Computer Science'S Holy Grail

EE 56 November 1987 Fig. 4 Suggested block diagram of a 0 - 30 MHz converter. aerial input. Connect a 10 MS?, 5 pF scope probe to the RF side of C4. Peak CI for maximum re- jection of the 9 MHz signal. Set the band switch to 80 m, place the scope probe on the RF side of L7, and adjust C7 similarly. A general coverage receiver The unit described can form the tuneable IF section of a 0-30 MHz communication re- ceiver. A suggested block diagram is given in Fig. 4, while the practical circuit of the syn- thesizer can be found in (1). The output of the converter is fed to the 20 m input of the present re- ceiver, whose 80 m input can be omitted. Computer control of the receiver so made is rela- tively simple since all ad- justments are effected by direct voltages, which can be generated with the aid of DACs. Also, the computer is likely to be required in any case for decoding slow-scan transmis- sions, RTTY, morse, or FAX. B Reference: (1) Synthesizer for SW receiver. Elektor Electro...