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|Use Fitlet with RTL-SDR Software Defined Radio Dongle
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|Author:||hassellbear [ Sat Aug 08, 2015 11:47 pm ]|
|Post subject:||Use Fitlet with RTL-SDR Software Defined Radio Dongle|
In around 2010, it was discovered that widely available DVB-T, USB television tuner dongles could be used as inexpensive, yet very capable software defined radios. Since that time, quite a few software packages have been developed which make very good use of the RTL-SDR's capabilities. The available applications include aircraft trackers, fm radios, spectrum analyzers, rf-scanners, etc.
Fitlet works well with the RTL-SDR system.
2. RTL-SDR (DVB-T), USB dongle
Nooelecnanosdr.jpg [ 245.37 KiB | Viewed 4520 times ]
Suitable DVB-T dongles use the Realtek RTL2832U, DVB-T COFDM demodulator ic in conjunction with a suitable wide range tuner ic such as the Elonics E4000 or Rafael Micro R820T.
For this project, I am using the Nooelec NSDR Nano dongle which is available for $18 US including shipping. The Nooelec Nano uses the Rafael Micro R280T tuner which provides a tuning range of 25 - 1700 MHz. The Nano reportedly includes component upgrades designed to provide improved performance as compared to other generic DVB-T dongles.
The rtl-sdr package includes the required librtlsd library and a variety of command line utilities including rtl_test, rtl_sdr, rtl_tcp, and rtl_fm. The command line utilities allow you to test your rtl-sdr setup and implement items such as an fm radio.
A. Using the Package Manager
Using your package manager install the package rtl-sdr
B. From Source
The packages git, cmake, libusb-1.0-0-dev, and build-essential, if not already installed on your Fitlet, are available in the package manager.
To obtain and install sdr-rtl using cmake, execute the following commands in your terminal.
git clone git://git.osmocom.org/rtl-sdr.git
cmake ../ -DINSTALL_UDEV_RULES=O
sudo make install
1. When installing from source, I recommend executing the above commands in /usr/local/src in keeping with somewhat common source installation convention.
2. Running cmake with the with the -DINSTALL_UDEV_RULES=ON argument allows you to use the RTL-SDR dongle as a non-root user.
3. If ldconfig generates the warning /sbin/ldconfig.real: /usr/lib/libEGL.so.1 is not a symbolic link, execute the command unlink /usr/lib/libEGL.so.1; ln -s libEGL.so /usr/lib/libEGL.so.1 as a root user.
To test your rtl-sdr installation execute the command rtl_test in the terminal. For a successful installation, the results should be:
rtl_test.png [ 45.49 KiB | Viewed 4520 times ]
If however, rtl_test returns something like "Kernel driver is active, or device is claimed by second instance of librtlsdr", your installation is using an existing kernel DVB driver instead of the correct driver installed with rtlsdr.
For a temporary fix, unload the incorrect driver using the command:
sudo modprobe -r dvb_usb_rtl28xxu.
For a permanent fix add the line
to the file /etc/modprobe.d
1. The Noolec Nano works well with Fitlet.
2. Fitlet demonstrates its versatility.
http://zr6aic.blogspot.co.uk/2013/02/se ... erver.html
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