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Re: [TenTec] OT Antenna Tuners

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] OT Antenna Tuners
From: Ken Brown <ken.d.brown@hawaiiantel.net>
Reply-to: ken.d.brown@hawaiiantel.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sat, 19 Jul 2008 08:29:26 -1000
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
> Does not mention L networks as to why it will not give you the improper Q 
> match like some tuners do with a 1:1 SWR.  Or did I miss that?
Think about it mathematically. With an L network you have only two 
variables, the inductor and the capacitor. The goal is to transform the 
impedance of the load to 50 ohms resistive. The load can be described 
with just two values (at a given frequency), such as resistance and 
reactance. (There are a lot of possible ways to describe the load, 
whichever way you choose to use requires only two values to describe it 
at a single frequency) You want to find the settings of the two 
variables which solve the equation. With an L network there is exactly 
one combination of those two variables that solves the equation. With a 
Pi network or a T network you have three variables. With three 
variables, there are an infinite number of possible combinations that 
can solve the equation. All of theses solutions will result in a 50 ohm 
resistive load seen by the source, yet they may also result in 
unreasonable currents or voltages in the network


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