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IF filters (the coils, you're calling transformers) are essential for a superhet receiver, because they provide the selectivity. You'll find at least two or three of them with a classical receiver. They may be partly replaced by ceramic IF filters. The IF gain (10e5 or more) is usually distributed among multiple amplifier stages between the filters.
IF filters (the coils, you're calling transformers) are essential for a superhet receiver, because they provide the selectivity. You'll find at least two or three of them with a classical receiver. They may be partly replaced by ceramic IF filters. The IF gain (10e5 or more) is usually distributed among multiple amplifier stages between the filters.
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