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Would it be possible to design a circuit that could replace the TXCO (28.8Mhz) of a RTLSDR dongle by replacing it with a signal generated from a 10Mhz reference signal, coming from a GPSDO?

And what kind of components could do the job?

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I would recommend using a PLL chip that is capable of generating a 28.8 MHz output and can do so with a 10 MHz input.

Take a look at http://www.analog.com/en/products/clock-and-timing/plls.html . The ADF4360 could be a good choice.

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  • \$\begingroup\$ One should just remember that phase noise of PLL might be higher than one of the crystal itself. \$\endgroup\$ Commented Apr 26, 2016 at 22:58
  • \$\begingroup\$ Not sure about "might" - it almost certainly is :) \$\endgroup\$
    – M1GEO
    Commented May 18 at 15:24

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