Turn your Raspberry Pi into a live HDTV transmitter

Please note that the information in this article is out of date and needs updating. I will do my best to update it soon.

In a previous post I wrote about using the UT-100C DVB-T modulator on linux and I promised to follow up how to use the modulator with live video sources. In this post I am going to describe how to setup the modulator on a Raspiberry Pi equipped with a RaspiCam camera module, effectively turning the Pi into a live HDTV transmitter.

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New Final for the K1

I have now waited more than two weeks for the 2SC1969 that I have ordered from El Supply. Since the Easter holidays are coming closer and closer and I want to have the K1 with me, I looked for another source. I found Brinck Elektronik who has a shop in Copenhagen city. I was lucky enough to get the last piece they had on stock. They can still order it for me later but it will cost twice as much.

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K1 TX Signal Tracing

Yesterday I have done the transmitter signal tracing using my Velleman PCS500 pc-based oscilloscope. Here are the results: PRE (0.04-0.09) 0.025 V ATTN (0.02-0.05) 0.047 V OSC (0.01-0.04) 0.019 V MIX (0.1-0.2) 0.042 V BUF (1.5-2.0) 1.74 V TR1 (0.5-1.0) 0.66 V BPF (0.5-1.0) 0.78 V TR2 (0.5-1.0) 0.72 V TR3 (<0.01) 1.5 mV DRV … Read more

K1 Noise Blanker and Blown Final?

I finished the KNB1 noise blanker today and installed it in the K1. When finished, I connected the K1 to my ATX-1080 set to the 40 meter band. I put the OHR WM-2 wattmeter and the T1 antenna tuner in between the K1 and the antenna. First I tried to put the T1 into bypass mode, but I wasn’t quite sure whether the yellow LED meant bypass on or tuner on… Later I found out that green led means tuner on, yellow led means bypass on.

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K1 Transmitter Alignments

I was just about to panic when I first set the K1 into TUNE mode. I have hooked up the K1 to my variable power supply, set the current limiter to 1 amps (as instructed by the manual), turned the K1 on and set it into TUNE mode. The only thing that happened was that the K1 turned off and the current limitin led on my power supply was lighting up, meaning that the K1 wanted more current then it was given.

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