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Subel. A
6 questions
Subelement A
Rules & Regulations
Section 1
Equipment Requirements
What is a requirement of all marine transmitting apparatus used aboard United States vessels?
  • Correct Answer
    Only equipment that has been certified by the FCC for Part 80 operations is authorized.
  • Equipment must be type-accepted by the U.S. Coast Guard for maritime mobile use.
  • Certification is required by the International Maritime Organization (IMO).
  • Programming of all maritime channels must be performed by a licensed Marine Radio Operator.
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What transmitting equipment is authorized for use by a station in the maritime services?
  • Transmitters that have been certified by the manufacturer for maritime use.
  • Correct Answer
    Unless specifically excepted, only transmitters certified by the Federal Communications Commission for Part 80 operations.
  • Equipment that has been inspected and approved by the U.S. Coast Guard.
  • Transceivers and transmitters that meet all ITU specifications for use in maritime mobile service.
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Small passenger vessels that sail 20 to 150 nautical miles from the nearest land must have what additional equipment?
  • Inmarsat-B terminal.
  • Inmarsat-C terminal.
  • Aircraft Transceiver with 121.5 MHz.
  • Correct Answer
    MF-HF SSB Transceiver.
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What equipment is programmed to initiate transmission of distress alerts and calls to individual stations?
  • NAVTEX.
  • GPS.
  • Correct Answer
    DSC controller.
  • Scanning Watch Receiver.

DSC (Digital Selective Calling) controller is the correct answer.

NAVTEX is teletype-style mode of broadcasting marine safety information, GPS is a satellite receiver, and a Scanning Watch Receiver is also just a receiver. So, none of these would work for making a distress call.

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What is the minimum transmitter power level required by the FCC for a medium-frequency transmitter aboard a compulsorily fitted vessel?
  • At least 100 watts, single-sideband, suppressed-carrier power.
  • Correct Answer
    At least 60 watts PEP.
  • The power predictably needed to communicate with the nearest public coast station operating on 2182 kHz.
  • At least 25 watts delivered into 50 ohms effective resistance when operated with a primary voltage of 13.6 volts DC.

47 CFR 80 states: § 80.855 Radiotelephone transmitter. (a) The transmitter must be capable of transmission of H3E and J3E emission on 2182 kHz, and J3E emission on 2638 kHz and at least two other frequencies within the band 1605 to 3500 kHz available for ship-to-shore or ship-to-ship communication.

(b) The duty cycle of the transmitter must permit transmission of the international radiotelephone alarm signal.

(c) The transmitter must be capable of transmitting clearly perceptible signals from ship to ship during daytime under normal conditions over a range of 150 nautical miles.

(d) The transmitter complies with the range requirement specified in paragraph (c) of this section if:

(1) The transmitter is capable of being matched to actual ship station transmitting antenna meeting the requirements of § 80.863; and

(2) The output power is not less than 60 watts peak envelope power for H3E and J3E emission on the frequency 2182 kHz and for J3E emission on the frequency 2638 kHz into either an artificial antenna consisting of a series network of 10 ohms resistance and 200 picofarads capacitance, or an artificial antenna of 50 ohms nominal impedance. An individual demonstration of the power output capability of the transmitter, with the radiotelephone installation normally installed on board ship, may be required.

(e) The transmitter must provide visual indication whenever the transmitter is supplying power to the antenna.

(f) The transmitter must be protected from excessive currents and voltages.

(g) A durable nameplate must be mounted on the transmitter or made an integral part of it showing clearly the name of the transmitter manufacturer and the type or model of the transmitter.

(h) An artificial antenna must be provided to permit weekly checks of the automatic device for generating the radiotelephone alarm signal on frequencies other than the radiotelephone distress frequency.

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Shipboard transmitters using F3E emission (FM voice) may not exceed what carrier power?
  • 500 watts.
  • 250 watts.
  • 100 watts.
  • Correct Answer
    25 watts.

F3E is usually used in the VHF range. Hence, according to 47 CFR 80.215:

(e)Ship stations frequencies above 27500 kHz. The maximum power must not exceed the values listed below.

(1) Ship stations 156-162 MHz - 25W Reducible to 1 watt or less, except for transmitters limited to public correspondence channels and used in an automated system.

The frequencies 156.775 and 156.825 MHz are available for navigation-related port operations or ship movement only, and all precautions must be taken to avoid harmful interference to channel 16. Transmitter output power is limited to 1 watt for ship stations, and 10 watts for coast stations. Marine utility stations and hand-held portable transmitters: 156-162 MHz-10W

(2) Ship stations 216-220 MHz - 25W

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