Hi, I am trying to synchronize two USRP N210 devices, one for TX and one for RX. I've followed all of the instructions in the "Synchronizing the Device Time" and "Align CORDICs in the DSP" seconds of the manual (https://files.ettus.com/manual/page_sync.html); however, I'm still not getting complete success.
I can synchronize the two devices only if I use a center frequency of 0 Hz, as shown in the attached cf_0e6.jpg. If I use a center frequency of 10e6 Hz for both TX and RX then there is a phase change between program runs, as shown in the attached cf_10e6.jpg. Each screenshot shows five recordings spaced 20 seconds apart for two runs of the program. Should these results be expected? - If so, can someone explain why there is a random phase offset when using a non-zero center frequency. - If not, what am I doing wrong? I can share my code if that helps. I also tried following the instructions in the "Align Los in the front-end (SBX, UBX)", but that didn't help. I didn't think it would help since I'm using LFTX and LFRX boards. My hardware setup: Transmitter: N210 with a LFTX and GPSDO Receiver: N210 with a LFRX and GPSDO Any help/feedback would be greatly appreciated, Thanks! -Ben
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