The proper sequence of channel spacing from narrow to widest is:
β’ Relative bandwidth of different marine communication modes: SITOR (NBDP) vs SSB voice vs VHF-FM voice β’ How narrowband digital modes compare in channel spacing to analog voice modes β’ Regulatory tendency: higher frequency / more modern VHF services often use wider channel spacing than older HF digital services
β’ First, rank these three services by how much information (voice vs text) they typically carry at one time. Which one likely needs the least bandwidth? Which needs the most? β’ Think about which system is designed for narrow, efficient text transmission and which are designed for clear voice communication over varying ranges. β’ Consider which service (HF SSB vs VHF-FM) is usually associated with busy coastal channels and therefore tends to use wider channel spacing to separate many simultaneous users.
β’ Be clear on what SITOR (NBDP) actually sends (text/data vs voice) and why that affects channel spacing. β’ Compare HF SSB voice and VHF-FM voice: which tends to have the largest channel spacing in common marine use? β’ Before choosing, line up each option from left to right as narrow β medium β wide and check if that ranking matches your understanding of each modeβs bandwidth needs.
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