• Buy TCXO 28.8MHz 28.800M Ultra precision Crystal Oscillators DIP 0.5ppm
• Desolder RTL-SDR xtal

 /-----------\
 | 1       3 |
 | 2       4 |
 +-----------/
(top view)

• Solder:
  • 1 … +3.3V (can be found e.g. on the IR receiver)
  • 2 … not connected
  • For rtl-sdr that used the small rectangular oscillator:
    • 3 … R820T pin 8 (the second in the second row)
  • For rtl-sdr that used the 2-pin THT xtal
    • 3 … the other pin than pin 8 that was connected to the xtal
  • 4 … GND
• Enjoy your 0.5ppm experience!

• When used in constant temperature, the original oscillator and TCXO provide comparable performance (+/- 0.1 ppm over several hours).
• However, increasing the temperature from 28 to 48 °C means 0.14 ppm drift of the TCXO, but 3 ppm drift of the original oscillator.