GMDSS. FCC Test 49 – Online Maritime Tests

The purpose of ITU channel spacing is:

To make most efficient use of the radio spectrum by using telex channels rather than voice channels.
To minimize the possibility of interference from adjacent channels.
To make most efficient use of the radio spectrum by using voice channels rather than telex channels.
To maximize the number of voice & telex channels available.

ITU channels are:

Which statement regarding channel spacing and bandwidth is true?

Both telex bandwidth and channel spacing values are greater than voice bandwidth and channel spacing values.
Telex bandwidth is greater than voice bandwidth and therefore telex channel spacing values are less than voice channel spacing values.
Both telex bandwidth and channel spacing values are less than voice bandwidth and channel spacing values.
Voice bandwidth is greater than telex bandwidth and therefore Voice channel spacing values are less than telex channel spacing values.

The proper sequence of channel spacing from narrow to widest is:

Which statement regarding bandwidth and channel spacing is correct:

What is meant by the term 'ITU channel'?

This refers to a vessel's selcall number.
None of the above.
This refers to VHF channels 1-28 and 60-88.
This refers to an internationally standardized assignment of frequency pairings for common use.

Which of the following defines 'ITU Channel 1216'?

Ch-16 in the 12 MHz band.
This would indicate the 16th channel in the 12 MHz band, but Ch-1216 does not yet exist as there are currently only 15 possible channels.
Ch-12 in the 16 MHz band.
Ch-1216 in the MF band.

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