Dvb T Tuner Software

I have a USB 2.0 Digital DVB-T SDR+DAB+FM HDTV TV Tuner Receiver Stick model (RTL2832U+R820T2) and wish to listen to FM radio via my PC, however I seem not to be able to find the right software to do.

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Windows Mediacentre is rapidly becoming the only software unable to record multiple channels from each DVB tuner For the record: I have 2 DVB-T single tuners, a 7010ix with 2xDVB-T+2xDVB-S tuners and only the 4 DVB-T are enabled. Aerial TV is an offline receiver for DVB-T and DVB-T2 signals via a USB tuner. You don't need data plan or WiFi connection. Aerial TV works by picking up local digital signals off the air with a regular antenna. It supports MPEG2, MPEG4 and HD reception where available and offers EPG functionality. You will need a low cost USB tuner hardware. You can grab one online for less than €10. I realized that people are using cheap DVB-T tuner based on Realtek RTL2832U chip as spectrum analyzer, SDR (software defined radio) and even as osciloscope. There were many situations in my hobby when this brilliant device could help a lot. How to use DVB-T/DAB RTL2832 based USB receiver with HDSDR Hardware requirements: - DVB-T/DAB USB dongle with Realtek RTL2832 chipset (sometimes badly named as RTL2838) - PC with Dual Core CPU, Soundcard, one free USB 2/3 port Software requirements: - Microsoft Windows XP or newer, latest Service Pack required!!! (XP=SP3, Vista=SP2, Win7=SP1). I've got a standard DVB-T tuner but need the software for it to run on (for watching the TV programmes). I know about Windows Media Center, but are there any other alternatives that are any good? They need to be able to let the user watch Freeview/DVB-T from a USB tuner, and they also need to be free (no subscriptions or payware). DVB-T is not the only DVB available. The Digital Video Broadcasting Project — a group of nearly 300 broadcasters, network operators, and software makers that since 1993 has designed global open standards for digital television transmissions — has created other formats as well.

Few weeks ago I stumbled upon some topic on one of FPV forums about checking frequency, spectrum, antennas etc. I realized that people are using cheap DVB-T tuner based on Realtek RTL2832U chip as spectrum analyzer, SDR (software defined radio) and even as osciloscope.
There were many situations in my hobby when this brilliant device could help a lot. This discovery was so hot, so I decided to buy such usb dongle ASAP, even at slightly bigger price (55zł ~ $16) than directly from China. I found it in one shop in my town and next day I became happy owner of this tuner 🙂

This is Lifeview LV5T Deluxe (branded as NOT ONLY TV):

It’s equipped with a little different tuner than described on rtlsdr/osmocomSDR site, Fitipower FC0013 capable of working within 22-1100MHz frequency range:

To be clear: I use Linux 🙂
First step was to download and install rtl-sdr library from http://sdr.osmocom.org/trac/wiki/rtl-sdr . In this package there are also ready made udev rules to install, so root access is not required later for using it.
On this web page one can find also links to some related projects using this library.
Next step was to get pyrtlsdr library for Python as most of these project are written in that language. After installation of few more dependencies as wxPython, numpy, matplotlib etc I started testing software 🙂

RTLSDR-Scanner

My first application was RTLSDR-Scanner. Kind of old school, well known spectrum analyzer:

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Easy to operate, with zoom but capable to scan only within range of whole MHz, so scan in narrower range than 1MHz is not possible (you could zoom, but it doesn’t enhance frequency resolution).
So, it was quite good, but I needed more 🙂

rtlsdr-waterfall

Waterfall applications is a real power of computerized spectrum analyzer!
This very easy Python script is more than useful.

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For example, scan of commercial FM radio frequencies – all in one:

And situation when waterfall shows it’s power – 433MHz ISM band scan with some devices transmitting only during small window of time (on the left it’s probably wireless sensor for weather station):

And back to R/C 🙂 My 40MHz transmitter:

You could select and measure frequency range, make pan and zoom (but on lower frequencies application crash during zooming), change sesnsitivity of tuner to remove clipping and additional strips caused by this.

Audacity

Yes, you are reading right: Audacity – well known audio editing program. I made a little patch (not perfect) to allow change sample rate up to 10MHz because default maximum was 100kHz and typical rtl-sdr sample rate is about 2MHz, so selection tool and fft features are not working correctly.
Using rtl_sdr utility from rtl-sdr library, I dumped raw samples near desired frequency and then I imported it as raw 8 bit stereo samples into Audacity. Below are results:-)

My 35MHz transmitter on 71 channel. I have little problems with range on this channel and this picture shows why:
On this image you can see:

  • this is 5 channels radio (6 peaks of synchronization pulses)
  • main frequency is shifted by about 5kHz from sampling base i.e. channel frequency – and it’s cause of poor reception
  • deviation is about 3kHz (to about 8kHz from center of channel)

Using quartz for 63 channel it works much better from my experience and below is proof of this:
Shift from base frequency is less than 3kHz, so it’s better than on 71 channel.

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For comparision, my simple 4 channel 40MHz transmitter:

Very tempting looks SDR# (available also on Windows) but require a lot more weird dependencies, so I put it for later.
But I’m sure that this topic will return some day with more new cool informations 🙂

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Update 2013.06.22: second part is here.