Re: [Discuss-gnuradio] Problems with burn-db-eeprom

[Matt Ettus]

John Stralka wrote:
> I reinstalled the trunk version of GNU Radio, and I was able to successfully 
> burn the RFX 2400 to MIMO A.  The problem I have now is that I cannot seem to 
> get the daughterboard to tune on receive in either a Rev 3 USRP or a Rev 4 
> USRP.  I've verified that it is reporting MIMO A in the USRP Diagnostics 
> within GRC, but when I run usrp_fft.py on the MIMO A board, I get "Failed to 
> set initial frequency".  
>
> I tried putting at MIMO A (side B)  and a MIMO B (side A) RFX 2400 in a 
> single Rev 4 USRP.  Interestingly, I am able to transmit a tone via a MIMO A 
> card and receive it in a MIMO B card.  But I cannot receive the tone 
> transmitted by the MIMO B card on the MIMO A card due to this "Failed to set 
> initial frequency" problem.  The MIMO B board's tone is fine.  This is how I 
> was testing them.
>      ./usrp_fft.py -R B -d 256 -f 2.4375e9 -g 10  & ./usrp_siggen.py -f 
> 2.437550e9 -i 512 --const -T A
>
> When I burned the MIMO A card, I used the following command:
>      ./usrp/host/apps/burn-db-eeprom -f -A -t rfx2400_mimo_a
>
> Is there something I should check?  I'm at a loss on how to proceed.  Any 
> suggestions would be appreciated.  Thank you.
>   

First off, reburning the eeprom is the LAST step in a several step
process to make an RFX board into a MIMO_A board.  The rest of the
procedure is shown here:

    http://gnuradio.org/trac/wiki/USRPClockingNotes

Secondly, why are you doing this?  You have MIMO_B boards which is the
optimal setup.  The only reason to make a mimo_a board is if you want to
use it with a very old rev 3 USRP, which you do not have.

Matt