When, other than during an emergency, may a Technician class licensee be the control operator of a station operating in an Amateur Extra Class band segment?
At no time✓Bonne réponse
When designated as the control operator by an Amateur Extra Class licensee
As part of a multi-operator contest team
When using a club station whose trustee holds an Amateur Extra Class license
Explication
Frequency privileges are set by the control operator's own license class, and no arrangement transfers Amateur Extra privileges to a Technician. Being designated by an Extra licensee, joining a contest team or using a club station does not enlarge your own privileges.