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A radiometric receiver
is used in passive sensing, such as radio
astronomy. A key characteristic of a radiometric receiver is
that it usually has incredibly wide bandwidth.
One classic radiometric receiver
is the Dicke radiometer. Robert Dicke developed it during WWII when
he worked at the Rad Lab.
He appears in our Microwave
Hall of Fame!
The Dicke radiometer is characterized
by a switchable resistor (the Dicke switch) on the input that is
used to calibrate noise temperature. That is a lame explanation,
we will add to it later.
For now, here is a web site that
provides a block diagram of the Dicke radiometer.
More coming soon! Especially
if one of our readers can contribute some content!