Compact shortwave 5513 receiver - a direct conversion circuit achieving 'superhet' quality

iSB * SSB * SSB * SSB * SSB * SSB * SSB * SSB * SSB * SSB * SSB * SSB * SSB * SSB * SSB * SSB * SSB * SS 6-16 — elektor june 1982 a direct conversion circuit achieving "superhet" quality Communication receivers are invariably extremely complex and expensive, but in some cases these facts alone, sur- prisingly, do not guarantee good per- formance. When compared to a number of commercial receivers, the Elektor SSB performed rather well, and actually beat some of them "hands down"! oscillator frequency is equal to tl- input signal their sum and differenti products supplied by the mixer at restricted to audio frequency info mation. The audio frequency (AF part of the receiver (section LPF — to pass filter) filters the signal in order t compact shortwave SSB A single side band (SSB) is normally associated with high cost and complexity. This does not always have to be the case! With direct conversion, the RF signal is converted directly into AF without producing an intermediate freq...