[hpsdr] HPSDR Context - high-level viewof how the cards fit together (DRAFT)

[Robert McGwier]

Alex:

Some of it does not fit with what I thought was happening.

Horton takes in analog RF and produces I/Q by doing quadrature 
integrate/sample/hold detection but then only after opposite phase 
samples have been subtracted from each other.  And like all 
unimplemented undesigned things,  it is supremely powerful and 
perfect.    ;-).  The original proposal said a QSD would be used, so I 
base my comments on that.  You show I/Q coming in from the front end.

Mercury can take in analog RF and produce I/Q since its ONLY function is 
likely to be to act as a DDC.  I supposed it could take in I/Q but I 
would personally like to see a really good argument for it before it 
made sense to me.

Casmir needs to produce RF to be amplified and mixed and if you are 
using the I/Q modulators and demodulators from AD respectively,  then it 
will produce a single analog RF output or receive a single analog input.

Did I get stuff wrong in my head?

Bob
N4HY




Alex wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Here's a drawing I did to try to describe how I think all the HPSDR cards fit together. 
>
> Before anyone comments, yes, JANUS isn't on the drawing. I am trying to describe a fully configured HPSDR w/o an SDR-1000 or other radio.
>
> I added it to the CASMIR part of the Wiki (http://hpsdr.org/wiki/index.php?title=HpsdrWiki:Community_Portal#CASMIR_-_0MHz_to_2.5GHz_Transmitter_Card)
>
>
> It's a draft, so constructive comments are appreciated.
>
> Alex, N3NP
>
>
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AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
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