Reg Edwards wrote:
Jim,

Perhaps there's some misunderstanding about location of the meter and
what it is measuring. Let's try to clear it up.

Would you please do us both a favour by answering the following simple
question?

There is a 50 ohm line feeding a 100 ohm antenna.

There is an SWR meter located at the line-antenna junction.

What does this mean?

The meter has a reading. Does the reading apply to SWR of the
antenna, or does it apply to the SWR along the feedline?

The reading is the SWR at that point.

Antenna or Feedline?
----
Reg.

An SWR meter reads the SWR of the thing connected to its output port
with respect to the reference impedance the meter was designed for.

The SWR meter reads the SWR *AT THE POINT OF CONNECTION* of the
connected system.

Not the middle of the system, not the other end (if it has one)
of the system, but the input point.

If you measure a SWR (50 Ohms reference) of 2:1 for a black box,
what is in the box?

A. A 25 Ohm resistor.
B. A 100 Ohm resistor.
C. A cable spool of coax with some impedance at the end of it.
D. Could be any of the above.

In general there is no guarantee that the SWR at any point of a
transmission line will be equal to the SWR at any other point on a
transmission line other than for special cases.

What seems to have you terribly confused is that all the transmission
lines, tuners, antennas, connectors and whatevers become a *SYSTEM*
and the SWR at the input connector to the *SYSTEM* is not guaranteed
to be the same as the SWR at some arbitrary point inside the system.

When you measure the SWR of a line with a load on the end, you are
measuring the SWR of the entire system relative to your reference,
not the load.

--
Jim Pennino

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