1-C-13: VHF Equipment Controls
1-13C1:
What is the purpose of the INT-USA control settings on a VHF?
To change certain International Duplex channel assignments to simplex in the U.S. for VTS and other purposes.
To change all VTS frequencies to Duplex so all vessels can receive maneuvering orders.
To change all VHF channels from Duplex to Simplex while in U.S. waters.
To change to NOAA weather channels and receive weather broadcasts while in the U.S.
1-13C2:
VHF ship station transmitters must have the capability of reducing carrier power to:
1 watt.
10 watts.
25 watts.
50 watts.
1-13C3:
The Dual Watch (DW) function is used to:
Listen on any selected channel while periodically monitoring Ch-16.
Listen to Ch-70 at the same time while monitoring Ch-16.
Sequentially monitor 4 different channels.
Sequentially monitoring all VHF channels.
1-13C4:
Which of the following statements best describes the correct setting for manual adjustment of the squelch control?
Adjust squelch control to the minimum level necessary to barely suppress any background noise.
Always adjust squelch control to its maximum level.
Always adjust squelch control to its minimum level.
Adjust squelch control to approximately twice the minimum level necessary to barely suppress any background noise.
1-13C5:
The “Scan” function is used to:
Sequentially scan all or selected channels.
Monitor Ch-16 continuously and switching to either Ch-70 or Ch-13 every 5 seconds.
Scan Ch-16 for Distress calls.
Scan Ch-70 for Distress alerts.
1-13C6:
Why must all VHF Distress, Urgency and Safety communications (as well as VTS traffic calls) be performed in Simplex operating mode?
To ensure that vessels not directly participating in the communications can hear both sides of the radio exchange.
To minimize interference from vessels engaged in routine communications.
To enable an RCC or Coast station to only hear communications from the vessel actually in distress.
To allow an RCC or Coast station to determine which transmissions are from other vessels and which transmissions are from the vessel actually in distress.
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Color key:
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● = Unseen
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● = Weak
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● = Review
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● = Learned
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● = Incorrect answer
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