There are many SDR programs, this is just one.
Sound card
There is a designer who has very good SDR circuits, the main idea is to keep the hardware in simplest form and I think he succeeded.
The link to his page is
YU1LM site
To those who are interested in radio equipment this page has very interesting things.
I think some boards can be assembled by $ 10 -.
RTL820 Dongle
I am now writing the driver for these dongles. Be patient
by now you can visit this interesting page
Osmocom page
