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对于3.5mm的连接线可以参考这个：
Many HF transceivers use a stereo jack for the internal electronic keyer. Some have a 1/4″ jack, others have a 3.5mm jack. This is a note on how most of these are wired to a CW paddle.
On a TRS cable (tip ring sleeve 3.5mm)
Red: tip (left, dit)
White: ring (right, dah)
Yellow: sleeve (common ground) (this wire could also be black)
If you’re right-handed, use the left paddle for the dit, which would go to the tip of the plug which would be the red connection. The white connection is the dah (right paddle) which goes to “ring” on the plug, adjacent to the tip. The common ground would go on the base “sleeve” connection on the plug, the yellow wire.
也就是对于3节的3.5mm连接线，顶部是“滴”，第二节是“嗒”，最下面一节公共地。可以按照左右手习惯调整
来源：https://ad6dm.net/log/2018/02/wiring-a-cw-paddle/
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