[USRP-users] Power decrease and phase coherence in USRP 2945

2020-12-02 Thread Pisonero-Fuentes David (Becario) via USRP-users
Hi. We have developed a project using the USRP 2945 and UHD libraries to estimate a signal's direction of arrival. In this project, the four channels of the USRP 2945 are connected through a power splitter to a function generator, and the local oscillators in the back are connected following

Re: [USRP-users] Can I detect a wiretype of USB device?

2020-12-02 Thread Mikio Fukushima via USRP-users
Hi Marcus, Thank you for your mail. I done based on your information as follows. >> code here << uhd::usrp::multi_usrp::sptr usrp = uhd::usrp::multi_usrp::make(args); string devicename = usrp->get_device()->get_tree()->access("/mboards/0/name").get(); double maxrate = usrp->get_device()->get_tr

[USRP-users] Questions regarding tx_waveforms

2020-12-02 Thread Carlo Venier via USRP-users
Hi, I have a few questions regarding tx_waveforms script. I'm using an USRP B200mini. How can I delete (or reduce) the DC component when using tx_waveform? When I set --freq=f0, specifying --lo_offset=(df0), how do I remove (or reduce) the mirrored replica at (f0+2*f0) that is generated? Do you

Re: [USRP-users] Questions regarding tx_waveforms

2020-12-02 Thread Rob Kossler via USRP-users
Hi Carlo, Your questions are about 2 calibrations: DC offset (affects DC component) and I/Q gain/phase calibration (affects mirrored spectra). My understanding is that the B200 calibrations are handled automatically such that there is nothing to do from "tx_waveforms" or even from direct UHD API c

Re: [USRP-users] Questions regarding tx_waveforms

2020-12-02 Thread Marcus D Leech via USRP-users
Try reducing the baseband signal magnitude and RF gain—does that reduce the unwanted harmonic content? What offset value are you using? I typically use a value that is a bit more than half my application bandwidth. Some Amount of unwanted mixing and distortion products are *inevitable* with an

Re: [USRP-users] DPDK with UHD 4.0

2020-12-02 Thread Jonathon Pendlum via USRP-users
Hi Dario, UHD 4.0 requires DPDK 18.11, but Ubuntu 20.04.1 packages version 19.11. See the UHD manual for how to build version 18.11: https://files.ettus.com/manual/page_dpdk.html#dpdk_installation. Jonathon On Tue, Dec 1, 2020 at 7:59 AM Dario Pennisi via USRP-users < usrp-users@lists.ettus.com>