> > BPSK modulated RF at 2.2 GHz, -15dBm, feeding a power splitter > | > (A) --> -9dB pad --> B210 > (B) --> Agilent VSA. > > > TX Symbol rate is 1389 Hz and RX symbol rate was set to 5556 Hz to give > the illusion of 4 symbols high and 4 symbols low. (11110000) which is what > you see illustrated in each of the two images (if they displayed correctly > in the email) > > I am capturing the signal by using a simple GNURadio block --> file sink > Sample rate is 222kHz. Fctr is 2.2 GHz. > > (message from GNURadio console) > Win32; Microsoft Visual C++ version 14.0; Boost_106000; > UHD_003.010.001.001-0-unknown > > > UHD Error: > Device discovery error: input stream error > -- Detected Device: B210 > -- Operating over USB 3. > -- Initialize CODEC control... > -- Initialize Radio control... > -- Performing register loopback test... pass > -- Performing register loopback test... pass > -- Performing CODEC loopback test... pass > -- Performing CODEC loopback test... pass > -- Setting master clock rate selection to 'automatic'. > -- Asking for clock rate 16.000000 MHz... > -- Actually got clock rate 16.000000 MHz. > -- Performing timer loopback test... pass > -- Performing timer loopback test... pass > -- Asking for clock rate 56.832000 MHz... > -- Actually got clock rate 56.832000 MHz. > -- Performing timer loopback test... pass > -- Performing timer loopback test... pass > gr::pagesize: no info; setting pagesize = 4096 > -- Asking for clock rate 56.832000 MHz... OK > -- Asking for clock rate 56.832000 MHz... OK > > >>> Done > > (GNURadio block diagram) > (run_gr console) > >uhd_usrp_probe > Win32; Microsoft Visual C++ version 14.0; Boost_106000; > UHD_003.010.001.001-0-unknown > > > UHD Error: > Device discovery error: input stream error > -- Detected Device: B210 > -- Operating over USB 3. > -- Initialize CODEC control... > -- Initialize Radio control... > -- Performing register loopback test... pass > -- Performing register loopback test... pass > -- Performing CODEC loopback test... pass > -- Performing CODEC loopback test... pass > -- Setting master clock rate selection to 'automatic'. > -- Asking for clock rate 16.000000 MHz... > -- Actually got clock rate 16.000000 MHz. > -- Performing timer loopback test... pass > -- Performing timer loopback test... pass > _____________________________________________________ > / > | Device: B-Series Device > | _____________________________________________________ > | / > | | Mboard: B210 > | | revision: 4 > | | product: 2 > | | serial: 312B45E > | | name: MyB210 > | | FW Version: 8.0 > | | FPGA Version: 14.0 > | | > | | Time sources: none, internal, external, gpsdo > | | Clock sources: internal, external, gpsdo > | | Sensors: ref_locked > | | _____________________________________________________ > | | / > | | | RX DSP: 0 > | | | > | | | Freq range: -8.000 to 8.000 MHz > | | _____________________________________________________ > | | / > | | | RX DSP: 1 > | | | > | | | Freq range: -8.000 to 8.000 MHz > | | _____________________________________________________ > | | / > | | | RX Dboard: A > | | | _____________________________________________________ > | | | / > | | | | RX Frontend: A > | | | | Name: FE-RX2 > | | | | Antennas: TX/RX, RX2 > | | | | Sensors: temp, rssi, lo_locked > | | | | Freq range: 50.000 to 6000.000 MHz > | | | | Gain range PGA: 0.0 to 76.0 step 1.0 dB > | | | | Bandwidth range: 200000.0 to 56000000.0 step 0.0 Hz > | | | | Connection Type: IQ > | | | | Uses LO offset: No > | | | _____________________________________________________ > | | | / > | | | | RX Frontend: B > | | | | Name: FE-RX1 > | | | | Antennas: TX/RX, RX2 > | | | | Sensors: temp, rssi, lo_locked > | | | | Freq range: 50.000 to 6000.000 MHz > | | | | Gain range PGA: 0.0 to 76.0 step 1.0 dB > | | | | Bandwidth range: 200000.0 to 56000000.0 step 0.0 Hz > | | | | Connection Type: IQ > | | | | Uses LO offset: No > | | | _____________________________________________________ > | | | / > | | | | RX Codec: A > | | | | Name: B210 RX dual ADC > | | | | Gain Elements: None > | | _____________________________________________________ > | | / > | | | TX DSP: 0 > | | | > | | | Freq range: -8.000 to 8.000 MHz > | | _____________________________________________________ > | | / > | | | TX DSP: 1 > | | | > | | | Freq range: -8.000 to 8.000 MHz > | | _____________________________________________________ > | | / > | | | TX Dboard: A > | | | _____________________________________________________ > | | | / > | | | | TX Frontend: A > | | | | Name: FE-TX2 > | | | | Antennas: TX/RX > | | | | Sensors: temp, lo_locked > | | | | Freq range: 50.000 to 6000.000 MHz > | | | | Gain range PGA: 0.0 to 89.8 step 0.3 dB > | | | | Bandwidth range: 200000.0 to 56000000.0 step 0.0 Hz > | | | | Connection Type: IQ > | | | | Uses LO offset: No > | | | _____________________________________________________ > | | | / > | | | | TX Frontend: B > | | | | Name: FE-TX1 > | | | | Antennas: TX/RX > | | | | Sensors: temp, lo_locked > | | | | Freq range: 50.000 to 6000.000 MHz > | | | | Gain range PGA: 0.0 to 89.8 step 0.3 dB > | | | | Bandwidth range: 200000.0 to 56000000.0 step 0.0 Hz > | | | | Connection Type: IQ > | | | | Uses LO offset: No > | | | _____________________________________________________ > | | | / > | | | | TX Codec: A > | | | | Name: B210 TX dual DAC > | | | | Gain Elements: None > > > > > > On Wed, May 23, 2018 at 3:31 PM, Marcus D. Leech via USRP-users < > usrp-users@lists.ettus.com> wrote: > >> On 05/23/2018 03:13 PM, Martin K via USRP-users wrote: >> >> Hello, >> I have B210 hooked up to a signal generator putting out BPSK. >> When I look at the signal on a signal analyzer I see what I expect: the >> baseband, synchronized 'I' signal looks like a square wave. (Fig.1) >> >> When I capture the signal with the B210 and view it in GNU Radio or >> MATLAB, the square wave is not square, it turns into a decaying square (a >> sawtooth you could say) (Fig 2) >> >> It looks as if the baseband is being highpass filtered. I don't >> understand where this response could be coming from. I hope there is a >> simple explanation. >> >> I considered that the signal may be too powerful, however it is around >> -25dBm and I notice that the effect does not change over different signal >> power levels. >> >> I appreciate any help - thank you. >> >> >> >> >> >> -- >> Martin K. >> >> YOu're going to have to tell us a bit more about your setup. >> >> You're generating BPSK *baseband* and sending it to the USRP? Or you're >> generating a BPSK signal at some RF frequency? >> >> When you say you "capture" the signal, exactly how to you capture the >> signal? >> >> >> >>
-- Martin K.
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