Re: [USRP-users] two X310 synchronization

[Marcus D. Leech via USRP-users]

On 06/18/2018 10:28 AM, Дмитрий Михайличенко via USRP-users wrote:
The frequency is around 600 MHz. I also tried higher frequencies. The 
offset is visible on picture attached.

thanks,
Dmitry
If you look here:

https://kb.ettus.com/UBX

You can see that for frequencies below 1GHz, you have to use a 20MHz 
daughterboard clock for UBX to achieve synchronization.
  I don't know if SBX will work correctly with a 20MHz daughterboard 
clock, so you can't have "mixed" UBX + SBX on the same
  X310.

Also, integer-N tuning can help maintain better phase synchronization 
characteristics:

https://files.ettus.com/manual/structuhd_1_1tune__request__t.html


пн, 18 июн. 2018 г. в 14:50, Дмитрий Михайличенко <mdm...@gmail.com 
<mailto:mdm...@gmail.com>>:

    Hi,

    I have a couple of X310 each of them has UBX+SBX cards. The
    devices are synchronized by external 10MHz + PPS signal. But in my
    test I see random phase delay between all channels that varies
    between test runs. The test creates multi usrp device, sets up
    time and tunes to the same frequency using timed command, then it
    captures some buffers. The same external signal is supplied to all
    antenna ports. Is it expected to have random delay between
    channels? Is there any way to have constant phase delay from run
    to run?

    thanks,
    Dmitry



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