7. Describe the work of a radio receiver or describe the principle of the resonance.

8. Translate into English.

1. Радіоприймач використовується для того, щоб відокремити радіохвилі від усіх інших різновидів електромагнітних хвиль.

2. Для чого ще можна використовувати радіоприймач.

3. Антена приймача ловить хвилю носія із заниженою частотою і направляє її у ланцюг, налаштований відбивати звук, що має хвилю носія.

4. Електролампи можуть використовуватися не лише у ролі посилювача.

5. У наш час у процесі вирівнювання широко використовуються транзистори і напівпровідникові діоди.

TEXT B

1. Read and translate the text in a written form: Receivers

A radio receiver is an electronic circuit that receives its input from an antenna, uses electronic filters to separate a wanted radio signal from all other signals picked up by this antenna, amplifies it to a level suitable for further processing, and finally converts through demodulation and decoding the signal into a form usable for the consumer, such as sound, pictures, digital data, measurement values, navigational positions, etc.

In the context of home audio systems, the term "receiver" often refers to a combination of a tuner, a preamplifier, and a power amplifier all on the same chassis. Audiophiles will refer to such a device as an integrated receiver, while a single chassis that implements only one of the three component functions is called a discrete component. Some audio purists still prefer three discreet units - tuner, preamplifier and power amplifier - but the integrated receiver has, for some years, been the mainstream choice for music listening. The first integrated stereo receiver was made by the Harman Kardon company, and came onto the market in 1958. It had undistinguished performance, but it represented a breakthrough to the "all in one" concept of a receiver, and rapidly improving designs gradually made the receiver the mainstay of the marketplace. Many radio receivers also include a loudspeaker.

While James Clerk Maxwell was the first person to prove electromagnetic waves existed, a German named Heinrich Hertz demonstrated these new waves by using spark gap equipment to transmit and receive radio or "Hertzian waves", as they were first called.

The world’s first radio receiver (thunderstorm register) was designed by Alexander Stepanovich Popov, and it was first seen at the All-Russia exhibition 1896. He was the first to demonstrate the practical application of electromagnetic (radio) waves, although he did not care to apply for a patent for his invention.

A device called a coherer became the basis for receiving radio signals. The first person to use the device to detect radio waves was a Frenchman named Edouard Branly, and Oliver Lodge popularised it when he gave a lecture in 1898 in honour of Hertz. Lodge also made improvements to the coherer. Guglielmo Marconi believed that these new waves could be used to communicate over great distances and made significant improvements to both radio receiving and transmitting apparatus. In 1895 Marconi demonstrated the first viable radio system, leading to transatlantic radio communication in December 1901.

2. Make up a plan of the text in the form of questions.

TEXT C

1. Mind the following words:

high fidelity – висока точність

geosynchronous orbit – гео синхронна орбіта

telemetry – телеметрія

2. Listen to the text and try to understand it.

3. Answer the following questions:

1. What receivers are used for home stereo listeners?

2. What are communication receivers used as?

3. What receives television programming from communication satellites?

4. What is the function of telemetry receivers?

5. What do measuring receivers do?

UNIT12

TEXT A

Television

1.Read and memorize the following words and word-combinations and their translations.