On 12.01.2011 00:13, Patrick Strasser wrote: > > You need the decimation on the device side of the USB connection to > reduce the amount of data sent over it. The absolute limit isbetween 32 > an about 40MiByte/sec. Divided by 16bit=2byte per sample is 16-20MSPS > real-valued or 8-10MSPS complex-valued. Either you reduce the sampling > rate or you decimate. That rate should be more than sufficient for all
Yes, for home use this rate is quite Ok. I think my PC could handle DDC and FFT at this rate, except some more complex operations. > but the most demanding experiments. The only common interesting signals > that need more bandwidth are TV (6-8MHz), GPS (2-20MHz?), WLAN (20MHz), > All of them in higher bands, where mixing the signal down into the ADC > frequency range would be needed. My interest is to use such a device as a signal analyzer, waterfall diagram, spectrum analyzer, signal recorder, logic analyzer etc. At home I could never afford a professional one. At the moment I have only my old analogous Oscilloscope. But advances in technology ... > An other way would be to change the interface, which would very likely > be Gigabit-Ethernet. Maybe an FPGA Experimentation kit could be extended with an RF/Sampling part: $400 price class, includes PowerPC, 64 DSP slices, Gigabit Ethernet, 64 MB RAM, just RF part and A/D converters are missing: http://www.eetimes.com/electronics-products/fpga-pld-products/4103784/-395-Virtex-5-FXT-FPGA-evaluation-kit Ok, not Open-Source hardware, but at least cheaper than USRP2. _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
