nRF24L01+ RF_CH bits



  • I am confused by the channel bits (RF_CH) in register 0x05.
    why is there a '1' in bit 1. I guess it can't be used and so the range is
    00000010   - 2400MHz
    00000011  -  2401MHz
    00000110 (6) - 2406MHz ??????
    00000111 (7)

    The datasheet says the freq range is 2400 to 2525MHz but it also says Freq = 2400 + RF_CH MHz
    Which therefore makes the first channel (00000010) 2402MHz



  • RF_CH bits are used to select channel. Channel number and frequence calculated like this: F = 2400 + RF_CH.

    And some usefull table.

    alt text


  • Mod

    @ul7aajr which part of the world is that tabe for?



  • I suppose for Canada. Anyway, is better to avoid to use 0-82 channels. It's really noisy.



  • EU regulation is as following:

    Frequency band Category of short-range devices
    2 400 -2 483,5 MHz Non-specific short-range devices [3]
    2 400 -2 483,5 MHz Radio determination devices [9]
    2 400 -2 483,5 MHz Wideband data transmission devices [16]
    2 446 -2 454 MHz Radio Frequency Identification (RFID) devices [12]
    2 483,5 -2 500 MHz Active medical implant devices [1]
    2 483,5 -2 500 MHz Medical data acquisition [20]
    2 483,5 -2 500 MHz Medical data acquisition [20]

    Source and details here.
    It is very clear that only 2 400 -2 483,5 MHz can be used for these kind of sensors. Higher frequencies are used by medical devices.


  • Mod

    @bakcsa thanks for the nice source.

    Your observation is in line with the note in MySensors documentation that says the same channels are allowed in Germany.


Log in to reply
 

Suggested Topics

  • 1
  • 1
  • 10
  • 1
  • 2
  • 2

0
Online

11.2k
Users

11.1k
Topics

112.5k
Posts