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Superhet Radio TutorialAlthough the basic idea for the superhet or superheterodyne radio receiver works very well, to ensure the optimum performance under a number of situations, an extension of the principle, known as the double superhet, or double superheteroyne radio receiver may be used. https://heuristic-mccarthy-27d822.netlify.app/Garageband-Ipad-Vs-Macbook-Review.pdf
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However, it is possible to achieve very high levels of performance with a double superheterodyne or where particularly needed a triple superheterodyne radio receiver.. The additional circuitry needed adds cost, and to minimise the occurrence of spurious signals within the receiver, the design must be undertaken with care.. Typically the receiver will convert the incoming signal down to a relatively high first intermediate frequency (IF) stage.. Triple conversion superheterodyne receiverThe double superheterodyne radio receiver is normally found where high levels of performance are required.. Basic double conversion superheterodyne receiver conceptOnce the signal has passed through the first IF at the higher frequency, it is then passed through a second mixer to convert it down to a lower intermediate frequency where the narrow band filtering is accomplished so that the adjacent channel signals can be removed. Click
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Reason for using double superheterodyne radio receiverWhen choosing the intermediate frequency for a superheterodyne radio receiver there is a trade-off to be made between the advantages of using a low frequency IF or a high frequency one:Accordingly there are two conflicting requirements which cannot be easily satisfied using a single intermediate frequency.. The double superheterodyne radio receiver is still widely used, especially at high frequencies where factors such as image rejection and filter performance are important. 5