On 05/02/2012 07:42 PM, jasonatran wrote: > > Hi All, > > I have a pair of USRP N200s with XCVR2450 daughterboards running the latest > GNU Radio version with UHD. This is an odd problem, but I'm wondering if > anyone has seen this before. > > When I run the benchmark_rx.py/benchmark_tx.py specified at 2.4GHz, the > transmitter is transmitting images of lower magnitude at +/- 0.5MHz, and the > receiver isn't able to decode any radio packets. Some frames are received, > but they are all "ok=FALSE" with the lengths lower than the length of the > actual packet sent. These images persist when I set the XCVR2450's to tx/rx > within its specified frequency range. >
Do you have a screencap of the problem spectrum? Maybe from the perspective of the receiver. > note: the benchmark scripts are from > ~/gnuradio/gr-digital/examples/narrowband/ > > However, when I run the benchmark scripts at "--freq 0" on both sides, the > transmitter says it is automatically set to "4800MHz" (although this is > outside of the XCVR2450's range), and the receiver says it is automatically > set to "2400MHz." Somehow, the transmitter is transmitting at 2.4GHz and the > receiver is tuned to 2.4GHz. The signal is clean, and there are no images in > sight. I used both uhd_fft.py and a spectrum analyzer to check. > Well XCVR2450 has a dual band. I think you are seeing some weirdness with the code either trying to auto select the middle frequency, and the actual frequency being coerced. -Josh _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
