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Adam Nielsen a.nielsen at shikadi.netHi Steve, > yesterday I committed code for the Rafael Micro R820T tuner to > librtlsdr. That's great! The code Rafael supply doesn't look very neat, and I haven't been able to get a register map out of them either, so great job on getting it to work with librtlsdr. > Sticks with this combination (RTL2832 + R820T) are relatively new on > the market. The main difference to all the other supported tuners so > far is that it uses a Low-IF (3.57 MHz) architecture instead of > Zero-IF. That means the tuner is only connected to the In-Phase ADC > input, and the internal downconverter of the RTL2832 is generating the > complex samples. This has the benefit of having no DC offset spike in > the middle of the spectrum. If I have read the datasheets correctly, the E4000 is also able to use a non-zero IF. Would doing this help reduce the spike in the middle of the spectrum for sticks using the E4000? > 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 1766 > MHz, and indeed both ADS-B at 1090 MHz and L-Band DAB at 1463 MHz, as well 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 the > reception of a GSM 1800 BTS at 1854 MHz worked as well. Wow, this sounds like a really good IC! I might have to go buy one now :-) Cheers, Adam.