I see folks using the US Interface box along with HRD. What are the
advantages of using Navigator with HRD over just using HRD alone?
The Navigator is a USB-to-rig interface box (hardware); HRD is control
and digital mode software.
The computer running HRD has to connect to the radio somehow.
For a K3, you only need a serial cable and two audio cables, assuming
your computer has a "sound card." Most (but not all) of what an
interface such as the Navigator provides is built in to the K3.
Specifically, the Navigator provides a USB interface to the computer,
and provides the sound card function as well as direct FSK and an
internal windows-friendly CW keyer. Other interfaces from microHAM,
RigExpert, MFJ, SignaLink and so forth provide varying degrees of this
sort of convenience.
For what it's worth, I just use a serial cable and two audio cables with
my K3.
73,
Lyle KK7P
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