Hi Anon, Please disregard my comment before about the Osmocom blocks, I had switched to the wrong flowgraph.
A normalized gain of .5 on the TwinRX is bit low. The TwinRX has 95dB of adjustable gain. Around 60-70 dB will usually provide a good SNR with a common antenna attached. Regards, Nate Temple > On Jan 15, 2018, at 10:32 AM, 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 > > <twinrx_front_panel_4ch_tabs.grc> > >> 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
