> Can't argue with your analysis. My only point is that if you
> are intent on dealing with a
> TX to duplexer mismatch, a half wave cable replicates what
> ever mismatch exists. A
> random length cable can mask the real world condition by
> making the apparent mismatch
> better or worse than it really is.
Depends on how you're defining "mismatch". If you mean VSWR, then it
doesn't matter what cable length you use, it doesn't change the VSWR. The Z
at the source end will change, but who knows whether or not that's a good
thing or a bad thing, so where's the benefit of replicating the load Z at
the source end?
> Do you have any thoughts on why or how a well designed Z
> match could produce cable
> radiation?
For the feedline to radiate, there would have to be currents flowing on the
shield. It would seem to me the only way to get that to happen would be if
there was an imperfect shield connection at the mating connector at one end
or the other. Most Z-matchers I've dissected use a length of wire as an L,
with shunt trimmer caps. Assuming the enclosure itself is bonded well to
the connectors at either end, I can't come up with a good reason why such a
device inserted in a transmission line would cause shield currents to flow
absent a connector issue.
--- Jeff
