On Fri, 18 Jul 2008 18:24:38 -0400, Bee Walton wrote:
>If the baluns are replaced with a ferrite-bead
>type 1:1 balun such as the Force-12 brand, will the antenna pattern or
>other factors be changed?
It is important that you determine whether the existing baluns are part
of a matching network or if they are simply common mode chokes. If they
ARE part of a matching network, you should replace them with a new
version of what you took down. If they are NOT part of a matching
network, but simply a common mode choke, you should replace them with a
choke from my Choke Cookbook in
http://audiosystemsgroup.com/RFI-Ham.pdf
The text about baluns in the above link should also help you understand
and recognize what they're doing in those antennas.
And if they ARE part of a matching network and you replace them with a
new copy of what's there, you should ALSO add one of my chokes, because
it will reduce the receive noise as compared to a lesser balun.
73,
Jim Brown K9YC
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