https://community.allstarlink.org/t/creating-a-requested-feature-list/22699/8?u=n8ei
Echolink on a Simplex Node will not send a broadcast (Example Echolink Node 826983, the ARRL Newsline) until the a radio first keys into the node - When a scheduled connection is made, the node just sits there - connected, but not sending until a user keys their mic.