Q: There is FSK Minimum Frequency Deviation for Gaussian Shaping of GFSK is ±10kHz in the datasheet . So please tell me the effect or issue when using it at 1.75kHz.
A: Modulation 1.75Khz, this is original signal bandwidth, it is not related to FSK minimum frequency deviation for Guassian shaping.
GFSK is a FSK method, in which a Guassian filter was set before FSK and behind original signal.
Guassian filter parameter modulation index (BT) will influence original signal, then influence frequency deviation of baseband.
After filtered, we should ensure frequency deviation larger than 10Khz.