I have an old version of CT6 and am trying to interface it with my FT990. I
have built the interface described in the manual for an LPT port. However,
when I insert the plug I am keying the radio. I have checked the circuit for
shorts an all is OK. Am I missing something? Should the common lug be
connected to the common pin on the LPT port? If so, which pin is common?
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