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Re: Topband: Adjusting termination resistance

To: "John Harden, D.M.D." <jhdmd@bellsouth.net>,<topband@contesting.com>
Subject: Re: Topband: Adjusting termination resistance
From: "K9AY" <k9ay@k9ay.com>
Reply-to: K9AY <k9ay@k9ay.com>
Date: Wed, 28 Dec 2005 17:14:48 -0600
List-post: <mailto:topband@contesting.com>
>I use W8JI's technique for my K9AY loop system (homebrew). I use an SWR 
>analyzer feeding a small amount of RF into the system, and adjust the 
>termination resistance SWR for minimum at 1.830.
>
> John, W4NU
>
----------

John and all,

With a K9AY loop, as with a Beverage, minimum VSWR is not a measure of 
antenna performance, although it may happen by coincidence.

In an installation using an accurate 9:1 transformer, with typical ground, 
the lowest VSWR will occur near the ~400 ohm optimum termination resistance. 
But, for example, if your transformer is 4:1, the termination still needs to 
be 400 ohms, not the 200 ohms that will give you the lowest VSWR.

73, Gary
K9AY

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