详细说明：软件无线电USRP v4.2版本硬件原理图，包括clock、debug board、fpga、interface、power等部分，有pdf、sch、ps等多种格式。
文件列表:
USRP_REV_4_2
............\ChangeLog
............\clock.pdf
............\clock.ps
............\clock.sch
............\dboard.pdf
............\dboard.ps
............\dboard.sch
............\fpga.pdf
............\fpga.ps
............\fpga.sch
............\interface.pdf
............\interface.ps
............\interface.sch
............\power.pdf
............\power.ps
............\power.sch
............\usrp-bom.xls
............\usrp_mboard.bom
............\xy
............\..\bottom-assembly.pdf
............\..\bottom-assembly.pho
............\..\bottom.xy
............\..\camplus.rep
............\..\top-assembly.pdf
............\..\top-assembly.pho
............\..\top.xy
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