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StrangeBrew asked if you adjusted the SWR meter when you changed power levels.  That's very important.  "R" in "SWR" stands for "ratio" - a comparison of two numbers referenced to a common value, usually 1.


Most such meters compare the amount of forward power to the amount of reverse or reflected power and display that as "SWR".  It's close enough to use for just about all purposes.  BUT you have to establish the amount of forward power by adjusting the meter to the "CAL" mark on the scale - usually the line at the right-hand end of the meter scale. THEN, don't touch that control or the transmitter's output.  Just switch to the SWR or REFL function, key and read the meter.