...Does the K3 require the use of a null modem cable?
No, a standard, straight-through, pin-for-pin, male-to-female, 9-pin
serial cable is all that is required.
Will one made to K2 specs be OK, or are other RS-232 signals required
to be connected?
The 3-wire cable for the K2 will work for getting data into and out from
the K3. If you wish to use RTS or DTR for PTT and/or keying, then these
lines must be connected.
73,
Lyle KK7P
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