What is the purpose of the heterodyne going to the Intermediate frequency for AM?
Answer Hi Roger, Your questions delve into a basic understanding of heterodyne receivers. I shall be as brief as possible and reference outside material where I can. Let me preface my further remarks by saying that digitally generated square waves can be good synthesizers (tunable frequency references) but they may have a drawback. That is that their duty cycles may not be exactly constant and therefore, they may contain a small bit of FM. So I guess you have to analyze the method you’re using to generate your square waves to ensure they’re free of that undesired effect. As to your main questions: 1a. You don’t have to have a resonant circuit at the antenna. You don’t even have to have an amplifier. Most modern receiver designs incorporate filters of some kind at their front ends. They can be band-pass, low-pass or high-pass. The reasons for choosing among those depend on what rejection of undesired signals you want to achieve. 1b. Electronically tuning a resonant circuit at the antenn
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