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--- rf_measurement [2023/11/08 13:09] – created river
+++ rf_measurement [2026/09/19 13:41] (current) – river
@@ Line 3: / Line 3: @@
 [[https://www.everythingrf.com/tech-resources/vswr|SWR / Return Loss Conversion Table]]
-Return Loss (RL) = 10 log_10(P_incident / P_returned)
+Return Loss: $RL = 10 log_{10} \frac{P_{incident}}{P_{returned}}$
-Always positive.
+Always non-negative.
-S11: called reflection coefficient. Good: large negative number.
+$S_{11}$: called reflection coefficient. Good: large negative number.
-RL = - reflection coefficient.
+$RL = -S_{11}$
+===== SWR =====
+Can be calculated as ratio of impedances, e.g. source 50R, load 75R - 50:75 - SWR 1.5.