VSWR=(1+ | R |)/(1-| R |) r: For emission coefficient = ZL-Z0/ZL+Z0 ZL as input impedance, Z0 as ideal impedance

Echo loss:
RL = 10log (incident power / reflective power) 

dynamic range
Refers to the maximum and minimum power range allowed by the input signal. The lower limit is limited by the noise performance of the amplifier, and the upper limit depends on the non-linear index.