If you’ve been on the RTL-SDR forums lately, you may have noticed that a lot of work is being done on the DragonOS software. This is a software-defined radio group that has seen a lot of effort for a specially built Debian-based distribution of Linux that can do a lot of SDR. The latest and most exciting project coming from them includes a method for use software to receive and demodulate analog video.
[Aaron]The video (linked below) demonstrates the use of certain software called SigDigger for analysis of incoming analog video stream from a drone using HackRF. (Of course, any input analog signal can be used, it doesn’t have to be a drone.) The software shows the different active frequency bands, allows the user to narrow down to one and then start demodulating it. Although you have to dial exactly to get everything that doesn’t look like snow, [Aaron] is able to get recognizable results in just a few minutes.
Making something like this work completely in the software is an impressive feat, especially considering that all the software used here is free. Of course, this would not be as easy for a digital signal as most TV stations, but there is still a lot of entertainment. In case you missed the release of DragonOS, we covered it a few weeks ago and has since improved only with this project just as an example.
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