Video, flight control, and a cellular link past the horizon
Inspection, mapping, delivery, and crop spraying all ask an industrial drone to fly beyond visual line of sight (BVLOS). WiFi video stops at the horizon and at whatever else is on that channel. A 4G or 5G cellular module carries video and the flight-control link farther, with less delay, so the ground station can telemetry and command the aircraft. SimtoLink modules for this work cover 4G and 5G, with an industrial design and UART and SPI. The company supports 500+ enterprise customers and has connected more than 10 million drones.
Where the cellular link sits on a drone
Power lines, a mapping job, a last-mile drop, and a spray pass do not want the same bandwidth. The notes below are the usual flights, and the radio that tends to fit.
Power-line inspection
A drone on a transmission line or in a substation sends HD video and telemetry back over 4G as it flies. Defects can be marked, and an inspection report can be drafted from that pass, which is what a grid crew actually needs.
Mapping and a 3D model
Oblique imagery and an orthophoto are large files. A 4G or 5G module is what gets the raw set to the cloud in time to build a reality model or a digital twin.
Last-mile delivery
A delivery drone takes dispatch orders over 4G or 5G and reports where it is and how it is flying. Remote watch and an exception alert are what low-altitude logistics runs on.
Crop spraying
The track and the spray settings of a crop-protection drone go to the management platform through the module. Operators can total the area worked, keep a record for supervision, and hold the application to what the rules allow.
Security and emergency
Fire and search-and-rescue aircraft send video into the same command loop that is dispatching people. Uplink bandwidth is what keeps that picture HD while the incident is still moving.
Oil and gas pipelines
A long pipeline does not stay inside one operator's map. Inspection imagery comes back over 4G, and a handoff without a drop is what keeps the pass continuous when the aircraft crosses a region.
What the airframe asks of the radio
- Several radios, several operators: A flight that crosses regions needs a handoff across operators and bands, so low-altitude coverage does not break mid-pass.
- Bandwidth and delay: Video and flight control need 4G or 5G for end-to-end delay and uplink bandwidth, including live 1080p and 4K.
- Temperature and vibration in the air: −40°C to 85°C, plus vibration resistance, is what a high, outdoor flight actually puts on the board.
- Interfaces the aircraft already has: Flight control, the video path, and the gimbal speak TCP, UDP, or RTSP. The module should meet them there.
- From a prototype airframe to a fleet: The range covers 4G and 5G, with documentation, an SDK, and production supply for the airframe builder.
Which radio fits a flight
Bandwidth, delay, and how far the route runs do not line up the same way for a spray pass and a 4K inspection. Coverage where the aircraft actually flies, the video load, and cost should decide the module. Start from the rows below.
| Job | Radio | Why that radio |
|---|---|---|
| Power inspection, mapping, delivery | 4G | Live video, telemetry and command, coverage across operators |
| Ultra-HD video, low-delay flight control | 5G | High bandwidth, delay in milliseconds, an eMBB link |
| Crop-spray track reports | 4G | A middle bandwidth, cost and coverage in balance |
| Long inspection across regions | 4G / 5G | Several operators, several bands, a handoff without a drop |
How SimtoLink fits a drone program
For aircraft, the modules are industrial designs that hold temperature and vibration, with technical support around the clock. 4G is the recommendation when power inspection, mapping, or delivery needs live video. 5G is for ultra-HD video and for flight control that cannot wait.
An airframe team gets the AT command set, the SDK, and sample code with the module, and one person stays on the account through the bench flight and the production lot. Chip questions go to the vendors SimtoLink already works with. As industrial drones and the low-altitude economy grow, that demand keeps growing, and the module line follows the radios those flights use. Supply is meant to continue after the first batch.
How a drone program usually moves
A practical sequence is:
The choice turns on the network where the aircraft flies (walk or fly a 4G/5G low-altitude coverage check), bandwidth and delay (video and flight control want both), and handoff between operators (a cross-region route cannot drop). Test the target airspace for signal, for how the handoff behaves, and for end-to-end delay. Video and flight control are usually better on 4G or 5G.
A 4G or 5G link takes a drone past the distance WiFi can hold, which is what BVLOS inspection, mapping, and delivery depend on, in power, surveying, agriculture, and emergency work. SimtoLink has supplied modules to drone makers, including operator handoff and work on low-altitude coverage.