Payload Integration
The repeater module is mounted to keep the UAV balanced while allowing access to antennas, wiring, and power connections.
The idea, made real.
The first generation of Vexil Systems aircraft: a drone-based radio repeater for search and rescue communication in obstructed terrain. Our first aircraft to fly, land, and relay. The airframe every Hermes decision was tested against.
UAV Platform Design
The UAV platform serves as the mobile foundation for the repeater system. Its purpose is to carry the communication payload to an elevated position, land on a stable surface, and maintain a relay point between teams separated by terrain.
Instead of relying on continuous hover, the system is designed around a landed relay concept. The drone flies above the obstruction, settles on a flat ridge or high point, and keeps the repeater positioned where the radio path is strongest.
- Mobile elevated relay point
- Landed operation to reduce power demand
- Payload layout designed for balance
- Antenna placement for VHF and UHF paths
- Simple deployment and recovery workflow
Landed Relay Operation
The platform is designed to land on an elevated surface so the repeater can operate without requiring continuous hover.
Power Efficiency
Landing during relay operation reduces drone power demand and helps extend the useful communication window.
Antenna Placement
The UAV layout supports clear VHF and UHF signal paths while keeping antennas away from major frame obstructions.
Field Deployment
The platform is built around quick setup, simple launch, stable landing, and easy recovery by search and rescue operators.
Stability and Balance
Payload position, center of gravity, and landing support are considered to maintain reliable flight and landing behavior.
Bridging the communication gap.
The repeater receives on VHF, retransmits on UHF at four watts, and runs landed so the battery goes to the radio.
Frequency Bands
VHF: 134 to 174 MHz
UHF: 400 to 480 MHz
Relay Endurance
30+ minutes per battery, landed
Transmit Power
4W