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Army Radio Communication in the Great War Keith R Thrower, OBE
Army radio communication in the Great War Keith R Thrower, OBE Introduction Prior to the outbreak of WW1 in August 1914 many of the techniques to be used in later years for radio communications had already been invented, although most were still at an early stage of practical application. Radio transmitters at that time were predominantly using spark discharge from a high voltage induction coil, which created a series of damped oscillations in an associated tuned circuit at the rate of the spark discharge. The transmitted signal was noisy and rich in harmonics and spread widely over the radio spectrum. The ideal transmission was a continuous wave (CW) and there were three methods for producing this: 1. From an HF alternator, the practical design of which was made by the US General Electric engineer Ernst Alexanderson, initially based on a specification by Reginald Fessenden. These alternators were primarily intended for high-power, long-wave transmission and not suitable for use on the battlefield. 2. Arc generator, the practical form of which was invented by Valdemar Poulsen in 1902. Again the transmitters were high power and not suitable for battlefield use. 3. Valve oscillator, which was invented by the German engineer, Alexander Meissner, and patented in April 1913. Several important circuits using valves had been produced by 1914. These include: (a) the heterodyne, an oscillator circuit used to mix with an incoming continuous wave signal and beat it down to an audible note; (b) the detector, to extract the audio signal from the high frequency carrier; (c) the amplifier, both for the incoming high frequency signal and the detected audio or the beat signal from the heterodyne receiver; (d) regenerative feedback from the output of the detector or RF amplifier to its input, which had the effect of sharpening the tuning and increasing the amplification. -
Wireless Telegraphy and Radio Wireless Information Network and National Broadcast System
Wireless Telegraphy and Radio Wireless Information Network and National Broadcast System CEE 102: Prof. Michael G. Littman Course Administrator: Hiba Abdel-Jaber [email protected] Computers allowed for NOTETAKING ONLY Please - NO Cell Phones, Texting, Internet use 1 Consumer Goods 1900 - 1980 Economics and Politics 2 Consumer Goods 1900 - 1980 RMS Titanic with Marconi Antenna Economics and Politics 3 Marconi - Wireless messages at sea RMS Titanic with Marconi Antenna 4 transmitter receiver Marconi - Wireless messages at sea Heinrich Hertz’s Experiment - 1888 § Spark in transmitter initiates radio burst § Spark in receiver ring detects radio burst 5 transmitter receiver DEMO Marconi - Wireless messages at sea Heinrich Hertz’s Experiment - 1888 § Spark in transmitter initiates radio burst § Spark in receiver ring detects radio burst 6 transmitter receiver Heinrich Hertz’s Experiment - 1888 § Spark in transmitter initiates radio burst § Spark in receiver ring detects radio burst 7 Electromagnetic Wave wave-speed frequency wavelength Time or Length 8 Electromagnetic Wave wave-speed frequency Wireless Telegraph Hertz Discovery wavelength Marconi Patents Marconi Demonstrations Time or Length 9 Marconi’s Wireless Telegraph Wireless Telegraph Hertz Discovery Marconi Patents Marconi Demonstrations 10 Marconi’s Wireless Telegraph Wireless Telegraph Hertz Discovery DEMO Marconi Patents Marconi Demonstrations 11 Marconi’s Wireless Telegraph 12 13 Marconi’s Patent for Tuning coherer 14 Tuning Circuit Marconi’s Patent for Tuning L C coherer 1 1 ν = 2π LC 15 Transmitting antenna Marconi’s Patent for Tuning coherer Cornwall (England) 16 KITE Receiving antenna Transmitting antenna Saint John’s (Newfoundland) Cornwall (England) …..dot……….……dot……......…….dot…... December 12, 1901 17 KITE Receiving antenna Saint John’s (Newfoundland) Marconi gets Nobel Prize in 1909 …..dot……….……dot……......…….dot….. -
The Last Days of Night
FEATURE CLE: THE LAST DAYS OF NIGHT CLE Credit: 1.0 Thursday, June 14, 2018 1:25 p.m. - 2:25 p.m. Heritage East and Center Lexington Convention Center Lexington, Kentucky A NOTE CONCERNING THE PROGRAM MATERIALS The materials included in this Kentucky Bar Association Continuing Legal Education handbook are intended to provide current and accurate information about the subject matter covered. No representation or warranty is made concerning the application of the legal or other principles discussed by the instructors to any specific fact situation, nor is any prediction made concerning how any particular judge or jury will interpret or apply such principles. The proper interpretation or application of the principles discussed is a matter for the considered judgment of the individual legal practitioner. The faculty and staff of this Kentucky Bar Association CLE program disclaim liability therefore. Attorneys using these materials, or information otherwise conveyed during the program, in dealing with a specific legal matter have a duty to research original and current sources of authority. Printed by: Evolution Creative Solutions 7107 Shona Drive Cincinnati, Ohio 45237 Kentucky Bar Association TABLE OF CONTENTS The Presenter .................................................................................................................. i The War of the Currents: Examining the History Behind The Last Days of Night .................................................................................................... 1 AC/DC: The Two Currents -
Reginald Fessenden Challenge 2021
T H E R E G I N A L D F E S S E N D E N C H A L L E N G E 13 & 14 J U L Y2021 IN SUPPORT OF INASSOCIATIONWITH IN ASSOCIATION WITH THE REGINALD FESSENDEN CHALLENGE The rega�a is a fantas�c opportunity to network with industry peers, promote your brandamongst a relevant audience, enjoy a team building ac�vity and have a fun day, sailing in the UK's premier sailing area, the Solent. Whether you choose to bring a team from head office, or cap�vate key clients or business partners, a day on a yacht is an unrivalled way to build stronger working rela�onships.Combine that with networking drinks and dinner at the nearby Royal Southern Yacht Club - and the result is an exci�ng and produc�ve event! You and your invited team will sail together on a premium sailing yacht, under the guidance of a professional skipper - so don't worry, no previous sailing experience is required. OUR YACHTS Our Beneteau Oceanis 37’s are ideal for novice sailors and competent racers alike. As well as a superb sailing experience, these yachts are ideal for corporate hospitality, with an unclu�ered deck layout, spacious cockpit and plenty of room for crew to move about both above and below deck. Our professional skippers will give you a full safety brief and take you through the basics before you go out to sea, and con�nue training so no sailing experience is necessary. BENETEAU OCEANIS BENETEAU OCEANIS 37 37 INSIDE LAYOUT OUTSIDE LAYOUT THE CHARITY - The Not Forgotten The Not Forgo�en is a unique na�onal Tri-Service charity which provides entertainment, leisure and recrea�on for the serving wounded, injured or sick and for ex-service men and women with disabili�es. -
Reginald Aubrey Fessenden (1866 – 1932)
Reginald Aubrey Fessenden (1866 – 1932) By Brian Smith As I approach middle age, I marvel at how little Canadian history was taught to us during our school years. Apparently, we missed a fair amount. Recent events, such as the controversy over changing the name of Mount Logan (for William Edmond Logan – surveyor / geologist) to Mount Trudeau and the CBC series, “Canada, A People’s History”, have begun to open the eyes of Canadians to our important and honoured past. Canadians have contributed a great deal to the events of the world. And that includes the ‘Father of Radio Broadcasting’, Canadian Reginald Fessenden. Reginald Fessenden was born in East Bolton, Quebec on October 6, 1866. He was the eldest son of Anglican Reverend Elisha and Clementina Fessenden (who are buried in Ancaster, Ontario, where a school still bears the family name). He spent his early boyhood in Fergus and Niagara Falls, Ontario. Reginald Fessenden developed a keen interest in mathematics far beyond his years, which led him, at the age of 14, to a mathematics mastership at Bishop’s College in Lennoxville, Quebec. At 18, he accepted a teaching position that took him to Bermuda where he met and married his wife, Helen, with whom he would spend the next 40 years and have only one child, a son. Fessenden had a keen interest in the work of Thomas Alva Edison. So much so that he left Bermuda at the age of 20 to seek employment at Thomas Edison’s machine shop in New York. He was hired as an instrument tester, without even meeting Edison, but so impressed Edison’s staff, that he was promoted to work in the labs and eventually became chief chemist; all before the age of 24. -
Television, Farnsworth and Sarnoff
by AARON SORKIN directed by NICK BOWLING STUDY GUIDE prepared by Maren Robinson, Dramaturg This Study Guide for The Farnsworth Invention was prepared by Maren Robinson and edited by Lara Goetsch for TimeLine Theatre, its patrons and educational outreach. Please request permission to use these materials for any subsequent production. © TimeLine Theatre 2010 — — STUDY GUIDE — Table of Contents The Playwright: Aaron Sorkin .................................................................................... 3 The History: Sorkin’s Artistic License ........................................................................ 3 The People: Philo T. Farnsworth ................................................................................. 4 The People: David Sarnoff ........................................................................................... 6 The People: Other Players ........................................................................................... 8 Television: The Business ........................................................................................... 14 The Radio Corporation of America Patent Pool ................................................ 14 Other Players in Early Radio and Television ................................................... 16 Television: The Science .............................................................................................. 16 Timeline of Selected Events: Television, Farnsworth and Sarnoff .......................... 20 Television by the Numbers ....................................................................................... -
A Short History of Radio
Winter 2003-2004 AA ShortShort HistoryHistory ofof RadioRadio With an Inside Focus on Mobile Radio PIONEERS OF RADIO If success has many fathers, then radio • Edwin Armstrong—this WWI Army officer, Columbia is one of the world’s greatest University engineering professor, and creator of FM radio successes. Perhaps one simple way to sort out this invented the regenerative circuit, the first amplifying re- multiple parentage is to place those who have been ceiver and reliable continuous-wave transmitter; and the given credit for “fathering” superheterodyne circuit, a means of receiving, converting radio into groups. and amplifying weak, high-frequency electromagnetic waves. His inventions are considered by many to provide the foundation for cellular The Scientists: phones. • Henirich Hertz—this Clockwise from German physicist, who died of blood poisoning at bottom-Ernst age 37, was the first to Alexanderson prove that you could (1878-1975), transmit and receive Reginald Fessin- electric waves wirelessly. den (1866-1932), Although Hertz originally Heinrich Hertz thought his work had no (1857-1894), practical use, today it is Edwin Armstrong recognized as the fundamental (1890-1954), Lee building block of radio and every DeForest (1873- frequency measurement is named 1961), and Nikola after him (the Hertz). Tesla (1856-1943). • Nikola Tesla—was a Serbian- Center color American inventor who discovered photo is Gug- the basis for most alternating-current lielmo Marconi machinery. In 1884, a year after (1874-1937). coming to the United States he sold The Businessmen: the patent rights for his system of alternating- current dynamos, transformers, and motors to George • Guglielmo Marconi—this Italian crea- Westinghouse. -
IEEE Sweden MN2020-Q2
IEEE SE MN2020-Q2 avenue of increasing our gains of membership to membership in all members of IEEE Sweden Individual Highlights: Editorial chapters. IEEE tools Section. The board online are readily made remains grateful to The challenges available to us to remain committed members. We created by coronavirus R8SYP UPDATE 2 efficient, creative, shall not relent in pandemic have been industrious and informed. supporting and motivating enormous. Nonetheless, IEEE The pandemic’s you to reach the pinnacle IEEE’s response to Sweden section is COVID19 3 unprecedented of your set aside goals. determined to continue to circumstances afforded This Newsletter is subject make impact for the 2020 many of us opportunities to nonstop improvements Chapters Summary fiscal year. It is a trying time in eHealth. My recent and aims at sharing Activities 3 for the usual physical published paper titled information with IEEE Young Professionals 3 appearances in conferences “COVID-19 Patient Health members. Hence, we and meetings, but created Prediction Using Boosted kindly ask for increase awareness of Membership statistics in Random Forest contributions, feedback Sweden 4 virtual meetings which we Algorithm” is available and involvement from our are determined to explore online that supports IEEE readers. Please submit to and utilize in full. I Action for Industry 4 stand point on Covid-19. the Newsletter Editor, Dr. personally continue to see We shall continue to Celestine Iwendi this challenge as a strong deliver as entrusted the [email protected] Alexanderson Day 5 A message from the Sweden Section Chair Sites for Success 7 Dear IEEE Member, planned events and technology that enables us conferences such as the to connect and deliver in ISCMI20; that was to be held the current situation. -
ABSTRACT AWA Review Wireless Comes of Age on the West Coast1
Lee AWA Review Wireless Comes of Age on the West Coast1 !2011 Bartholomew Lee ABSTRACT This is a story primarily about young men and what they accomplished in a remarkable Radio as we know it time, the fi rst two decades of the 20th Century, had many fathers. Cali- and in remarkable places – especially in Cali- fornia enjoyed unique fornia in the Western United States. Guglielmo circumstances that gave (William) Marconi, in his early twenties, elec- rise to independent de- trifi ed the technical world of the late 19th Cen- velopment. Young men tury with his successes using Hertzian electro- explored and advanced magnetic waves to communicate at distance, devices and means of what we now call “radio.” He did this without communication as soon the wired connections to which the world had as they read about ear- turned with enthusiasm earlier in the century. lier advances, especially The telegraph, including undersea cables, and Marconi’s use of wireless the telephone, needed wire, and lots of it. Com- spark systems. The arc munication without such wires, at fi rst wireless as a generator of high telegraphy, opened new vistas. This was par- power continuous wave ticularly so looking out to the world’s oceans. energy for communica- Communication with ships at sea (Marconi’s tions came to California primary initial interest) was now possible. Then, and then the world. Doc a challenge to the expensive cable monopolies Herrold began the fi rst could be mounted. This was so because the new regular broadcasting to a “wireless” meant exactly that: no expensive, known audience around capital-intensive investments in cables, only 1912 in California, using in terminal stations. -
Groping in the Dark : an Early History of WHAS Radio
University of Louisville ThinkIR: The University of Louisville's Institutional Repository Electronic Theses and Dissertations 5-2012 Groping in the dark : an early history of WHAS radio. William A. Cummings 1982- University of Louisville Follow this and additional works at: https://ir.library.louisville.edu/etd Recommended Citation Cummings, William A. 1982-, "Groping in the dark : an early history of WHAS radio." (2012). Electronic Theses and Dissertations. Paper 298. https://doi.org/10.18297/etd/298 This Master's Thesis is brought to you for free and open access by ThinkIR: The University of Louisville's Institutional Repository. It has been accepted for inclusion in Electronic Theses and Dissertations by an authorized administrator of ThinkIR: The University of Louisville's Institutional Repository. This title appears here courtesy of the author, who has retained all other copyrights. For more information, please contact [email protected]. GROPING IN THE DARK: AN EARLY HISTORY OF WHAS RADIO By William A. Cummings B.A. University of Louisville, 2007 A Thesis Submitted to the Faculty of the College of Arts and Sciences of the University of Louisville in Partial Fulfillment of the Requirements for the Degree of Master of Arts Department of History University of Louisville Louisville, Kentucky May 2012 Copyright 2012 by William A. Cummings All Rights Reserved GROPING IN THE DARK: AN EARLY HISTORY OF WHAS RADIO By William A. Cummings B.A., University of Louisville, 2007 A Thesis Approved on April 5, 2012 by the following Thesis Committee: Thomas C. Mackey, Thesis Director Christine Ehrick Kyle Barnett ii DEDICATION This thesis is dedicated to the memory of my grandfather, Horace Nobles. -
1. MDI Combroad Fm 3Pp.Indd
COMMUNICATIONS AND BROADCASTING Milestones in Discovery and Invention COMMUNICATIONS AND BROADCASTING REVISED EDITION FROM WIRED WORDS TO WIRELESS WEB uHarry Henderson COMMUNICATIONS AND BROADCASTING: From Wired Words to Wireless Web, Revised Edition Copyright © 2007, 1997 by Harry Henderson All rights reserved. No part of this book may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, record- ing, or by any information storage or retrieval systems, without permission in writing from the publisher. For information contact: Chelsea House An imprint of Infobase Publishing 132 West 31st Street New York NY 10001 Library of Congress Cataloging-in-Publication Data Henderson, Harry. Communications and broadcasting : from wired words to wireless Web / Harry Henderson.—Rev. ed. p. cm. Includes bibliographical references and index. ISBN 0-8160-5748-6 1. Telecommunication—History—Juvenile literature. I. Title. TK5102.4.H46 2006 384—dc22 2006005577 Chelsea House books are available at special discounts when purchased in bulk quantities for businesses, associations, institutions, or sales promotions. Please call our Special Sales Department in New York at (212) 967-8800 or (800) 322-8755. You can find Chelsea House on the World Wide Web at http://www.chelseahouse.com Text design by James Scotto-Lavino Cover design by Dorothy M. Preston Illustrations by Sholto Ainslie and Melissa Ericksen Printed in the United States of America MP FOF 10 9 8 7 6 5 4 3 2 1 This book is printed on acid-free paper. -
Eafrectv-O' L.D Ilan
eafrectv-o' L.dCod iLan, Joi. ï?AlilU'J lJ rrl -Alï,tl'r1arAY Bill Katz Radio Group www.americanradiohistory.com . r I www.americanradiohistory.com RADIO'S 75TH Elvis to Big Bands to revive it, and ended up with Rush Limbaugh and Talk Radio, PUBLISHER'S NOTES perhaps the most significant milestone in Radio in decades. When times got tough we invented automation and later, satel- lite delivery. We became the darlings of Wall Street and watched as fools overpaid Ratlio Relui for our properties, waiting to see who would be left with the joker. We saw many fall. We regrouped, learned our from a new station in Miami, Florida. lesson, and came out stronger than ever. "Can you be here in three days?" the PD Radio is powerful. With words and asked. Needless to say, I packed my music, it affects listeners lives, sets music Volkswagen and headed south for an trends, sells millions of books and CDs opportunity of a lifetime. I was 17 and and influences elections. Talk Radio has the station was Y -100. We debuted Au- become the en vogue place to go for out - gust 3, I973 and I was part of the lineup. of -work politicians who know the strength Our first order of business was to give of its voice. And yet there are those among away the first $50,000 jackpot in Radio. us who either don't understand the depth There are a thousand stories just like of Radio's influence or choose to ignore it. mine. Others were on the air by age 13 Though we may consider some of these and I 4.