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Preselector for SDR
When working with the SDR Elektor I found this HW could be improved with some additional circuit.
The SDR Elektor already provides an USB to I2C support on its board.
So it was quite easy to extend it with:
- HF Attenuator
- HF Amplifier
- HF tuned Filter Preselector
Everything was managed by the onboard I2C chip and my software in the SDR Navigator.
Attached you find the circuit schematic of this automatic preselector.