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Re: [TenTec] tuner battle?

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] tuner battle?
From: Robert & Linda McGraw K4TAX <RMcGraw@Blomand.Net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 22 Feb 2006 11:12:10 -0600
List-post: <mailto:tentec@contesting.com>
Yes, and if you dumped the T match network and replaced it with an L network 
tuner you would find that the matching is much easier and always accurate. 
The L network will only match at one combination of L and C values.  The T 
networks are known to appear to match at several combinations of L and C 
values, however only one combination is most efficient.  It requires a 
network analyzer to figure out which one is correct.

Bob, K4TAX

> Hardly,
> I'm an apartment dweller, and QRP contester.  I've always had to make do
> with compromise antennas, and T-matches.  Even with a roller inductor, I
> still occasionally can't get down to 1.5:1 or less for an SWR.  This is
> where the radio's autotuner comes into play.  First, I tune for as low of 
> an
> SWR as I can get with the T-match.  THEN, I use the radio's autotuner to 
> get
> the radio seeing 1.5:1 or less.  BUT, you ahve to use the autotuner after
> you're done with the T-match, otherwise, it will most definitely "fight"
> with the T-match (you'll wind up tuning with one, and then the other, over
> and over again).  It'll be like a dog chasing its tail.  So the T-match 
> does
> the basic tuning for the band you're on, and then the autotuner does the
> fine tuning, and if you do search & pounce in contests, like I do, the
> autotuner will fine tune your SWR for any significant frequency chenges 
> you
> make on the band.  But, you have to leave the T-match alone, once you set 
> it
> on the band you're operating.

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