On Tue, 19 Apr 2011 11:41:46 -0700, Matt Ettus <address@hidden
> On 04/19/2011 11:38 AM, Colby Boyer wrote:
>> Hi All,
>> In RFID applications, a reader receives (backscatter from RFID tag) and
>> transmits (constant tone) at the same frequency. With commercial
>> readers, a single LO will be shared by the RX and TX chain. However, in
>> the USRP case, two separate daughter boards are used so different LOs
>> are in use for the RX and TX chain. So you should end up with some
>> frequency offset in RX chain due to mismatched clocks.
>> Is it possible to lock the LOs of a TX daughter board and a RX daughter
>> board, as you would for a traditional MIMO 2 TX or 2 RX setup? There
>> appears to numerous discussions and examples of the latter. I'm thinking
>> it would be possible. But I'm more of a systems guy and less of a RF
>> hardware guy, so any comments would be appreciated.
> As long as you set them to the same frequency, they're already locked.
> No need to do anything different.