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This page has been moved to the wiki here.

Please use the wiki, as this information here is out of date.

In the old days, COR was an acronym for "Carrier Operated Relay" as there were radio receivers which literally had relays in them just for this purpose. Most radio receivers now use a solid state switch to serve this purpose. The purpose of the COR signal is to change state when there is a signal being received by the receiver.

Other names synonymous with this signal are "Carrier Detect" and "Carrier Operated Switch" (COS).