hi,everyone:  as i am new to RF pcb layout , i want the USRP daughter board PCB 
file to reference,i found a floder at 
"/root/usrp-hw"(http://gnuradio.org/redmine/projects/gnuradio/repository/revisions/8c8eeca9e2ae26c30f186bef23411d345acbc3f6/show/usrp-hw)


but i found some of those pcb files are created by gEDA(like tvrf.pcb).but 
others like rfx900.pcb,i wonder they are created by which tool?
as i tried,they are not created by those tools: altium 
designer/protel/gEDA/powerPCB.


plz help me if you know how to open them,thank you.


nail.
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