A typical transmitter does not reverse terminate the transmission line
with its characteristic impedance, so most of the reflected power gets
re-reflected as forward power. Reflected power isn't necessarily lost
power. At least at lower frequencies, it is likely to present a much
higher impedance. A final that did accurately terminate the line would
be rather inefficient.
A more important issue with SWR is high SWRs can cause clipping (you
need a larger voltage swing if the load is higher (assuming purely
resistive for the moment), or take it outside the safe operating area of
the output devices.
Those may cause problems at quite low SWRs, but they actually depend on
the complex impedance, so on some parts of the Smith chart circle you
may be completely safe, but on others, you might kill the finals.
On 09/04/2019 22:39, Roger D Johnson wrote:
For an interesting discussion..."What happens to the power that's
reflected?"
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