[hpsdr] Intelligent or dumb Alex, food for thought...

[Henry Vredegoor]

Hi All,
 
I see a lot of discussion about Alex around a number of points:
 
- On-board intelligence (CLPD) and flexibility versus "dumb" control
- Which band pass filter frequency ranges to implement
- Space requirements
 
Also there was a request to have the band pass filter center frequency
automatically adjust to the RX frequency in use. 
 
Yes, you saw this one comin'........... ;-)
 
If we were going to have on-board intelligence anyway, would it be a more
strait forward solution in this case to have this CLPD control one (or two,
for dual RX)  say ~0 to ~30 MHz "CLPD-tunable" band pass filter's, instead
of controlling (switching) a number of fixed band pass filters?
 
Would this be doable and practical?
 
- Less required space?
- Only one (or two) RF-shielded compartments
- All band
- Performance w.r.t. noise (From control lines)?
- Flexibility, selection of passband slope/center frequency position w.r.t.
RX frequency
- No (non-) overlap issues
 
Just some food for thought....
 
Henry.
 
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