Hi,

What I want to do is try to use the two antennas of SBX simultaneously.

The TX/RX is used for duplex communications and the RX2 is for sensing. The
two antennas are working different frequencies.
But this solution seems to be unfeasible, as someone said the receiver
chain of SBX is the same. The TX/RX and RX2 can not work simultaneously.
As suggested in the community, I am trying to using 3 frequecies on one
antenna (TX/RX): f1, f2, f3.

f1(tx) and f2(rx) are used for FDD duplex communications,and f3 is for
sensing path. And f2 and f3 are within the 40MHz difference.

My problem is how to set it in USRP source block for this kind of
configuration? Does anybody has such example? And I met the error like
below:

Runtime error:vector::_M_range_check

which seems to be caused by incorrect setting of subdev. However, I don't
know what the valid value fo subdev in such kind configuration.

-- 

Alex,
*Dreams can come true – just believe.*
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