TA1EEI/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. Then, extend your radio's antenna toward the monitor's HDMI port, and congratulations—you can now transmit in Morse code directly from your monitor!

5 best points · 0 comments · 1 Hacker News post · 55 GitHub stars · View on GitHub

From the README

📡 VHF Monitor RF Transmitter (TEMPEST / EMI Side-Channel Morse Generator) Author: TA1EEI (Efe Işık) Version: 1.3 License: MIT (Open Source / Educational & Experimental) 📰 Featured In & Media Coverage * [UK NCSC (National Cyber Security Centre)] – Included in the CTO Weekly Summary (September 2026) highlighting browser-driven physical side-channel emissions and display RF leakage. * [Hackaday] – *Get Your Monitor Transmitting VHF With A Browser Tool* – Covered as a zero-dependency hardware hack turning standard monitors into unintentional RF transmitters.

Hacker News discussions

• Show HN: Browser-Based Tempest – Transmitting VHF Morse via Monitor EMI Leakage (5 points, 0 comments, by TA1EEI, 2026-09-07)

More from TA1EEI on Hacker News

• TA1EEI/ClassD-VHF-Transmitter (1 points): Show HN: ClassD-VHF-Transmitter – Covert RF Transmission via Phone Speaker PWM