Hey Marcus Okay, we looked into this and realized that the rx_samples_to_file program has a bug. When you set the channel, it doesnt tune the center frequency of the desired channel which is why the amplitudes are off. Anything other than the first channel is at DC. Finding this bug led me to a similar issue in my code which let me resolve my problem. Thanks. Is this list the place to report bugs? Thanks.
On Thu, Jun 14, 2018 at 5:45 PM, Marcus D. Leech via USRP-users < usrp-users@lists.ettus.com> wrote: > On 06/14/2018 01:30 PM, Keith k via USRP-users wrote: > >> Hello all >> >> I noticed in my testing that I am seeing significant mismatch in >> amplitude on each channel of my N200(lfrx db) with the second channel being >> much weaker. I thought that it was a problem with my code, but when I hook >> up a signal generator and split to both RX ports and use the >> rx_samples_to_file example, I still see a clear difference as shown in the >> quick plot. >> >> ./rx_samples_to_file --args="addr0=192.168.10.112" --file="samples.dat" >> --type="float" --duration 1 --rate 5e6 --freq 13e6 --subdev="A:A A:B" >> --channel 0 --ref="external" >> >> ./rx_samples_to_file --args="addr0=192.168.10.112" --file="samples2.dat" >> --type="float" --duration 1 --rate 5e6 --freq 13e6 --subdev="A:A A:B" >> --channel 1 --ref="external" >> >> >> However my colleague has his own set of gnuradio code, and when he ran >> his example it produced a plot of similar amplitude. I can't see much of >> what I'm doing different using C++ UHD vs his gnuradio code, but I'm not a >> big expert here so I'm just looking for ideas. Thanks. >> >> >> UHD version UHD_3.11.0.HEAD-0-g13c32cef >> >> >> What subdev spec is your friend using in his flow-graph? Is it .GRC > derived, can it be posted here? > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > -- -Keith Kotyk
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