A simple way to get video in and out of GNU Radio

One of the things I want to do with GNU Radio and the USRP is video transmissions over radio. For this purpose I need a way to read video sources – including files, webcams and other video capture devices – and to display or save it on the other end.

I suppose the right way to do this is to create specific signal sources and sinks for GNU Radio. This can be done either by “direct access”, i.e. read the UVC device directly, or by using a higher level library like libvlc or the ffmpeg libraries (libav*). The latter has indeed been used for audio and the code is available from the Comprehensive GNU Radio Archive (CGRAN) under Mediatools.

For this experiment, however, I decided to try something simpler that that I can try and conclude within an evening: Use VLC as capture  and playback applications and connect to GNU Radio using either the TCP or UDP interfaces.

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Successful first tests of the UNITEC-1 receiver setup

Today we carried out the first test campaign of the 5.6-5.9 GHz receiver setup consisting of the KU LNC 5659 C PRO low noise down-converter, USRP with WBX daughterboard and some GNU Radio software. Our plan was to test the receiver using the 5.76093 GHz signal from the OZ7IGY beacon. The results are as follows: … Read more

OZ7IGY beacon with GNU Radio, USRP and WBX

I was playing with GNU Radio, the USRP and the WBX daughterboard tonight preparing for the tests of the 5.7/5.8 GHz receiver setup tomorrow. For some reason that I can not remember, I have decided to tune in to 432.471 MHz – the UHF frequency of the OZ7IGY beacon, which is located approximately 50 km … Read more

Simple CW Receiver with GNU Radio

I have been playing with GNU Radio and GRC (GNU Radio Companion) over the weekend and I ended up implementing a very simple CW receiver. This will be very handy on Tuesday when we will be testing the 5.8 GHz UNITEC-1 setup for the first time using the OZ7IGY beacon on 5.76093 GHz. Here is a quick video demo of the receiver where I use my Yaesu FT-817ND to transmit a test signal.

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Technical papers about UNITEC-1

I did a Google search to find some technical information about UNITEC-1 – in addition to what is already available on their website – and here is what came up: Structural Design of UNITEC-1 (944k PDF) UNITEC-1 and Onboard Computer Survival Competition in Interplanetary Environment (867k PDF) Preliminary Thermal Design of UNITEC-1 (1.0M PDF) They … Read more

UNITEC-1: The KU LNC 5659 C PRO has arrived

Yesterday I have received the C-band down-converter that I have ordered last week for the UNITEC-1 receiver station. Watch video on YouTube. I have also uploaded a few high resolution photos to my Picasa Albums: If you can’t read the specs, you can see them on my work-in-progress wiki page about the C-band Receiver Station. … Read more