[Discuss-gnuradio] Multi-Usrp setup

[Douglas Geiger]

I am attempting to get a functioning setup with multiple USRP's working 
here, and am running into some difficulty. I have two recent (rev4) 
USRP's with RFX2400 daughtercards connected to a laptop running Ubuntu. 
I am able to talk to either individually (using usrp_fft.py, and other 
example code, etc.), but cannot get the multi_usrp_oscope.py program to 
work.  I have connected the boards using a coax cable into an SMA 
connector on J2002/2001 as described at 
http://www.gnuradio.org/trac/wiki/USRPClockingNotes
According to that same page recent RFX boards do not require additional 
connectors, so I assume I am set with regards to connectors.
However, when I run multi_usrp.py (once selecting the master serial 
number - it does not appear to matter which one I select as master), the 
scope screen comes up but does not display anything (all the buttons, 
etc. are there, but nothing appears in the graph).  Attempting to exit 
hangs the program, and I have to kill it manually (i.e. kill -9 <pid>).

I was running this with gnuradio-3.1.2 (on an ubuntu - hardy heron 
install).  I have also tried using the latest svn code (after modifying 
the code to use toplevel/hier_block2 - which I was having trouble 
getting working).

Any suggestions, or hints?
Thanks,
 Doug