On 15.01.2011 13:45, Patrick Strasser wrote: > For flexibility, being able to bypass stages or feed signals e.g. at the > ADC would be cheap. Preparing for different transport systems would make
I wonder how much noise will be introduced with a switch at the ADC. At least I would use 2 different input connectors, because switching in front of the LNA would surely introduce too much noise (except some special shielded RF relays). > it more future proof. If USB3.0 hardware support is not satisfying now, > maybe it is in two years. For the data bus part this would require a > prepared interface for data and control lines. At least the USB3.0 solution would be backwards compatible to USB2. So it does not harm for older machines. > I see the target for such at above all the soundcard solutions and below > the USRP1. USRP1 can do 8MHz Bandwidth complex at 14bit/sample RX, which > is more than enough for hobbyists. What would be interesting for Is this the limit? I was reading that the usable bandwidth (below line speed) is about 40 MB/s, so about 10 MS/s complex or 10 MHz baseband. It's not more than enough, but I could live with that restriction (if it's for a good low-cost compromise). > university teaching and research? What would be interesting for other > potential users, like hams? Did I miss some? Yes, children and adult who like to play with electronics at home. It could be an oscilloscope, spectrum analyzer, signal analyzer, logic analyzer (ok, only 1 channel), signal recorder ... People who don't make profit with it, have no university or tax-paxer to finance the box ... all those who can't pay the price of $1000 for USRP (incl. tax, shipping, RF boards etc.) > For a start, a not too expensive, but still capable system with options > for extension seems most doable for me. If the transport systems is to > be fully integrated in the first shot, at least the data should be > accessible via some interface. I agree to start not too expensive. The advantage of open-source community projects is, that it will be easy to modify the design later, replace controllers, upgrade RF mixers or replace ADC by faster ones. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
