|Subject:||Re: [Discuss-gnuradio] Re: USRP2 questions|
|Date:||Mon, 16 Mar 2009 10:28:49 -0700|
|User-agent:||Thunderbird 22.214.171.124 (X11/20090105)|
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 andMatt,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?
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.
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