433 MHz or 2.4 GHz? Choosing a Frequency for Crane Remotes
433 MHz penetrates obstacles better and is more stable over long distances; it is the standard choice for industrial cranes. 2.4 GHz offers higher data rate and is advantageous in systems that require proportional control.
Short answer: 433 MHz if on-off control is enough, 2.4 GHz if stepped (proportional) speed control is required. 433 MHz is a lower frequency, so it gets around obstacles better and is more stable in steel-structure environments. 2.4 GHz carries a higher data rate; when joystick position must be transmitted continuously, that capacity becomes the deciding factor.
Why do the two frequencies behave differently?
As frequency drops, wavelength grows and the signal travels around obstacles more easily. The wavelength of 433 MHz is about 69 cm, that of 2.4 GHz about 12 cm; this is why 433 MHz attenuates less behind walls, columns and metal structures.
The difference is a measurable quantity: at the same distance and the same antenna gain, 2.4 GHz drops roughly 15 dB weaker than 433 MHz.
In return, a lower frequency carries less data. On-off commands are small data, so this is not a problem. But transmitting the joystick's angle at every instant requires a continuous data stream — this is where the bandwidth of 2.4 GHz comes in.
Comparison
| 433 MHz | 2.4 GHz | |
|---|---|---|
| Wavelength | ~69 cm | ~12 cm |
| Quarter-wave antenna length | 172.7 mm | 30.7 mm |
| Obstacle penetration / diffraction | Good | Moderate |
| Stability in metal environments | High | Moderate |
| Data rate | Low | High |
| Suitability for proportional control | Limited | Suitable |
| Wi-Fi interference | Not affected | Can be affected |
| Typical use | Chain hoist, overhead crane | Proportional hydraulics, joystick |
Legal limits in Turkey
| Band | Maximum power | Duty cycle |
|---|---|---|
| 433.05–434.79 MHz | 10 mW e.r.p. | ≤ 10% |
| 2400–2483.5 MHz (narrowband) | 10 mW e.i.r.p. | — |
| 2400–2483.5 MHz (wideband data) | 100 mW e.i.r.p. | — |
A 10% duty cycle means in practice a maximum of 360 seconds of transmission per hour. Since a remote transmits as long as a button is held, commercial devices keep the average duty cycle below this limit through their packet structure.
When does interference become a problem?
The 2.4 GHz band is shared by Wi-Fi, Bluetooth and microwave ovens. In facilities with dense Wi-Fi infrastructure, channel overlap shows up as reduced range and dropouts. 433 MHz is outside that band; on the other hand there is a possibility of collision with other remotes using the same band. In both cases what prevents cross-talk is not the frequency but the devices' unique address code.
For antenna placement, the Fresnel zone and the entire installation side: Wireless Remote Installation: Pairing, Relay Wiring and Safety
For product selection: Wireless Crane Remote Selection Guide