3. Test
Please make sure the tripod is securely set up, and its legs are well tightened. Then power on the
AAT.
Normally, the tilt angle will return to the horizontal 0 degrees (pointing to the horizon), and the
AAT will be rotate several times for initialization. The following information will be displayed on
the OLED screen of the Crossbow AAT:
GPS: 12 (Batt:12.1V)
DIST:N/A
Alt: N/A
AZim: N/A
VLink: 0%
Dir: 0
Main Screen Descriptions
Display Item
Description
GPS/LocalGPS
Batt
GPS Satellites locked. If an external GPS is connected, GPS/LocalGPS will
be displayed in 12/11 formation (GPS=12, Local=11)
Batt (Voltage of the main battery) will be displayed alternatively here.
Dist
Distance of the plane (Not Available before SetHome)
Alt
Altitude of the plane (Not Available before SetHome)
Azim
Azimuth of the plane (Not Available before SetHome)
VLink/DLink
Video/Data downlink quality. (in %, ref to the "Downlink" chapter)
Dir/EDir
Current heading diretion of the tracker.
If an external compass is connected, EDir will be displayed alternatively
When you get enough satellites locked (usually 8 or more), press the right button on the base to
SetHome for the tracker. With MFD AP/MFD Crosshair you can SetHome for your plane,
meanwhile the Home location of the tracker will also be set.
Once the plane flies to 10 meters away, the tracker will start to track.
Crossbow can work in 2 modes: Unlimited/450degrees.
In Unlimited mode the Crossbow AAT can rotate in one direction continuously.
In 450degrees mode, The tracker will rotate back 360 degrees when it reached its limits (to avoid
twisting cables between tracker upper rotating part and the ground devices. To use 450deg
mode, please turn the tracker manually to point to your favorite direction (the opposite direction
is rarely used in the flight). Then hold the right button of the tracker for 3 seconds or longer. The
heading direction of the tracker will be stored as the current favorite direction until power off.
The below diagram describes how 450deg mode works.
We assume that the plane is circling above the tracker in counterclockwise direction (Top view,
Look from the sky). The tracker starts from the point A. It rotates 360 degrees in CCW direction.