Mike I believe this is precisely what I have been suggesting from my first post. It is not the CW keyer per say rather the need to turn on the transmitter X ms prior to the first CW character reaches the Transmitter input port (Lead-In Timing) and on the Exit the (Tail Timer) time Y ms after the last CW character prior to shutting off the transmitter and another short time Z ms to create a signal to turn on the receiver.
This technology really goes back a ways in history as the "collective we" have forgotten how spoiled we (collective we) have become with the advent of transistorized radios. Now in the Age of the computer or "Software Defined Radio" all perviously insignificant timing events now have to be coded into the operational software. The physical amount of time may be very short but remember in the Computer Driven World even the smallest amount of dead air time has to be part of the Operational Software Code.
VE6LX