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What type of transmitter is used in a Decca system?

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What type of transmitter is used in a Decca system?

(a) Frequency synthesizer

(b) Local oscillator

(c) Crystal controlled

(d) Digital

I have been asked this question in semester exam.

My enquiry is from Hyperbolic Radio Systems in portion Terrestrial Radio Navigation System of Avionics

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The correct answer is (c) Crystal controlled

To explain I would say: A typical Decca chain consists of a master station and three slave stations. A station has a 2kW crystal controlled transmitter feeding a 300ft antenna.

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