<< First off, reburning the eeprom is the LAST step in several step
process to make an RFX board into a MIMO_A board. >> … yes, as I
mentioned in my post from 7/30/07, I made the modifications that you
provided in a post from 2/7/07, where you stated:
All RFX boards currently shipping are configured for MIMO_B
requires a Rev 4 or higher USRP (serial number greater than
If you wish to use it with a USRP with a serial number below 500
will need to do the following:
Remove R115 (zero ohms) and place it at R116 Remove R36 (zero ohms) and place it at R34 Put the RFX on a USRP (side A) and run the following: usrp/host/apps/burn-db-eeprom -f -A -t
where YYYY is the board you have (i.e. 400, 900,
1200, 1800, or 2400).
<< 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. >> …
I’m trying to create a comm link between two RFX2400 daughterboards. I
noticed that there is a significant amount of RF leakage between two
daughterboards within the same USRP enclosure. Therefore, I wanted to
seperate them into two separate USRP’s. I have an USRP with a Rev 4 PCB
(2/17/07, Ser #1263) . The only other USRP that I have access to has a
Rev 3 PCB (1/3/05, Ser #409), which according to your 2/7/07 post
requires the corresponding RFX2400 to be modified for MIMO_A operation.
Is this correct?
In order to use one of my RFX2400 daughterboards with the Rev 3 USRP I
have successfully done the following:
Remove R115 (zero ohms) and place it at R116 Remove R36 (zero ohms) and place it at R34 Put the RFX on a USRP (side A) and run the following: usrp/host/apps/burn-db-eeprom -f -A -t rfx2400_mimo_a
I can transmit from the Rev 3 USRP, but I cannot receive on it. It
seems to have a tuning problem.
I would appreciate any help. Thank you.
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:
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.
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