Re: [Discuss-gnuradio] Re: USRP2 questions

[Matt Ettus]

Kyle Jamieson wrote:
> > Scenario 3 - An arbitrary number of USRP2 systems, no MIMO cables, no HUB
> > Some means of providing the same 10 MHz reference to all USRP2 systems
> > must be set up. Typically this would be the 10 MHz output of some lab
> > reference like a GPS-locked reference. That reference would be put
> > through some sort of active splitter, and fed into all the USRP2s by SMA
> > connector on the front panel
> > Some means of providing the same time reference to all USRP2 systems is
> > also needed. This would normally be a 1 PPS signal generated by the same
> > reference. It will need to go through some sort of active splitter and
>
> Matt,
>
> If the 1 pps signal were a square wave, pulse width 200 ms, with an 
> accuracy of +-130 ns with respect to UTC, would that work with the 
> current firmware installed in the U2?

Yes.

> Also, might an coax F-type active splitter (prob. intended for TV) 
> work?  Or is there an active splitter you can suggest that would work 
> for sure?


You can use a splitter on the 10 MHz reference, but I wouldn't suggest 
using one on the PPS, since that is a digital signal that needs to be 
more than the threshold voltage.  A BNC Tee would probably work better.

Matt