I tried to synchronize two USRP2s using external reference (SMA). I input 10-MHz signal to REFCLOCK pin and a trigger in PPS IN.
I modified rx_streaming_samples.cc and wrote the following code u2->config_mimo(usrp2::MC_WE_LOCK_TO_SMA); I use txrx_raw_eth_20100608.bin and u2_rev3-20100603.bin. but I failed to synchronize two USRP2s. I synchronized start timing using PPS but two USRP2's signal have phase difference. This phase difference change every observation. Some figures are attached. In this case, I input RF signals of 130 MHz + 0.05 MHz to RF1 and set as follows: Center frequency: 130 MHz Decimation: 4 When I don't set center frequency, two USRP2's signal don't have phase difference. So I suppose this is due to the phase difference between NCOs of two USRP2. What should I do? Many Thanks. Youhei Wakisaka.
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