BD4TZY Having seen that many people in the industry are making PCB call signs, as an experienced electronics engineer, I couldn't miss out on this. Inspired by my colleagues, I created three different models: a light-based call sign board, a radio frequency detection board 1, and a radio frequency detection board 2. These boards can be used with two-way radios to indicate the location of the antenna via a call sign, and pressing a button will turn on an LED to indicate whether there is any transmission power. It's a lot of fun!
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