Ham Radio Digital Modes: How Your Radio’s Audio Gets Into the Computer

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Published on September 1, 2025 1:04:09 PM ● Video Link: https://www.youtube.com/watch?v=N8jtsNKiXco

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This is the second video in my series on the TOADs DI USB Digital Interface. In the last episode, we looked at how the PTT circuit works. Today we’ll break down the Audio In circuit — the simple path that takes the sounds from your radio’s speaker and safely delivers them into your computer’s microphone input via USB-C.

Whether you’re running FT8, Winlink, APRS, Packet, or AllStar, this circuit is the reason your computer can decode signals and turn them into text, messages, and contacts. We’ll explain it step by step in plain English, so even if you’re new to electronics, you’ll walk away knowing exactly how it works.

👉 TOADs DI board: https://www.temporarilyoffline.com/
👉 TOADs DB6 Board: https://www.temporarilyoffline.com/
👉 Documentation: https://geni.us/toads-di
👉 VK/ZL Orders: https://hamradiodx.net/
👉 Treedix RJ-45 Breakout Board: https://geni.us/rjCLNC
👉 10k Ohm Resistor: https://geni.us/JOHso
👉 BC547 Transistor: https://geni.us/SALAj
👉 Breadboard: https://geni.us/ruOylg
👉 Dupont Wires: https://geni.us/Hs41kGJ
👉 PCB Prototype Boards: https://geni.us/6ovrxgI
👉 Standard Double Row Pin Headers: https://geni.us/R7Ecka

Works with ANY radio and YOUR imagination!
👉 Winlink
👉 Allstar
👉 APRS
👉 FT8
👉 JS8Call
👉 Packet Radio

📌 Watch the full series where we cover:
• COS (Carrier Operated Squelch)
• Audio In (today’s video)
• Audio Out
• PTT

👋 Subscribe so you don’t miss the rest of the series!

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