e4000 r820t signal output

Leif Asbrink leif at sm5bsz.com
Wed Jun 12 15:20:09 UTC 2013

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 

Then, do the same for Q:-)


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

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