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_____ acts as a coarse tuning device for the antenna?

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_____ acts as a coarse tuning device for the antenna?

(a) Loop

(b) Helix

(c) Amplifiers

(d) Filters

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Enquiry is from Hyperbolic Radio Systems topic in portion Terrestrial Radio Navigation System of Avionics

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Right choice is (b) Helix

To explain I would say: The RF signal that is to be transmitted is transferred to the ‘Helix,’ a large helical coil that acts as a coarse tuning device for the antenna. The helix is equipped with separate taps for each signal frequency transmitted.

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