Hello, I am using two of the "usual" RTL2832-USB dongles, with Ubuntu 12.04. The one with the R820T tuner in it works with both GQRX and SDRSharp (although driving the laptop temperature beyond 60°C - P-Mobile 1,8 GHz, with SDRSharp/Mono only!). The one with E4000 tuner is only accepted by GQRX. SDRSharp says "Array index is out of range", although in the dropdown menu, for both dongles "RTL-SDR / USB" is displayed. Anyone got an idea ...? Lorenz