Hello Dave,
It's normal, what you hear ! The direct connection to the d-sub connector is not recomended as it can damage either the computer or the transceiver. You will have to build the interface shown in the N3FJP software, either with transistors or with optical coupling ( prefered, no groud loop!). The result should be very nice with either interface. GL Dave! 73 from F5UL/Bob

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