MyFlyDream Crossbow AAT Manual de usuario
Crossbow AAT
Manual
V 1.1
2019-Aug-29
www.MyFlyDream.com
Precautions
Thank you for purchasing the MyFlyDream Crossbow AAT (Automatic Antenna Tracker,
hereafter referred to as Crossbow AAT).
Please familiarize yourself with this product and its operation method described in this
document. This product is a precision electromechanical device. Please read this document
carefully to prevent damage to the device and minimize the risks of damage to property or
people’s lives.
Please only use this device according to local laws, rules, and regulations. Its performance
may be affected by a number of factors such as but not only: Strong electromagnetic interference,
poor GPS status, etc. All these reasons can lead to unexpected results. All risks and consequences
resulting from the use of this product are borne by the user.
We reserve the right to continuously improve and improve the performance of our products,
so the content of this document does not necessarily match the specifications of your products.
Please download the latest version of this document from our website:
www.MyFlyDream.com/download/
1.Product Introduction
Crossbow AAT is designed for use with unmanned aerial vehicle (UAV) on-board antenna
system. Its purpose and objective is to point the antenna precisely in the current direction of the
aircraft thus allowing the video receiver to pick up the strongest signal possible at given distance
and other factors.
In order to obtain better signal reception quality, it is advised to use high-gain receiving
antennas. High-gain antennas are known for very narrow angles of effective reception.
For its successful operation, Crossbow AAT requires the flight data such as latitude and longitude
of the tracked target (UAV) at every given moment, as well as its altitude.
This is achieved by the following:
1. Transmitting information of the tracked target over a wireless analog video link from the
UAV to the ground station. For that, the UAV must be equipped either by a MFD Auto Pilot, or a
MFD Crosshair Auto Pilot, or in case a third party AP is used with a MFD TeleFlyTiny tracking
module.
ATTENTION: Using TeleFlyTiny module is possible with many third party flight controllers. MFD
does not guarantee that it works with any particular make or model of the autopilot, nor that it
will continue to work with any third party autopilot after its firmware or software is updated.
2. Transmitting information of the tracked target over a wireless High Definition video link
from the UAV to the ground station. For that, the UAV must be equipped either by a MFD Auto
Pilot, or a MFD Crosshair Auto Pilot, or a MAVLink-compatible Auto Pilot, or in case a third party
AP is used, an MFD TeleFlyTiny tracking module. The signal containing encoded tracking data
from the TeleFlyTiny module on the aircraft will be transmitted to the Crossbow AAT through the
serial port .
3. Transmitting information of the tracked target over a wireless digital data link from the
UAV to the ground station.
MAVLink protocol allows to transmit the information from the UAV through the digital radio link.
If the on-board system already includes the digital radio, and the flight controller that supports
MAVLink protocol, Crossbow AAT will be able to receive all flight information necessary to track
the UAV through the shared TXD line of the digital radio station.
4. For more specific applications requiring custom design of the signal transmission, please
contact MFD directly.
MyFlyDream Crossbow Specifications
Tracking Ability
MAX Pan-Speed
300deg/s
MAX Tilt-Speed
60deg/s
MAX Pan-Angle
Unlimited/450deg
MAX Tilt-Angle
-15deg~135deg
Mechanical/Electrical
specifications
Weight
2.6kg
MAX Tilt Torque
14kgf.cm
Operating
Voltage
12~16V DC
Power
Consumption
< 15W (Typical)
Protocol Interface
MFD VBI
All MFD Autopilots/TeleFlyPro/TeleFlyTiny
supported
MAVLink
MAVLink V1.0/V2.0 supported
2.Installation and wiring
1. The AAT can be fixed on the head of a regular camera/camcorder tripod by the means of a
standard 1/4-20 threaded interface at the bottom of the main unit. Make sure the tripod you use
is capable of supporting the size, weight, and leverage of the battery+AAT+Antenna assembly.
Correct choice of a tripod is the user’s responsibility. Please make sure that the quick release
plate of the tripod is compatible with the threaded interface on the bottom of the AAT main unit.
Appendix B. shows details of the mounting interface of the AAT.
Crossbow AAT requires =12V to 16V (3S~4S) DC power supply. The recommended power supply
solution is 2 x NP-F980 batteries (7.4V 6600mah).
The tracker is powered on by simply plugging the XT60 connector into the corresponding power
socket of the AAT, as shown in the picture:
2. The antenna has to be mounted on the Crossbow AAT with the use of a special bracket.In order
to prevent tampering with the normal operation of the compass built into the Crossbow AAT it is
recommended to avoid using antennas made with ferromagnetic materials. Wherever possible,
use non-magnetic stainless steel bolts, aluminum and other non-magnetic materials.
3. There is an aviation-socket on the main unit(the upper connector), and a cable with aviation-
plug and color coded wires.
Please connect it to your equipments(DataRadio, VideoRX... etc) using the following color coding
diagram:
Upper Connector Cable Color Definition
Pin#
Wiring Color
Definition
1
Red
12V~16V power supply (shared AAT power supply voltage)
2
Yellow
Analog video input
3
Gray
External GPS RX (U2 RX). This pin maybe not available in later version.
The UART2 has been move to the top of the LEFT ARM of Crossbow.
4
Orange
Telemetry Data TX(U3 TX)
(connected with RX of your DataRadio)
5
Blue
Telemetry Data RX (U3 RX)
(connected with TX of your DataRadio)
6
Black
Ground
If you wish to use MAVLink protocol to provide tracking data through digital radio link:
Fix the digital radio link on the antenna bracket.
Connect the black wire of the plug cable to the ground wire of the digital radio link. Connect the
red wire to the power wire of the digital radio link.
ATTENTION: Voltage supplied via the red wire(=12 to16V) may be different from the digital radio
needs. Please use a suitable power conversion module if the digital radio power voltage is
different from the above mentioned.
Connect the TX (data output line) of the digital radio link to the green line of the cable.
Power on the digital radio link.
Usually, the UAV ground station also needs to be connected to the digital radio link. Sharing the
TX line of the digital radio link with Crossbow AAT will not affect the normal ground station
operation.
4. The base of the AAT has 2 similar aviation-sockets for use with 2 matching cable with a
aviation-plugs and color coded wires. If the analog video signal is fed to the socket mentioned in
clause 3 (right above), this video signal can be obtained from the green line of the socket on the
base after passing through the internal slip ring.
Lower Left Connector Cable Color Definition
PIN#
Wiring Color
Definition
#1
Orange
Telemetry Data TX(U3 TX)
(connected with RX of your DataRadio)
#2
Blue
Telemetry Data TX(U3 RX)
(connected with TX of your DataRadio)
#3
Red
12V~16V power supply (shared AAT power
supply voltage)
#4
Gray
Not Connected
#5
Yellow
Analog video output
#6
Black
Ground
Lower Right Connector Cable Color Definition (Not RF version)
PIN#
Wiring Color
Definition
#1
Orange
Not Connected
#2
Blue
Not Connected
#3
Red
Not Connected
#4
Gray
Not Connected
#5
Yellow
Analog video output
#6
Black
Ground
There is also a Crossbow RF model which uses a RF-Slipring inside. With this RF version, users
can mount their antenna on the tracker and access the signal(Up to 3GHz) with the lower N-
Connector of the Crossbow. The RF model looks a little bit different:
5. Choose the GPS+Compass module to get better tracking performance:
The Crossbow will recognize the GPS+Compass module once it's plugged. The screen will display
something like GPS:12/L14 to show the number of satellites locked by remote GPS/ local GPS.
With this module, The tracker will start to track when it locks enough satellites without setting
home operation.
Tabla de contenidos
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