[BC] ATU broadband tuning

[towers at mre.com]

I'm by no means an expert or even really clued in, but it has to do with
the antenna itself most of the time.

Gone are the days of simple 90 deg. T's to simply match something to
50-J0. You need to now look at different phase rotations to achive the
best cusp roation for a TX factoring transmission line length. Which might
be something other than a simple T and a great line match.

Remember, it's not the ATU which needs to see 50J0.  It's the TX's
transistors as seen through the various networks.

MM

> How do you guys who know this stuff well, adjust an ATU for not only low
> reflected power at carrier, but also at +/- some amount of khz to effect a
> clean match for good sideband response? I'm not asking for "secrets" if
> you
> have specifics that you like to keep in your toolbox, but in general what
> is
> the "art beyond the science" of broadbanding an ATU?
>
> Initial selection of component values, sliding this this way, and that
> that
> way? What?
>
> Dave Dunsmoor