SDR Upconverter

Posted on February 20, 2018

This is a very inexpensive upconverter to use an RTL-SDR on HF. It uses a discrete diode ring mixer fed by a crystal oscillator of the user’s choice (recommended 50MHz, 60MHz, or 125MHz). The board can be easily etched at home as it’s only one side, and although the filter components are 0603 size, it can be bypassed and the circuit will still work.

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