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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