GMDS 113

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

A. +/- 85 Hz and 1700 Hz

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

A. 1300-2100 Hz, sub-carrier 1700 Hz.

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

A. 200-400 kHz

The NMEA 2000 backbone operating speed is:

A. 250 bps

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

A. A reading of 9.6 when a voltmeter is connected between the positive side of the radio's DC line and ground.

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

A. After the EPIRB's position is calculated using the Doppler shift COSPAS-SARSAT satellites provide follow-on SAR communications.

Which of the following best describes a VHF collinear array?

A. An antenna with phased elements, omni directional radiation pattern, offering up to 9 db gain.

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

A. Ch-16, 156.800 MHz, Ch-70, 156.525 MHz and Ch-13, 156.650 MHz.

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

A. Charging, Change-over, Parallel

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

A. KKKK

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

A. Radar, SSAS and Position.

Which of the following statements is true?

A. The L2 carrier of 1227.60 MHz is used to measure the ionospheric delay.

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

A. The transceiver is connected to a "Dummy Load."

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

A. Transformers use a ferrite core to reduce losses at high frequencies.

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?

B. 23.62 to 24.38 volts DC

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

B. A high Standing Wave Ratio (SWR) in the antenna system.

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

B. A3E and H3E

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

B. Both "Red" and "Green" LEDs on indicate a short.

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

B. Can re-boot the AIS broadcasting unit.

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

B. Fax - Group 3 fax via 3.1 kHz audio channel for analog fax applications.

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

B. Higher temperature results in a lower specific gravity reading.

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

B. Make slight adjustments in the receiver frequency.

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

B. Select one of the 8 HF MSI frequencies and set-up the transceiver in FEC TELEX mode.

What type of data communication is used for NMEA 0183.

B. Serial

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

B. The 500 Hz I.F. filter has become defective.

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

B. The output signal of the Phase Locked Loop (PLL) circuit in the frequency synthesizer has become unlocked.

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?

B. There is an open connection in the microphone cable or connector.

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

B. Use the Web interface to check the event log.

How often must the Survival Craft Transceiver battery be changed?

C. 5 years or after use for distress communications.

What log entries are required after passing the annual inspection?

C. Certification by both the inspecting technician and the vessel's Master/owner that the inspection was successful.

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

C. In SITOR (NBDP) communications, the power meter can be seen fluctuating regularly from zero to the 60 watt relative output reading.

What initial steps should be taken when installing a router?

C. Open web browser, enter router's address for network admin and enter username and password.

What is the abbreviation for signal to noise?

C. SNR

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?

C. The RF amplifier at the antenna base is defective.

Which of the following best describes the "Capture effect?"

C. The receiver will reject all but the strongest signal.

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?

C. The transmitter output is low in the high power mode but it is still functioning within FCC specifications.

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

D. "PL-259" Connector

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

D. 300 Hz and 500 Hz

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

D. 5 kHz

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

D. A series of 12 equally spaced dots.

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

D. An Inductive input has good voltage regulation, high transformer utilization factor, low rectifier peak currents and relatively low output voltage.

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

D. Broadcast a SAFETY priority call to all stations immediately prior to initiating the Distress Alarm.

16B3 How is the lower sideband eliminated?

D. By using a filter to pass the upper sideband and block the lower sideband.

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?

D. Install a replacement ADE.

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

D. Maximum separation between transmitting antenna and the duplex receiver antenna.

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

D. One

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

D. The antenna is RHC polarized with an omni-directional radiation pattern.

What is the purpose of the USA-INT switch?

D. To change from duplex to simplex operation on designated channels in U.S. waters.

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

D. Use of a "null" MODEM cable to connect the DTE device.

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

D. Use the BIOS setup mode to check for proper BIOS settings.