I see in the ALC mod rework that there is an optional modification for a true TTL output on band data. I assume that the negative-going ALC input will be the Elecraft shipped standard, so I'll modifiy my K3 (SN308) for this. Since most external devices require a band-data TTL output (as opposed to open drain/collector), I wonder what the official Elecraft band-data output will be from now on. I think it should be true TTL. However, if it isn't I'll continue to do this externally. If a true TTL output will become the shipped K3 standard, then I'll modify my K3 for this.
Phil - AD5X
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