gnuradio Archives - Page 2 of 9

RTL2832U based software defined radios

August 22, 2016April 2, 2012 by Alexandru Csete

RTL2832U-based DVB-T dongles are now supported by Gqrx SDR, see this announcement!

You may have noticed the recent buzz on the internet about using cheap DVB-T dongles as software defined radio receivers. It all started on this mailing list when V4L/DVB kernel developer Antti Palosaari discovered that the ezcap EzTV 668 DVB-T/FM/DAB USB dongle, which is based on the RTL2832U chip, can be used to stream raw I/Q samples to the host computer. It is in fact the way the device supports FM and DAB reception; raw I/Q is sent to the host where the application does the demodulation.

Gqrx and Pulseaudio

August 22, 2016March 31, 2012 by Alexandru Csete

Just a quick note that Gqrx now uses pulseaudio for all audio I/O, which includes I/Q input from the Funcube Dongle.

Funcube Dongle support now built into GNU Radio

August 22, 2016March 23, 2012 by Alexandru Csete

I am happy to inform all users of the Funcube Dongle and GNU Radio, that the gr-fcd driver is now included in the GNU Radio source tree. You can read the announcement here. This change will be available in the next GNU Radio release, which I think will be 3.5.3, however, if you pull the … Read more

Butternut HF2V on 10 and 15 meters

August 22, 2016December 4, 2011 by Alexandru Csete

Two recordings I made during the 2011 CQ WW CW contest showing how well the Butternut HF2V receives on the 21 and 28 MHz bands. The videos were recorded using the Funcube Dongle equipped with the HF converter kit and my GNU Radio based software defined radio receiver, GQRX.

Howto receive and decode NOAA APT images with the Funcube Dongle and Gqrx

August 23, 2016August 31, 2011 by Alexandru Csete

One of the great advantages of software defined radio receivers is that tuning receiver settings is a matter of adjusting software parameters. Gqrx is no different here and has optimal settings built in for weather satellite reception. This tutorial describes how to receive automatic picture transmissions (APT) from NOAA weather satellites using Gqrx SDR, record them to a WAV file, and finally decode the images using the free and open source Atpdec decoder. If you follow this guide you can end up with very nice results such as the one shown at the end.

Gqrx on Mac OS X (almost)

August 2, 2011 by Alexandru Csete

Few weeks ago, or maybe a month or two – I don’t remember, I spent an afternoon trying to build gnuradio-core and gr-audio on Mac OS X without using any macports. It was a casual an undocumented attempt that resulted in a compilation failure. I wasn’t surprised because I made several mistakes along the way, so I just left it an moved on.

AO-27 orbit 93036 received with Gqrx and Funcube Dongle

August 22, 2016August 1, 2011 by Alexandru Csete

FM traffic and packet radio from the AO-27 amateur radio satellite. I made this recording last Saturday while testing the Gqrx software receiver using the cross yagis at OZ7SAT and the Funcube Dongle.

Gqrx SDR receiver

August 22, 2016July 30, 2011 by Alexandru Csete

Please visit the new Gqrx website. The information on this page is no longer updated!

Gqrx is a software defined radio receiver for Funcube Dongle (FCD), RTL2832U-based DVB-T devices (RTL-SDR), Universal Software Radio Peripherals (USRP) and Osmo SDR devices. It is powered by GNU Radio and the Qt GUI toolkit.

First on the air tests of gqrx

August 22, 2016June 18, 2011 by Alexandru Csete

With both the frequency controller and FFT plot widgets in place gqrx was ready for the first on the air tests. The video below shows the first reception of the AO-27 amateur radio satellite during orbit 92436 and 92437, using the Funcube Dongle receiver that I use for portable space communication.

FFT plot and waterfall for gqrx

August 22, 2016June 18, 2011 by Alexandru Csete

Following my success with integrating the frequency control widget from cutesdr into gqrx I have decided to try the same with the FFT plot and waterfall widget. This too seemed to be a single C++ class that might be easy to integrate into my experimental software receiver powered by GNU Radio and Qt GUI.