Tayloe Dan-P26412 wrote:
single composite receiver with a lower noise floor. If you
added just enough RF pre-amplification to overcome the signal
splitting loss to N receivers, adding more and more receivers
Only if the pre-amplifiers are noiseless, or at least contribute
equivalent input noise power that is much less than the equivalent power
generated by the receiver times their gain. In that case, you could do
better by using the pre-amp on one receiver and dumping the excess gain
later in the system. That's better in noise, but you may compromise
dynamic range more.
in parallel will produce a composite receiver that has a
better and better noise floor. This is in essence what the
space telescope folks do. They gang many dishes and many
receivers together across a very large area to get an
enhancement on the signal and space noise and a suppression of
the effective receiver noise contribution.
In this case, there is no splitting loss, and the noise is uncorrelated
because it is being received at different locations.
--
David Woolley
"The Elecraft list is a forum for the discussion of topics related to
Elecraft products and more general topics related ham radio"
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