Podcast
Questions and Answers
Which channel is used only for digital selective calling (DSC) on VHF frequencies?
Which channel is used only for digital selective calling (DSC) on VHF frequencies?
- Channel 16
- Channel 6
- Channel 22A
- Channel 70 (correct)
Which channel is utilized for the required bridge-to-bridge watch using non-DSC VHF-FM?
Which channel is utilized for the required bridge-to-bridge watch using non-DSC VHF-FM?
- Channel 13
- Channel 16 (correct)
- Vessel's working frequency
- Channel 70
Which channel would most likely be used for routine ship-to-ship voice traffic on VHF frequencies?
Which channel would most likely be used for routine ship-to-ship voice traffic on VHF frequencies?
- Channel 22A
- Channel 70
- Channel 08 (correct)
- Channel 16
What channel would you use to place a call to a shore telephone on VHF frequencies?
What channel would you use to place a call to a shore telephone on VHF frequencies?
Which mode allows receipt of vessel traffic lists from high seas shore stations on MF-HF frequencies?
Which mode allows receipt of vessel traffic lists from high seas shore stations on MF-HF frequencies?
Why must all MF-HF Distress, Urgency, and Safety communications take place only on the 6 assigned frequencies and simplex operating mode?
Why must all MF-HF Distress, Urgency, and Safety communications take place only on the 6 assigned frequencies and simplex operating mode?
In which sea areas is it always compulsory to maintain a watch on VHF Channel 16?
In which sea areas is it always compulsory to maintain a watch on VHF Channel 16?
What is the duration of a silent period to be observed at how many minutes past the hour when a watch is required on 2182 kHz?
What is the duration of a silent period to be observed at how many minutes past the hour when a watch is required on 2182 kHz?
Which statement is true regarding maintaining a watch on VHF Channel 16?
Which statement is true regarding maintaining a watch on VHF Channel 16?
What are the mandatory DSC watchkeeping bands/channels?
What are the mandatory DSC watchkeeping bands/channels?
When is a watch on VHF Channel 16 not required?
When is a watch on VHF Channel 16 not required?
Who is responsible for maintaining a watch on VHF Channel 16?
Who is responsible for maintaining a watch on VHF Channel 16?
What is the purpose of the 'Scan' function?
What is the purpose of the 'Scan' function?
Which channel must VHF-FM-equipped vessels monitor at all times when the vessel is at sea?
Which channel must VHF-FM-equipped vessels monitor at all times when the vessel is at sea?
Why must all VHF Distress, Urgency and Safety communications be performed in Simplex operating mode?
Why must all VHF Distress, Urgency and Safety communications be performed in Simplex operating mode?
What frequency and emission is used for aircraft distress communications?
What frequency and emission is used for aircraft distress communications?
What is the purpose of adjusting squelch control to approximately twice the minimum level necessary to barely suppress any background noise?
What is the purpose of adjusting squelch control to approximately twice the minimum level necessary to barely suppress any background noise?
When must VHF-FM-equipped vessels monitor Channel 16?
When must VHF-FM-equipped vessels monitor Channel 16?
Study Notes
VHF Radio Operations
- Adjust squelch control to approximately twice the minimum level necessary to barely suppress any background noise.
- The "Scan" function is used to monitor Ch-16 continuously, switch to either Ch-70 or Ch-13 every 5 seconds, scan Ch-16 for Distress calls, and scan Ch-70 for Distress alerts.
- All VHF Distress, Urgency, and Safety communications (as well as VTS traffic calls) must be performed in Simplex operating mode to ensure that vessels not directly participating in the communications can hear both sides of the radio exchange.
VHF Channel Selection
- VHF-FM-equipped vessels must monitor Ch-16 at all times when the vessel is at sea.
- The aircraft frequency and emission used for distress communications is 121.500 MHz - A3E.
- Ch-70 is used only for digital selective calling.
- VHF-FM on Ch-13 in most areas of the continental United States is used for the required bridge-to-bridge watch.
- Ch-08 is used for routine ship-to-ship voice traffic.
- Ch-28 is used to place a call to a shore telephone.
MF-HF Equipment Controls
- Modes that can be selected to receive vessel traffic lists from high seas shore stations are VHF-FM and SSB.
- All MF-HF Distress, Urgency, and Safety communications must take place solely on the 6 assigned frequencies and in the simplex operating mode to maximize the chances for other vessels to receive those communications.
Watchkeeping
- A 3-minute silent period must be observed at 00 and 30 minutes past the hour when a watch is required on 2182 kHz.
- A watch on VHF Ch-16 is compulsory at all times while at sea until further notice, unless the vessel is in a VTS system.
- The mandatory DSC watchkeeping bands/channels are 2 MHz MF DSC, 6 MHz DSC, VHF Ch-70, and 1 other HF DSC.
Logkeeping
- The licensed operator or a person whom they designate is required to make entries in a required service or maintenance log.
- The station licensee is responsible for the proper maintenance of station logs.
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Description
Test your knowledge on VHF communication procedures and terminology. Questions cover topics such as adjusting squelch controls, using scan functions, and operating in Simplex mode for distress calls.