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FSK Configuration

Hi everyone,

I've been using the SX1272 in FSK mode, and it works fine with the configuration
#define FSK_FDEV 25000 // Hz
#define FSK_DATARATE 50000 // bps
#define FSK_BANDWIDTH 50000 // Hz
#define FSK_AFC_BANDWIDTH 83333 // Hz
#define FSK_PREAMBLE_LENGTH 5

But packet loss is caused when I try to set other FSK configuration
#define FSK_FDEV 100000 // Hz
#define FSK_DATARATE 300000 // bps
#define FSK_BANDWIDTH 250000 // Hz
#define FSK_AFC_BANDWIDTH 250000 // Hz
#define FSK_PREAMBLE_LENGTH 5


Any right configuration about FSK use datarate 300K?
Thank you so much!