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

Analog TV PAL CH3 transmitter

Visit my Hackaday project for explanation how it works

• https://hackaday.io/project/171977-pal-streamer

Pinout for STM32F411 Nucleo Board.

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

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

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

Standard: PAL-B/G

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

Connector: Aerial connector

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

• http://www.kolumbus.fi/pami1/video/pal_ntsc.html
• http://martin.hinner.info/vga/pal.html
• http://martin.hinner.info/vga/
• http://www.batsocks.co.uk/readme/video_timing.htm
• https://www.mups.co.uk/post/2017/07/non-interlaced-pal-video/
• https://www.rigacci.org/docs/biblio/online/pal_video/
• http://wiki.americanarchive.org/index.php/Breakdown_of_Analog_Broadcast_Standards
• https://forum.videohelp.com/threads/393870-Help-me-to-understand-the-NTSC-signal-fields