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Радіотехніка-Радіоелектронні апарати(Тюренкова-...doc
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I. Reading Exercises:

Exercise 1. Read and memorize using a dictionary:

line-of-sight, longwave signal, beam, ray, lightship, devising mean, distress signal, obsolete, diverse, range

Exercise 2. Answer the questions:

  1. What was communication limited to, prior to the introduction of radio?

  2. What were special semaphore flags used for?

  3. Who proofed the existence of electromagnetic radiation?

  4. Where was the first radio equipment used?

  5. Who was the first to introduce a successful system using long wave signals?

Exercise 3. Match the left part with the right:

1. Beginning in the mid-1800s,

1. there were thousands of three- and four- flag groupings.

2. Over time an extensive vocabulary of signals was created,

2. an international convention was developed using special semaphore flags to exchange messages between merchant ships.

3. And in addition to the two-flag signals,

3. before practical microwave transmissions were developed.

4. Although it would turn out to take decades

4. even as the expansion of radio was beginning to make visual signaling obsolete.

Exercise 4. Open brackets choosing the right words:

In the 1872 edition of the annual Journal of the Society of Telegraph Engineers (reviewed/informed) the confusion and limitations (often/rare) encountered, (prior/after) to the invention of radio, by ships (trying/tried) communicate during emergencies, while (suggesting/suggested) that the "immediate object for the Telegraph Engineer... (should/would) be devising means for communicating at night, and (in/on) fog".

The Speaking Module

II. Speaking Exercises:

Exercise 1. Describe these words: (line-of-sight, lightship, rays ) using the suggested words and expressions as in example:

analogue signal

is varied; with respect to; transmission; degraded by noise

example:

In an analogue signal, the signal is varied continuously with respect to the information. During transmission the information contained in analogue signals will be degraded by noise.

line-of-sight

maritime communication, visual signaling, clear weather, only, limited ranges

lightship

advanced suggestion, microwave beams, problem of fog, shore communication

rays

powerful beam, unabsorbed by fog; looking into, incomparable advantage

Exercise 2. Ask questions to the given answers:

1) Question: ___________________________________________ ?

Answer: Prior to the introduction of radio, maritime communication was generally limited to line-of-sight visual signaling.

2) Question: ___________________________________________ ?

Answer: However, to this day NC continues to be an international distress signal when using flag signaling.

3) Question: ___________________________________________ ?

Answer: There is little doubt that a powerful beam of this sort would, unlike light, be unabsorbed by fog.