Vantech RTL2832U R820T DVB-T SDR DAB FM USB DIGITAL TV Tuner Receiver RTL-SDR Project + DAB dongle Tuner For Laptop PC
Sticks with this combination (RTL2832 + R820T) are relatively new onthe market. The main difference to all the other supported tuners sofar is that it uses a Low-IF (3.57 MHz) architecture instead ofZero-IF. That means the tuner is only connected to the In-Phase ADCinput, and the internal down converter of the RTL2832 is generating thecomplex samples. This has the benefit of having no DC offset spike inthe middle of the spectrum.So far the tuner driver comes straight from the kernel driver thatRealtek supplies, and setting gain manually is not supported yet,although functions for that seem to exist.There is still is a lot that needs to be done, the best thing mostlikely would be to completely rewrite the driver, or at least clean itup dramatically. Initializing the tuner takes way too long at themoment, since the driver produces a lot of I2C traffic, most of itbeing redundant as it seems.? The driver originally had a frequency limitation of 40 MHz to 900 MHz,but tests showed that the PLL of my stick can achieve lock up to 1766MHz, and indeed both ADS-B at 1090 MHz and L-Band DAB at 1463 MHz, aswell as GMR at 1556 MHz can be received just fine with the R820T.Also, the PLL could lock again at 1850 MHz to 1860 MHz, and thereception of a GSM 1800 BTS at 1854 MHz worked as well.Some initial comparisons [1] between the E4000 and R820T seem to hintat the R820T being a bit more sensitive, especially visible in theTetra screenshots.?Given that the supply of E4000-based sticks is dwindling, I'm pleasedto see a new tuner that has the potential of becoming a goodreplacement, and staying for a while on the market.?Package:1x remote controller1x antenna1x cd1x mini receiver