Discussion
The same receiver is tuned to \( 600 \ \mathrm{kHz} \). Its local oscillator runs at
Answer: C
With high-side injection the oscillator always sits one intermediate frequency above the signal:
\[ f_{o} = 600 + 455 = 1055 \ \mathrm{kHz} \]
so 1055 kHz. 145 kHz is the low-side alternative, and it is not used on the medium wave band because the oscillator would then have to cover a far wider frequency ratio. 600 kHz is the signal, and 455 kHz the intermediate frequency. High-side injection is standard precisely because the narrower tuning ratio is much easier to achieve in one oscillator.
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