---------- Forwarded message ---------- From: ton ph <[email protected]> Date: Wed, Apr 13, 2011 at 11:14 AM Subject: Re: [Discuss-gnuradio] Guide : what is the value of the IF converted before feeding the ADC in usrp/gnuradio To: "Marcus D. Leech" <[email protected]>
Thanks Marcus for your immediate reply. Now i have a DBSRX and WBX daughterboard , how can i know in what IF it is converted before the ADC, is there any other means to check the IF intake of the ADC ? ... One more thing i would like to know is that , does the IF converted is the same for all the frequencies and bands ? Thanks Marcus for ur concern. On Tue, Apr 12, 2011 at 4:43 PM, Marcus D. Leech <[email protected]> wrote: > On 04/12/2011 04:44 AM, ton ph wrote: > > Hi everyone , > > I would like to know what is the actual last converted IF frequency > > which is actually fed to the ADC in usrp/gnuradio , since ADC rate is > > 64MS/s , I hope it IF should be less than 2xSampling rate of ADC, > > which implies IF could not be 70Mhz. So what is the value of IF before > > entering the ADC and what speed rate does the baseband is fed to the > > ADC for samping. > > Thanks in advance and also i apologize for any errrormatic information > > in my post. > > > It depends on the daughtercard in use, but most daughtercards > down-convert the desired center > frequency to a complex baseband, centered at 0Hz. > > There are execeptions. The original TV_RX used an IF of 5.75MHz, which > was converted to complex > baseband (I and Q) in the FPGA with a DDC. > > > > > -- > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > -- Phenomenon # Life is the most precious phenomenon ever happen ... # Lets pray and give emotional strength to the innocent brave victims of japan. -- Phenomenon # Life is the most precious phenomenon ever happen ... # Lets pray and give emotional strength to the innocent brave victims of japan.
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