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Tunable IF with TDA7000

Tunable IF with TDA7000

Based on Philips TDA7000 receiver chip. It is tuned with a BB105 varicap diode in the 13MHz IF band.
None of the indicator systems was satisfactory, and the actual stability of the receiver oscillator was so good that it wasn’t really necessary either. A simple system with a preset resistor for each of the the desired satellites was more than enough, a simple selector switch to select the channel.

Article by John Coppens ON6JC/LW3HAZ at http://jcoppens.com

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