VE3KI's explanation is absolutely correct, but I would add a CAUTION that once
you have this arrangement set up, be careful to boot your computer and N1MM
BEFORE turning on your K3 or at least before enabling transmit. This is
because some of the start-up "processes" seem to key the radio when you
wouldn't want it to be keyed. I'm using a USB-to-Serial converter and that may
makes things worse (or better?).
73, Barry, K6RM
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