1.

Which of the following can be used to reinforce the upward beam in a marker beacon?(a) Reflector(b) Amplifier(c) Counterpoise(d) Vertical polarization

Answer» Right choice is (c) Counterpoise

For explanation I would say: The marker beacons use an array of half wave radiators that are aligned in line with the airway. A wire mesh counterpoise below this array can be used to reinforce the upward beam by increasing the signal strength in a particular direction.


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