F.Y.I.
I know of at least two experimental ANTENNA --> DSP designs that are
out there being tested:
HPSDR "Mercury" design
http://hpsdr.org/mercury.html
and Phil Covington N8VB's QuickSilver QS1R/QS1T design
http://pcovington.blogspot.com/2006/12/qucksilver-qs1r-software-defined.html
de ken n9vv
Is there no way to put dsp at/as the first filter?
Yes, more or less. This is High Performance Software
Defined Radio solution where you connect the ADC to
the antenna, then a DSP is handling all the
demodulation of signals, manage the filters and
notches, once this works (software) is completed the
voices or dit dah willa come out from an audio
amplifier and on to the loudspeaker(s).
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