A software-defined radio system, or SDR, is a radio communication system where the components that have been typically hardware (e.g. mixers, filters, amplifiers, modulators/demodulators, detectors, etc.) have there faction replaced by software on a personal computer or similar system.

1. Dexatek Technology Ltd
2. Dexatek

Software Defined Radio using a Realtek RLT2832U USB Digital Video Broadcast -Terrestrial TV (DVB-T) tuner stick or 'dongle' can be used to receive VHF/UHF (64~1700 MHz) in various modes.With one of the familiar SDR application such as SDR# the Realtek RLT2832U dongle can display a 2 MHz section of the RF spectrum between typically about 64 ~1700MHz and demodulate the common modes such as AM, CW, SSB and FM

Download driver Realtek RTL2832U IRHID Driver version 8664.001.0613.2011, v.64.001.0523.2011 for Windows XP, Windows Vista, Windows 7 32-bit (x86), 64-bit (x64). Screenshot of files File Name. Dexatek dk dvb-t dongle driver download Because most of the RTL devices are connected using USB, the librtlsdr library depends on the libusb library to communicate with the device. In order to be able to use the dongle as a non-root user, you may install the appropriate udev rules file by calling sudo make install-udev-rules RelWithDebInfo. Using the RTL2832U driver you could use one of the following compatible USB DVB-T tuners: - Generic RTL2832U (e.g. Hama nano) - DigitalNow Quad DVB-T PCI-E card - Leadtek WinFast DTV Dongle mini D - Genius TVGo DVB-T03 USB dongle (Ver. B) - Terratec Cinergy T Stick Black (rev 1) - Terratec NOXON DAB/DAB+ USB dongle (rev 1) - Terratec. Dta – Driver for DTA products. 32/64-bit device driver for DekTec PCI and PCIe cards. 18MB: Dtu – Driver for DTU products. 32/64 bit device driver for all DekTec USB adapters.

The Realtek RTL2832U USB DVB-T tuners design for the reception of digital TV and FM radio also have the ability to present basic SDR with little effort at a very attractive price.

Dexatek Technology Ltd

The only real hardware is the Realtek RTL2832U dongle of the type pictured below and a suitable antenna. The Realtek RTL2832U dongle come with a number front tuner variants with the most popular being the Elonics E4000 that provides a tuning range of 64~1700 MHz however the dongle shown below in photos 1 and 2 came with a Fitipower FC0012 that presents a tuning range of about 22 - 948.6 MHz also quite useful.

Photo 1 Realtek RTL2832U USB DVB-T dongle

Photo 2 Realtek RTL2832U USB DVB-T dongle. This particular one with the Fitipower FC0012 tuner chip just left of centre.

Fig 1 Tuning ranges of common tuner chips used in the various Realtek RTL2832U USB DVB-T dongles.

The rest of the SDR system is as the name suggests; software. A Software Defined Radio application such as SDR# (read SDR Sharp) and the appropriate drives. The drives are installed used an application known as Zadig.

The easiest approach is to use an automated installer known as sdr-install that will install the SDR# application and Zadig.

Automated Installer

Download sdr-install.zip and unzip it. Double click on the install.bat file in the newly created sdr-install directory to have the script download everything you need including Zadig. It is obviously important to let the script run completely as it appears at times nothing is happening.

Once the script run is completed it will have downloaded the latest SDR#, the latest RTL driver from Osmocom (and enabled use of RTL-USB) and Zadig and put them in a new sdrsharp directory. It will be necessary use the Windows 7zip to extract it from the .7z Zadig It will be necessary use the Windows 7zip to extract the Zadig application from the .7z Zadig file.

Once the the WinUSB driver is installed you are ready to run SDR# with the RTL-SDR/USB input device.

Zadig

When the RTL device pluged in for the first time, Windows may request a driver or automatically install a driver from Microsoft - this is OK as it will be replaced in the next few steps using Zadig. Don't install the software on the CD that comes with the device.

Note that you will need to run Zadig for every USB port you use an RTLSDR dongle in as Windows seems to only apply this driver to the port in question at the time.

The below screen dumps are as experienced when completing the installation process and differ slightly with presentations on other sites.

1. Run the Zadig.exe file and you should see the following.
2. Click on Options drop down and select “List All Devices”. See Fig 1
3. Choose the one that says “REALTEK 2832U (Interface 0) (Interface 0) (Interface 0)”. This should be the primary endpoint of your RTL device. See Fig 2
4. In the box to the right of the green arrow make sure “WinUSB” is chosen - not libusb or libusbk. The big button underneath will say “Replace Driver” or “Reinstall Driver” or “Install Driver”. Before you proceed make sure the USBID matches the VID/PID in the hardware table.See Fig 3 & Fig 3

Fig 2 Choose the one that says “REALTEK 2832U (Interface 0) (Interface 0) (Interface 0)”. This should be the primary endpoint of your RTL device.

Dexatek

Fig 3 In the box to the right of the green arrow make sure “WinUSB” is chosen - not libusb or libusbk. The big button underneath will say “Replace Driver” or “Reinstall Driver” or “Install Driver”. Before you proceed make sure the USBID matches the VID/PID in the Fig 4 Hardware table.

USB Hardware

Fig 4 Hardware table hardware table.

Note that if you insert the dongle into a different USB port you may have to use Zadig again. It seems that you can change which driver is loaded depending on the USB port used. So you could use one USB port for RTLSDR and another port for using the dongle to watch DVB-T with the supplied Windows application.

SDR#

1. Set Radio to WFM (wideband FM)
2. Set the centre frequency to (88,000,000) This is 88MHz, the start of the FM radio band in most countries.
3. Set the 'Front End' type from 'Other' to 'RTLSDR / USB'
4. If all is working the 'Front End' button should go from grey text to black text.
5. Click on Play.

You should now see an orange waterfall display in the bottom half and a dancing blue spectrum in the top half. By clicking and dragging on the blue spectrum you can conveniently change the frequency. In the example below I have dragged the spectrum and centred on an FM station. All going well you should hear the audio coming out of the PC speaker.