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The superheterodyne idea
A superheterodyne receiver mixes a selected radio signal with a local oscillator. The resulting signals include sum and difference frequencies; a designed intermediate-frequency stage selects the intended one.
The exact intermediate frequency varies by receiver. Do not assume a common example applies to every model. Alignment is a controlled procedure using the service manual and suitable instruments, not random adjustment of coils.
Worked example
An illustrative 1000 kHz signal and 1455 kHz oscillator have a 455 kHz difference. This is an example, not a universal setting.
Try it yourself
Calculate the difference between 1200 kHz and 1655 kHz.
Check your understanding
What is 1655 − 1200 kHz?
Subtracting the two example frequencies gives 455 kHz.
References and further reading
Lessons and examples are original introductory material. These references offer further study; their material is not included as a copied course.
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