Si5351 ocxo. Three versions of the . The QRP Labs OCXO/Si5351A-based synthesizer module can generate up to 3 different square-wave frequencies simultaneously in the range 8kHz to 160MHz with 50-ohm output impedance. A small problem that needs to be solved first is that OCXOs usually operate at 10MHz and the Si5351 needs an oscillator with a frequency between 25MHz and 27MHz. Based on a PLL/VCXO + high resolution MultiSynth fractional divider architecture, the Si5351 can generate any frequency up to 200 MHz on each of its outputs with 0 ppm error.
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