Remember, all the tuner does is keep the radio happy.  If the radio 
would dump a hundred watts into say a 200 ohm load, you wouldn't need 
the tuner, but neither would your radiation pattern change.  All kinds 
73
Butch
WA0VJR
Node 3148
Wallace, ks.


of strange stuff comes into play, coax losses, reactance and so forth 
and actual impedence of the antenna.  On Tue, 13 Dec 2011, Howard Kaufman 
wrote:

> I guess the theory is that on 20 it is a bit long for resonance, which now
> looks like a 3/8 wave.  Any antenna used on multiple bands will work
> differently on each band.
> I am trying to understand at what point the SWR drastically effects the
> efficiency of the vertical.  The variables seem to be reflected power and
> transmitter shut back when it sees the reflected power.  That can be
> eliminated with a tuner, but I don't know if doing that actually delivers
> more signal to the antenna or not.  Working with shielded line and a tuner
> is new to me.
> I am going to try a remote automatic tuner at the base of the antenna.  That
> sounds like the best way to go for efficient multi-band operation.  I think
> that with coax, the tuned reflected power probably warms the coax rather
> than is radiated by the vertical.  It looks like stretching the efficient
> use of the antenna from 17 meters to 29.2 for A.M. Phone is asking a lot,
> which makes sense to me.
>
>