PAL-Streamer

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

Analog TV PAL CH3 transmitter

Documentations

Visit my Hackaday project for explanation how it works

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

STM32 Firmware

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.

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

• 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