9-18B1 D
 Which of the following conditions indicate the proper operation of a 150 Watt MF/HF transmitter in the F1B ARQ mode?
A. The RF power meter indicates constant output at a level between 125 watts and 150 watts during transmission.
B. The RF power meter indicates power output only when characters are typed on the NBDP keyboard.
C. The RF "S" meter indicates a signal level between 125 watts and 150 watts during NBDP reception.  
D. The RF power meter indicates an output that fluctuates between 0 and 150 watts during transmission.
