Re: [Discuss-gnuradio] USRP2 &DBSRX testing

[Matt Ettus]

Bob Taylor wrote:
> Matt,
>
> I'm also attempting to get a DBSRX working in a USRP2, and am looking
> forward to obtaining the instructions and code. Any chance they're already
> available somewhere and I missed them?

Sorry for the delay.

This will only work if you have a DBSRX which says "Rev 2.2".  This 
should be most units from 2007, and everything from 2008 or 2009.  It 
will not work with older DBSRX boards.  For those, there is no way to 
use them with the USRP2.

There are 2 steps to the process:

1 - Put the DBSRX on a USRP1 on Side A, connect it to a computer, and 
run the command:

        burn-db-eeprom -A --force -t dbsrx2


2 - Remove R193 (which is 10 ohms, 0603 size) and put it on R194, which 
is empty.  This is made somewhat more complicated by the fact that the 
silkscreen is not clear in that area.  R193 is on the back, immediately 
below the large beige connector, J2.  R194 is just below, and to the 
left of R193.  The silkscreen for R193 is ok, but for R194, it is upside 
down, and partially cut off.

If you lose R193, you can use anything from 0 to 10 ohms there.

Matt