Reg Edwards wrote:

Reg, what about Rho = SQRT(P-/P+) and SWR=(1+Rho)/(1-Rho)?

It applies only to a long line lossless line which does not exist but
Zo must be 50 ohms.

Let's say we have the following system configuration with
a 1:1 choke at '+':

100W XMTR---50 ohm coax---+---300 ohm twinlead---...
Pfor1=100w-- Pfor2--
--Pref1=0w --Pref2

What's the forward power on the 300 ohm twinlead?
What's the reflected power on the 300 ohm twinlead?
What's the SWR on the 300 ohm twinlead?
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73, Cecil http://www.qsl.net/w5dxp