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electronics and communication engineering communication systems
1. If in a radio receiver, RF signal has a frequency of 800 kHz and local oscillator that of 1000 kHz, then at the output of the mixer, the frequencies found would be __________ kHz.
(A): 200, 800, 1000, 1800
(B): 800 to 1000
(C): only 1800
(D): only 200
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