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

[John B. Stephensen]

Mercury would be good for digitizing the IF of a VHF or UHF radio.

73,

John
KD6OZH

----- Original Message ----- 
From: "Robert McGwier" <rwmcgwier at comcast.net>
To: "Alex" <harvilchuck at yahoo.com>
Cc: <hpsdr at hpsdr.org>
Sent: Wednesday, June 14, 2006 00:48 UTC
Subject: Re: [hpsdr] HPSDR Context - high-level viewof how the cards fit
together (DRAFT)


> ***** High Performance Software Defined Radio Discussion List *****
>
> 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_-_0
MHz_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
> Laziness is the number one inspiration for ingenuity.  Guilty as charged!
>
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