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4. Coordinate System
. The Push+ uses two encoders, one on each axis. They measure angular changes to the telescope’s position
and “pass” this information to the electronics. These are relative changes, meaning that the Push+ must be calibrated for every observing
session - during the session as well -to a known set of objects to “know” where it is pointing-to. The two altitude and azimuth relative axial
positions are transformed into signals that can be interpreted by a dedicated planetarium App. The App will then, based on the current
time and location, transform this coordinates into night-sky coordinates. To get the best performance these two altitude and azimuth
coordinates need to be orthogonal to the ground where the Push+ sits. So making the mount horizontal is very important to achieve good
results.
Important: The mount should be horizontal so that the encoder system is orthogonal to the ground!
4.1. Making the mount horizontal to the ground.
To obtain the best pointing precision we recommend making the mount
horizontal. Place the Push+ on a good-levelled ground to place the Push+. An inclined driveway should be avoided! Place a bubble level
(builders bubble level not supplied) on the Push+ disc. The level should point to the centre (az-axis) and to one of the plastic foot-set.
Rotate the foot-base (part 10) if necessary so that the bubble shows horizontal levelling – figure 4. Now, without touching the level, rotate
the Push+so that the level is aligned with the next foot-set – figure 5. Adjust the foot-base if necessary. Proceed likewise to the last of the
foot-set, this one should confirm that the base is levelled. Repeat if necessary until a good horizontal base is reached. Make sure at this
point:
1. Mount is levelled;
2.Optical tube fixed to the Push+;
3. Push+ is powered (red LED blinking).
You are now ready to go to the next step.
5. Preparing the Push+ to be used with a device and dedicated App.
The Push+ alone cannot point to a sky object. The Push+ is only the encoder and the integrated Bluetooth®
transmission systems. One still needs a device – smartphone, tablet or computer and an app.
The smartphone or the computer are used to work as a display for the software that will use the relative
encoders positions to point the telescope to a target. One of the most popular software for telescope control
is SkySafari. This is a planetarium app that works virtuously with every telescope system. Push+ is also
compatible with many other software or apps. We will continuously update about software compatibility.
Please check our website for software updates and firmware updates.
6. Push+ compatibility. Push+ is compatible with devices that use
Android® or with computers that use Windows® operating system.
The devices must also be Bluetooth® 2.0 (or higher) compatible. The
following logos apply.
Android® logos and symbols are trademarks of Google Inc.
Microsoft ® and Windows ® are registered trademarks of Microsoft Corporation.
Bluetooth ® is a trademark of Bluetooth SIG Inc.
