Frequently Asked Questions

Should I choose 433 MHz or 868 MHz for a crane remote control?

For large open-site and long-range applications, 433 MHz provides better range and obstacle penetration. When multiple remote controls operate simultaneously on the same site and channel conflict is a risk, 868 MHz offers lower traffic density and reduced interference between systems. Both bands are licence-free under ETSI in Europe and are the standard industrial choice over 2.4 GHz for crane applications.

What is the difference between IP65 and IP67?

IP65 provides complete dust exclusion and protection against low-pressure water jets — sufficient for wet environments and rain exposure. IP67 adds short-duration submersion resistance (1 m depth for 30 minutes). For port, agricultural, or waterway-adjacent applications where the remote control may be fully wetted or temporarily submerged, IP67 is the appropriate specification. For standard outdoor industrial use, IP65 is the minimum.

Does operating a crane remote control without CE certification cause problems?

Yes — on two levels. Legally, CE marking is mandatory for industrial remote control equipment placed into service in EU-aligned markets; operating non-CE equipment creates regulatory liability and voids insurance coverage in the event of an incident. Practically, a unit that has not passed EMC testing may emit interference that causes unpredictable faults in PLCs, frequency converters, and other sensitive electronics in the same facility.

Why is FSK modulation more reliable than ASK in industrial environments?

FSK encodes data through frequency variation and is immune to signal amplitude fluctuations. Industrial environments — particularly those with motor inverters, welding equipment, and large transformers — generate significant amplitude noise that disrupts ASK-modulated signals. FSK’s amplitude independence means this noise does not corrupt the control signal. For any crane operating in a production or heavy industrial environment, FSK is the correct modulation specification.

What is the difference between nominal range and real-world range?

Nominal range is measured in open field conditions with no obstacles. In enclosed industrial facilities with metal structures, concrete walls, and dense machinery, this figure typically reduces by 30–50%. A remote rated at 100 m nominal range should be expected to deliver 50–60 m effective range inside a steel-frame workshop. Always specify at least 50% more range than your maximum required operating distance to maintain reliable signal at the working boundary.

What does dBm mean on a crane remote control datasheet?

dBm is the unit of RF (radio frequency) transmission power, expressed as decibels relative to 1 milliwatt. A higher dBm value indicates a stronger transmitted signal, which contributes to longer range and better obstacle penetration. In industrial crane applications, typical transmitter power is in the range of 10–25 dBm. dBm alone does not determine performance — modulation type, receiver sensitivity, and antenna design all interact with transmitter power to produce the effective operating range.

How many channels do I need for a facility with multiple cranes?

Each crane remote control system occupies one channel. In a facility with 10 active cranes, you need at minimum 10 available channels — and ideally a system with 30 or more channels to provide buffer capacity as operations expand. When total channel capacity is insufficient for the number of operating devices, cross-talk between remotes creates unpredictable crane behaviour. Establish the total count of all wireless devices on site before finalising channel count specification.

What is FHSS and when should it be specified?

FHSS (Frequency Hopping Spread Spectrum) is a transmission method where the signal continuously switches between frequencies within the operating band rather than remaining on a fixed channel. This makes the control signal highly resistant to both fixed-frequency interference sources and to channel congestion from other wireless devices. FHSS should be specified in facilities with heavy electromagnetic interference, dense wireless device populations, or where multiple crane remote controls operate in close proximity.

Does IP rating cover explosive atmosphere protection?

No. IP rating covers ingress protection against solids and liquids only — it does not address ignition risk in explosive atmospheres. For environments classified as explosive atmosphere zones (flammable gases, vapours, or combustible dust), ATEX certification is required in addition to the IP rating. These are separate standards with separate testing requirements. A unit carrying IP67 without ATEX approval cannot legally or safely be used in a classified explosive atmosphere zone.

Which battery type should I specify for a crane remote in cold storage?

AA alkaline batteries lose significant capacity below -10°C and are not reliable for cold storage applications. Li-ion or LiPo batteries maintain performance across a wider temperature range and are the correct specification for sub-zero operating environments. NiMH rechargeable cells perform better than alkaline in cold conditions but are still outperformed by Li-ion in extreme cold. Always verify the battery’s rated low-temperature performance against your actual operating temperature before specifying.