On Wed, 22 Jul 2009 18:34:46 +0200, "Antonio Vernucci"
wrote:

Even considering an ideal S-meter ... If the
wanted signal is not strong enough to overwhelm al other contributions, doubling
the transmit power will not turn into a 3-db S-meter reading increase.

It would have to. Any additional power to the general spectrum is
going to raise the power in the spectrum - even if you cannot
distinguish it. That is, afterall, how the spectrum gets to become so
noisy. If you are tuned to the radiator that has gone through a power
boost, then your S-Meter should indicate it.

73's
Richard Clark, KB7QHC