Richard Clark wrote in
:

On 29 Jul 2007 22:25:04 GMT, Ed
wrote:

I only wanted the data to help "prod" the
people in charge of the need to change the antenna system. SWR is a
figure that they recognize.

Hi Ed,

After having heard the third chorus of:
I am not communicating effectively with you!
it is time to analyze why.

Hi Richard,

This all seems much ado about nothing since it emerges that the real
objective is to inform a committe in VSWR speak that the VSWR at the
antenna side of the radio's ATU is more than the specified 3:1
capability.

It seems to me that could be done very easily by measurement, and all the
uncertainty of models that resemble to some greater or lesser extent is
not only unnecessary, but introduces significant error due to the
assumptions used to simplify the model.

It seems that the reduction of the modelled feed point impedance of a
centre fed dipole over an infinite metal plane using an efficient and
effective balun to a single un-qualified metric, the holy VSWR, is a bit
of a fraud.

There is a certain element of "it doesn't matter if it is accurate or
valid, so long as it is compelling".

Owen