Replacing the Low Quality 28.8 MHz Oscillator on the RTL-SDR

The 28.8 MHz crystal oscillator on the RTL-SDR is known for being low quality. A low quality crystal means that the frequency tuning can be off by a few KHz and can cause the tuned frequency to drift over time.

In this article of the GBPPR ‘Zine (kindly mirrored by superkuh), the authors show a tutorial on how a cheap high quality 14.4 MHz temperature compensated crystal oscillator can be combined with a frequency doubler circuit to create a high quality 28.8 MHz clock source, which can then be used to replace the low quality oscillator on the RTL-SDR. A 14.4 MHz oscillator is used as high quality 28.8 MHz oscillators appear to be rare.

Frequency Doubler Circuit

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Hello,please pcb printed on this article of the GBPPR ‘Zine 28.8 MHz oscillators ?


There’s a guy who sells 28.8MHz TCXOs. Link


Perhaps the Fox Electronics ‘FXO-HC735R-28.8’ 28.8 MHZ 3.3V HCMOS SMD oscillator’s 50 PPM (1.44 kHz) at -40°C ~ +85°C with -120 dBc phase noise figure would be adequate