Typically with a t-match the matching arms are adjusted for an impedance of
200 ohms and then a halfwave coax 4:1 transformer is used for matching to 50
ohms unbalanced feedline.
73
Peter
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Bob Maser
Sent: Samstag, 19. Juli 2008 04:09
To: towertalk@contesting.com; Bee Walton
Subject: Re: [TowerTalk] Yagi Balun
I do believe that the Telrex monoband yagis employed the use of a T match in
the driven element. The impedance of a T match is not 50 ohms but 400 to
600 ohms. You would probably need a 9:1 Balun. A 1:1 Balun will not work.
Bob W6TR
----- Original Message -----
From: "Bee Walton" <k4jld@juno.com>
To: <towertalk@contesting.com>
Sent: Friday, July 18, 2008 6:24 PM
Subject: [TowerTalk] Yagi Balun
> Three 29 year old TELREX MONOBAND yagi's are off the towers and on the
> ground for maintenance and repairs. The factory made and installed coax
> baluns will be replaced. 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?
>
> Thanks.
>
> Bee K4JLD
> k4jld@juno.com
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