It has an open drain to ground for activating the Tx key line on an
external amplifier. This is in the form of a 2.5mm diameter TRS
connector. It may be used byt the 100 watt amplifier for the K3, so you
might have to be a bit clever in applying it to your PW1...
73,
Lyle KK7P
Does the KX3 has a TR out to key my ICOM PW1 Amplifier?
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