Broadcast FM reception with Gqrx and Funcube Dongle

Here is a short demo showing how to receive broadcast FM with Gqrx. This demo uses the Funcube Dongle, which is really not suited for broadcast FM reception. Gqrx does not employ any tricks to make it sound like it works properly – it just does straightforward FM demodulation with wide FM parameters and you will hear the lack of sufficient bandwidth as distortion on some stations (not all though).

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Daily Gpredict builds for Ubuntu

Daily Gpredict builds for UbuntuThanks to Jan Simon, DL2ZXA, we now have daily builds of Gpredict for Ubuntu 10.04 – 12.04, both 32 and 64 bit. Jan’s recipe fetches the code imported from SourceForge, merges it with the translations done in the Launchpad, then builds the packages and puts them in the Gpredict teams Daily builds PPA. You can use this PPA as you would use any other PPA; if you don’t know how check out the instructions on the PPA page. Obviously, this is only recommended for testing and not for production use.

Unity, Gnome 3 and my way out of this madness

I will remember 2011 as the year when the Linux desktop took a huge step backwards. After decades of evolution we finally had a nice Gnome 2 based desktop providing a clean and efficient environment where one could focus on getting the work done. Even the Ubuntu variant with their this-makes-me-wanna-puke-brown and purple theme was okay, because it took only a few mouse clicks to switch back to something more pleasant looking, e.g. the Clearlooks theme. All this is gone now as the majority of Linux desktops come with either Gnome 3 or Unity – two equally useless and pathetic attempts at making the Linux desktop look like a cellphone.

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Gumstix Overo Water + eCAM32 camera demo

3.2 mega pixel cameraAs promised in my last post, here is a quick demo of the eCAM32 3.2 megapixel camera connected to the Gumstix Overo Water. I am presenting two videos, one showing the setup where the eCAM32 camera board is mounted on top of the Gumstix Overo Water, the other one being a screen cast demonstrating some of the most common settings of the camera. I am using the Tobi expansion board because it has Ethernet interface allowing me to stream H.264 encoded video to a host PC running linux.

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The e-CAM32 and e-CAM50 cameras

As I mentioned in my previous post, I had only had limited success with the Caspa VL and Logitech UVC cameras. While both cameras work with the Gumstix, the Caspa seems to take poor images while the Logitech USB camera performance is limited by low USB bandwidth. Therefore, I have decided to try my luck with cameras from e-Con Systems.

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Qthid 3.1 with Mac OS X Lion support

The Qthid Funcube Dongle controller version 3.1 has now been released. This release includes the necessary fixes to make qthid work on Mac OS X 10.7 Lion. Thanks to Mike KØZAP for the patch!

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AO-27 orbit 93036 received with Gqrx and Funcube Dongle

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.

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Gqrx SDR receiver


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.

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Qtmm souncard modem decoding APRS data from the ISS

Yesterday I successfully received APRS transmissions from the International Space Station on 145.825 MHz using my Yaesu FT-817 connected to my MacBook Pro via a Signalink audio interface and a USB sound adapter.

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