Login or Register for FREE!
Login or Register for FREE!
Subel. J
6 questions
Subelement J

MF-HF Equip. and Comms:

Section 96

MF-HF Propagation-1; Day-Night-Winter-Summer

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

  • Shorter distance = Higher Frequency, Daytime = Higher Frequency.
  • Correct Answer
    Shorter distance = Lower Frequency, Daytime = Higher Frequency.
  • Shorter distance = Higher Frequency, Daytime = Lower Frequency.
  • Shorter distance = Lower Frequency, Daytime = Lower Frequency.
This question does not yet have an explanation! Register to add one

Tags: none

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

  • 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.
  • Correct Answer
    Longer distance = higher frequency, Shorter distance = lower frequency, Daytime = higher frequency, nighttime = lower frequency.
  • Longer distance = higher frequency, Shorter distance = higher frequency, Daytime = lower frequency, nighttime = higher frequency.
This question does not yet have an explanation! Register to add one

Tags: none

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

  • 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.
  • Correct Answer
    16 or 22 MHz when daylight at each end and 8 MHz when dark at each end.
This question does not yet have an explanation! Register to add one

Tags: none

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

  • Correct Answer
    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.
This question does not yet have an explanation! Register to add one

Tags: none

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

  • 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.
  • Correct Answer
    Propagation "rules of thumb" are usually sufficient for routine operations.
This question does not yet have an explanation! Register to add one

Tags: none

To ensure effective HF communications, GMDSS operators should:

  • Correct Answer
    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.
This question does not yet have an explanation! Register to add one

Tags: none

Go to 95 Go to 97
HamStudy.org™ is copyright 2024 Signal Stuff™, All rights reserved.
View Privacy Policy    |    Get help with HamStudy.org™