How does 2.4 GHz frequency hopping prevent interference in the field?
Instead of staying on a single channel, frequency hopping systems continuously change channels within the band; when one channel is occupied by Wi-Fi or another transmitter, communication continues on the next channel. The HCT400 and HCT402 use the AXI-specific encrypted XRF protocol in the 2.4 GHz band and move to the safe position within 250 ms if the signal is lost.
The 2.4 GHz ISM band is open to shared use: Wi-Fi, Bluetooth, radio devices, and other machine remote controls share the same space. A system operating on a single fixed channel gets blocked when that channel is occupied.
The logic of frequency hopping: the transmitter and receiver change channels in a pre-agreed sequence. If there is interference on one channel, all that is lost is a very short time slice; communication resumes on the next hop. In Europe, the harmonized standard governing this band is ETSI EN 300 328, which limits RF output power to 20 dBm for frequency hopping devices and also places a 15 ms upper limit on cumulative transmission time on a single hop frequency.
On the remote control side, the second layer is encryption and session pairing: the joystick only commands the motor it is paired with. The third layer is the transition to the safe state. As soon as the link drops due to interference or going out of range, the 250 ms timeout takes effect, the motor returns to the safe center position, and oil flow stops.
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