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

[George, W5YR]

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