Question
What is the main carrier frequency used by KNX RF in Europe?
Answer
B — 868.3 MHz
KNX RF operates in the European ISM band at 868.3 MHz, which is lightly used and licence-free. The encoding is Manchester at a nominal rate of 16.384 kbit/s. Choice A (433 MHz) is used by other low-power systems (some remote controls, weather stations). Choice C (2.4 GHz) is the Wi-Fi/Zigbee/Bluetooth band. Choice D (5.8 GHz) is a higher Wi-Fi band, unrelated to KNX RF.
Preparation tip
Associate KNX RF with the 868 MHz ISM band — confusing it with 433 MHz or 2.4 GHz is the most common trap on this topic.
All proposed choices (exam context)
- A.433.92 MHz
- B.868.3 MHz✓
- C.2.4 GHz
- D.5.8 GHz
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