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Transmit a video stream to a PAL analog TV using low-frequency PWM

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PAL-Streamer

Transmit a video stream to a PAL analog TV using low-frequency PWM

Analog TV PAL CH3 transmitter

./Images/img1.png

Documentations

Visit my Hackaday project for explanation how it works

STM32 Firmware

Pinout for STM32F411 Nucleo Board.

PA12 (CN10_12) to USB DP
PA11 (CN10_14) to USB DM
PA10 (D2) to antenna

./Images/pinout.jpg

Add path to the STM32CubeMX HAL drivers and Compile with STM32CubeIDE.

PC Software

Connect board to the PC using USB CDC Virtual COM Port.

Run Python 3 program.

python3 usart_new.py <COM_PORT> <IMAGE_FILE> <GIF_DELAY>
python3 usart_new.py COM2 example.png
python3 usart_new.py /dev/tty.usb* example.png

TV Specs

Standard: PAL-B/G

Frequency: VHF CH 2-12, UHF CH 21-69

Connector: Aerial connector

Video carrier frequency

VHF LOW

  • CH2 = 55.25 MHz
  • CH3 = 61.25 MHz
  • CH4 = 67.25 MHz
  • CH5 = 77.25 MHz
  • CH6 = 83.25 MHz

VHF HIGH

  • CH7 = 175.25 MHz
  • ...
  • CH12 = 205.25 MHz
  • CH13 = 211.25 MHz

PAL/NTSC Timing Specification

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Transmit a video stream to a PAL analog TV using low-frequency PWM

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