Raspberry Pi Broadcasts UHF Channels to CRT TVs

It’s not quite the same as running your own TV station and broadcasting episodes of Conan the Librarian to everyone in town, but this Raspberry Pi project is the next best thing. If you’ve got an old CRT TV lying around, you could be transmitting video to it over UHF using Redditor Devicemodder2’s CRT TV project. It’s built with a Raspberry Pi Zero and enables compatible CRT TVs within range to tune in to a predetermined channel for wireless video streaming.

The system relies on a Micro UHF Analog TV transmitter chip that’s available on Ali Express for $15. This transmitter is connected to the composite video output on the back of the Pi Zero. 

(Image credit: devicemodder2 on Reddit)

In the image above, the yellow wire is signal, the orange is 5V power and the blue is ground. If you haven’t used a Pi Zero for composite video output before, check out this article from MagPi, the official Raspberry Pi magazine, for a detailed look at how it works on Raspberry Pi Zero. 

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(Image credit: Devicemodder2)
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(Image credit: Devicemodder2)

According to Devicemodder2, RF-only TV sets within 100 feet can tune into the Raspberry Pi video feed. In this setup, the system transmits video output on channel 29. Devicemodder2 also clarified that the transmitter used in this project is configured only for PAL audio but the signal fed through it is NTSC. As such, there is no audio output, only a video feed.

Devicemodder2 created this project for the purpose of testing old CRT TVs they might want to buy from thrift stores or local sellers on Craig’s List. With a UPS Lite V1.2 UPS Power HAT with battery and the transmitter both attached to the Pi Zero, they are able to make sure any TV is in working order, without plugging the Pi into either power or the television itself. 

The developer also told us that they use the Pi Zero to show still photo galleries on their CRT TVs over UHF. We’re not sure what kind of frame rates you’d get for video playback or gaming.

Check out the original thread shared to Reddit for a closer look at this clever Raspberry Pi CRT TV broadcaster and tester.

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