Upgraded R820T2 tuner chip. Various comparisons on the web have concluded that the R820T2 tuner has better performance over the original R820T, including more sensitivity and lower noise floor. Results may vary depending on your application and local conditions.
RTL-SDR Blog V3 R860 (R820T2) RTL2832U 1PPM TCXO SMA Software Defined Radio (Dongle Only) – RFCharge
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SMA Software Defined Radio RTL-SDR Blog V3 RTL2832U 1PPM TCXO HF BiasT SMA Software Defined Radio R820T2 H3 - AliExpress
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RTLSDR calibration - which reading to believe?
RTLSDR calibration - which reading to believe?
Nooelec NESDR Mini USB RTL-SDR & ADS-B Receiver Set, RTL2832U & R820T Tuner, MCX Input. Low-Cost Software Defined Radio Compatible with Many SDR Software Packages. R820T Tuner & ESD-Safe Antenna Input
RTL-SDR Blog R820T2 RTL2832U 1PPM TCXO Software Defined Radio (Dongle only)-DENUOTOP