LC,

I guess what you are inferring is that there are two approaches to
buying or building a Bal-Un (Un-Un) for an Antenna.

#1. MOST OF THE TIME: We buy or built a certain kind of antenna that
has a known XXX 'impedance' an installed it the best we can.
- - - Therefore We "ASSUME" that XXX is the antennas 'impedance' and
buy or build a Bal-Un (Un-Un) to match the antenna to the feed-line
and antenna input of the receiver.

2. SOME OF THE TIME: We buy or built a specific kind of antenna an
installed it correctly.
- - - Then We 'test' the antenna with an impedance bridge or antenna
tester and 'know' for a "Fact" the YYY 'impedance' of the antenna.
+ + + Next, knowing that YYY is the antennas 'impedance': We buy or
build a Bal-Un (Un-Un) to match the antenna to the feed-line and
antenna input of the receiver.
= = = Finally, We Re-Test the Antenna with the Bal-Un Installed to
confirm our results.


~ RHF
..
..
= = = "Lionel Carter"
= = = wrote in message ...
I would also be interested in the answer.
My impression is that particular balums are used purely on a custom and
practice basis and 'suck it and see'. I have not seen any guide to measuring
the rf resistance/impedance of a throw out or long wire antenna.
If someone doesn't answer your question the chances are they don't know
either.

Lionel Carter

"Michalkun" wrote in message
.251...
How does one can determine the impendance of a wire to get the right balun
for it, so it can be hooked up to the coaxial cable?