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.
MOUDOAUER R820T2 RTL2832U 1PPM TCXO SMA Software Defined Radio USB Dongle for RTL-SDR Blog Accessory : Electronics
NooElec NESDR XTR+ Tiny Extended-Range TCXO-Based RTL-SDR & DVB-T USB Stick (RTL2832U + E4000) w/Antenna and Remote Control : Electronics
RTLSDR calibration - which reading to believe?
RTL-SDR Blog V3 R820T2 RTL2832U 1PPM TCXO SMA RTL SDR Radio Software Only without Accessories - AliExpress
Sairis RTL-SDR Blog V3 RTL2832U 1PPM TCXO HF BiasT SMA Software Aluminium shielded case Defined Radio R820T2 tuner : : Computers & Accessories
RTL SDR Receiver V3 Pro with Chipset Rtl2832 Rtl2832U R820T2 for Ham Radio SDR RTL for 500 Khz-2 GHz UHF VHF HF AM FM - AliExpress
RTLSDR calibration - which reading to believe?
A cheap radio and the perfect device to learn software defined radio. Ham radio, ADS-B, police and fire scanning, trunking, satellite imagery - you name it, this little guy can probably do it. Better than many devices at 10 times its cost! Build Details This custom NooElec SDR is a modified DVB-T USB dongle tuned for SDR, including an upgraded crystal, capacitor, and inductor. Devices like those sold by competitors. This lowers the noise floor, improves stability, and increases longevity.
Nooelec NESDR Mini USB RTL-SDR & ADS-B Receiver Set Rtl2832u & R820T Tuner MCX Input Low-Cost Software Defined Radio Compatible with Many SDR
SMA Software Defined Radio RTL-SDR Blog V3 RTL2832U 1PPM TCXO HF BiasT SMA Software Defined Radio R820T2 H3 - AliExpress
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NooElec NESDR Smart XTR SDR - Premium RTL-SDR w/Extended Tuning Range, Aluminum Enclosure, 0.5PPM TCXO, SMA Input. RTL2832U & E4000-Based Software Defined Radio : Electronics
RTL-SDR Blog V.3. Dongles User Guide
Dongle RTL-SDR.com V3 TCXO + SMA + Bias-T USB key with R860 tuner