The RTL-SDR can receive the carrier signals of high-frequency LTE even at lower frequencies, such as the edge of a 900MHz LTE carrier; the frequency relationship is approximately 3 times. Is this due to the effect of the high-frequency head chip? I'm not sure if it's possible to use this effect to receive the 1090MHz ADS-B signal, especially since the FC0012, which has a default input frequency of 28.8MHz, can only tune to frequencies around 950MHz.
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