 the FiFi SDR for shortwave, or the Quadrus coherent multi-channel SDR receiver for short wave or VHF/UHF in direct digital mode of operation.It has been discovered by Eric Fry that some common low-cost DVB-T USB dongles with the Realtek RTL2832U controller and tuner, e.g.the Elonics E4000 or the Rafael Micro R820T, can be used as a wide-band (3 MHz) SDR receiver.