[TenTec] Re: Al Gavenas' position on Front-End atenuation

[eugene gerber]

Well, George. I won't belabor the point..Suffice to say that altho I have an
atu, which I use on vacation with random bits of wire, I have never found
the need for one, otherwise. If my rig put out 100 watts barefoot or 7-800
watts with the linear, whether 100% or 95% gets to the antenna is
immaterial, and it would take very good measureing equipment on the
receiving end to tell the difference...enough said, but I have enjoyed these
interchanges very much...trouble is, its too easy!!!! gene
----- Original Message -----
From: "George, W5YR" <w5yr@att.net>
To: <tentec@mailman.qth.net>
Sent: Friday, April 11, 2003 9:58 AM
Subject: Re: [TenTec] Re: Al Gavenas' position on Front-End atenuation


> Ah, but it does, Gene!   <:}
>
> Reflections II does a great job of explaining this, but the too-short
> version is that when the tuner is adjusted to present a 50-ohm load to the
> transmitter, the impedance seen looking back into the line at the antenna
> feedpoint and looking into the feedpoint itself are complex conjugates of
> one another so that any reactance is cancelled and maximum available power
> is transferred.
>
> The resulting remaining real part of the antenna input impedance may not
> match the Zo of the feedline so an SWR can be present, but the antenna
has,
> in fact, been made non-reactive and the entire system - tuner, feedline
and
> antenna - is resonant at the operating frequency.
>
> The antenna itself *is* tuned - this was recognized decades ago in QST in
a
> classic article by W1DX entitled something like "My Feedline Does Tune My
> Antenna."
>
> Sorry I don't recall the issue . . .
>
> 73/72, George
> Amateur Radio W5YR -  the Yellow Rose of Texas
> Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
> "In the 57th year and it just keeps getting better!"
> <mailto:w5yr@att.net>
>
>
>
>
>
> ----- Original Message -----
> From: "eugene gerber" <w2gcx@gte.net>
> To: <tentec@mailman.qth.net>
> Sent: Friday, April 11, 2003 10:41 AM
> Subject: Re: [TenTec] Re: Al Gavenas' position on Front-End atenuation
>
>
> > You will: just keep pushing out the r.f....enough leaks past the a.t.u.
to
> > keep you healthy....incidentally, where did the name "antenna TUNING
unit"
> > come from...it may do many things, but tuning the antenna is not one of
> > them...73 gene
>
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