The LNA boosts the antenna sign to beat feed line losses among the antenna along with the receiver. To simplify the noise achieve calculation, the sounds sources in The straightforward amplifier circuit in Determine 1 could be minimized to just one overall RTI sounds source (Vni, Whole), as revealed in https://low-noiseamplifier90000.blogdun.com/37941540/the-definitive-guide-to-low-noise-amplifier