Re: [Discuss-gnuradio] USB2 ADC and DAC discussion

[Paul J. Zawada]

At 2:56 PM -0700 6/4/03, Matthew Ettus wrote:
> http://comsec.com/wiki?UniversalSoftwareRadioPeripheral
>
> Since the board is only baseband/IF, I am interested in finding people to work
> on RF converters for it.  One for the 1200MHz ham band, and one for the 2.4GHz
> ISM band would be nice for starters.  If you are interested in working on such
> a project, let me know, and I can get you all the info you will need.

Matt and all,

I have just finished putting together a GNU Radio platform including 
the Microtune tuner using the schematic Eric supplied.   It's all 
working quite well and you can see the results I've obtained 
(including a few FFTs and DTV captures) at 
http://ner.ncsa.uiuc.edu/sdr .  Now I'm ready to start some real 
work. :-)

I've been starting to plan to build a 900 MHz (902-928) 
upconverter/downconverter for use with GNU Radio.  I'd thought I 
might start with a narrow band implementation to use a sound card and 
work my way up to a broadband implementation for use with a 
high-speed ADC/DAC solution such as the one you are working on. 
(I've got the Measurement Computing ADC card, but I'm going to need a 
DAC solution; so this one may fit the bill!)  This will be my first 
design at 900 MHz (or higher), so it may take me some time to get 
ramped up and a decent design produced.  The intent is to produce a 
board at to receive and transmit at acceptable power levels for 
unlicensed use while allowing the ability to add a power "brick" for 
ham use.

My design hasn't progressed beyond a couple of block diagrams in my 
engineering notebook, but now that I've got the Microtune 
implementation built and operating I can concentrate more on 
designing new hardware.   (I do still need to familiarize myself with 
the code too; so I plan on spending some time hacking on some 
software as well...)

--zawada

--
Paul J. Zawada, PE       | Principal Network Research Engineer
address@hidden          | National Center for Supercomputing Applications
+1 217 649 2233          | University of Illinois at Urbana-Champaign