David Young writes: > It's not quite as bad as that. 50 MHz is an adequate sampling rate > for a 25 MHz-wide 802.11b channel, and virtually every 802.11b radio > shifts from the carrier frequency to some lower frequency (374 MHz > is typical) where the modulator/demodulator runs. An 802.11b SDR will > be no different, but the shift will be longer.
Thanks for pointing that out. That's good news -- means that we're much closer to SDR being seriously useful. But ... doesn't that limit the bands in which the radio can operate? Or are you already limited in that you need multiple front-ends anyway? For example, you could create (I'm guessing) an SDR with three front-end RF transceivers, one for 928 Mhz, 2.4Ghz, and 5.7 (whatver) Ghz, and one SDR that takes care of the different modulations needed. Don't you need different antenna lengths for such disparate frequencies? -- --My blog is at angry-economist.russnelson.com | Rebecca's incredibly neat Crynwr sells support for free software | PGPok | County Fair quilt is now 521 Pleasant Valley Rd. | +1 315 268 1925 voice | at http://rebeccanelson.com/ Potsdam, NY 13676-3213 | +1 315 268 9201 FAX | quilt/index.html -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless
