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[Towertalk] balun measurements

To: <towertalk@contesting.com>
Subject: [Towertalk] balun measurements
From: k1ttt@arrl.net (David Robbins K1TTT)
Date: Thu, 9 Jan 2003 16:18:13 -0000
Some of that data for two types of coils is on my web page at
http://www.k1ttt.net/technote/airbalun.html, it might give you some idea
of what you are looking for and some of the things you must consider.


David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
 

> -----Original Message-----
> From: towertalk-admin@contesting.com [mailto:towertalk-
> admin@contesting.com] On Behalf Of Eric Scace K3NA
> Sent: Thursday, January 09, 2003 16:06
> To: Topband; John Brosnahan W0UN; Towertalk
> Subject: [Towertalk] balun measurements
> 
> Hi --
> 
>    Where would I find measurements for baluns at various frequencies
when
> attached to a mismatched load?  I'm specifically
> interested in:
> 
> 1.  Balun types of interest:
>    -- the coil of transmission line.
>    -- the transmission line passing through a chain of ferrite beads;
> e.g., Force12
>    -- other rod/toroid baluns, if available.
> 
> 2.  Measurements of interest:
>    -- equivalent L-C-R network, if possible.
>    -- attenuation
>    -- phase shift from the load (antenna) to generator (feedline
> attachment) side
>    -- impedance transformation from the load (antenna) to generator
> (feedline attachment) side
> 
>    I'm particularly interested in understanding the impact of a balun
on
> signals in a transmission line across a band, when looking
> into the shifting complex impedances presented by real antennas
outside of
> resonance.  I've checked "Transmission Line Transformers"
> (2nd edition, ARRL), but the only data is attenuation when operating
into
> a load of Z=Zo.
> 
>    Thanks for any tips for data.
> 
> -- Eric K3NA
> 
> 
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