Radio receivers. A radio receiver is the opposite of a radio transmitter. It uses an antenna to capture radio waves, processes those waves to extract only those waves that are vibrating at the desired frequency, extracts the audio signals that were added to those waves, amplifies the audio signals, and finally plays them on a speaker. Boys first book of radio and electronics. Books For Boys, I Love Books, Vacuum Tube, File Format, Electronic Books, Book Quotes, Specs. Vacuum Tubes,Tube Radio Specs and Amps. Zenith Chairside Radio-Phonograph Model L846E (USA 1954) WANT.

There are many natural sources of radio waves. But in the later part of the 19th century, scientists figured out how to electronically generate radio waves using electric currents. Two components are required for radio communication: a transmitter and a receiver.

Radio transmitters

A radio transmitter consists of several elements that work together to generate radio waves that contain useful information such as audio, video, or digital data.

• Power supply: Provides the necessary electrical power to operate the transmitter.

• Oscillator: Creates alternating current at the frequency on which the transmitter will transmit. The oscillator usually generates a sine wave, which is referred to as a carrier wave.

• Modulator: Adds useful information to the carrier wave. There are two main ways to add this information. The first, called amplitude modulation or AM, makes slight increases or decreases to the intensity of the carrier wave. The second, called frequency modulation or FM, makes slight increases or decreases the frequency of the carrier wave.

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• Amplifier: Amplifies the modulated carrier wave to increase its power. The more powerful the amplifier, the more powerful the broadcast.

• Antenna: Converts the amplified signal to radio waves.

Radio receivers

A radio receiver is the opposite of a radio transmitter. It uses an antenna to capture radio waves, processes those waves to extract only those waves that are vibrating at the desired frequency, extracts the audio signals that were added to those waves, amplifies the audio signals, and finally plays them on a speaker.

• Antenna: Captures the radio waves. Typically, the antenna is simply a length of wire. When this wire is exposed to radio waves, the waves induce a very small alternating current in the antenna.

• RF amplifier: A sensitive amplifier that amplifies the very weak radio frequency (RF) signal from the antenna so that the signal can be processed by the tuner.

• Tuner: A circuit that can extract signals of a particular frequency from a mix of signals of different frequencies. On its own, the antenna captures radio waves of all frequencies and sends them to the RF amplifier, which dutifully amplifies them all.

  Unless you want to listen to every radio channel at the same time, you need a circuit that can pick out just the signals for the channel you want to hear. That’s the role of the tuner.

  The tuner usually employs the combination of an inductor (for example, a coil) and a capacitor to form a circuit that resonates at a particular frequency. This frequency, called the resonant frequency, is determined by the values chosen for the coil and the capacitor. This type of circuit tends to block any AC signals at a frequency above or below the resonant frequency.

  You can adjust the resonant frequency by varying the amount of inductance in the coil or the capacitance of the capacitor. In simple radio receiver circuits, the tuning is adjusted by varying the number of turns of wire in the coil. More sophisticated tuners use a variable capacitor (also called a tuning capacitor) to vary the frequency.

• Detector: Responsible for separating the audio information from the carrier wave. For AM signals, this can be done with a diode that just rectifies the alternating current signal. What’s left after the diode has its way with the alternating current signal is a direct current signal that can be fed to an audio amplifier circuit. For FM signals, the detector circuit is a little more complicated.

• Audio amplifier: This component’s job is to amplify the weak signal that comes from the detector so that it can be heard. This can be done using a simple transistor amplifier circuit.

Of course, there are many variations on this basic radio receiver design. Many receivers include additional filtering and tuning circuits to better lock on to the intended frequency — or to produce better-quality audio output — and exclude other signals. Still, these basic elements are found in most receiver circuits.

Alfred Powell 'Skipper' Morgan (1889–1972), of Upper Montclair, New Jersey was an electrical engineer, an inventor with patents on radio and mechanical devices, and an author of technical and children's books. He had four sons, which is the reason why his books were originally written for boys. The 1970s editions were for boys and girls.

Alfred Morgan's contributions to electronics[edit]

Alfred Morgan made many valuable contributions to developments in the field of radio and electronics. He attended the Massachusetts Institute of Technology and was a radio manufacturer for a number of years. His most notable books were a series of juvenile books about Radio and Electronics. This series included the Boys First, Second, Third & Fourth Book Of Radio And Electronics.

Adams Morgan Company[edit]

Alfred P. Morgan was a partner in the electronics business. The company was Adams Morgan. Adams Morgan was created about 1910 for distributing radio construction kits. Paul Forman Godley, the developer of the Paragon Receivers, was added in 1915 as the third. The company employed 50-100 employees/workers in 1922/23. After economic problems, production was stopped at the end of 1927.

Publications[edit]

Drawing on a lifetime of experience, Morgan produced many books on radio and electronics. Although some of the projects described in his books cannot be built easily today because the parts are difficult to find, many are based on simple parts and hand tools that one can find at a hardware or electronic supply store. Safety standards have also improved in the last hundred years, so one needs common sense when deciding to carry out projects he described. A few books are available in reprints including The Boy Electrician (Lindsay Publications).

Morgan also edited a monthly column on electricity and mechanics in The Boys' Magazine.

Partial List of Publications[edit]

Chemistry

Adventures in Electrochemistry / Author: Morgan, Alfred Powell, Publisher: New York: Scribner, Date: c1977.

First Chemistry Book for Boys and Girls / Author: Morgan, Alfred Powell, Publisher: New York, Scribner, Date: [1950]

First Chemistry Book for Boys and Girls / Author: Morgan, Alfred Powell, Publisher: New York, Scribner, Date: [1962]

First Chemistry Book for Boys and Girls / Author: Morgan, Alfred Powell, Publisher: New York, Scribner, Date: c1977.

Simple Chemical Experiments / Author: Morgan, Alfred Powell, Publisher: D. Appleton-Century, Date: [1941]

Electronics

15 part series published in Popular Electricity Magazine 1910-1911. Series Title: 'A High-Power Wireless Equipment' by Alfred P. Morgan Ref: ISBN0-917914-95-3 1988

WIRELESS TELEGRAPH CONSTRUCTION FOR AMATEURS by Alfred Powell Morgan, Third Edition, D. Van Nostrand Company, NY 1914[1]

Wireless Construction and Installation for Beginners by A. P. Morgan, Second Edition, Cole & Morgan, New York, NY 1916 (Art and Sciences - No. Ram ram sankat mochan mahabali hanuman mp3. 5)

The Boy Electrician by Alfred P. Morgan (1913 copyright)The Boy Electrician is an introduction to electricity and magnetism from a time when you could still build things at home that worked just like commercial gear. The fundamentals haven't changed in all this time, and the experiments and diagrams can be understood by anyone.[2] This book was originally reviewed tongue-in-cheek as 'a menance to the business of neighbourhood electrician, for it strives to teach the average boy all sorts of things his mother would like to have done about the house.'^[1]

A First Electrical Book for Boys; Author: Morgan, Alfred Powell, Publisher: New York, Scribner Date: [1951]

A First Electrical Book for Boys. Author: Morgan, Alfred Powell, Publisher: New York, Scribner Date: c1963

First Book of Radio and Electronics / Author: Morgan, Alfred Powell, Publisher: New York : Scribner, Date: c1977.

The Boy Electrician; Author: Morgan, Alfred Powell, Publisher: New York, Lothrop, Lee & Shepard Co. Date: [1948]

The Boys' First Book of Radio and Electronics. Author: Morgan, Alfred Powell, Publisher: New York, Scribner Date: [1954]

The Boys' Second Book of Radio and Electronics. Author: Morgan, Alfred Powell, Publisher: New York, Scribner Date: [1957]

The Boy's Third Book of Radio and Electronics. Author: Morgan, Alfred Powell, Publisher: New York, Scribner Date: [1962]

The Boys' Fourth Book of Radio and Electronics; an introduction to solid state physics, semiconductors, and transistors, Author: Morgan, Alfred Powell. Publisher: New York, Scribner Date: [1969]

The pageant of Electricity Author: Morgan, Alfred Powell, Publisher: New York, London d. Appleton-Century company, incorporated Date: 1939

Things a Boy Can Do with Electricity, Author: Morgan, Alfred Powell, Publisher: New York, C. Scribner's sons; London, Date: C. Scribner's sons, ltd., 1938.

Getting Acquainted with Electricity, Author: Morgan, Alfred Powell, Publisher: New York London, D. Appleton-Century company, incorporated. Date: [c1942]

Pets

An Aquarium Book for Boys and Girls, Author: Morgan, Alfred Powell, Publisher: New York, C. Scribner's Sons; London, C. Scribner's Sons, ltd., Date: 1936.

A pet book for boys and girls, Author: Morgan, Alfred Powell, Publisher: New York, C. Scribner's, Date: 1949.

A Pet Book for Boys and Girls / Author: Morgan, Alfred Powell, Publisher: New York: Charles Scribner's, Date: 1951.

Tropical Fishes and Home Aquaria : a practical guide to a fascinating hobby / Author: Morgan, Alfred Powell, Publisher: New York : C. Scribner, Date: 1953, c1935.

Tools / Misc

Boy's Book of Engines, Motors and Turbines. Author: Morgan, Alfred Powell. Publisher: Scribner, Date: 1946

Boys' Book of Science and Construction; Author: Morgan, Alfred Powell, Publisher: New York, Lothrop, Lee & Shepard Co. Date: [1948]

How to Build a 20-foot Bi-plane Glider; a practical handbook on the construction of a bi-plane gliding machine. Author: Morgan, Alfred Powell, Publisher: New York, Spon & Chamberlain; [etc., etc.] Date: 1909.

The Boys' Book of Engines, Motors & Turbines / by Alfred Morgan ; illustrated by the author. Author: Morgan, Alfred Powell, 1889-1972. Publisher: New York : Charles Scribner Sons, 1946.

Tools and How to Use Them for Woodworking and Metal Working/ Author: Morgan, Alfred Powell, Publisher: New York : Grosset & Dunlap, Date: 1948.

How to Use Tools. Author: Morgan, Alfred Powell, Publisher: New York, Arco, Date: [1955]

Advertisements for Morgan's Books[edit]

It was very popular for publishers in the early 20th century to include advertisements of other books in the last few pages of their publications. Here are a few references to Morgan's books.

GLOSSARY OF AVIATION TERMS, 1917 Advertisement for;WIRELESS TELEGRAPHY AND TELEPHONY SIMPLY EXPLAINED. By ALFRED P. MORGAN. Thisis undoubtedly one of the most complete and comprehensible treatises on the subject ever pubhshed and a close study of its pages will enable one to master all the details of the wireless transmission of messages. The author has filled a long felt want and has succeeded in furnishing a lucid,comprehensible explanation in simple language of the theory and practice of wireless telegraphy and telephony 154 pages 156 engravings. Price $1.00

US Patents[edit]

58,808 DESIGN FOR AN INSTRUMENT-MOUNT FOR RADIOPANEL Aug. 30, 1921[3]

60,362 DESIGN FOR AN INSTRUMENT-MOUNT FOR RADIO PANEL Feb. 07, 1922[4]

1,459,070 RHEOSTAT June 19, 1923[5]

See also[edit]

References[edit]

1. ^'The boy electrician'. The Independent. Dec 14, 1914. Retrieved July 24, 2012.

External links[edit]