How we worked it out
Updated as you change the numbers.
- Γ = √(reflected ÷ forward). SWR = (1 + Γ) ÷ (1 − Γ). Return loss = −20 log Γ.
Method and assumptions
An SWR under 1.5:1 is generally considered a good match; most transceivers reduce power above about 2:1.
Questions
What SWR is 100 W forward and 4 W reflected?
1.5:1.
Sources
Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.