Re: [USRP-users] Synchronizing channels in USRP X310

[Marcus D. Leech via USRP-users]

On 07/20/2018 10:29 AM, Hojoon Yang via USRP-users wrote:

Hi, all.

Can anyone confirm this please?

Thanks!

No, you don't need to set the sampling-rate under control of 
set_command_time()


    -----------------------원본메일-----------------------
    보낸사람 : Hojoon Yang via USRP-users <usrp-users@lists.ettus.com>
    받는사람: usrp-users <usrp-users@lists.ettus.com>
    보낸날짜: 2018-07-15 19:36:08 GMT +0900 (ROK)
    제목: [USRP-users]Synchronizing channels in USRP X310

    Hi,

    I'm using a USRP X310 + 2 UBX-160 for 2x2 MIMO application.

    For synchronizing 4 channels(2 TX, 2 RX) in the USRP X310, I read
    the manual[1] and perform the following.

    set_time_unknown_pps()

    set_tx_rate(rate)

    set_rx_rate(rate)

    uhd::time_spec_t cmd_time = usrp->get_time_now() +
    uhd::time_spec_t(0.1);

    usrp->set_command_time(cmd_time);

    usrp->set_tx_freq(1820e6, 0);

    usrp->set_tx_freq(1820e6, 1);

    usrp->set_rx_freq(1725e6, 0);

    usrp->set_rx_freq(1725e6, 1);

    usrp->clear_command_time();

    1. I'm wondering that is this enough for synchronizing 4 channels
    in the USRP X310??

    2. Do I need to set sampling rate simultaneously? Like frequency?
    For example,

    uhd::time_spec_t cmd_time = usrp->get_time_now() +
    uhd::time_spec_t(0.1);

    usrp->set_command_time(cmd_time);

    set_tx_rate(rate)

    set_rx_rate(rate)

    usrp->clear_command_time();

    Thanks.

    [1] https://files.ettus.com/manual/page_sync.html



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