CCS/IWR6843ISK-ODS: Vital Sign for chirp Bandwidth

Tool/software: Code Composer Studio

In Vital Signs 68xx Demo, the chirpBandwidth_MHz is calculated in MmwDemo_parseProfileAndChirpConfig() as below.

dataPathObj->chirpBandwidth_kHz = (48*profileCfg.freqSlopeConst)*(dataPathObj->chirpDuration_us );

But I don't know why it multiply 48.
I want to know is it OK if I change the code as below. 

dataPathObj->chirpBandwidth_kHz = (profileCfg.freqSlopeConst) * ((2.7*1e3*900) / (1U << 26))*(dataPathObj->chirpDuration_us );

Thanks!