On Tue, 8 Jan 2008 20:38:40 -0500, "AI4QJ" wrote:


"Richard Clark" wrote in message
.. .
On Tue, 8 Jan 2008 19:57:18 -0500, "AI4QJ" wrote:

measures delta I**2 or delta V**2

What is delta, specifically as you use it here?

The delta between what is sent forward and what is reflected back. If the
delta is zero, SWR = 1:1.


Hi Dan,

I was trying to untangle this expression from your statement:
I have not seen a meter that
appears to directly measure the ratio of Vmax forward/Vmax reflected or Imax
forward/Imax reflected, which *would* be a direct SWR measurement.

How does you lack of exposure to such an instrument impact this
thread? Do you need it for assurance? Does it demonstrate something
lacking in other methods of determination? I've already written to a
method of determining not only SWR but the phase of reflections using
one meter, switched between three points along a line (or probed
directly). Such a method does not deny the accuracy of other methods
or reveal any more information.

In short, what significance is there in a "direct SWR measurement?" My
skill at it is hardly remarkable until you get to some rather obscure
situations (and a lot of what is obscure here passes as discovery of
the ages stuff, but those discoverers lack the skill).

73's
Richard Clark, KB7QHC