If the tuner output impedance is known, you could use a balun transformer of the right type to convert the signal, and get total galvanic isolation as an extra. Also, you need a good lowpass filter because the audio cards sample at 44100 or 48000 Hz and the lowest tuner output bandwidth is surely > 1 MHz.
2013/6/12 Leif Asbrink <[email protected]> > Hello Zilvinas, > > This should work very well:-) > > The IQ signals are balanced and the proper > procedure would be to use a differential > amplifier to convert the voltage difference > between I+ and I- to a voltage difference between > the ground reference and the input of the soundcard. > > You can try just putting a wire from I+ to > the soundcard input. A capacitor in series > might be needed. The simple solution might > add hum and noise near the center frequency. > Such problems are cured with the differential > amplifier. > > Then, do the same for Q:-) > > Regards > > Leif / SM5BSZ > > > > Hi all ! > > > > Please excuse me if this is a bit off topic. > > > > Is there any sense to tap the IQ signals from e4k or r820t to the > > internal or external soundcards. > > Is it possible at all (with r820t particularly) ? > > > > (It could seem like reinventing funcube dongle, bet the > > performance/price would be still right) > > > > Best regards, > > > > Zilvinas > > > > -- Francesco Gugliuzza B.Sc. in Computer Engineering HackLabProject.org Administrator Linux user #374630 Tel (VoIP geographic number): +39 0921440446 Tel (Libera il VoIP number): 5125320 E-mail: [email protected]
