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Though it looks like it will work based on the signal level requirements, it would be wise to get a scrap of copper clad board and wire up an optocoupler ugly style for your PTT output.? That will protect the circuitry inside the QCX should any mishaps occur with the PTT cable and if you use a jack that is isolated from the chassis it also prevents a ground loop from forming between the amp and exciter when both cables are connected.