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A radio without any modulation would simply take the input signal, amplify it, and feed it directly into an antenna. In other words, if $x(t)$ is the signal to be transmitted, and $y(t)$ is the transmitted signal, then we're looking for: $$y(t) = x(t)$$ There are some radios that could work somewhat like this. For example, the part of the radio spectrum ...

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Yes. In fact lots of digital signals already work this way. That's what creates broadband RFI. Hold a cheap AM radio (ferrite antenna) fairly close to a running USB connection, ethernet connection, modulated switching power supply, etc., and you will hear the buzz sent by radio waves directly created by the digital drivers for those signals, no FM or SSB ...

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B210 over USB with stock UHD image can't act like that. Port A is for standard use which is controlled over USB, port B could be used with written custom program inside FPGA. BTW search some info about FULL DUPLEX mode in Open BTS project as for example.

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