Discussion
Why is the intermediate frequency chosen to fall outside any broadcast band?
Answer: A
If a transmitter operated at the intermediate frequency, the strip could pick it up directly and it would be heard at every dial setting. That is why 455 kHz sits below the medium wave band and 10.7 MHz between the short wave allocations. Component cost, oscillator capacitance and detector time constants do not influence the choice. Standard values usually encode a constraint that is invisible until it is violated, and this is a clear example.
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