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If you don't plan to operate CW with your uBITZ, you can skip wiring up the jack for a key by connecting the blue and green wires with a 4.7k Ohms resistor as pictured.

Unlike the picture, you should protect those connections with shrink wrap or electrical tape to prevent shorting inside your unit which can cause CW TX to turn on. Ideally you would protect the solders and leave the resistor exposed for inspection.

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