Login or Register for FREE!
Login or Register for FREE!
Subel. B
6 questions
Subelement B
MF-HF-DSC-SITOR (NBDP) Equip. & Ops:
Section 16
Transmitter Tech:
How is a J3E signal generated?
  • By using high-level modulation to produce a single sideband.
  • Correct Answer
    By using a double balanced mixer and a sideband filter.
  • By using the audio signal to phase modulate the carrier.
  • By using low level modulation and a sideband filter.
This question does not yet have an explanation! Register to add one

Tags: none

What would be the most likely power level to use for initial MF-HF communications?
  • 25 watts PEP
  • 50 watts PEP
  • Correct Answer
    150 watts PEP
  • 600 watts PEP
This question does not yet have an explanation! Register to add one

Tags: none

How is the lower sideband eliminated?
  • By using a double balanced mixer to block the lower sideband.
  • By using a filter to pass the lower sideband and block the upper sideband.
  • By using a double balanced mixer to insert the carrier.
  • Correct Answer
    By using a filter to pass the upper sideband and block the lower sideband.
This question does not yet have an explanation! Register to add one

Tags: none

What is the most common method of generating a SITOR (NBDP) signal on shipboard GMDSS equipment?
  • Correct Answer
    Two alternating sidebands of 1615 Hz and 1785 Hz are offset from the carrier frequency by 1700 Hz.
  • The carrier frequency is alternately shifted from + 85 Hz to - 85 Hz while suppressing the sidebands.
  • There is one 1500 Hz sideband which is shifted from +170 Hz to - 170 Hz with a suppressed carrier.
  • Two alternating sidebands of 1500 Hz and 2300 Hz are offset from the carrier frequency by 1900 Hz.
This question does not yet have an explanation! Register to add one

Tags: none

What are the major components of a phase locked loop frequency synthesizer?
  • Ratio detector, master oscillator, limiting amplifier and voltage controlled oscillator.
  • Phase comparator, loop filter, master oscillator and first mixer stage.
  • High pass filter, master oscillator, double balanced mixer and voltage controlled oscillator.
  • Correct Answer
    Master oscillator, frequency dividers, phase comparator, loop filter and voltage controlled oscillator.
This question does not yet have an explanation! Register to add one

Tags: none

What is the purpose of a phase comparator in a frequency synthesizer?
  • Correct Answer
    Compare the divided outputs of the master oscillator and the voltage controlled oscillator.
  • Compare the direct outputs of the master oscillator and the voltage controlled oscillator.
  • Compare the direct output of the master oscillator and the divided output of the voltage controlled oscillator.
  • Compare the divided output of the master oscillator and the direct output of the voltage controlled oscillator.
This question does not yet have an explanation! Register to add one

Tags: none

Go to 15 Go to 17
HamStudy.org™ is copyright 2024 Signal Stuff™, All rights reserved.
View Privacy Policy    |    Get help with HamStudy.org™