Hello Anon, I can confirm that your issue is due to software and not a hardware issue. The fix is released on the maint branch and will be out on the master branch very shortly. https://github.com/EttusResearch/uhd/commit/f76762c6e9cd7d7e308c589d57cb89 1eda45a4e8
Can you please apply the one character edit here and rerun your test? Otherwise you should be able to pull the master branch update in the next day or two to have the relevant fix commit. I apologize for the inconvenience and time you've spent debugging. Regards, Derek On Mon, Jan 15, 2018 at 11:14 PM, Nate Temple via USRP-users < usrp-users@lists.ettus.com> wrote: > Hi Anon, > > Can you try running these tests with a tagged release of UHD, such as > "release_003_010_002_000" instead of the master branch? You may need to > recompiled GNU Radio against this version of UHD. It is important to > download and flash the 3.10.2.0 FPGA image before running the tests. > > If 3.10.2.0 shows the same results, please email supp...@ettus.com and we > can start a RMA. > > Regards, > Nate Temple > > On Mon, Jan 15, 2018 at 11:36 AM, Anon Lister <listera...@gmail.com> > wrote: > >> Nate, >> >> Roger. I set gain to absolute 70dB with no change. Also plotted RX1 >> and RX2(twinrx_ubx_text2.grc). Antenna attached to RX1. Same deal. >> (test_flowgraph2.png). >> >> Also swapped to different X300 chassis as a longshot, but no change. >> >> Looks pretty dead with your attached flowgraph too. (after editing to >> disable the blocks for channel 3/4 since we only have 1 TwinRX) >> (twinrx_front_panel.png) >> >> Same for uhd_fft See attached, also did same command with UBX for >> comparison of spectrum. For the ubx comparison i modified the command >> to reference the TX/RX antenna. (uhd_fft_*.png) >> >> Also attached uhd_usrp_probe incase that is of any use. >> >> Anything else to try, or should I contact Ettus directly for RMA? >> >> Thanks!. >> >> On Mon, Jan 15, 2018 at 1:32 PM, Nate Temple <nate.tem...@ettus.com> >> wrote: >> > Hi Anon, >> > >> > The TwinRX will work fine with the Osmocom Source, however, there is >> more functionality exposed via the UHD Source/Sinks, especially for the >> TwinRX (LO Controls for example). >> > >> > Can you try using the GNU Radio application uhd_fft to test the TwinRX? >> A command such as below should display your local WBFM. >> > >> > uhd_fft -f 100e6 -s 10e6 -g 60 -A RX1 >> > >> > One important note with the TwinRX is the antenna names, “RX1” and >> “RX2”. Also subdev specs need to be set to use multiple channels, “A:0 A:1” >> for a single card. “A:0 A:1 B:0 B:1” for a pair of TwinRXs. >> > >> > Attached is a example flowgraph for a 4 channel configuration with a >> X3xx over 10Gb + two TwinRXs. You can use this as a reference and disable >> the blocks for channels 2-4 if you would like to only use a single channel. >> > >> > >> > Regards, >> > Nate Temple >> > >> > >> > >> > >> >> On Jan 15, 2018, at 10:13 AM, Anon Lister via USRP-users < >> usrp-users@lists.ettus.com> wrote: >> >> >> >> Hey all, >> >> >> >> We recently purchased an X300 with a pair of UBX boards and a TwinRX >> >> board. The UBX works great, but the TwinRX is completely deaf. It acts >> >> as if something in the RF path is broken. Command and control side >> >> seem to work fine. I have attached two screenshots of the FM band with >> >> both TwinRX and UBX, same flowgraph, same X300, same antenna cable. >> >> >> >> I tried: >> >> swapping daughterboard slot on x300. no change >> >> swapping RX port on TwinRX. no change >> >> swapping out SMA-mcx cable on TwinRX. no change >> >> tuning to different areas. get basically nothing anywhere except >> >> slight changes in noise floor amplitude. >> >> >> >> >> >> UHD: >> >> UHDlinux; GNU C++ version 5.4.0 20160609; Boost_105800; >> >> UHD_3.11.0.git-230-gfc8cd827 >> >> Only one daughterboard was in X300 at at time. >> >> >> >> Is there something special you have to do with the configuration of >> >> the TwinRX(See attached flowgraph)? Or do we need to RMA this >> >> daughterboard? >> >> >> >> Thanks! >> >> <twinrx_ubx_test.grc><ubx.png><twinrx.png>__________________ >> _____________________________ >> >> USRP-users mailing list >> >> USRP-users@lists.ettus.com >> >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> > >> > >> > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >
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