Hi, Eric Would you please iterate more on the concept of PGA? I don't understand it quite well. Is it just an amplifier after the ADC, so that the 16-bit signed integer is multiplied by the value of pga? Or, let's say the pga is 10, is it true that the p-p value of the adc is not 1V--1V, but 0.1V - -0.1V, so that the ADC can quantize the signal more subtly??
And how about the Tx path? Thanks Sachi --- Eric Blossom <[EMAIL PROTECTED]> wrote: > On Tue, Jul 19, 2005 at 06:08:27AM +0500, Ahmad > Sheikh wrote: > > > The USRP user guide states that there is 20 db of > gain on the > > USRP. Assuming that this is on the Receive path > Programmable Gain > > Amplifier on the MxFE, can this be used as an AGC? > > Yes. > > > I want to control the strength of the signal > received. The way to do > > this, I think, would be to dynamically alter the > value written to > > the Rx A/Rx B registers, using some feedback > control > > mechanism. Would this control be on the FPGA, or > GNU Radio > > Python/C++ software using > usrp.source_c().set_pga()? Is there > > already some structure provided to do this? > > The easiest way is using usrp.source_c().set_pga() > > Eric > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > ____________________________________________________ Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
