Following image is from a measurement I did with a spectrum analyzer, configured to save the highest peaks.
The channel center is at 2.402 GHz and has a BW of 2MHz (2.401 - 2.403 GHz). The signal modulation is GFSK. I do know that, depending on the data, for 0 the offset from the center frequency is -f_o and for 1 it's +f_o (frequency_offset).
Am I assuming right, that the peaks @ 2.401 and 2.403 are transmitted 0's and 1's?