On Sat, 15 Oct 2005 03:37:16 GMT, Cecil Moore wrote:

Owen Duffy wrote:

Cecil Moore wrote:
and not to be a myth at all. There's 104.17 watts of forward power
through the Bird and 4.17 watts of reflected power back through the
Bird. Why does the Bird ignore those actual power values?

I did not report or even measure such a thing.

Since I realized the Bird forms a Z0-match at its output that
statement should be ammended to say: There 104.17 watts of forward
energy flowing in the 75 ohm coax on each side of the Bird and 4.17
watts of reflected energy flowing in the 75 ohm coax on each side
of the Bird. Why does the Bird ignore those actual power values
existing in the actual system?

100W--tuner---75 ohm coax---Bird--1/2WL 75 ohm coax--50 ohm load
Pfor=104.17W-- Pfor=104.17W-- 100W delivered
--Pref=4.17W --Pref=4.17W

The Bird is not reading the proper values of forward and reflected
power on the 75 ohm coax because it is embedded in a non-50 ohm
environment.

This has nothing to do with the stated myth: Measurements with a Bird
43 of the conditions on the Thruline section are invalid unless it has
some minimum length of 50 ohm line on both sides of itself.

Nothing in the myth stated or implied direct application of the
measured conditions on the thruline section to any other connected (or
disconnected for that matter) transmission line, that is entirely your
construction.

It is a diversion Cecil.

Owen
--