While typcial 200-MHz ADCs aren't suitable for detecting 2400-MHz
signals directly, they are certainly capable of digitizing 22-MHz-wide
802.11b signals. All that's necessary to do so is to preceed the ADCs
with a simple RF downconverter to convert the 2400-MHz signals into the
0-200 MHz bandwidth of the ADCs.
(There are more exotic ways to downconvert signals, if bandlimited, that
don't require RF downconversion first, but those require special ADCs
and are really off-topic for this group, so I won't go into them here.
For more info, consider reviewing the archives of the
[EMAIL PROTECTED] list.)
Regards,
Greg DesBrisay
On Sun, 2003-06-08 at 06:08, Russell Nelson wrote:
> Douglass Turner writes:
> > I'm starting to get up to speed on SDR and had a question about the extent
> > to which a given SDR device can morph chameleon like into another. For
> > example, could a WiFi AP be implemented via SDR so that it could play the
> > dual role of a RFID reader?
>
> We (the Public Software Fund, http://pubsoft.org/) are funding Eric
> Blossom to work on SDR full-time. He's working on a volksSDR, to be
> interfaced via USB. Bad news: it's slow. Too slow. Nowhere near the
> 900 Mhz band, even, much less 2.4 Ghz. And even at that slow rate,
> it's expensive: estimated to be $300-400 with availability 4Q this
> year. The DACs will only go up to 50 Mhz, the ADCs up to 200 Mhz.
>
> Lots of good info at http://gnuradio.org/ .
>
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