I wanted to work with a high stability and accuracy, so I needed a GSPcontrolled 10MHz injection signal into the mixer. I have chosen for the LEOBODNAR miniGPS-Clock reference. It needs 5V so you pick it from the USB bus initially, but later I wanted to build everything in a box, with only 13.5V. I added a 13.5-5V IC to my box, so that problem is also solved.

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