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

Satellite Systems:

Section 31

Equipment Faults and troubleshooting-2:

An Inmarsat-C terminal shows a "No Receive Signal" alarm. There is no voltage on the antenna center pin. What is the most likely cause?

  • Defective AZ or EL motor in the above deck equipment.
  • Blown line fuse in the terminal's DC power supply.
  • Correct Answer
    Blown antenna power fuse in the above deck equipment.
  • Defective Low Noise Amplifier in the above deck equipment.
This question does not yet have an explanation! Register to add one

Tags: none

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?

  • Replace the AZ or EL motor in the above deck equipment.
  • Try logging into a different satellite with the original ADE.
  • Use a DVM to check the feedline between the terminal and ADE.
  • Correct Answer
    Install a replacement ADE.
This question does not yet have an explanation! Register to add one

Tags: none

An Inmarsat-C terminal will not "LOG IN" and shows an "Antenna not connected" alarm. What action would you take?

  • Correct Answer
    Short one end of coax cable. If the resistance is above one ohm replace the cable.
  • Change to a different satellite and try a new "LOG IN".
  • Replace the antenna unit.
  • Replace the AZ-EL board.
This question does not yet have an explanation! Register to add one

Tags: none

The antenna goes past the AZ EL of the satellite but does not initialize but you can manually point the antenna at the satellite and acquire signal. What is the most likely problem?

  • Defective coax cable.
  • Correct Answer
    Faulty antenna control module.
  • Bad I.F. amplifier.
  • Bad Gyro repeater motor.
This question does not yet have an explanation! Register to add one

Tags: none

The antenna creeps up and down after initialization. What action would you take?

  • Check AZ step motor with power off. If it is stiff replace the motor.
  • Correct Answer
    Check EL step motor with power off. If it is stiff replace the motor.
  • Replace the platform sensor.
  • Replace the gyro repeater motor.
This question does not yet have an explanation! Register to add one

Tags: none

The antenna tries to initialize then points straight up and stops. What is the most likely problem?

  • A defective EL motor.
  • A defective AZ motor.
  • Correct Answer
    A defective level platform sensor.
  • A defective I.F. amplifier.
This question does not yet have an explanation! Register to add one

Tags: none

Go to 30 Go to 32
HamStudy.org™ is copyright 2024 Signal Stuff™, All rights reserved.
View Privacy Policy    |    Get help with HamStudy.org™