![]() ![]() But the funcube has more dynamic, by design. In conclusion, an interesting solution, close to the "funcube dongle" concept, already presented here. It is then possible, through HW modifications, to interpose 2 differental analog baseband filters in order to improve the system in addition to oversampling. For example, if you oversample by 128 around 4 Msamp/s, you will obtain an effective sampling rate of around 31 Ksamp/s, thus a combined I/Q bandwidth of 31 KHz after digital filtering, with an effective number of bits of 8+3,5=11,5 bits (70 dB dynamic).Īnalyze of the used Realtek chipset shows analog I/Q signal if fed to digital A/D-USB chip via 4 capacitors (I/Q differential interface). This is OK for a single signal, isolated from others by physical filtering (TV signal indeed !), but not enough for narrowband multisignal handling (14 to 16 bits being a minimum).Ī solution is to oversample your baseband, and then decimate to increase the effective number of bits. ![]() However, be carefull, you have what you get for 20 $.I/Q interface is 8 bits which means around 48 dB maximum dynamics. While it may not be as cool as 's SDR, it's still very useful and only requires $20 in hardware. With a simple digital TV USB capture card, you can build your own software defined radio or spectrum analyzer. ![]()
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