Yes a small portion of the re-reflected power that gets back to the
antenna is again reflected back toward the transmitter.

There are two ways to look at it. One is the steady state and the
other the dynamic. Once the line is charged with energy, if it a loss
less line, that energy that charged the line will bounce back and
forth continuously. The energy that is put into the line after that
will all reach the antenna and be radiated.

Easiest way to visualize it is with open wire line which has very low
loss. Feeding a non resonant antenna the SWR can be very high on the
line. You can have 50% reflected power on the line. With 100 watts
forward you would then have 50 watts reflected but just about all of
the 100 watts will reach the antenna and be radiated. The only loss
will be the very small loss in the line. (typically a few tenths of a
db loss)

If all the reflected power were to continually bounce back and forth
on the line you would only have half the power reaching the antenna to
be radiated. That doesn't happen except for the first instant that
power is applied and the line is charged with energy.

Regards
Gary



On Thu, 20 Nov 2003 23:47:27 +0100, "Meindert Sprang"
wrote:

"Gary Schafer" wrote in message
news
SWR in itself is not necessarily bad. Power reflected back toward the
transmitter is not lost as a result of the reflection itself. When
that reflected power hits the transmitter it is re-reflected back up
to the antenna.

And where it is reflected back into the cable again. And this continues
until the power is completely dissipated in by the losses in the path.

So a 3:1 swr with 6.25 watts of reflected power and 25 watts of
forward power, still delivers 25 watts to the antenna to be radiated.
That is of course when there is no feed line loss.

No. Power that is reflected the first time, will be reflected the secon time
it 'hits' the antenna. It wil NEVER be radiated.

Meindert