Topband: "Uncle" Beverage

[Tom Rauch]

> What exactly does swing wildly mean?  On a frequency range
from 1.8-7.0 what
> should one expect?

You have to measure at the antenna, unless the analyzer and
feedline are the same Z. This also assumes you have a good
transformer design that doesn't change ratio much over the
test range. A narrow band matching network won't work.

1.) You sweep the low-Z side of the matching transformer and
watch the absolute value of SWR over a wide frequency range.
The absolute value of SWR does not matter a great deal. It
might be ~3:1 or ~1:1. (Let's just say it is 2:1 in this
example even though it might be any reasonable value.)

2.) If the value of SWR varies (from 2:1 in this example) as
you change test frequency, it means the antenna is
misterminated and has standing waves.

This test has to be made near the antenna if the feedline
doesn't match the analyzer normalized impedance.