Review on RTL-SDR Blog R820T2 RTL2832U 1PPM TCXO SMA SDR Dongle (Device Only) by Josh Clifton

Interesting technology. Downloading the SDR software was easy, but the sequence of activating three different files to connect the SDR receiver to the network was complicated. Once activated, it is a single file download (SDR#). To get the best display performance, you need a fast computer. I was initially unable to get RF reception until I stopped playback by clicking the square icon, then going to settings and selecting "Q Branch DIRECT SELECT". Then the HF came alive. Hooray. Maybe not as sensitive as we'd like, but it works. The noise floor at 100MHz seems to be higher than usual, but that can only be my setup. Now you can tune in across the spectrum and see what's out there. It looks like 1920's Hartley Super LO technology is giving way to A/D conversion!