[Elecraft] K3: RS-232 cable

[Julian G4ILO]

The manual says: "Do not use a cable wired for use with an Elecraft K2
or K2/100 transceiver or accessories. They may be wired differently."

As far as I remember, the K2 serial cable was just a standard 3 wire
cable, to which I added a transistor switch driven by DTR or RTS
(can't remember which) for CW keying. Even with this addition, I can't
see why I couldn't use it with the K3. What is the point that I am
missing?
-- 
Julian, G4ILO K2 s/n: 392  K3 s/n: ???
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