heterodyne repeating

heterodyne repeating: ретрансляция по промежуточной частоте, гетеродинная ретрансляция

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Frequency — For other uses, see Frequency (disambiguation). Three cyclically flashing lights, from lowest frequency (top) to highest frequency (bottom). f is the frequency in hertz (Hz), meaning the number of cycles per second. T is the period in seconds (s) … Wikipedia
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