ASTRO-PHYSICS
GTO KEYPAD
Version 4.17 Addendum
Plus Supplemental Information for Customers Outside of North America
and the Revised GTO Quick Star Drift Method of Polar Alignment
KEYPAD VERSION 4.17
Version 4.17 Release Notes - 10-20-08
Version 4.17 replaces v.4.16 from 7-7-08 which had a bug that caused occasional random freeze-ups during
initialization of the mount, especially when resuming from Reference Park 1.
Version 4.16 replaced v.4.15 from 3-24-08 which had a bug that only affected older keypads – Serial numbers
1490GTO and earlier.
Eastern Longitudes
Eastern Time Zones When Polling the Mount
Shipping Notice
CONTENTS
2
Special Notice to Mach1GTO, 1600GTO and 3600GTO Owners
Summary of Remaining Keypad Issues:
Eastern Longitude Values
(see pp. 14-16)
3
Western Longitudes with Eastern Time Zones
(see pp. 14-16)
Please note:
Incorrect GMT Offsets When Polling the Mount from the Keypad
(see p. 44)
Western Longitudes at Time Zone Zero
(see p. 44)
4
Eastern Longitudes and Time Zone 12
Eastern Longitude Limit
(see pp. 14-16)
The International Date Line
Fractional Time Zones
COMMAND LANGUAGE / TROUBLESHOOTING UPDATE
Motor Stalls in GTOCP1 and GTOCP2s with the E1 or KE1 Chip
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Horizon Check in the Servo
Command: :ho# :hq#
Response: (none)
NO ONE SHOULD USE THE HORIZON CHECK
Variable Tracking
please take special note of the difference between the northern and southern hemispheres for these
commands.
Command: :RR sxx.xxxx# :RD sxx.xxxx#
Response: “1”
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REVISED GTO QUICK STAR DRIFT METHOD OF POLAR
ALIGNMENT
Using the Meridian Delay Feature and a Finderscope
Note the selection of suggested stars for this procedure in Appendix I
We suggest that you use these detailed instructions the rst couple times you perform this method.
After you are comfortable with the procedure, a single-page Quick Reference Sheet is also provided
for convenience.
NOTE: The diagrams below portray a hypothetical example to illustrate the concept.
Follow one of the start-up alignment procedures from earlier in the manual (one complete cycle) to get close.
Slew to a bright star that is within 1 hour of the meridian, either east or west, and as close to straight overhead
in the N-S direction as possible.
Be sure that your telescope is on the west
side of the mount when pointing to a star in
the east and vice versa.
Use the direction buttons to line up the
crosshairs of your nderscope’s eyepiece
Center the star
Press the RA/DEC/REV button; then select the #9=Re-calibrate
In the RA/DEC/REV menu look at the Meridian Delay selection.
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Choose the same star again, beginning from the Objects Menu, and press GOTO.
Make altitude adjustments.
The RA (east/west) error is a function of the
orthogonality of the nderscope.
Use the nerscope’s adjustment screws to
nish the movement onto the N-S crosshair.
Use the mount’s altitude adjustment to bring
the star half way toward the center of the
reticle in the N-S direction.
Center the star the rest of the way using the N-S buttons.
Press the Recal button #9 again in the RA/DEC/REV Menu.
Set the Meridian Delay display back to <0W>.
Enter the same star again and press GOTO.
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Make azimuth adjustments:
Pick a second star that is at least 40 degrees
away from the rst star, and that is away
from the pole.
Use the GOTO to slew to the second star.
Make THE ENTIRE centering correction with
the azimuth adjuster.
No need to Re-calibrate since you have NOT used the direction buttons to do any nal centering.
Slew back to the rst star (Altitude Adjustment Star).
If needed, center with the direction buttons only, and
then re-calibrate.
Repeat as needed.
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SOME HINTS & COMMENTS:
10
GTO Quick Star Drift Method of Polar Alignment Quick Reference Sheet
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