Caddx FPV Air Unit User Manual

Caddx FPV Air Unit User Manual


Congratulations on purchasing your new CADDXFPV product. The information in this document affects your safety and your legal rights and responsibilities. Read this entire document carefully to ensure proper configuration before use. Failure to read and follow instructions and warnings in this document may result in serious injury to yourself or others, damage to your CADDXFPV product, or damage to other objects in the vicinity. This document and all other collateral documents are subject to change at the sole discretion of CADDXFPV. Visit for the latest information for this product.

By using this product, you hereby signify that you have read this disclaimer and warning carefully and that you understand and agree to abide by the terms and conditions herein. You agree that you are solely responsible for your own conduct while using this product, and for any consequences thereof. You agree to use this product only for purposes that are proper and in accordance with all applicable laws, rules, and regulations, and all terms, precautions, practices, policies, and guidelines CADDXFPV has made and may make available.

CADDXFPV accepts no liability for damage, injury, or any legal responsibility incurred directly or indirectly from the use of this product. The user shall observe safe and lawful practices including, but not limited to, those set forth in this document.

Notwithstanding the above, your statutory rights under applicable national legislation are not affected by this disclaimer.


The CADDXFPV Air Unit is an advanced video transmission module that supports a 5.8 GHz digital video signal and 720p 120fps image transmission, with a transmission range of up to 4 km and a minimum end-to-end latency within 28 ms*. The air unit can be mounted on a racing drone and used with DJI FPV Goggles or a remote controller to transmit video, control signals, and flight controller information wirelessly.

Caddx FPV Air Unit User Manual - Product Overview

  1. MMCX Antenna Ports
  2. 3-in-l Port
  3. USB-C Port
  4. microSD Card Slot
  5. Link Button
  6. Linking Status Indicator
  7. Camera

* The end-to-end latency is the total time from camera input to screen display. The device is able to reach its minimum latency and maximum transmission distance (FCC) in a wide open area with no electromagnetic interference.


Refer to the illustration below to mount and connect the air unit to a racing drone.

Caddx FPV Air Unit User Manual - Refer to the illustration

3-in-l Cable (Power, OJI HDL, UART)

Caddx FPV Air Unit User Manual - 3-in-1 Cable

  • 💡 An electric soldering iron and soldering tin are required for connection. Make sure that there are no short circuits or open circuits when soldering the cables.
  • There are up to eight channels for the air unit depending on the region (FCC: eight, CE/SRRC: four, MIC: three). Each channel has a bandwidth of 20 MHz. The public
    channel is 8, which is the default channel when the equipment ls powered on. The channel can be changed manually to avoid interference from other devices.
  • ⚠ The air unit may become hot during or after operation. Do Not touch the air unit before it cools down.
  • DO NOT use the air unit for an extended period when the temperature is high or there is poor ventilation. Otherwise, the air unit may overheat and enter low power
    mode which will affect its performance. If the air unit enters low-power mode, restart it or wait for it to cool down and it will automatically return to normal.
  • Keep the antennas of the air unit at least40 mm apart. Keep the air unit away from metal objects or carbon fiber frames. Make sure to choose a position where the
    transmission will not be blocked during flight.


When powered on, connected the air unit to your computer and run DJI ASSISTANT™ 2 for activation.
Download DJI Assistant 2 at


The air unit support three linking methods: A, B, and A+B (Must link A before B).

Caddx FPV Air Unit User Manual - The air unit support three linking

  1. Power on the air unit and the OJI FPV Goggles.
  2. Press the link button on the air unit and the goggles.*
  3. The linking status indicator of the air unit turns solid green.
    The goggles stop beeping when successfully linked and the video display is normal.

Caddx FPV Air Unit User Manual - The linking status indicator fo the air unit turns solid green

  1. Power on the air unit and the OJI FPV Remote Controller.
  2. Press the link button on the air unit, and then press the record button, C button, and right dial on the remote controller simultaneously.*
  3. Both the linking status indicators turn solid green when successfully linked.

* When ready to link, the devices will give the following indication:
Air unit: the linking status indicator turns solid red.
Goggles: the goggles beep continually.
Remote controller: the remote controller beeps continually and the status indicator blinks blue.

OSD display settings

Caddx FPV Air Unit User Manual - OSD Display Settings

  1. After connecting the UART cable to the flight controller. take the Betaflight flight controller software setting as an example. Open the corresponding UART port and click save.Caddx FPV Air Unit User Manual - After connecting the UART Cable to the Flight controller
  2. Select telemetered and save.Caddx FPV Air Unit User Manual - Select telemetered and OSD
  3. Select the display content you need in the OSD page (some OSD are not supported, please wait for subsequent updates)Caddx FPV Air Unit User Manual - Select the display content you need in the OSD page
  4. Select Settings-Display-Custom OSD ON in OJI FPV Goggle.

Operating channel

Caddx FPV Air Unit User Manual - Operating Channel

Make sure you fully understand and abide by local laws and regulations before using this product. An amateur radio license may be needed in FCC regions when using channels 1,2,6,or 7, as they are amateur frequency bands. Users who use the amateur frequency bands with a modified or cracked version or without a license may be punished for breaking local laws or regulations.


Weight Air Unit(Cam not included): 31g
Antenna: 3.74 g (MMCX straight );
3.9 g (MMCX elbow);
6 g (reverse polarity female SMA)
Dimensions Air Unit: 44X37.8X 14.4 mm
Coaxial Cable: 110 mm
Operating Frequency 5.725-5.850 GHz
Transmitter Power (EIRP} FCC/SRRC: <30 dBm;
Min. Latency (end-to-end) Low Latency Mode (720p 120fps): <28ms;
High Quality Mode (720p 60fps): <40ms
Max. Transmission Distance FCC/SRRC: 4 km; CE: 0.7 km;
Video Format MP4 (Video format: H.264;
Audio format: AAC-LC)
1/O Interface USB-C, MMCX, 3-in-l port,
microSD card slot
Supported Flight
Control System
Beta Flight
Operating Temperature Range 0°to 40° C (32° to 104° F)
Input Power 7.4-17.6V

Camera parameters

Model Caddx cam
Weight 8g
Dimensions 20.7X l9X l9mm
Image ratio 16: 9/4:3
Min. Latency 720p 120fps < 28ms
720p 60fps < 32ms
Sensor 1/3.r CMOS
Shutter: Rolling shutter
ISO: 100-25600
FOV 150° (D);l22° (H) ;93° (V)
Model Polar cam
Weight 9 g
Dimensions 24 X l9 X l9mm
Image ratio 16: 9
Min. Latency 720p 60fps < 32ms
Sensor 1/1.8″ CMOS
Aperture: F/1.6
Shutter: Rolling shutter
lso: 10D-2560D
Min. Illumination: O.D0003Lux
FOV 162″(D};l38°(H);75°M

Menu board

Polar camera supports menu board adjustment, this function needs self-soldering, please be CAREFUL not to damage the camera structure during welding.

  1. Remove the screws of the back cover. Remove the nylon spacers.Caddx FPV Air Unit User Manual - Remove the screws of the back cover
  2. Solder the menu wire and the gnd wire. Install the back cover. Connect the 050 menu board.

Caddx FPV Air Unit User Manual - Solder the menu wire and the gnd wire

  1. Left/Right button
    Control the increase or decrease of saturation.
  2. Up/Down button
    Control the increase or decrease of brightness.
  3. Middle button
    Short press to save, long press for 3 seconds to restore factory settings.

* Menu board needs to be purchased separately

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Caddx FPV Air Unit User Manual - QR Code

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