Amateur Extra › E4 Amateur Practices › E4B03
E4B03
Which S parameter is equivalent to forward gain?
Pick an answer to check it.
Answer: C. S21
S21 is the signal coming out of port 2 compared to the signal going into port 1, which is forward gain. S11 is input reflection and S12 is reverse gain.
Tip: S21: in at 1, out at 2 = gain.