What kind of hardware/circuitry would be needed for a device to be able to transmit and receive over a range of frequencies at once?

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    $\begingroup$ This question is really to vague. This could mean independent multi-band, multi-standard operation just as much as it could refer to a single multicarrier transmission. Can you please list an example of what you mean? $\endgroup$ Dec 9 '17 at 23:58
  • $\begingroup$ A repeater listens on one frequency and transmits on another; ham radio transceivers know how to talk to it. But it doesn't sound like that's what you're looking for. $\endgroup$
    – Pete NU9W
    Dec 10 '17 at 13:35

A software-defined radio (SDR) with appropriate programming can transmit and receive multiple signals inside a given band.


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