Explore Software Defined Radio on a Budget

The results of their work include creative front-end hardware design, using baseband interfacing with high performance personal computer sound cards, supported with signal processing, decoding and display software. For a very small investment (and a good personal computer) it is possible to obtain a receive-only SDR system, with several options for monitoring and decoding software. Typically, the radios are configured as I and Q direct-conversion demodulators, with the two baseband output channels fed to the inputs of a high quality, high sampling rate audio sound card. Currently, sound cards are readily available with a 96 kHz sampling rate, with 192 kHz sampling rate cards available at slightly higher prices. The bandwidth that can be processed is approximately one-half the saming software. Typically, the radios are configured as I and Q direct-conversion demodulators, with the two baseband output channels fed to the inputs of a high quality, high sampling rate audio sound card. Currently, sound cards are readily available with a 96 kHz sampling rate, with 192 kHz sampling rate cards available at slightly higher prices. The bandwidth that can be processed is approximately one-half the sampling rate, so a 192 kHz sound card can be used for digital processing of a 96 kHz slice of the radio spectrum.