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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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closed as too broad by Marcus Müller, rclocher3, Timtech, Mike Waters Dec 10 '17 at 18:59

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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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? $\endgroup$ – Marcus Müller 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
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A software-defined radio (SDR) with appropriate programming can transmit and receive multiple signals inside a given band.

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