# Vhf Morse Transmitter Monitor

> Set your radio to 148.500 MHz, select FM, USB, or CW mode, and set the squelch to 0 or 1.

- **Website:** https://github.com/TA1EEI/vhf-morse-transmitter-monitor
- **Pricing:** open source
- **Categories:** Research, Developer Tools
- **Tags:** research, developer-tools, infrastructure
- **Platforms:** Web
- **Last verified:** 2026-09-10
- **Canonical page:** https://linkrena.com/tools/vhf-morse-transmitter-monitor

## About

The VHF Monitor RF Transmitter is a browser-based experimental tool that converts an ordinary computer display into a short-range VHF Morse code transmitter .

Modern video pipelines are not purely optical; they are high-speed digital electronics operating at high frequencies. This project exploits Unintentional Electromagnetic Radiation (EMI) to broadcast readable RF signals.

When the screen displays a plain black or static background, the signal current across the video cable remains relatively uniform.

However, when the application renders an alternating $1 \times 1$ pixel pattern (alternating black #000000 and white #FFFFFF pixels side by side), every adjacent clock cycle forces the display interface serializer (TMDS or FRL in HDMI; Main Link Lanes in DisplayPort) to toggle its voltage state rapidly.

This maximum state toggling induces a strong electromagnetic field at the exact pixel clock frequency ( 148.500 MHz ), broadcasting an RF carrier wave into space.

Carrier ON (Mark): The application renders a high-contrast alternating pixel pattern across the entire screen canvas. The video line serializer fluctuates at maximum capacity, emitting strong RF interference.

Carrier OFF (Space): The canvas switches instantly to solid black ( #000000 ). Clock transitions drop to minimal baseline noise, collapsing the radiated RF output.

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