Re: [Discuss-gnuradio] Syncronising multiple USRP2 boards

[Tom Gross]

actually with our configuration we simply synchronize using the MIMO
cable and setting one of the USRP2s to slave its clock to whatever the
other one is using (I forget exactly how this is done but we do pretty
much everything with GRC, so I think it's just in the source block for
the USRP2 - I am not at the location with our system at the moment so
I can't give you a better answer).

I'm pretty sure we are not using an external clock at all.  of course
our configuration is specific to our application requirements - we use
the second (slave) usrp2 to read a signal which is a function of the
master's receive signal and its transmit signal (I am being
deliberately vague).  I know that if I transmit from the master our
system doesn't work (because I tried it).

-Tom


On Wed, Jan 27, 2010 at 9:21 AM, MarcW <address@hidden> wrote:
>
> I would like to synchronise multiple USRP2 boards together. I know I need a
> 10Mhz reference clock and a synchronous 1PPS signal but have a few questions
> regarding the specifics of this,
>
> 1.) The USRP2 FAQ suggests to use a GPS clock but has anybody managed to
> successfully use anything else such as a function generator or other common
> lab equipment?
> 2.) Does the reference clock need to be a sine wave or can it be square
> etc...?
> 3.) What function should the PPS signal be?
> 4.) Do I need to modify the FPGA firmware to enable locking from the
> external signal?
> 4.) Is an active splitter absolutely necessary to use or can i get by with
> passive?
> 5.) Is there a good way to test whether I have correct synchronisation?
>
> Marc.
> --
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>
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