Jeff,
The K3's I/O module already provides for the use of RTS or DTR for PTT
and/or CW KEY in (two separate control lines). The exception is FSK,
which is on the ACC connector. In the present incarnation, driving this
line from a PC requires two external parts (one garden-variety NPN
transistor and one resistor). I used MMTTY with this interface during
NAQP this weekend.
But one nice thing about the K3 is its modularity. Both the main I/O
card and its audio and digital daughter boards can be easily changed to
meet future needs. If for example we added an FSK interface to the
digital daughter board, you'd be able to upgrade it very inexpensively,
and installing it would take about 2 minutes.
Also, we plan to design an external general-purpose I/O unit that would
connect to the ACC jack. It would provide pre-wired connectors for use
with various PC interfaces, transverters, the KRC2, etc.
73,
Wayne
N6KR
---
http://www.elecraft.com
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