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Helical antenna is mainly used for ________

(a) bandwidth calculation

(b) production of video signals

(c) radio transmission

(d) satellite tracking

This question was posed to me in an interview for job.

I'm obligated to ask this question of Costas Loop in portion Double Sideband Suppressed Carrier Modulation of Analog Communications

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Right option is (d) satellite tracking

To explain I would say: A helical antenna is made of one or more conducting wires wound in the form of a helix. It is used for the communication (transmitting and receiving) Very High Frequency (VHF) signals through the different layers of atmosphere. Thus, it is used in satellite tracking.

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