If the characteristic impedance of the feedline differs from
the characteristic impedance of the calibrated SWR meter,
the indicated SWR will vary with length of feedline.

If the feedline is lossy, the transmitted signal SWR will
decrease between the antenna and the transmitter. All
feedlines have a certain amount of loss.

If common-mode current is present on the SWR meter case,
the SWR reading will vary because the meter has no fixed
ground reference.


Hi Cecil.

in the first case the meter measures an apparent SWR, whilst in the second case
it measures the real SWR (occuring at the measurement point).

For the third case, I am unable to figure out whether the meter reads an
apparent or the real SWR.

73

Tony I0JX