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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4$\begingroup$ 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? $\endgroup$– Marcus MüllerDec 9 '17 at 23:58
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$\begingroup$ 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 NU9WDec 10 '17 at 13:35
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A software-defined radio (SDR) with appropriate programming can transmit and receive multiple signals inside a given band.
