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The Analog Devices AD9850 and AD9851 DDSs (Direct Digital Synthesizer) offer an alternative to the Si5351A as a VFO.  Chinese offerings of AD9850 and AD9851 modules vary in price from around $8.00 to $18.00 U.S compared to $8.00 for an Adafruit Si5351A breakout board.  The AD9850/51 has a sine wave output as opposed to the Si5351A square wave output. 

To be continued