Use A TV Tuner Dongle As SDR
Software defined radios are neat rigs. The can be costly however if you have a TV dongle that uses
the RTL2832U chipset then you are in luck. For $20 you can have a software defined radio. The one
I purchased was from DX.com but any tuner will do. The TV tuners generally do not have the best
receive versus the actual SDR dongles but you cant beat the price.
As of this writing you can purchase the one I did via http://dx.com/p/ezcap-eztv665-dvb-t-usb-2-0-hdtv-tuner-receiver-set-1-x-cr2025-158821.
It does take a while to arrive but worth the wait. Use the following instructions below to install a full SDR setup in Linux. For this demonstration I will be using Linux Mint 13, However any recent debian based distribution should do.
Open a console and lets begin
System PreperationFirst we will install the needed packages and make a folder for all the builds to reside in:
Now install all the support packages we need.
Build and Install GNU Radio
Build and Install RTL-SDR
After this completes you will have a file called "rtl-sdr.rules", using your favorite text editor copy the files contents and append it to "/etc/udev/rules.d/70-persistent-cd.rules"
Building and Install gr_osmoSDR
Building and Install GQRX
A new window will open (the QT compiler). When it opens click the build menu then the build all option. Note this will take a few minutes give or take depending on your system
Plug in your dongle
GQRX Should now be open. On the first run you will be prompted for a device listing. In the device drop down menu select "ezcap USB 2.0 DVB-T/DAB/FM Dongle", then continue to the main GQRX window.
Select File->Start DSP. You should now be receiving something. I found the easiest way to test was to tune to a FM radio station and be sure to select Wide FM Stero as the Mode Type. You should see a screen similiar to below. Adjust gain and other options to play around with it.
Other options are to install a better antenna or a RF amplifier
Cleaning UpI suggest moving and renaming the gqrx folder then removing the SDR folder. For my system I did the following
Now to create a menu so we dont have to launch the console every time we want to start GQRX.
From a console run "sudo gedit /usr/share/applications/gqrx.desktop" ...and place the following in the file, save then close the text editor
You should now have the GQRX program listed in your start menu