Preselector for Elektor SDR
Here’s the automatic tuning upgrade!
Published in issue 396, December 2009
The performance of a receiver depends to a large extent on its input filters. A selective input circuit improves antenna matching and immunity to interference from other strong signals. The preselector described here allows the use of up to four filters, tuned under software control using varicap diodes. A tuned loop antenna is also described that lets you use the Elektor SDR receiver without an outdoor antenna.
Features - Four tuneable front-end circuits
- Controlled by free SDR tuning software
- I²C bus control
- Long-, medium- and short wave reception
- 500 pF varicap diodes
- Suitable for use with a wire antenna, a loop antenna or a ferrite rod
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Click below to download a PDF copy of this article from Elektor magazine.
Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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