Itís been a few years since the RTL-SDR TV Tuner dongle blew up the world of amateur radio; itís a simple device that listens in on digital television frequencies, but itís one of those tools thatís just capable enough to have a lot of fun. Now, we have a transmitting dongle. Itís only being used to transmit live HDTV from a Pi, but that in itself is very interesting and opens up a lot of possible builds.
The key piece of hardware for this build is a UT-100C DVB-T modulator. Itís a $169 USB dongle capable of transmitting between 1200-1350 MHz, and with a special edition of OpenCaster itís possible to transmit over-the-air TV. Thereís no amplifier, so you wonít be sending TV very far, but it does work.
On the Raspberry Pi side of the build, the standard camera captures H.264 video with raspivid, which is converted to a DVB compliant stream using ffmpeg. These are well-worn bits of software in the Raspberry Pi world, and OpenCaster takes care of the rest.
While this seems like the perfect solution to completely overbuilt quadcopters, keep in mind transmitting on the 23cm band does require a license. Transmitting in the UHF TV bands is a bad idea.
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