SWR METER QRP
More info: http://ludens.cl/Electron/swr/swr.html

Input power: max. 2W
Frequency:1-1500MHz (use neinductive resistors, good shielding, BNC or N connectors & Schottky diodes)
Precision is very good!!!



SWR = (1+p) / (1-p)   where p is the position on the meter scale, ranging from 0 to 1.

For 75 ohm system use R1...R6=150 ohms.