Yes, you can use multiple keying sources with the Corsair II, but not
without building a cable.
The key input actually keys the radio. The using the internal keyer that
input is jumpered to the internal keyer out. Though if a QSK linear is
connected, then the Keyer output goes to the linear first, then the
linear keys the radio.
So to use contest software or straight key and internal keyer, the
keyer, key and PC (all "open collector") would be connected in parallel,
then to the QSK linear which keys the radio when the relays have
switched. Or to the Key input on the Corsair II.
73, Jerry, K0CQ
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