12

Advanced architectures

The general principles of several types of receiver have been described in Chapter 11, and briefly recapping, they all fall under the two main headings of TRF (tuned radio frequency) receivers, where the received signal is processed at the incoming frequency right up to the detector stage, and the superhet (supersonic heterodyne) receiver, where the incoming signal is translated (sometimes after some amplification at the incoming frequency) to an intermediate frequency for further processing. There are however, a number of variants of each of these two main types. Regeneration (‘reaction’ or ‘tickling’ - the American term) may be applied in a TRF receiver, to increase both its sensitivity and selectivity. This may be ...

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