7-A-096: MF-HF: Propagation #1: Daytime, Nighttime, Winter & Summer
7-96J1:
The "short rules" of propagation necessary to select the appropriate frequency band are:
Shorter distance = Lower Frequency, Daytime = Higher Frequency.
Shorter distance = Higher Frequency, Daytime = Higher Frequency.
Shorter distance = Higher Frequency, Daytime = Lower Frequency.
Shorter distance = Lower Frequency, Daytime = Lower Frequency.
7-96J2:
GMDSS operators should learn which of the following propagation "rules of thumb"?
Longer distance = higher frequency, Shorter distance = lower frequency, Daytime = higher frequency, nighttime = lower frequency.
Longer distance = lower frequency, Shorter distance = higher frequency; Daytime = higher frequency, nighttime = lower frequency.
Longer distance = lower frequency, Shorter distance = lower frequency, Daytime = lower frequency, nighttime = higher frequency.
Longer distance = higher frequency, Shorter distance = higher frequency, Daytime = lower frequency, nighttime = higher frequency.
7-96J3:
What would be the most appropriate HF bands for communicating from San Francisco to Taiwan or the Philippines?
16 or 22 MHz when daylight at each end and 8 MHz when dark at each end.
12 MHz during daylight at each end and 2 MHz when dark at each end.
8 MHz during daylight hours and 16 MHz during darkness.
6 MHz during daylight hours and 8 MHz during darkness.
7-96J4:
GMDSS operators should routinely focus on the factors affecting propagation in what priority?
Distance & time of day, seasonal variations, sunspot cycle, solar flare alerts.
Sunspot cycle, distance & time of day, seasonal variations, solar flare alerts.
Solar flare alerts, distance & time of day, sunspot cycle, seasonal variations.
Solar flare alerts, sunspot cycle, seasonal variations, distance & time of day.
7-96J5:
Which statement concerning frequency band selection and propagation most corresponds with standard practice.
Propagation "rules of thumb" are usually sufficient for routine operations.
Maximum Usable Frequency (MUF) and Optimum Usable Frequency (OUF) should be calculated prior to setting up the transceiver.
Propagation rules, Sunspot cycle status and seasonal variations (winter & summer) must always be employed to calculate the proper band selection.
Propagation "rules of thumb" should be combined with Solar flare alerts to determine band selection.
7-96J6:
To ensure effective HF communications, GMDSS operators should:
Employ the short rules of propagation selection or rely on previous successful communications as a guide.
Disregard the short rules of propagation selection and try different bands until one works.
Do not rely on previous successful communications on the selected frequency band - the ionosphere changes too rapidly and inconsistently.
Rely on the equipment calculations of Optimum Usable Frequency.
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● = Incorrect answer
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