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[TowerTalk] Re. Impact of Reflected Power

To: <towertalk@contesting.com>
Subject: [TowerTalk] Re. Impact of Reflected Power
From: nx4d@sundial.net (DOUG WALLER)
Date: Tue, 28 Jul 1998 12:33:33 -0400
Naaaahhh, cant be.  If initial sig hits antenna, and part of energy is
reflected back to amp, then all of that is reflected back to ant, then we are
already getting these two sigs out of phase.  then if part of that is reflected
back to amp, then reflected back, we are even more out of phase.  Depending on
the transmission line length and its velocity coefficient, pwr nulling by
phaseout would seemingly take place.  Even if this is wrong, I just dont like
it, i tell ya!
    Peace, Doug - Nx4d

DavidC wrote:

> > Reflected POWER has little to do with anything except as it affects
> > voltages, currents, and impedances by presenting a different impedance to
> > the PA.  73 Tom
>
> So, are we agreeing to conclude that reflected power that is resolved by
> the final tuned circuit of an amp, rig, or antenna tuner is meaningless and
> to be ignored as irrelevant at HF frequencies?
>
> I am using "resolved" to mean that the amp or rig is protected from
> troublesome voltage, current and/or impedance's.  I am also using it to
> mean that essentially all reflected is re-reflected back to the antenna and
> directed to its intended destination.
>
> One question:  If one adds a group of toroid beads to the coax immediately
> exiting the amp or rig (some say this helps with impedance stability and
> eliminating rf in the shack), what is the actual result?  Is any
> significant loss injected into the system design?
>
> Thanks & 73, DavidC  AA1FA
>
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