Section-j: mf-hf Equip. And Comms: Key Topic #95: mf-hf fec Operation-2:

95J1 If the vessel is within range of NAVTEX broadcasts and both the Inmarsat-C and the NAVTEX receiver are inoperative the GMDSS operator should:

A. Select 518 kHz ARQ TELEX on the MF/HF console to receive MSI.

B. Request repairs of the Sat-C system and wait until within range of NAVTEX.

C. Select 518 kHz FEC TELEX on the MF/HF console to receive MSI.

D. Select an HF MSI frequency and ARQ TELEX mode to receive MSI.

95J2 If the vessel is beyond range of NAVTEX broadcasts and the Inmarsat-C system fails, the GMDSS operator must:

A. Select 518 kHz ARQ TELEX on the MF/HF console to receive MSI.

B. Request repairs of the Sat-C system and wait until within range of NAVTEX.

C. Select 518 kHz FEC TELEX on the MF/HF console to receive MSI.

D. Select an HF MSI frequency and FEC TELEX mode to receive MSI.

95J3 If the vessel is experiencing atmospheric interference with NAVTEX broadcasts, especially in the tropics, the GMDSS operator should:

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

B. Select one of the 6 HF MSI frequencies and set-up the transceiver in ARQ TELEX mode.

C. Select one of the 6 MF MSI frequencies and set-up the transceiver in FEC TELEX mode.

D. Select the MF MSI frequency dedicated to tropical MSI and set-up the transceiver in FEC TELEX mode.

95J4 Why must the GMDSS operator be able to set-up FEC & ARQ modes and differentiate between them?

A. The proper mode of SFEC must be selected for reception of HF MSI and ARQ selected for initial follow-on TELEX communications in a Distress situation

B. The proper mode must be selected for follow-on TELEX communications in a Distress situation and for the reception of HF MSI.

C. The ARQ TELEX mode must be selected for follow-on TELEX communications in a Distress situation and the BFEC TELEX mode selected for reception of HF MSI.

D. The BFEC TELEX mode must be selected for follow-on TELEX communications in a Distress situation and the ARQ TELEX mode selected for reception of HF MSI.

95J5 BFEC SITOR (NBDP) transmissions might be used to?

A. Receive Coast station traffic lists, NAVTEX and VHF MSI broadcasts.

B. Send and receive Distress TELEX communications and receive HF MSI or NAVTEX.

C. Receive weather messages or download ARQ Coast Station traffic lists.

D. Receive weather messages and send vessel weather OBS messages.

95J6 FEC SITOR (NBDP) transmissions are normally used to?

A. Receive Coast station traffic lists, NAVTEX and VHF MSI broadcasts.

B. Receive weather messages, Coast Station traffic lists and company messages.

C. Receive HF MSI and NAVTEX.

D. Receive company communications sent through coast stations.

Answers: 95J1 - C 95J2 - D 95J3 - A 95J4 - B 95J5 - B 95J6 - C

Section-j: mf-hf Equip. And Comms: Key Topic #96: mf-hf Propagation-1; Day-Night-Winter-Summer:

96J1 The "short rules" of propagation necessary to select the appropriate frequency band are:

A. Shorter distance = Higher Frequency, Daytime = Higher Frequency.

B. Shorter distance = Lower Frequency, Daytime = Higher Frequency.

C. Shorter distance = Higher Frequency, Daytime = Lower Frequency.

D. Shorter distance = Lower Frequency, Daytime = Lower Frequency.

96J2 GMDSS operators should learn which of the following propagation "rules of thumb"?

A. Longer distance = lower frequency, Shorter distance = higher frequency; Daytime = higher frequency, nighttime = lower frequency.

B. Longer distance = lower frequency, Shorter distance = lower frequency, Daytime = lower frequency, nighttime = higher frequency.

C. Longer distance = higher frequency, Shorter distance = lower frequency, Daytime = higher frequency, nighttime = lower frequency.

D. Longer distance = higher frequency, Shorter distance = higher frequency, Daytime = lower frequency, nighttime = higher frequency.

96J3 What would be the most appropriate HF bands for communicating from San Francisco to Taiwan or the Philippines?

A. 12 MHz during daylight at each end and 2 MHz when dark at each end.

B. 8 MHz during daylight hours and 16 MHz during darkness.

C. 6 MHz during daylight hours and 8 MHz during darkness.

D. 16 or 22 MHz when daylight at each end and 8 MHz when dark at each end.

96J4 GMDSS operators should routinely focus on the factors affecting propagation in what priority?

A. Distance & time of day, seasonal variations, sunspot cycle, solar flare alerts.

B. Sunspot cycle, distance & time of day, seasonal variations, solar flare alerts.

C. Solar flare alerts, distance & time of day, sunspot cycle, seasonal variations.

D. Solar flare alerts, sunspot cycle, seasonal variations, distance & time of day.

96J5 Which statement concerning frequency band selection and propagation most corresponds with standard practice.

A. Maximum Usable Frequency (MUF) and Optimum Usable Frequency (OUF) should be calculated prior to setting up the transceiver.

B. Propagation rules, Sunspot cycle status and seasonal variations (winter & summer) must always be employed to calculate the proper band selection.

C. Propagation "rules of thumb" should be combined with Solar flare alerts to determine band selection.

D. Propagation "rules of thumb" are usually sufficient for routine operations.

96J6 To ensure effective HF communications, GMDSS operators should:

A. Employ the short rules of propagation selection or rely on previous successful communications as a guide.

B. Disregard the short rules of propagation selection and try different bands until one works.

C. Do not rely on previous successful communications on the selected frequency band – the ionosphere changes too rapidly and inconsistently.

D. Rely on the equipment calculations of Optimum Usable Frequency.

Answers: 96J1 - B 96J2 - C 96J3 - D 96J4 - A 96J5 - D 96J6 - A