9D23 A
 The properly operating VHF DSC transmitter in the GMDSS system differs from older non-GMDSS VHF voice transmitters in what way?
A. Required carrier stability.
B. Frequency response is flat rather than 6dB/Octave pre-emphasis.
C. Direct FM is used rather than PM.
D. 800 Hz deviation is used rather than 5 kHz.
