General-coverage receiver

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< Micro-D/Pascal/Avr ~ General-coverage receiver - part 1

eric

Posted: Wed Aug 30, 2006 9:38 am Post subject: General-coverage receiver - part 1

Site Admin Joined: 01 Jan 1970 Posts: 311

This twopart
article
describes an
AM/FM/SSB
receiver for the
frequency range
0.15 – 32 MHz,
which is generally
(but incorrectly)
referred to as ‘the
shortwave bands’.
The receiver is microprocessor
controlled
and avoids many of
the pitfalls traditionally
associated with RF
construction.
Main Specifications
➧ Double conversion superheterodyne receiver, 1st IF 45 MHz,
2nd IF 455 kHz
➧ Microprocessor control of synthesizer tuning and other receiver
functions
➧ 150 kHz to 32 MHz tuning range in 1-kHz steps.
➧ Selectable selectivity: 3 kHz (narrow) or 12 kHz (wide)
➧ Internal 6-band preselector with automatic band switchover
➧ 12-key keyboard for frequency entry,
mode and bandwidth selection
➧ 16-character LCD shows receive mode, bandwidth, frequency
and preselector band
➧ Memory for 21 frequencies, incl. bandwidth and mode
➧ Spurious product rejection >50 dB
➧ Audio output power approx. 1 W into 8 Ω.
➧ Power supply 15 V, max. 400 mA (approx. 90 mA without audio
and LCD backlight)

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