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What stage in a transmitter would change a 5.3-MHz input signal to 14.3 MHz?
A mixer
To change 5.3 MHz to 14.3 MHz, a mixer can be used. If 5.3 MHz is mixed with a local oscillator of 9.0 MHz, the sum frequency is 14.3 MHz (or if mixed with 19.6 MHz, the difference is 14.3 MHz).
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