Angelia_v1.7.rbf is the executable file that you load using HPSDRProgrammer. Angelia_v1.7.qar is the archive source code file for use with Quartus II if you want to access the Verilog code. 73, Joe K5SO On May 8, 2013, at 4:31 PM, Pat McGrath wrote: > Great > > Why two files? > > Pat > Ka6tya 1368052604.0