[Discuss-gnuradio] Question regarding Basic Tx/Rx Boards

[mkhan]

Hi.

I have two questions:

1.) Is there any difference between the Basic Tx/Rx daughter boards that
were shipped with rev3 usrp board and rev4 usrp board?

2.) What is the functionality of .ihx (firmware file)? How is it different
from the fpga (.rbf) file?

Thanks.
Owais