Yes, I am aware of the 4-channel, but I just forget about it when doing comparison. The explanation behind is that I only have 3 antennas right now, so I am actually working with 3 Rx. About setting Sync to "Unknown PPS", I had tried before, with no result, but I have setted again. However, I have never tried to modify the "start time", which in GNU Radio is -1.0 by default. The interesting thing is that if I try to set a positive value I get the error gr::log :WARN: usrp_source1 - USRP Source Block caught rx error: ERROR_CODE_LATE_COMMAND
El mar, 22 feb 2022 a las 17:15, Marcus D. Leech (<[email protected]>) escribió: > On 2022-02-22 11:08, Alvaro Pendas Recondo wrote: > > I am trying to reproduce the simple example described in > > > https://kb.ettus.com/Synchronization_and_MIMO_Capability_with_USRP_Devices > > (I did first with 2 N210 with a perfect result both with a MIMO cable > > and an octoclock). I am using GNU Radio, so I attach the two schemes. > > Those are, 2 B210 2 Rx that works as well as with 2 N210; and 2 B210 4 > > Rx, where the problem arises. I already knew that B210 is not > > recommended for MIMO with multiple devices, but I was just giving it a > > try. By the way, I also was capable of reproducing the test with one > > B210 and one N210 both synchronized with the octoclock. I also attach > > screenshots showing the problem between signals of two different > > devices (again, this only happens when using 4 Rx, but not when using > > 2 Rx with 2 different B210). > > > Use a synch of "Unknown PPS", and also set the "start time" to 1 or 2 in > your source blocks. Also in the 4-channel flow-graph your lowest > channel has no delay or multiply > blocks in-line, which means it will have (I think) a different > effective group delay compared to the other streams. > > >
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