Owen wrote:
Real instruments aren't of zero length, but some types of design are
so close to it at low HF frequencies, you will not detect the error
that is introduced.

The error that we are talking about has nothing to do with
the length of the directional coupler.

The error that we are talking about has everything to do
with an infinite error in the measurement of reflected power.
Infinite errors are hard to sweep under the rug.
--
73, Cecil http://www.qsl.net/w5dxp

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