nRF24L01+ RF_CH bits

[brownt]

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

[UL7AAjr]

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

And some usefull table.

[mfalkvidd]

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

[UL7AAjr]

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

[bakcsa]

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.

[mfalkvidd]

@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.