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Re: [Discuss-gnuradio] usrp rev 3

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] usrp rev 3
Date: Wed, 07 Feb 2007 17:50:09 -0800
User-agent: Thunderbird (X11/20070104)

Dan Halperin wrote:
> Matt Ettus wrote:
>> All RFX boards currently shipping are configured for MIMO_B mode, which
>> requires a Rev 4 or higher USRP (serial number greater than 500).
>> If you wish to use it with a USRP with a serial number below 500 you
>> 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 rfxYYYY_mimo_a
>>             where YYYY is the board you have (i.e. 400, 900, 1200, 1800,
>> or 2400).
> Perfect! Two questions:
> What's the difference between MIMO-B and MIMO-A?
> I assume burning the eeprom is undo-able (redo-able, I suppose)?

MIMO_B uses the 64 MHz oscillator from the motherboard (only on the
newer ones), and is cleaner.  MIMO_A uses an FPGA pin as a clock so it
isn't as clean.


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