![VXO – based PLL frequency synthesizer for 7 MHz VXO – based PLL frequency synthesizer for 7 MHz](https://www.electronics-lab.com/wp-content/uploads/2016/07/vxo1-600.jpg)
Vasily Ivanenko made a VXO-based synthesizer:
To make a VXO to mix with a ~7 MHz VCO, you’ll need a crystal that is higher in frequency than the highest frequency you want to synthesize. Some rummaging revealed a bag of 21.4773 MHz crystals that I could divide by 3 to garner 7.159 MHz.
To afford a reasonable delta F, three were placed in the super VXO fashion and I applied the smallest amount of series inductance that would ensure a reasonable delta F with solid frequency stability.
VXO – based PLL frequency synthesizer for 7 MHz – [Link]
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