On 14/10/2011 1:06 PM, John Ackermann N8UR wrote:
It may not work to actually improve power efficiency, but another goal
is to just make it sound better by not raising the background level
across the whole output spectrum where there is no signal present. By
the time you add 40 or 50 dB gain at baseband, the amplified noise at
the transmitter is pretty noticeable.
This is all just an experiment to see what can be done, and to learn
some GRC in the process. :-)
John
Yup, I understand. The question is what fraction of delivered noise in
the absence of an actual signal is internally-generated in the transmitter,
which fraction isn't. But some of this problem (if you're not
interested in TX power efficiency) should be dealt with by the receiver.
Interesting experiment.
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