On 03/06/2018 02:03 AM, Goh Liang Zhen via USRP-users wrote:
> Dear fellow users,
>
>
>
> I intend to put together a 8 channel data collection system using 2
> X310s, each mounted with 2 TwinRXs. With the guidance from the past
> experience in this forum, I have installed the hardware and started data
> collection on a computer running on Ubuntu 16.04 LTS and UHD 3.10.3.0.
> Time and frequency synchronisation were obtained by using the clock and
> PPS from external Octoclock-G, and also timed command for the two X310s
> as source0 and source1.
>
>
>
> However, I realised that as the TwinRXs in different X310s did not share
> LOs, the data collected was not phase synchronised. I am currently
> trying to take LO1 and LO2 from one of the boxes and sharing it with the
> other TwinRXs via an RF splitter. The first TwinRX LOs are set to
> “Internal, True (for export)” and “Companion, True”, while the rest are
> set to “External, False”. I shall refer to the former TwinRX as
> “Master”, and the remaining as “Slave”. The Master is in RX A slot of
> the first X310.
>
>
>
> With this setup, I am able to achieve phase synchronisation repeatedly
> for the Master, and Slaves placed in RX B slot of X310. The Slave place
> in RX A slot of the second X310 has a phase which starts independently
> of the Master.
>
>
>
> Any kind advice of what I am missing to achieve phase synchronisation of
> the last Slave?
Are you maybe accidentally applying the master settings to both Slot-A
dboards?
-- M
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