SWR Bridges rely on there being a measurable isolation
between the forward and the reverse direction. This
difference in port isolation is measured in dB and is
called return loss. A typical SWR meter has a return
loss of 20dB. If you do the math it turns out the
best SWR you can measure with a return loss
specification of 20dB is about 1.2:1. You can't
accurately measure an SWR of 1:1. Anything "below"
1.2:1 is within the measurement error of the meter.
So if the 2 meters are typical in terms of their
return loss they are actually in agreement as far as
their "accuracy" goes.
73 W9OY
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