9D39 C
 In checking the demodulator for a MF/HF DSC receiving system:
A. The RF generator must be tuned 1.7 kHz below carrier.
B. It must recognize the ships assigned tones.
C. It must recognize audio of 1615 and 1785 Hz.
D. It must recognize audio of 800 Hz and 1700 Hz within 10 Hz.
