[Antennas] increased antenna bandwidths through a tuner, why?

[Dr. William J. Schmidt, II]

It's not a guess... its a fact.  The tuner as a new transformer in the 
circuit has a different (lower) Q than the antenna.  Even though resonate at 
the same frequency, the bandwidth wider as a result.  The efficiency 
(radiated power by the antenna) is also lower.

Sincerely,

Dr. William J. Schmidt, II  K9HZ
Trustee of the North American QRO - Central Division Club - K9ZC

Email: bill at wjschmidt.com
WebPage: www.wjschmidt.com

"If you drink... don't drive.  Don't even putt"  - Dean Martin.


----- Original Message ----- 
From: "Robert Lay (W9DMK)" <w9dmk at crosslink.net>
To: "Sam Morgan" <ka5oai at cox.net>; "antennas - qth.net" 
<antennas at mailman.qth.net>
Sent: Saturday, April 29, 2006 9:02 AM
Subject: Re: [Antennas] increased antenna bandwidths through a tuner, why?


> Dear Sam,
>
> You did not say what SWR you have at "minimum SWR". If it's 1:1, that's 
> one thing. If it's not 1:1 then Chris has a point.
>
> My guess is that the tuner has its own losses, which are often quite 
> significant, and that could lower your overall system Q and efficiency, 
> which would show up as increase bandwidth.
>
> My "SmartSmith" Smith Chart program would allow you to model your antenna 
> and your coax line and your tuner, if you have the patience to do all 
> that.
>
> 73 de W9DMK - Bob Lay, Dahlgren, VA
> http://www.zaffora.com/W9DMK/W9dmk.html
> w9dmk at crosslink.net
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