叠甲: There are already open-source boards available internationally that are very well developed and can be used directly by experienced individuals. AIOC_EasyEDA
Currently, many amateur radio enthusiasts use VOX to trigger SSTV and data transmission.
The VOX system is unstable. A significant issue is the high latency when disabling PTT, which makes it unsuitable for data patterns that require receiving ACKs.
Therefore, I designed a simple circuit board with audio + serial port PTT control.
Video introduction
Demonstration usage
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