On 5-23-2011 21:08, Dave M wrote:



COR = Carrier Operated Relay
A signal used in a repeater to indicate that a carrier is being received.
Used to be a common signal in old tube-type equipment, where the receiver
and transmitters were controlled by relays. Modern solid-state equipment
doesn't have a COR signal... it's usually a logic-level signal from the
squelch circuit that indicates that the receiver has detected a carrier.


Correct. Looking at a TS-2000 manual on line (I do not own a TS-2000),
I would say the signal you want is on the ACC2 port on the rear of the
radio and called MSQ. This pin goes to ground when the squelch is
opened and/or receiving a signal. It is an "open" when the audio is
squelched. If your Echolink interface is looking for a "ground" signal
to indicate the presence of RX audio, this pin should work as is. If
your interface needs a positive voltage during RX, then you would need
an NPN transistor used as an inverter.


N0EDV