[TowerTalk] Elementary feedline loss question

[Pete Smith N4ZR]

If I terminate a long 50-ohm coaxial cable with a 50-ohm dummy load, and 
put an MFJ-259B on the other end, and it reads R=56, X=0 at a given 
frequency, what is the mathematical relationship between the measured R 
(leaving calibration out of it, for now) and the loss in dB?

-- 
73, Pete N4ZR
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