DOCSLIB.ORG

22 Radio Receiver Projects for the Evil Genius Evil Genius Series

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
22 Radio Receiver Projects for the Evil Genius Evil Genius Series 22 Radio Receiver Projects for the Evil Genius Evil Genius Series Bionics for the Evil Genius: 25 Build-it-Yourself Projects Electronic Circuits for the Evil Genius: 57 Lessons with Projects Electronic Gadgets for the Evil Genius: 28 Build-it-Yourself Projects Electronic Games for the Evil Genius Electronic Sensors for the Evil Genius: 54 Electrifying Projects 50 Awesome Auto Projects for the Evil Genius 50 Model Rocket Projects for the Evil Genius Mechatronics for the Evil Genius: 25 Build-it-Yourself Projects MORE Electronic Gadgets for the Evil Genius: 40 NEW Build-it-Yourself Projects 101 Spy Gadgets for the Evil Genius 123 PIC® Microcontroller Experiments for the Evil Genius 123 Robotics Experiments for the Evil Genius PC Mods for the Evil Genius Solar Energy Projects for the Evil Genius 25 Home Automation Projects for the Evil Genius 51 High-Tech Practical Jokes for the Evil Genius 22 Radio Receiver Projects for the Evil Genius TOM PETRUZZELLIS New York Chicago San Francisco Lisbon London Madrid Mexico City Milan New Delhi San Juan Seoul Singapore Sydney Toronto Copyright © 2008 by The McGraw-Hill Companies, Inc. All rights reserved. Manufactured in the United States of America. Except as permitted under the United States Copyright Act of 1976, no part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher. 0-07-159475-2 The material in this eBook also appears in the print version of this title: 0-07-148929-0. All trademarks are trademarks of their respective owners. Rather than put a trademark symbol after every occurrence of a trademarked name, we use names in an editorial fashion only, and to the benefit of the trademark owner, with no intention of infringement of the trademark. Where such desig- nations appear in this book, they have been printed with initial caps. McGraw-Hill eBooks are available at special quantity discounts to use as premiums and sales promotions, or for use in corporate training programs. For more information, please contact George Hoare, Special Sales, at [email protected] or (212) 904-4069. TERMS OF USE This is a copyrighted work and The McGraw-Hill Companies, Inc. (“McGraw-Hill”) and its licensors reserve all rights in and to the work. Use of this work is subject to these terms. Except as permitted under the Copyright Act of 1976 and the right to store and retrieve one copy of the work, you may not decompile, disassemble, reverse engineer, reproduce, modify, create derivative works based upon, transmit, distribute, disseminate, sell, publish or sublicense the work or any part of it without McGraw-Hill’s prior consent. You may use the work for your own noncommercial and personal use; any other use of the work is strictly prohibited. Your right to use the work may be terminated if you fail to comply with these terms. THE WORK IS PROVIDED “AS IS.” McGRAW-HILL AND ITS LICENSORS MAKE NO GUARANTEES OR WARRANTIES AS TO THE ACCURACY, ADEQUACY OR COMPLETENESS OF OR RESULTS TO BE OBTAINED FROM USING THE WORK, INCLUDING ANY INFORMATION THAT CAN BE ACCESSED THROUGH THE WORK VIA HYPERLINK OR OTHERWISE, AND EXPRESSLY DISCLAIM ANY WARRANTY, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. McGraw-Hill and its licensors do not warrant or guarantee that the functions contained in the work will meet your requirements or that its operation will be uninterrupted or error free. Neither McGraw-Hill nor its licensors shall be liable to you or anyone else for any inaccuracy, error or omission, regardless of cause, in the work or for any damages resulting therefrom. McGraw-Hill has no responsibility for the content of any information accessed through the work. Under no circumstances shall McGraw-Hill and/or its licensors be liable for any indirect, incidental, special, punitive, consequential or similar damages that result from the use of or inability to use the work, even if any of them has been advised of the possibility of such damages. This limitation of liability shall apply to any claim or cause whatsoever whether such claim or cause arises in contract, tort or otherwise. DOI: 10.1036/0071489290 About the Author About the Author Thomas Petruzzellis is an electronics engineer including an earlier volume in this series, currently working at the geophysical laboratory at Electronic Sensors for the Evil Genius. He is also the State University of New York, Binghamton. the author of Create Your Own Electronics Also an instructor at Binghamton, with 30 years’ Workshop; STAMP 2 Communications and Control experience in electronics, he is a veteran author Projects; Optoelectronics, Fiber Optics, and Laser who has written extensively for industry Cookbook; Alarm, Sensor, and Security Circuit publications, including Electronics Now, Modern Cookbook, all from McGraw-Hill. He lives in Electronics, QST, Microcomputer Journal, and Vestal, New York. Nuts & Volts. Tom wrote five previous books, Copyright © 2008 by The McGraw-Hill Companies, Inc. Click here for terms of use. This page intentionally left blank Acknowledgments Acknowledgments I would like to thank the following people and Charles Higgins/Tennessee State University companies listed below for their help in making Fat Quarters Software this book possible. I would also like to thank Radio-Sky Publishing senior editor Judy Bass and all the folks at McGraw-Hill publications who had a part in Ramsey Electronics making this book possible. We hope the book will Vectronics, Inc inspire both radio and electronics enthusiasts to Russell Clift build and enjoy the radio projects in this book. Todd Gale Eric Vogel Richard Flagg/RF Associates Wes Greenman/University of Florida Copyright © 2008 by The McGraw-Hill Companies, Inc. Click here for terms of use. This page intentionally left blank For more information about this title, click here Project 10 Experiments Contents Acknowledgments vii 13 Active and Passive Aircraft Band 140 Introduction xi Receivers 14 VLF or Very Low Frequency 153 1 Radio Background and History 1 Radio Receiver 2 Identifying Components and Reading 12 15 Induction Loop Receiving System 165 Schematics 16 Lightning Storm Monitor 175 3 Electronic Parts Installation and 25 17 Ambient Power Receiver 186 Soldering 18 Earth Field Magnetometer Project 192 4 AM, FM, and Shortwave Crystal 39 Radio Projects 19 Sudden Ionospheric Disturbance 203 (SIDs) Receiver 5 TRF AM Radio Receiver 49 20 Aurora Monitor Project 212 6 Solid-State FM Broadcast Receiver 59 21 Ultra-Low Frequency (ULF) Receiver 224 7 Doerle Single Tube Super-Regenerative 70 Radio Receiver 22 Jupiter Radio Telescope Receiver 233 8 IC Shortwave Radio Receiver 81 23 Weather Satellite Receiver 246 9 80/40 Meter Code Practice Receiver 94 24 Analog to Digital Converters (ADCs) 262 10 WWV 10 MHz “Time-Code” Receiver 104 Appendix: Electronic Parts Suppliers 273 11 VHF Public Service Monitor 116 Index 277 (Action-Band) Receiver 12 6 & 2-Meter Band Amateur 127 Radio Receiver ix This page intentionally left blank Introduction 22 Radio Receiver Projects for the Evil Genius In Chapter 5, you will learn how AM radio is was created to inspire readers both young and old broadcast, from a radio station to a receiver in your to build and enjoy radio and receiver projects, and home, and how to build your own TRF or Tuned perhaps propel interested experimenters into a Radio Frequency AM radio receiver. In Chapter 6, career in radio, electronics or research. This book we will discover how FM radio works and how to is for people who are interested in radio and build an FM radio with an SCA output for electronics and those who enjoy building and commercial free radio broadcasts. experimenting as well as those who enjoy research. Chapter 7 will present the exciting world of Radio encompasses many different avenues for shortwave radio. Shortwave radio listening has a enthusiasts to explore, from simple crystal radios to large following and encompasses an entire hobby sophisticated radio telescopes. This book is an in itself. You will be able to hear shortwave attempt to show electronics and radio enthusiasts that stations from around the world, including China, there is a whole new world “out there” to explore. Russia, Italy, on your new shortwave broadcast Chapter 1 will present the history and receiver. Old time radio buffs will be interested in background and elements of radio, such as the single tube Doerle super-regenerative modulation techniques, etc. Chapter 2 will help the shortwave radio. newcomers to electronics, identifying components If you are interested in a portable shortwave and how to look and understand schematics vs. receiver that you could take on a camping trip, pictorial diagrams. Next, Chapter 3 will show the then you may want to construct the multi-band readers how to install electronic components onto integrated circuit shortwave radio receiver circuit boards and how to correctly solder before described in Chapter 8. embarking on their new radio building adventure. If you are interested in Amateur Radio or are We will start our adventure with the simple thinking of learning Morse code or want to “lowly” crystal radio in Chapter 4. Generally increase your code speed, you may want to crystal radios are only thought of as simple AM consider building this 80 and 40-meter code radios which can only pickup local broadcast receiver. This small lightweight portable receiver stations. But did you know that you can build can be built in a small enclosure and taken on crystal radios which can pickup long-distance camping trips, etc. stations as well as FM and shortwave broadcasts In Chapter 10, you will learn how to build and from around the world? You will learn how to use a WWW time code receiver, which can be used build an AM, FM and shortwave crystal radio, in to pick up time signal broadcast from the National this chapter.
Load more

Recommended publications
  • Citizens' Band (CB) Radio
    Citizens’ Band (CB) radio – Authorising Amplitude Modulation (AM) modes of operation Permitting AM double and single side band CB radio in the UK Statement Publication date: 10 December 2013 Contents Section Page 1 Executive Summary 1 2 Introduction and background 2 3 Consultation Responses 5 4 Conclusions and next steps 10 Annex Page 1 List of non-confidential respondents 11 Citizens’ Band (CB) radio – Authorising Amplitude Modulation (AM) modes of operation Section 1 1 Executive Summary 1.1 This Statement sets out Ofcom’s decision to proceed with proposals made in our Consultation “Citizens’ Band (CB) radio – Authorising Amplitude Modulation (AM) modes of operation”1 (the ‘Consultation') which was published on 7 October 2013 and closed on 8 November 2013. 1.2 The Consultation proposed to amend current arrangements for Citizens’ Band (CB) Radio in the UK to allow the use of Amplitude Modulation (AM) Double-sideband (DSB) and Single-sideband (SSB) transmission on CB radio. 1.3 Ofcom specifically proposed to: • Authorise the use of AM emissions on European Conference of Postal and Telecommunications Administrations (CEPT) harmonised channels in line with European Communication Committee (ECC) Decision (11)032; and • Authorise such use on a licence exempt basis (in line with our authorisation approach for other modes of operation for CB). 1.4 These proposals followed on from work carried out in Europe. In June 2011 the ECC, part of CEPT, published a Decision, ECC/DEC/ (11)03 (the ‘Decision’) on the harmonised use of frequencies for CB radio equipment. The Decision sought to harmonise the technical standards and usage conditions relating to the use of frequencies for CB radio equipment in CEPT administrations.
    [Show full text]
  • A Brief History of Radio Broadcasting in Africa
    A Brief History of Radio Broadcasting in Africa Radio is by far the dominant and most important mass medium in Africa. Its flexibility, low cost, and oral character meet Africa's situation very well. Yet radio is less developed in Africa than it is anywhere else. There are relatively few radio stations in each of Africa's 53 nations and fewer radio sets per head of population than anywhere else in the world. Radio remains the top medium in terms of the number of people that it reaches. Even though television has shown considerable growth (especially in the 1990s) and despite a widespread liberalization of the press over the same period, radio still outstrips both television and the press in reaching most people on the continent. The main exceptions to this ate in the far south, in South Africa, where television and the press are both very strong, and in the Arab north, where television is now the dominant medium. South of the Sahara and north of the Limpopo River, radio remains dominant at the start of the 21St century. The internet is developing fast, mainly in urban areas, but its growth is slowed considerably by the very low level of development of telephone systems. There is much variation between African countries in access to and use of radio. The weekly reach of radio ranges from about 50 percent of adults in the poorer countries to virtually everyone in the more developed ones. But even in some poor countries the reach of radio can be very high. In Tanzania, for example, nearly nine out of ten adults listen to radio in an average week.
    [Show full text]
  • VCO) for Frequency Shifting Or Synthesis in RF Front-End Circuitry
    A Low Power, Low Noise, 1.8GHz Voltage-Controlled Oscillator by Donald A. Hitko Bachelor of Science in Electrical Engineering GMI Engineering & Management Institute, 1994 Submitted to the Department of Electrical Engineering and Computer Science in partial fulfillment of the requirements for the degree of Master of Science in Electrical Engineering and Computer Science at the MASSACHUSETTS INSTITUTE OF TECHNOLOGY February 1997 © 1997 Massachusetts Institute of Technology All rights reserved. A u th o r ......... ......................................................................................... Department of Electrical Engineering and Computer Science September 27, 1996 C ertified by ........... ............ ...................................................... Charles G. Sodini Professor of Electrical Engineering and Computer Science fl q Thesis Supervisor Accepted by ..................-----. - ............. Acceptedby F. R. Morgenthaler Chai n, Department \'minittee on Graduate Students • ~MAR 0 6 1997 UF•BARIES A Low Power, Low Noise, 1.8 GHz Voltage-Controlled Oscillator by Donald A. Hitko Submitted to the Department of Electrical Engineering and Computer Science on September 27, 1996, in partial fulfillment of the requirements for the degree of Master of Science in Electrical Engineering. Abstract Transceivers which form the core of many wireless communications products often require a low noise voltage-controlled oscillator (VCO) for frequency shifting or synthesis in RF front-end circuitry. Since many wireless applications are focused on portability, low power operation is a necessity. Techniques for implementing oscillators are explored and then evaluated for the purposes of simultaneously realizing low noise and low power operation. Models for the design of oscillators and the analysis of oscillation stability are covered, and methods of calculating phase noise are discussed. These models and theories all point to the need for a high quality, passive, integrated inductor to meet the system goals.
    [Show full text]
  • Radio Communications in the Digital Age
    Radio Communications In the Digital Age Volume 1 HF TECHNOLOGY Edition 2 First Edition: September 1996 Second Edition: October 2005 © Harris Corporation 2005 All rights reserved Library of Congress Catalog Card Number: 96-94476 Harris Corporation, RF Communications Division Radio Communications in the Digital Age Volume One: HF Technology, Edition 2 Printed in USA © 10/05 R.O. 10K B1006A All Harris RF Communications products and systems included herein are registered trademarks of the Harris Corporation. TABLE OF CONTENTS INTRODUCTION...............................................................................1 CHAPTER 1 PRINCIPLES OF RADIO COMMUNICATIONS .....................................6 CHAPTER 2 THE IONOSPHERE AND HF RADIO PROPAGATION..........................16 CHAPTER 3 ELEMENTS IN AN HF RADIO ..........................................................24 CHAPTER 4 NOISE AND INTERFERENCE............................................................36 CHAPTER 5 HF MODEMS .................................................................................40 CHAPTER 6 AUTOMATIC LINK ESTABLISHMENT (ALE) TECHNOLOGY...............48 CHAPTER 7 DIGITAL VOICE ..............................................................................55 CHAPTER 8 DATA SYSTEMS .............................................................................59 CHAPTER 9 SECURING COMMUNICATIONS.....................................................71 CHAPTER 10 FUTURE DIRECTIONS .....................................................................77 APPENDIX A STANDARDS
    [Show full text]
  • Amateur Radio Satellites 101 an Introduction to the AMSAT “Easy Sats”
    Amateur Radio Satellites 101 An introduction to the AMSAT “Easy Sats” Presented to the: Fayette County Amateur Radio Club Presented by: Joe Domaleski, KI4ASK AMSAT #41409 Date: November 21, 2019 Revision 2 [email protected] 1 The real title of this presentation How to have a QSO on a repeater that is 4 inches square, traveling 17,000 MPH 600 miles away, in outer space, with a handheld radio, running 5 watts. 2 Agenda • Why satellites? • Where are the satellites located? • What is a “hamsat”? • What are the Easy Sats? • What’s inside a hamsat? • An example pass of AO-91 • Emergency traffic via AO-92 • Basic equipment I use • An example pass of AO-92 • Here’s how to make your 1st QSO • Where the “cool kids” hang out • Some memorable QSO’s Stone Mountain Hamfest 2019 • Other satellite topics with Daryl Young, K4RGK President of NFARL & • Some general tips AMSAT Ambassador • Suggested resources 3 Why satellites? • Easy to get started • Only need a Technician license • Doesn’t require expensive gear • DX when HF conditions are poor • Science involved in tracking • Camaraderie of AMSAT community • Skill involved in making contact • Fun for kids of all ages • Adds another skill to your toolkit • Like “foxhunting” in the sky • The passes are short • The wonderment of it all • Because I couldn’t be an astronaut • It’s a lot of fun! Example QSO with K5DCC https://www.facebook.com/dennyj/videos/10157742522839570/ 4 Where are the satellites located? The Easy Sats are in LEO – 300-600 miles up Source: Steve Green (KS1G) & Paul Stoetzer (N8HM) 5 What
    [Show full text]
  • Primer > PCR Measurements
    PCR Measurements PCR Measurements 1,E-01 1,E-02 1,E-03 1,E-04 1,E-05 1,E-06 1,E-07 1,E-08 1,E-09 10-5 10-4 10-3 0,01 0,1 1 10 100 Drift limiting region Jitter limiting region PCR Measurements Primer New measurements in ETR 2901 Synchronizing the Components of a Video Signal Abstract Delivering TV pictures from studio to home entails sending various types of One of the problems for any type of synchronization procedure is the jitter data: brightness, sound, information about the picture geometry, color, etc. on the incoming signal that is the source for the synchronization process. and the synchronization data. Television signals are subject to this general problem, and since the In analog TV systems, there is a complex mixture of horizontal, vertical, analog and digital forms of the TV signal differ, the problems due to jitter interlace and color subcarrier reference synchronization signals. All this manifest themselves in different ways. synchronization information is mixed together with the corresponding With the arrival of MPEG compression and the possibility of having several blanking information, the active picture content, tele-text information, test different TV programs sharing the same Transport Stream (TS), a mechanism signals, etc. to produce the programs seen on a TV set. was developed to synchronize receivers to the selected program. This The digital format used in studios, generally based on the standard ITU-R procedure consists of sending numerical samples of the original clock BT.601 and ITU-R BT.656, does not need a color subcarrier reference frequency.
    [Show full text]
  • History of Radio Broadcasting in Montana
    University of Montana ScholarWorks at University of Montana Graduate Student Theses, Dissertations, & Professional Papers Graduate School 1963 History of radio broadcasting in Montana Ron P. Richards The University of Montana Follow this and additional works at: https://scholarworks.umt.edu/etd Let us know how access to this document benefits ou.y Recommended Citation Richards, Ron P., "History of radio broadcasting in Montana" (1963). Graduate Student Theses, Dissertations, & Professional Papers. 5869. https://scholarworks.umt.edu/etd/5869 This Thesis is brought to you for free and open access by the Graduate School at ScholarWorks at University of Montana. It has been accepted for inclusion in Graduate Student Theses, Dissertations, & Professional Papers by an authorized administrator of ScholarWorks at University of Montana. For more information, please contact [email protected]. THE HISTORY OF RADIO BROADCASTING IN MONTANA ty RON P. RICHARDS B. A. in Journalism Montana State University, 1959 Presented in partial fulfillment of the requirements for the degree of Master of Arts in Journalism MONTANA STATE UNIVERSITY 1963 Approved by: Chairman, Board of Examiners Dean, Graduate School Date Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. UMI Number; EP36670 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent upon the quality of the copy submitted. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if material had to be removed, a note will indicate the deletion. UMT Oiuartation PVUithing UMI EP36670 Published by ProQuest LLC (2013).
    [Show full text]
  • Jan Karski Papers
    http://oac.cdlib.org/findaid/ark:/13030/tf187001bd No online items Register of the Jan Karski papers Finding aid prepared by Irena Czernichowska and Zbigniew L. Stanczyk Hoover Institution Library and Archives © 2003 434 Galvez Mall Stanford University Stanford, CA 94305-6003 [email protected] URL: http://www.hoover.org/library-and-archives Register of the Jan Karski papers 46033 1 Title: Jan Karski papers Date (inclusive): 1939-2007 Collection Number: 46033 Contributing Institution: Hoover Institution Library and Archives Language of Material: Polish Physical Description: 20 manuscript boxes, 11 oversize boxes, 1 oversize folder, 6 card file boxes, 24 photo envelopes, and 26 microfilm reels(21.8 Linear Feet) Abstract: Correspondence, memoranda, government documents, bulletins, reports, studies, speeches and writings, printed matter, photographs, clippings, newspapers, periodicals, sound recordings, videotape cassettes, and microfilm, relating to events and conditions in Poland during World War II, the German and Soviet occupations of Poland, treatment of the Jews in Poland during the German occupation, and operations of the Polish underground movement during World War II. Includes microfilm copies of Polish underground publications. Boxes 1-34 also available on microfilm (24 reels). Video use copies of videotape available. Sound use copies of sound recordings available. Creator: Karski, Jan, 1914-2000 Hoover Institution Library & Archives Access The collection is open for research; materials must be requested at least two business days in advance of intended use. Publication Rights For copyright status, please contact the Hoover Institution Library & Archives. Acquisition Information Materials were acquired by the Hoover Institution Library & Archives from 1946 to 2008. Preferred Citation [Identification of item], Jan Karski papers, [Box no., Folder no.
    [Show full text]
  • The Beginner's Handbook of Amateur Radio
    FM_Laster 9/25/01 12:46 PM Page i THE BEGINNER’S HANDBOOK OF AMATEUR RADIO This page intentionally left blank. FM_Laster 9/25/01 12:46 PM Page iii THE BEGINNER’S HANDBOOK OF AMATEUR RADIO Clay Laster, W5ZPV FOURTH EDITION McGraw-Hill New York San Francisco Washington, D.C. Auckland Bogotá Caracas Lisbon London Madrid Mexico City Milan Montreal New Delhi San Juan Singapore Sydney Tokyo Toronto McGraw-Hill abc Copyright © 2001 by The McGraw-Hill Companies. All rights reserved. Manufactured in the United States of America. Except as per- mitted under the United States Copyright Act of 1976, no part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher. 0-07-139550-4 The material in this eBook also appears in the print version of this title: 0-07-136187-1. All trademarks are trademarks of their respective owners. Rather than put a trademark symbol after every occurrence of a trade- marked name, we use names in an editorial fashion only, and to the benefit of the trademark owner, with no intention of infringe- ment of the trademark. Where such designations appear in this book, they have been printed with initial caps. McGraw-Hill eBooks are available at special quantity discounts to use as premiums and sales promotions, or for use in corporate training programs. For more information, please contact George Hoare, Special Sales, at [email protected] or (212) 904-4069. TERMS OF USE This is a copyrighted work and The McGraw-Hill Companies, Inc.
    [Show full text]
  • Recen/ED Apr261195
    RECEn/ED aPR 261195 _~cc ~AA"L KB8PK KG8PE ROOM Kevin J. Grammes Mike Grammes 4530 Mohawk Tr Adrian, lVII. 49221 Secretary FCC VV~D.C.20554 OOCKET F'LE copy ORKIW. RM-8626 VVe would like to express our concern over the proposed rule change, which would eliminate the ARRL VV1AVV code practice transmissions. VVe disagree with • Mr. MaJa, the ARRL VV1AVV code transmissions provide a valuable service to the existing and prospective amateur service. VVe both support morse code as a requirement for a amateur license and the transmissions provide a real atmosphere, ie: fading , interference, noise etc., to learn to copy morse code. I KB8PK used this in 1977 when i took my first test and again this year when i upgraded to Extra. My II year old son KG8PE used this last year when he took his tests. The code transmissions are a service to the amateur conununity and i fear a • degrada1ion ifMr. Maya proposal is passed. Sincerely, Kevin J. Grammes KB8PK 44~ Mike R. Grammes KG8PE 7hJ,z.e ~~ Con -/0 A"Rl No. of CopiM rle'd 0 UdABCOE --f~?~D-- '1/1¥/fS" RECE\\JEO ~~R 't bfilS Secretary Federal Communication Commission t,~,e .... il\ll Washington, D.C. 20554 FCC L Rlj "j , I' April 19, 1995 Re: Petition Number RM-8626 from Frederick O. Maia, W,5YI DOCKET FILE COpy ORIGINAl Gentlemen: Please consider these comments in response to Petition Number RM-8626. The petition requests the elimination of the rules that permit one-way information bulletins and Morse code practice in the amateur bands below 30 MHz.
    [Show full text]
  • Bell Telephone Magazine
    »y{iiuiiLviiitiJjitAi.¥A^»yj|tiAt^^ p?fsiJ i »^'iiy{i Hound / \T—^^, n ••J Period icsl Hansiasf Cttp public Hibrarp This Volume is for 5j I REFERENCE USE ONLY I From the collection of the ^ m o PreTinger a V IjJJibrary San Francisco, California 2008 I '. .':>;•.' '•, '•,.L:'',;j •', • .v, ;; Index to tne;i:'A ";.""' ;•;'!!••.'.•' Bell Telephone Magazine Volume XXVI, 1947 Information Department AMERICAN TELEPHONE AND TELEGRAPH COMPANY New York 7, N. Y. PRINTKD IN U. S. A. — BELL TELEPHONE MAGAZINE VOLUME XXVI, 1947 TABLE OF CONTENTS SPRING, 1947 The Teacher, by A. M . Sullivan 3 A Tribute to Alexander Graham Bell, by Walter S. Gifford 4 Mr. Bell and Bell Laboratories, by Oliver E. Buckley 6 Two Men and a Piece of Wire and faith 12 The Pioneers and the First Pioneer 21 The Bell Centennial in the Press 25 Helen Keller and Dr. Bell 29 The First Twenty-Five Years, by The Editors 30 America Is Calling, by IVilliani G. Thompson 35 Preparing Histories of the Telephone Business, by Samuel T. Gushing 52 Preparing a History of the Telephone in Connecticut, by Edward M. Folev, Jr 56 Who's Who & What's What 67 SUMMER, 1947 The Responsibility of Managcincnt in the r^)e!I System, by Walter S. Gifford .'. 70 Helping Customers Improve Telephone Usage Habits, by Justin E. Hoy 72 Employees Enjoy more than 70 Out-of-hour Activities, by /()/;// (/. Simmons *^I Keeping Our Automotive Equipment Modern. l)y Temf^le G. Smith 90 Mark Twain and the Telephone 100 0"^ Crossed Wireless ^ Twenty-five Years Ago in the Bell Telephone Quarterly 105 Who's Who & What's What 107 3 i3(J5'MT' SEP 1 5 1949 BELL TELEPHONE MAGAZINE INDEX.
    [Show full text]
  • Analogue & Digital Radio Worldwide
    Analogue & Digital Radio Worldwide MASS COMMUNICATION VIA SHORTWAVE HAS UNIQUE ADVANTAGES EVEN IN THE INTERNET AGE Global radio transmission via shortwave How it works Advantages of Shortwave Radio Simple, non-discriminatory reception Shortwave radio is radio transmission › Analogue or digital radio with of information on portable end user using shortwave radio frequencies, gen- one transmitter around the globe devices, independently from network erally 3.9–26.1 MHz (75–11 meter-band), › Audio transmission and data- providers and technical infrastructure: just above the medium-wave AM broad- transfer are possible These are the unique features which cast band. Shortwaves are directed at continue to make shortwave an impor- an angle into the sky can › Flexible transmission booking tant form of mass media. Therefore be reflected back to earth at great (daily, weekly, monthly or on- shortwave is an important platform for distances, beyond the horizon. Short- demand) public and commercial radio broad- wave radio is usually used for broad- › Reach thousands of people with casters as well as political and religious casting voice and music to shortwave one transmitter organisations to distribute their pro- listeners over entire continents or even grammes. larger areas. › Signals are hardly to disturb compared to Internet or satellite IONOSPHERE › Easy to receive with low-cost receivers SKYWAVE TRANSMITTER RECEIVER Shortwave stations of our partner service providers around the globe From Germany to the whole world › For providers of radio programmes intended for reception around the globe, Media Broadcast offers comprehensive consulting services and customised solutions for broadcasting signals via shortwave. We offer all required services- from one source, from IT-supported calculation of the desired transmission parameters and coordination of the suitable frequencies to technical broadcasting of the signals via our shortwave station in Nauen near Berlin.
    [Show full text]