[hpsdr] A Couple of Dumb HW Questions

[Alex]

Larry,
Some answers for your questions.

(1) JANUS is an interface board for the SDR-1000, so we're just replacing (and upgrading) the function of the host computer's soundcard. MERCURY will be using the Linear LTC2208 so it will be a significantly wider bandwith.
HORTON is another receiver with narrower bandwidth than MERCURY.

(2) Because the TI DSP is being used for SDX on EAGLE. Plus the development tools were provided by TI, AD or Moto/Freescale didn't provide their development tools (so it's a matter of economics). SASQUATCH is a slightly modified reuse of the SDX design. 

The HPSDR wiki and the website have some good information on the cards and the logic behind their designs.

Yes, AD has some real cool ICs out there, a lot are being used for CASMIR and probably for HORTON.

Alex, N3NP

----- Original Message ----
From: Larry Gadallah <lgadallah at gmail.com>
To: hpsdr at hpsdr.org
Sent: Wednesday, May 17, 2006 2:52:21 PM
Subject: [hpsdr] A Couple of Dumb HW Questions

***** High Performance Software Defined Radio Discussion List *****


Hi All:
 
 I have two (potentially silly) questions about some of the hardware being chosen:
 
 1. If AD has some nice 1-2 Msps 24 bit ADCs now (as was mentioned earlier on the list), then why not use one of them in Janus instead of limiting ourselves to consumer audio speeds of 96-192 Ksps?
 
 2. I know there may be some AMSAT history I'm missing, but why use a TI DSP for the Sasquatch board, rather than something easier to program (IMHO) like a AD Sharc or a Moto?
 
 Disclaimer: I don't work for AD, own any of their stock, etc. They just seem to have a cool product line these days.

 73,
-- 
Larry Gadallah, VE6VQ/W7
lgadallah AT gmail DOT com_______________________________________________
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