[NLRS] Bi-directional or two uni-directional couplers

[Tod - ID]

The three replies so far to my query support my intuitive feeling about this
matter.

Donn expressed possible concern about what might happen if the "line length"
from two serial directional couplers became  significantly different from
the line length of a single bidirectional coupler.

Clearly the proper thing to do is to measure the value one gets with 'known'
impedances. It may be that one can use the same thinking as is present in
the QEX article to 'correct' for errors in the outputs of the two couplers. 

Thanks to the people who took the time to comment. I will go off and do the
measurements and see what I find.

Tod, K0TO