What is the most common method of generating a SITOR (NBDP) signal on shipboard GMDSS equipment?
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Correct Answer
Two alternating sidebands of 1615 Hz and 1785 Hz are offset from the carrier frequency by 1700 Hz.
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The carrier frequency is alternately shifted from + 85 Hz to - 85 Hz while suppressing the sidebands.
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There is one 1500 Hz sideband which is shifted from +170 Hz to - 170 Hz with a suppressed carrier.
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Two alternating sidebands of 1500 Hz and 2300 Hz are offset from the carrier frequency by 1900 Hz.