On 07/20/2017 02:23 AM, Jose Ruvalcaba wrote:
Hello,
I'm currently having issues simultaneously transmitting and receiving
data from one B210 to another B210. My goal is to send Tx data from
one B210 and have it be received and re transmitted from a second B210
back to the first. I am trying to use both channels (RF A and RF B) to
simultaneously transmit and receive on both radios. To do this I have
set the "Mb0 Subdev Spec" to "A:A A:B" on both the USRP source and
sink blocks, as I have shown in the flowgraphs attached. My radio can
successfully transmit data from one B210 and have it be received in
the second B210. However, my issue arises when my second B210 tries to
re transmit the received data back to the original B210 (This is shown
if usrp_2_channel.png flowgraph).
My question is, in order to accomplish successful Tx to Rx loopback on
both radios, do I need to label the Subdev spec section as A:A A:B?
Have I labeled the Subdev correctly for a B210 or do I need to change
it? Is it possible for a USRP to transmit and receive simultaneously
on both RFA and RFB channels of a B210? If so, can I do this while
using different frequencies on each channel? Just for completeness I
have both radios connected to each other using coaxial cables with a
38dB attenuation between each path.
Thanks,
Jose
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Jose:
Your basic problem is that on the B210, the synthesizer for BOTH TX
channels is shared, and the synthesizer for both RX channels is shared.
This means that ordinarily both channels have to be tuned to the same
frequency. There are ways to "cheat" if your two desired "air" frequencies
are close together, but in your case, they are 30MHz apart.
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