VRX Ground Unit Quick Start Guide

Connect the VRX ground unit to goggles and a Stinger for first use.

Table of contents

1. Quick Start Videos
   1. VTX/VRX Out of Box Experience
   2. VTX/VRX Changing Encryption Keys
   3. Example Video Stream
2. Hardware Overview
   1. Interfaces
   2. Buttons
   3. USBC-to-HDMI Adapters
   4. Battery/Power Supply
   5. Antennas
3. System Overview
   1. Pairing/Binding with VTX
   2. Changing Channels
   3. RF Occupancy Scanner
   4. Generating New Encryption Key
   5. Using New Encryption Key
4. Software Overview
   1. Default Settings
   2. OSD

Quick Start Videos

VTX/VRX Out of Box Experience

VTX/VRX Changing Encryption Keys

Example Video Stream

Using Orqa FPV.One to pilot a Stinger Vision FPV using RA01 antenna option, eg. X2-AIR 5.8 MKII.

Hardware Overview

Interfaces

Buttons

For the secondary functions, hold the Function Key (3) first, then press the other button. The order matters: pressing Record first starts a recording instead.

USBC-to-HDMI Adapters

The following has been successful in our testing:

• 201388-GRY (included in K1 kit)

Battery/Power Supply

2S-6S supported, ~7W max usage

Antennas

• M10001129 - Antenna, X2-AIR 5.8 MKII, RHCP, RG316 cable, SMA, 300mm
• M10001130 - Antenna, X2-AIR 5.8 MKII, RHCP, RG316 cable, SMA, 400mm
• M10001136 - Antenna, 4.9-5.9Ghz, 5dBi, Linear, Whip, SMA, 44mm

Drone Side:

• M10001112 - 5.8 Core: RHCP 160mm RG137 U.FL Antenna
• M10001114 - 2.4 Singularity: RHCP 160mm RG137 U.FL Antenna

System Overview

Pairing/Binding with VTX

VTX and VRX should “pair” when both powered up by default as shipped from the factory.

Cool use cases (and things to be aware of when powering on multiple units at a time):

• Multiple VRXs can be “paired” with a single VTX, allowing for multi view drop from a VTX
• Multiple VTXs can be configured on different channels, and a single VRX can swap between channels to stream from multiple VTXs.
• VRX can be configured to receive IP from the UAS over VPN offering low latency stream

Changing Channels

Use buttons 1 and 4 shown above to step through channels to locate streams from VTX systems using the same encryption key. A single press moves one channel. A double-tap starts a continuous scan in that direction, and the next press stops it.

RF Occupancy Scanner

With voxl-vtx 3.1.4 or newer (SDK 1.8), hold the Function Key (3) and press button 1 or 4 to open the RF occupancy scanner. It sweeps the band and shows the occupancy and noise floor of each channel on the OSD. While it is open:

• Buttons 1 and 4 move the selection (hold to scroll).
• Button 2 tunes to the selected channel and closes the scanner.
• Button 3 closes the scanner without changing channel.

The scanner is available when the VRX receives over RF (enable_pcap, the default) and closes on its own after a period with no button presses.

Generating New Encryption Key

If you want to change the encryption keys from the default, you can generate new ones and then use them on VTX systems to “pair/bind”.

To generate a new key, have:

• the VRX powered on
• a USB flash drive inserted into the USB port

Hold button 3 (Function), then press and hold button 2 (Record), and keep both held for about 1 second to provision the USB flash drive with a new key.

Using New Encryption Key

Power cycle the VRX with a provisioned USB flash drive inserted into the USB port.

Software Overview

The VRX Ground Unit runs the VRX SDK (current release ubun2.0-multi_SDK_1.8.0.tar.gz). Run the same SDK version on the VRX and the drone: a drone on SDK 1.8.0 (voxl-osd 1.2.0 or newer) needs VRX SDK 1.8.0. Stinger ships with SDK 1.8.0.

See VRX Ground Unit Developer Guide for more details.

Default Settings

VTX and VRX ship with default:

• frequency set to 5.805 GHz
• encryption key, to generate new ones (recommended) see above

OSD

To access the OSD menu:

Example of the current OSD menu: