Tam/WB2TT wrote:
There was a big discussion about this last year, and somebody posted that
the ARRL was going to eliminate the conjugate reference.

Another problem that needs to be fixed is the difference between
the "virtual" rho and the physical rho. What is rho looking
into point '+' from the XMTR side?

XMTR---50 ohm coax---+---1/4WL 75 ohm coax---112.5 ohm load

The physical rho is (75-50)/(75+50) = 0.2 which is the same
as 's11' in an S-parameter analysis.

The "virtual" rho is SQRT(Pref/Pfor) which, in a Z0-matched
system is zero. (The 50 ohm coax "sees" a V/I ratio of 50 ohms)

Rho, looking into the load, is (112.5-75)/(112.5+75) = 0.2.

The virtual rho, looking back at point '+' from the load side
is |1.0| but that same reflection coefficient, s22 for an
S-parameter analysis, is (50-75)/(50+75) = -0.2.
--
73, Cecil http://www.qsl.net/w5dxp


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