[USRP-users] Re: X310/UBX Tx tuning issue introduced UHD 4.4?

[Marcus D. Leech]

On 09/02/2024 09:07, Rob Kossler via USRP-users wrote:
This is fixed in 4.5 and 4.6.  Are you able to switch?
Rob
I'll add that it's unlikely for the fix to get back-ported to 4.4 at 
this point.



On Fri, Feb 9, 2024 at 5:04 AM <sp...@hs-bremen.de> wrote:

    Hi,

    I am facing the same problem.

    I am on a Linux machine and hardware is an X300 with a UBX160.

    When I am above 500 MHz the actual carrier freq becomes about 2000
    MHz smaller.

    I checked it with the uhd example script  tx_waveforms that comes
    with the uhd install. Below is the output. Note that actual
    frequency is negative. There is no output at 915 MHz on a spectrum
    analyzer. Below 500 MHz everything is fine.

    Same happens when using Gnuradio.

     Thanks

    Soren

    ------------------------------------------------------------------------

    $ ./tx_waveforms --freq 915e6 --rate 5e6 --gain 0

    Creating the usrp device with: ...
    [INFO] [UHD] linux; GNU C++ version 13.1.0; Boost_107400;
    UHD_4.4.0.0+ds1-4
    [INFO] [X300] X300 initialization sequence...
    [INFO] [X300] Maximum frame size: 1472 bytes.
    [INFO] [X300] Radio 1x clock: 200 MHz
    Using Device: Single USRP:
    Device: X-Series Device
    Mboard 0: X300
    RX Channel: 0
    RX DSP: 0
    RX Dboard: A
    RX Subdev: UBX RX
    RX Channel: 1
    RX DSP: 1
    RX Dboard: B
    RX Subdev: Unknown (0xffff) - 0
    TX Channel: 0
    TX DSP: 0
    TX Dboard: A
    TX Subdev: UBX TX
    TX Channel: 1
    TX DSP: 1
    TX Dboard: B
    TX Subdev: Unknown (0xffff) - 0

    Setting TX Rate: 5.000000 Msps...
    Actual TX Rate: 5.000000 Msps...

    Setting TX Freq: 915.000000 MHz...
    Setting TX LO Offset: 0.000000 MHz...
    Actual TX Freq: -1085.000002 MHz...

    Setting TX Gain: 0.000000 dB...
    Actual TX Gain: 0.000000 dB...

    [WARNING] [0/Radio#0] Attempting to set tick rate to 0. Skipping.
    Setting device timestamp to 0...
    Checking TX: TXLO: locked ...
    Press Ctrl + C to stop streaming...

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