On 10/01/2020 12:28 PM, Mark Koenig via USRP-users wrote:
Hello,
I am looking to maximize my MIMO collection utilizing a single X310
radio with either 2 TwinRxs installed or 2 UBX-160s installed.
In some cases, I have a GPSDO at my disposal. For tasking the radios,
I am using python code which creates and runs a GNURADIO Flowgraph.
Ultimately, I would like to know what to set the following parameter
to in order to have the optimal collection. In the instances I have a
GPSDO installed in the X310, I would guess I should choose the GPSDO
option, but what if I don't?
sync (options are: don't sync, unknown pps, PC Clock)
clock source (options are: Default, Internal, External, MIMO Cable,
O/B GPSDO)
time source (options are: Default, External, MIMO Cable, O/B GPSDO)
Thanks,
Mark
You'll have to define what you mean by "optimal collection".
If you're just using a single X310 you don't need to worry so much about
synchronization to external sources--just use the internal/Default
sources, and perhaps choose "unknown PPS" for the sync option.
If you are using TwinRX and want really-good phase-coherence you should
explore the LO-sharing functions, which I don't think are
exposed in GRC.
You might want to read the following ap-note on TwinRX here:
https://kb.ettus.com/Direction_Finding_with_the_USRP%E2%84%A2_X-Series_and_TwinRX%E2%84%A2
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