GMDSS Radio Maintainer's License

It becomes necessary to construct a temporary VHF marine antenna. What should be the approximate length of the antenna?

Which of the following best describes a VHF collinear array?

A masthead antenna with a base loading coil appears shorted to an ohmmeter check. What might this indicate?

What is the most common type of coax connector used on VHF transceivers?

What type of coaxial cable would be most appropriate for a long transmission line run?

What is a disadvantage when using high gain VHF antennas?

What are the correct VHF Channels and Frequencies for Calling/Distress, DSC and bridge-to-bridge operations?

What is the frequency separation between Transmit and Receive frequencies on a duplex channel?

What is the assigned channel spacing for VHF channels?

What is the allowed frequency tolerance for the DSC carrier frequencies?

Using a frequency counter with an accuracy of 2 ppm — which of the following are within legal tolerance for the frequencies of 156.800 MHz and 156.525 MHz?

Using a frequency counter with an accuracy of 5 ppm — which of the following are within legal tolerance for the frequencies of 156.875 MHz and 157.200?

What is the purpose of the USA-INT switch?

What may happen if the USA-INT control is left on INT when in U.S. waters?

What is the purpose of the Dual Watch function?

What is the proper adjustment of the squelch control for maximum sensitivity?

Which of the following transmitter power levels are permitted by FCC rules?

Which of the following controls is not found on a VHF-DSC transceiver?

Which of the following best describes the “Capture effect?”

Which of the following may be adjusted in a FM ratio detector for improved signal-to-noise?

What is the function of a properly adjusted limiter circuit?

Which of the following are true about SINAD measurements?

What would be considered a normal sensitivity for 10 db of quieting in a VHF marine receiver?

What is meant by “full quieting” in a FM VHF receiver?

What condition may prevent a VHF radio receiver from staying tuned to the desired channel?

What fault may exist if a VHF radio receiver fails to produce audible output from the speaker and the squelch control has no effect?

What is indicated if a VHF radio fails to receive nearby stations and a voltmeter connected between the positive side of a radio’s DC line and ground reads zero line voltage? The fuse in the VHF radio also reads zero when checked with an ohmmeter.

What fault may exist if a VHF radio receiver fails to produce audible output from the speaker and the squelch control has no effect?

What condition may prevent a VHF radio receiver from receiving a weak signal?

Which of the following is the best test procedure to isolate the source of distortion in the audio output of a receiver?

What condition may cause a significant loss in VHF receiver sensitivity?

Which of the following test procedures may be used to determine a VHF receiver’s minimum discernible signal?

Which of the following procedures may be used in many U.S. ports as a quick field test to determine if a shipboard VHF receiver is operating properly?

What ohmmeter reading may indicate a faulty component in a VHF receiver?

What condition may indicate a VHF receiver fault?

What condition may cause noisy operation of a VHF receiver?

What is the maximum allowable deviation of a marine VHF transmitter?

What is the modulation index?

How is pre-emphasis used in an FM transceiver?

A modulation index set to less than 1 to 1 may result in what?

What is the most common type of emission for shipboard VHF-DSC transceivers?

How many sidebands does a VHF FM transmitter have?

What condition may be indicated if a VHF radio is unable to contact nearby stations and an inline wattmeter indicates power outputs of 1 watt (LOW power) mode and 8.5 watts (HIGH power) mode with +12.8 vdc applied to the radio’s DC line?

Antenna system matching can be analyzed by determining the Standing Wave Ratio (SWR). Which of the following is the best test procedure to measure the SWR of a marine VHF antenna system?

A mismatched antenna system can degrade marine VHF radio performance. Antenna system matching can be analyzed by determining the Standing Wave Ratio (SWR). Which of the following is the best test procedure to determine the VHF antenna system SWR?

What may be indicated if a VHF radio operates normally but the transmitter produces nearly zero RF output in the high power mode on all marine channels?

What condition may indicate voltage controlled oscillator failure in the synthesizer of a VHF transmitter?

What condition may exist if a VHF radio is operational in receive mode but unable to transmit?

What condition may be indicated if a VHF radio cannot contact nearby stations on any channel, an inline wattmeter indicates 25 watts output (HIGH power mode), and no modulation is heard when the transmitted signal is monitored with an external receiver?

What condition may be indicated if a VHF radio cannot contact nearby stations, an inline wattmeter indicates less than 1 watt output (HIGH power mode), and nominal voltage (e.g., 12.8 vdc) is applied to the VHF radio power input line?

A spectrum analyzer (SPECAN) can be a useful test instrument to troubleshoot a marine VHF radio. Which of the following is the best procedure to evaluate the input/output stages of a marine VHF transmitter?

Which in-line RF power reading indicates the proper operation of a VHF marine transmitter?

What condition may cause distortion in the modulator stage of a marine VHF transmitter?

What terms are used to describe a device used to test the RF power output of a marine VHF transmitter without emitting a signal on the air?

What is the correct frequency shift and sub-carrier for VHF-DSC?

What is the correct modulation rate and index of modulation for VHF-DSC?

How might a DSC radio check be accomplished with a coast station?

You attempt to program a new MMSI into a VHF radio with an existing MMSI. The radio will not accept the entry. What is the best course of action to correct this problem?

What is the time diversity reception interval for a VHF-DSC call?

What might a voltmeter indicate when testing a DSC circuit for an outgoing message data stream?

What is the assigned bandwidth and channel spacing for J3E voice transmissions?

What is the assigned bandwidth and channel spacing for J2B SITOR (NBDP) transmissions?

What is the allowable frequency tolerance for GMDSS MF-HF transmitters?

Using a frequency counter with an accuracy of 2 ppm which of the following are within legal tolerance for the frequencies of 2182.0 kHz and 4125.0 kHz? The counter has a display resolution of 1 Hz.

Which of the following are assigned frequencies for Digital Selective Calling?

What are the assigned frequencies for VOICE and SITOR (NBDP) follow on communications?

What is the purpose of the “R.I.T.“ control on a MF/HF transceiver?

What is the function of the “TUNE” button on a MF/HF transceiver?

What is the purpose of the “ENTER” function.

What mode is a MF/HF transceiver operating in when “TLX” displayed?

Reducing the “RF Gain” control on an MF/HF transceiver has what effect?

What is the function of an “AGC” button?

What is the purpose of the BFO?

If the BFO is turned off what kind of emissions can still be received?

If you are listening to another vessel’s HF transmission and it sounds garbled what should you do?

What characteristics are desirable in an AGC circuit for SSB voice reception?

What is the primary purpose of both a high and a low I.F. system in a HF receiver?

How does a noise blanker circuit work in a HF receiver?

The voice is garbled and unreadable on MF/HF SSB channels. What is the most likely cause?

All signals sound normal on an MF/HF receiver except one that has a very high pitched voice barely readable. What is the most likely cause?

You are able to hear signals in the voice/SSB mode but not in the SITOR (NBDP) mode. What is the most likely cause?

The phase locked loop circuit in an MF/HF receiver appears to be faulty. What is the most likely cause?

You are able to hear signals in the SITOR (NBDP) mode but not in the voice/SSB mode. What is the most likely cause?

The AGC function of an MF/HF receiver is inoperative. What is the most likely cause?

The MF/HF receiver fails to suppress the AF output in the absence of a sufficiently strong input signal. What is the most likely cause?

The MF/HF receiver fails to produce any AF output. An ohmmeter reading is near zero between speaker leads. What is the most likely cause?

The MF/HF transceiver produces strong AF output but no signals are heard on any frequency. What is the most likely cause?

The MF/HF transceiver produces strong AF output but no signals are heard on any frequency. What is the most likely cause?

The MF/HF transceiver fails to produce AF output but the radio is powered on and “TX” is illuminated. What is the most likely cause?

A received signal on a MF/HF transceiver breaks up rapidly and repeatedly. The signal alternates between mid scale and zero on the “Signal” meter. What is the most likely cause?

How is a J3E signal generated?

What would be the most likely power level to use for initial MF-HF communications?

How is the lower sideband eliminated?

What is the most common method of generating a SITOR (NBDP) signal on shipboard GMDSS equipment?

What are the major components of a phase locked loop frequency synthesizer?

What is the purpose of a phase comparator in a frequency synthesizer?

An MF-HF transceiver works properly on voice but not SITOR (NBDP). What is the most likely source of the problem?

Which of the following conditions would indicate the malfunction of a 2182 kHz radiotelephone system?

Which would be an indication of proper operation of a SSB transmitter rated at 60 watt PEP output?

An MF-HF transceiver is functioning correctly in voice mode/SSB but not in SITOR (NBDP). What is the most likely source of the problem?

Which of the following conditions would be a symptom of malfunction in a 2182 kHz SSB radiotelephone?

Which would indicate proper operation of a SSB transmitter rated at 60 Watt PEP output in J3E mode?

Which of the following conditions indicate the proper operation of a 150 Watt MF/HF transmitter in the F1B ARQ mode?

Which of the following conditions indicate the proper operation of a 250 Watt MF/HF transmitter in the F1B FEC mode?

Which of the following conditions could cause very low RF output in a MF/HF transmitter operating in the F1B FEC mode?

which of the following troubleshooting methods is not valid for finding the fault in a MF/HF transmitter operating in the F1B FEC mode?

Which of the following conditions could cause zero RF output in a MF/HF transmitter operating in the F1B FEC mode?

Which of the following conditions indicate improper operation of a 150 Watt MF/HF transmitter in the F1B FEC mode?

What precedes the phasing signal in a DSC distress alert call?

What type of code is used for DSC transmissions?

What is the correct frequency shift and sub-carrier for MF-HF-DSC?

What is the time diversity reception interval for a MF-HF-DSC call?

A MF/HF Distress priority DSC call may be formatted to include the following:

What statement is false concerning DSC calls addressed to MMSI 003669999?

Which of the following statements concerning SITOR (NBDP) communications is true?

What statement is true regarding the exchange between two stations engaged in SITOR (NBDP) communications?

Which of the following is true of SITOR (NBDP) ARQ mode:

Which of the following keystrokes or characters follows most commands in ARQ communications when working an automated Coast Station?

Which characters are sent by the ship station to indicate a desire to send a message via a direct connection to a shoreside TELEX subscriber?

What are the characters that are transmitted to terminate a direct TELEX connection in SITOR (NBDP) operations?

If a vessel is within range of NAVTEX broadcasts and both the Inmarsat-C and the NAVTEX receiver are inoperative the GMDSS operator should:

The sequence ARQ, FEC, SFEC best corresponds to which of the following sequences?

Selective FEC communications (SFEC) are employed when:

Which of the following is true of SITOR (NBDP) Mode B (FEC), in the presence of static crashes.

If the vessel is beyond range of NAVTEX broadcasts and the Sat-C system fails, the GMDSS operator must:

If the vessel is experiencing atmospheric interference with NAVTEX broadcasts, especially in the tropics, the GMDSS operator should:

What is the purpose of the antenna tuner?

What is the electrical effect of an inductance in series with the antenna?

What is the electrical effect of a capacitance in series with the antenna?

Which of the following coaxial cables is suitable for use in GMDSS MF/HF antenna systems?

A ship’s MF-HF whip antenna breaks off and is carried away in a storm. What would you do to regain operation on MF-HF GMDSS frequencies?

Which of the following connectors is often used in GMDSS MF/HF antenna systems?

What are the frequencies for Inmarsat-C shipboard satellite operation?

What is an LNA?

What function does the LNA perform?

What is the fade margin factor?

What is signal to noise ratio?

What is the abbreviation for signal to noise?

Which of the following actions should be taken to minimize shock hazard of an Inmarsat terminal?

How do you perform a LOOP BACK test?

What do EGC messages contain?

Which of the following is not recommended for Inmarsat-C antenna installations?

How many NCS’s operate in each Inmarsat ocean region per Inmarsat system?

What type of services cannot be provided by the Inmarsat-C system?

The U.S. National Data Center that monitors polling input for each US Flag ship:

LRIT Long Range Information Tracking data:

LRIT Long Range Information Tracking:

When a compulsory equipped IMO ship is not correctly broadcasting LRIT Info what action should be taken?

What must a LRIT terminal do?

What satellite system does not support LRIT?

Which of the following Inmarsat units stores configuration data and contains all user interfaces and LED indicators?

Which of the following is not a function of an Inmarsat Fleet Broadband IP handset?

Which of the following best describes Inmarsat BGAN Streaming Data service?

Which of the following is the best procedure to test the Inmarsat Distress Alarm?

Which of the following is the correct Fax/Data configuration of a Fleet Broadband terminal?

Which of the following is not a characteristic of an Inmarsat Fleet Broadband IP handset?

What protocol can be used in connecting a PC to the LAN interface of an Inmarsat terminal?

When is a PIN Unlock Key (PUK) used with an Inmarsat terminal?

Which of the following is NOT a function of the LAN port on a Fleet Broadband terminal?

What is the configuration for Thrane & Thrane F250 & F500 facsimile operation?

What is the configuration Thrane & Thrane F500 for standard voice telephone operation?

Which of the following best describes a Subscriber Identity Module (SIM)?

What is the usual arrangement of GPS satellites?

What is the purpose of the Differential GPS system and how does it work?

How is the GPS usually interconnected with other bridge equipment?

Which of the following statements is true?

Which of the following best describes the GPS satellite signals transmitted?

What is the minimum number of satellites that must be received to provide the highest accuracy?

Which of the following best describes the polarization of a satellite signal?

Which of the following is characteristic of the parabolic dish antenna?

Which of the following best describes a phased array antenna system?

Which of the following is characteristic of an Inmarsat-C antenna?

What is a best practice for installing Inmarsat satellite antennas aboard ship?

What components does an Inmarsat Fleet Broadband RADOME typically include?

Which of the following conditions would prevent communications between an Inmarsat-C data port and external data terminal equipment (DTE)?

How can a LES/RCC (Rescue Coordination Centre) determine if an Inmarsat-C Distress Alert is a TEST transmission?

What is the meaning of the “ACB” Inmarsat-C Non-Delivery Notification (NDN) failure code?

What condition can indicate a communication failure between the second receiver (RX2) and the Antenna Control Unit (ACU) in an Inmarsat Fleet 77 terminal?

Which of the following devices can cause interference to Fleet 77/55 systems?

What error message may be displayed if a connection to the Inmarsat Mobile Packet Data Service (MPDS) network fails?

An Inmarsat-C terminal shows a “No Receive Signal” alarm. There is no voltage on the antenna center pin. What is the most likely cause?

An Inmarsat-C terminal will not “LOG IN”. A test antenna cable with a new ADE attached in view of the satellite allows the terminal to “LOG IN”. What steps would you take?

An Inmarsat-C terminal will not “LOG IN” and shows an “Antenna not connected” alarm. What action would you take?

The antenna goes past the AZ EL of the satellite but does not initialize but you can manually point the antenna at the satellite and acquire signal. What is the most likely problem?

The antenna creeps up and down after initialization. What action would you take?

The antenna tries to initialize then points straight up and stops. What is the most likely problem?

What action should be taken if an Inmarsat Fleet Broadband antenna continuously changes azimuth after initialization?

What condition would cause failure of an Inmarsat-C terminal to power up when AC voltage is present at the input terminals of the power supply?

What condition would cause an IP connection failure between a technician’s laptop and an Inmarsat Fleet Broadband terminal?

What condition would cause a connection failure between a technician’s laptop and an Inmarsat Fleet Broadband terminal?

Interference induced from nearby HF transmitters may cause Inmarsat system failures. What is the most appropriate action to resolve this problem?

What condition will lower the observed bit rate on a Fleet Broadband terminal?

Which is not a function of a satellite under COSPAS-SARSAT using satellite EPIRBs?

What is the purpose of the magnet in the EPIRB mounting bracket?

How often must the EPIRB battery be replaced?

What feature is not a component of a 406 MHz satellite EPIRB?

How often must the automatic release mechanism be replaced.

Which of the following is normally part of 406 MHz satellite EPIRBs?

How should the signal from a Search And Rescue RADAR Transponder appear on a RADAR display?

In what frequency band does a search and rescue transponder operate?

What causes the SART to begin a transmission?

At what interval must the SART’s battery be replaced?

At what interval must the SART’s battery be replaced?

What are the characteristics of the SART transmitted signal?

What is the approximate distance between dots on a radar display at a distance of 5 miles?

How often must the Survival Craft Transceiver battery be changed?

What is the minimum receiver sensitivity required for a Survival Craft Transceiver?

What is the minimum required effective radiated power?

Equipment for radiotelephony use in survival craft stations under GMDSS must have what capability?

Which statement is NOT true regarding the requirements of survival craft portable two-way VHF radiotelephone equipment?

Equipment for radiotelephony use in survival craft stations under GMDSS must have what characteristics?

The NAVTEX is powering on and appears to be functioning normally except there have been no new messages for an extended period. The station settings are correct. What is the most likely source of the problem?

How is a NAVTEX receiver programmed to reject certain messages?

How is accuracy insured in NAVTEX broadcasts?

NAVTEX broadcasts are sent:

What is the normal voltage of a single NICAD battery cell?

What is the effect of temperature on the specific gravity of lead acid batteries?

What will cause an individual battery cell to reverse polarity?

What is the normal specific gravity of a fully charged lead acid battery cell? What device is used to measuring the electrolyte of a lead acid battery?

What is a gel cell battery and how is it maintained & cared for?

What is the normal voltage of a single lead acid battery cell?

How often should high charging be use with a standard lead acid battery and a fully automatic GMDSS compliant Battery charger?

What are the different modes of charging for a GMDSS compliant battery charger/supply?

What would be an indication of a malfunction on a GMDSS station with a 24 VDC battery system?

What is the meaning of “Reserve Source of Energy”?

With a fully automatic GMDSS compliant battery charger / power supply, when must the high charging process be interrupted?

A fully automatic GMDSS compliant Battery charger/ Power supply’s high (Full) charging mode must be disabled during setup for what type batteries?

Which of the following best describes a standard full wave rectifier power supply?

Which of the following statements concerning power supply filters is true?

What are the main advantages of using switcher type power supply?

What are the disadvantages of using a switcher type power supply?

Power supplies with inductive input filters have the following characteristics:

Power supplies with capacitive input filters have the following characteristics:

What is the function of a crowbar circuit?

Which of the following is not one of the main advantages of a switching power supply?

What is the configuration for a mains operated switching power supply with output regulation?

Which of the following statements about switching power supplies is the most accurate?

What are the input/output voltages of a “BUCK” switching power supply with a 50% duty cycle?

Which of the following statements about a switching mode power supply input current is correct?

The printer will not print a document. Which of the following is NOT a likely reason?

There is no display on the monitor. What are the most likely causes?

What are the four main functions of the “BIOS” in most computers?

Power is on but the computer will not boot into the operating system. What steps should you take?

How do you determine the type of disc drives in an XP system?

What are important considerations when replacing a CD-ROM drive?

Nodes in an Ethernet network are interconnected using a cable making a “Home Run“back to the central:

What is the maximum length of a USB 2.0 cable between two hubs or between a hub and peripheral?

10Base-T and 100Base-TX systems generally uses the following type of cable:

What initial steps should be taken when installing a router?

What are the most commonly used IP addresses for routers?

In an Ethernet network, the available bandwidth is shared between all nodes within the same:

A typical PC program that is used widely for logging and troubleshooting NMEA 0183 data is:

what is the maximum signal voltage range that an NMEA-0183 unit must be capable of handling without damage?

The current and most recent version of NMEA 0183 uses what standard for data communications?

What type of data communication is used for NMEA 0183.

Which of the following statements about an NMEA -0183 system is correct?

An important difference between NMEA 0183 and NMEA 2000 is:

The Voltage of the NMEA 2000 backbone power supply pair must be maintained to within the following range.

NMEA 2000 Certified Device identify their current requirements in terms of LENs (load Equivalent Number). 1 LEN is equal to:

Which of the following are NOT components of a NMEA 2000 network?

The NMEA 2000 backbone operating speed is:

When viewing NMEA 2000 data you must use the following. A Voltmeter

What is the maximum length for a drop cable to a single NMEA 2000 device?

What is a common range of frequencies used for depth finding equipment?

What is a common range of pulse widths used for depth finding equipment?

What is the purpose of the “carbon pile” on an older gyro compass?

What are the principles of operation of a fiber-optic gyro compass?

How does the Ship Security Alert System operate?

AIS units use the following:

What procedure must be followed before using C-Map charts for an Electronic Chart System?

Which of the following lists of data inputs for an Electronic Chart System is incorrect?

Which of the following is a necessary component of an auto pilot?

What inputs are normally required for an Auto Pilot?

Which of the following is not an accurate list of functions/data recorded by the Vessel Data Recorder?

Which of the following statements about Vessel Data Recorders is NOT true?

What is the best method for grounding an Inmarsat-C terminal?

What is the most important consideration for installing a Full-Duplex VHF radiotelephone.

What is the most important factor when locating depth finder transducers?

Bridge equipment separation recommendations generally refer to what instrument?

When installing an Inmarsat-C antenna what should be the minimum distance to other Inmarsat antennas?

What action must be taken after an Inmarsat-C system is fully installed?

What are the operator’s license requirements for conducting a GMDSS ship station annual inspection?

What log entries are required after passing the annual inspection?

What battery tests are made during the annual inspection?

What is the easiest way to test the Inmarsat-C terminal for proper operation?

After the station has successfully passed the survey what document is issued to the vessel?

Which of the following is NOT a required VHF test during an annual inspection?

A 4 digit multi-meter with an accuracy of 0.15% and 2 counts is set on the 6 volt scale. What range of readings may be expected when measuring a 5 volt DC source?

A 4 digit multi-meter with an accuracy of 0.15% and 2 counts is set on the 60 volt scale. What range of readings may be expected when measuring a 24 volt DC source?

What is the most important specification for an R. F. Signal Generator used at VHF frequencies?

A good lab type signal generator for VHF measurements should be able to reduce its output to:

The characteristics of a 10:1 attenuation probe for an oscilloscope is as follows:

In dual-trace oscilloscopes the purpose of the “Mode” control is to:

What type of signals are usually provided by a simple Function Generator?

a SINAD meter consists of a multi-range audio frequency voltmeter:

Which of the following statements about a logic probe is false?

An analog RF wattmeter provides the most accurate reading:

What is the purpose of a deviation meter?

What would be the most likely reason to observe the transmitter output with a spectrum analyzer?