On 11/29/2011 02:38 PM, Kevin Tien wrote: > Hi, > > We're using USRP2s with the RFX2400 daughterboards, and we've recently > switched from the old USRP drivers to the UHD drivers as per general > recommendation. However, we've run into a few problems that have us > stumped: > > 1) Previously, our receiver gains were set to 0 dB and we had no > problem receiving a signal with >30 or 40 dB SNR. However, now the UHD > receiver blocks need specified gain around 30 or 40 dB to achieve this > same performance; did baseline values change? >
Are you selecting the correct antenna? Its possible the default RX antenna setting is different. > 2) As far as we can tell through searching the Internet, the sampling > rate in the Tx/Rx blocks has replaced the decimation and interpolation > fields from the legacy blocks. But what exactly are we specifying with > the sampling rate now? Is it the sampling rate the rate at which the > transmitter transmits samples, with interpolation assumed if the data > going into the block isn't throttled? In which case, would higher > sampling rate imply lower 'interpolation' rate? Bottom line, we have > no idea how to play around with the sample rate, or how important it > is. > The sample rate is the rate of samples between host and USRP. on RX: sample_rate = dsp_rate/decimation on TX: sample_rate = dsp_rate/interpolation -josh _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio