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friedtj friedtj at free.fr> The e4k does the filtering but has an analog output. The RTL2832 is in > effect an USB ADC. apologies if this is obvious to everyone and has already been posted (I have not checked the whole history of this ml), but indeed by connecting a couple of wires to the I or Q differential inputs of the RTL2832 you do get a fine 2 MS/s oscilloscope. This unfortunate AGC means that DC signals cannot be monitored (even after soldering the wires after the common mode cutoff capacitors), but neverless this does provide a 40 fold sampling rate improvement with respect to the use of sound cards as A/D converters (http://sequanux.org/jmfriedt/199999720input_middle.png and http://sequanux.org/jmfriedt/199999720input_top.png for the I and Q measurements when an input signal of 199.999720 kHz is generated by a synthesizer in order to synchronize with the sampled data, ie the sampling clock is off by 1.4 ppm, not too bad !). JM -- JM Friedt, FEMTO-ST Time & Frequency/SENSeOR, 32 av. observatoire, 25044 Besancon, France