VRX Setup Guide

Runcam WifiLink Receiver

Warning

Do not connect power to the VRX if the HDMI cable is connected but the HDMI source is off — this may damage the HDMI output!

1. Connect DC 9–30V power and a miniHDMI-to-HDMI cable to your goggles or monitor.
2. Using the HID joystick you can change the communication channel (default 161 → 5.8 GHz).
3. Power on the drone and the VRX. By default both are set to channel 161 and resolution 1920×1080 — video will appear within 10 seconds.

💡 That's it! You can now fly on OpenIPC digital video.

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Additional VRX Settings

1. Accessing the WebUI

To change the VRX resolution (FullHD or HD), enter AP Mode (Wi-Fi access point): hold the joystick on the VRX until the screen shows "AP mode ON".

📶 A Wi-Fi network will appear: RadxaGroundStation 🔑 Password: radxaopenipc

After connecting, open your browser and go to:

http://radxa-zero3.local/

In the WebUI you can: • change communication channels • download or view DVR recordings • configure Adaptive Link • select resolution • view the RSSI graph

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2. Main WebUI Features

• DVR
• VRX Settings
• Camera Settings
• RSSI Graph (works when VRX and Air Unit are connected)

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3. Configuring Resolution

Go to Groundstation Editor → Screen-mode → Edit. Set the resolution, e.g. 1280×720 — it must match the Air Unit settings.

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4. Configuring the Communication Channel

Go to Groundstation Editor → wifibroadcast.cfg → Edit. Set a different channel (e.g. 140, 64, etc.) — it must match the channel on the Air Unit.

📡 5.8 GHz Channel Table (20 MHz)

Channel	Frequency (MHz)	Note
36	5180	Wi-Fi
40	5200	Wi-Fi
44	5220	Wi-Fi
48	5240	Wi-Fi
52	5260	DFS
56	5280	DFS
60	5300	DFS
64	5320	DFS
100	5500	DFS
104	5520	DFS
108	5540	DFS
112	5560	DFS
116	5580	DFS
120	5600	DFS
124	5620	DFS
128	5640	DFS
132	5660	DFS
136	5680	DFS
140	5700	DFS
144	5720	DFS
149	5745	No DFS (usually allowed)
153	5765	No DFS
157	5785	No DFS
161	5805	Most popular
165	5825	No DFS
169	5845	Non-standard
173	5865	Non-standard
177	5885	Non-standard

❗ What is DFS (Dynamic Frequency Selection): A technology that allows Wi-Fi or FPV devices to operate on frequencies that may overlap with military or meteorological radars. If radar activity is detected, the device automatically switches channels.

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5. Camera Settings (Air Unit)

Go to: Camera Settings → Load Current Config

• Wait for the settings to load from the camera
• Make your changes
• Save
• Restart Majestic

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6. RSSI Graph

The RSSI graph lets you monitor signal strength, link quality, and verify antenna placement and link stability in real time.

7. DVR

Download or delete your flight recordings.

8. Connecting Radxa to Your Home Network

Required software

1. Win32 Disk Imager
2. SD Memory Card Formatter
3. PuTTY (SSH)
4. WinSCP (FTP)

Initial Radxa Setup

1. Flash the Radxa image (v1.9.9) to a microSD card using Win32 Disk Imager.
2. Insert the card, connect a keyboard and monitor, disable Wi-Fi card power (⚠️ required).
3. Power on, log in via SSH (root/root).
4. Run nmtui → connect to your home Wi-Fi → reboot.
5. (Optional) AP mode → radxa-zero3.local → Web UI.

Camera Setup (Runcam WiFiLink v1/v2)

1. Connect the Ethernet cable to your router or PC (IP 192.168.1.10).
2. Open OpenIPC Configurator → Connect → select your camera.
3. Camera: Resolution (1920×1080 or 1280×720) → Bitrate (e.g. 12 228 kbps; with Alink — auto).
4. Telemetry: enable UART0 + Mavlink → restart.
5. Firmware: update firmware → Update.
6. Advanced: enable Alink → view logs.