A simple direct conversion receiver for the 7 MHz band. Scheme, description

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A simple direct conversion receiver for the 7 MHz band. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / radio reception

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A simple direct conversion receiver for the 7 MHz band was proposed by G-QRP club member Ernst Olivier, F5LVG. A local oscillator was assembled on the double-gate "field" BF960, a mixer on the D1D2 and on the TDA2003-ULF. L1C1-band circuit tuned to 7050 kHz.

(click to enlarge)

Standard chokes are used as L1 and coupling coil L2 (preferably in leadless micro-version).

By selecting the distance between L1 and L2, the necessary connection of the mixer D1D2 with the input circuit is established.

Author: Ernst Olivier; Publication: N. Bolshakov, rf.atnn.ru

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