Controlling UNIFY PRO VTX with SmartAudio
After the Sept. 2017 firmware update, the CROSSFIRE RX Micro V2 (DIVERSITY RX not supported) can be
directly connected to a TBS UNIFY PRO video transmitter and be controlled using our SmartAudio
technology. SmartAudio provides UART and I2C control for your video transmitter. Parameters such as
output power, bands, channels and frequency can be freely controlled. This enables remote channel
control directly from your radio (TBS CROSSFIRE OLED display, TBS TANGO with TBS CROSSFIRE or OpenTX
compatible remote), from the OSD (e.g. TBS CORE PRO) or, in a future release, a smart device/mobile (TBS
CROSSFIRE TX with bluetooth or wifi module required).
The setup is easy and simply requires the CROSSFIRE RX SIGNAL-pin and GND to be connected to the
UNIFY AUD and GND, respectively. You need to make a custom cable for this.
You also need to configure the CROSSFIRE RX channel mapping to output “SmartAudio” on output channel
4, see the “Configuration” chapter later on in this manual on how to access- and navigate the menu.
Antenna
The TBS CROSSFIRE components come with standard dipole antennas, these are perfect for normal flying.
Metallic objects, such as cables or handles, should be kept away from the antenna while it is in use, from
both the transmitter and the receiver.
The amount of clearance required is higher for lower frequencies than it is for higher frequencies. To
achieve the best range possible, the 900 MHz antenna needs to be almost 60% higher compared to a
normal 2.4GHz setup. In normal use try to hold the radio fairly high off the ground and with the antenna
vertical, without straining yourself of course. This is also a good technique you can use to quickly improve
the RF transmission if the link is about to fail or you briefly lost the signal. Standing on a hillside or on top
of a slope also helps to improve the conditions and range.
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