This read-write object controls the transmit carrier state: off(0), on(1), or RTI/Receive-Transmit-Inhibit(2), with values 3-5 reserved as read-only status indicators for external control, BUC warm-up delay, or STDMA burst states. This is the master on/off switch for the modem's actual RF transmission, distinct from all the frequency/power/modulation configuration objects -- a technician can have every Tx parameter configured correctly yet the unit transmits nothing at all if this remains at off(0), which is also the deliberate safety state used during installation and antenna alignment to avoid illuminating the satellite with a misaligned carrier. During antenna installation, a technician would leave this object at off(0) while pointing the dish, only setting it to on(1) once pointing, power, and frequency are all verified correct, to avoid transmitting an unintended signal toward the satellite during alignment.