Which of the following can be used to reinforce the upward beam in a marker beacon?(a) Reflector(b) Amplifier(c) Counterpoise(d) Vertical polarizationThis question was posed to me during an online interview.The above asked question is from Point Source Radio Systems in chapter Terrestrial Radio Navigation System of Avionics

Which of the following can be used to reinforce the upward beam in a m

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 polarizationThis question was posed to me during an online interview.The above asked question is from Point Source Radio Systems in chapter Terrestrial Radio Navigation System of Avionics
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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