The frequency seperation has to be less than the IF channel bandwidth,
using a tune_request, you can make this happen using the DDC to shift
the two frequencies from within the IF bandwidth. Otherwise, no,
there's only a single synthesizer in each direction.
I'll post an example tune_request later.
On 2017-07-28 14:42, Jose Ruvalcaba wrote:
> Hi Marcus,
>
> Thanks for the response. So just to be clear, if I am using the RF:A channel
> Tx/Rx port at say 200MHz, and wanted to also transmit from the Rx:B channel
> Tx/Rx port, then the only frequency I can transmit from the second channel
> would be 200 MHz because both channels are shared right? Is there a known way
> to be able to transmit (or receive) from both channels in a B210 using
> different frequencies ?
>
> Thanks again, Jose
>
> On Wed, Jul 26, 2017 at 6:38 PM, Marcus D. Leech <[email protected]> wrote:
>
> 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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