K7ITM wrote:


It will be valid if the Z0 of the line is uniform, and matches the
calibration of the instrument you use to measure it.

SNIP

It may be worth adding that even when
the line is neither uniform nor matched
to the impedance of the RLB, the
measured return loss will correctly
indicate the sum of losses due to the
mismatch and to the line losses.

When the line impedance is uniform, the
mismatch loss can be simply calculated
and the cable loss can then be found.

73,

Chuck

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