Sigint Technical Primer-III
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Alpha • Bravo • Charlie
ALPHA • BRAVO • CHARLIE Inspired by Alpha, Bravo, Charlie (published by Phaidon) these Perfect activity sheets introduce young people to four different nautical codes. There are messages to decode, questions to answer for curious and some fun facts to share with friends and family. 5-7 year olds FLAG IT UP These bright, colorful flags are known as signal flags. There is one flag for each letter of the alphabet. 1. What is the right-hand side of a ship called? Use the flags to decode the answer! 3. Draw and color the flag that represents the first letter of your name. 2. Draw and color flags to spell out this message: SHIP AHOY SH I P AHOY FUN FACT Each flag also has its own To purchase your copy of meaning when it's flown by 2. Alpha, Bravo, Charlie visit phaidon.com/childrens2016 itself. For example, the N flag by STARBOARD 1. itself means "No" or "Negative". Answers: ALPHA OSCAR KILO The Phonetic alphabet matches every letter with a word so that letters can’t be mixed up and sailors don’t get the wrong message. 1. Write in the missing first letters from these words in the Phonetic alphabet. What word have you spelled out? Write it in here: HINT: The word for things that are transported by ship. 2. Can you decode the answer to this question: What types of cargo did Clipper ships carry in the 1800s? 3. Use the Phonetic alphabet to spell out your first name. FUN FACT The Phonetic alphabet’s full name is the GOLD AND WOOL International Radiotelephony Spelling Alphabet. -
UNIT 2 Braille
Mathematics Enhancement Programme Codes and UNIT 2 Braille Lesson Plan 1 Braille Ciphers Activity Notes T: Teacher P: Pupil Ex.B: Exercise Book 1 Introduction T: What code, designed more than 150 years ago, is still used Whole class interactive extensively today? discussion. T: The system of raised dots which enables blind people to read was Ps might also suggest Morse code designed in 1833 by a Frenchman, Louis Braille. or semaphore. Does anyone know how it works? Ps might have some ideas but are T: Braille uses a system of dots, either raised or not, arranged in unlikely to know that Braille uses 3 rows and 2 columns. a 32× configuration. on whiteboard Here are some possible codes: ape (WB). T puts these three Braille letters on WB. T: What do you notice? (They use different numbers of dots) T: We will find out how many possible patterns there are. 10 mins 2 Number of patterns T: How can we find out how many patterns there are? Response will vary according to (Find as many as possible) age and ability. T: OK – but let us be systematic in our search. What could we first find? (All patterns with one dot) T: Good; who would like to display these on the board? P(s) put possible solutions on the board; T stresses the logical search for these. Agreement. Praising. (or use OS 2.1) T: Working in your exercise books (with squared paper), now find all possible patterns with just 2 dots. T: How many have you found? Allow about 5 minutes for this before reviewing. -
The Future of Human-Computer Interaction: Overview of Input Devices
The future of human-computer interaction: overview of input devices Fabrizio Fornari School of Computer Science H´ask´olinn´ıReykjav´ık- Reykjav´ıkUniversity Reykjav´ık,Iceland November, 2012 Abstract We are in 2012 and we are still using the mouse and the keyboard to interact with a computer. We have seen a lot of changes in the world of Computer Science, relating to: performance, design and the way we interact with the computer. Differ- ent input devices have been developed around the computer, starting from the most recent touchscreens, continuing with webcams, microphones, and arriving to the oldest mice and keyboards. The aim of this research is to let the reader imagine a new way to interact with the computer. To reach our purpose, we introduce advanced technologies such as: Speech and Voice Recognition, Electronic Perception, Eye Tracking and Brain Computer In- terfaces. We propose examples of the cited technologies that may change the paradigm that saw, until now, keyboard and mouse as leaders of the input devices. 1 1 Introduction From the computer's birth1, we saw a lot of changes in the world of Com- puter Science. Changes relating to: performance, design and human-computer interaction [49]. A few years ago, the words \input device" evoked in our mind only two specific objects: the keyboard and the mouse - the main instruments used to provide data to a personal computer. Keyboard and mouse are, in fact, two of the first input devices in the history of computer. Nowadays, with the evolution of computers, we have a large set of input de- vices that changed the way we interact with the computer. -
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 -
A High-Performance, Single-Signal, Direct-Conversion Receiver with DSP Filtering
By Rob Frohne, KL7NA A High-Performance, Single- Signal, Direct-Conversion Receiver with DSP Filtering By adding a DSP demodulator to a well-established and popular receiver design—KK7B’s R2— you can have a bit of the latest filter technology at your fingertips! ith so many new radios incor- realistic to have a digital filter with the Motorola 56002 processor uses 24 bits of porating digital signal proces- equivalent of hundreds of poles. (In the precision; the TI TMS320C5X uses only sing (DSP) for demodulation analog domain, it takes one inductor or 16. It was obvious that we needed to start W and filtering, I got the itch to capacitor to make one pole.) Few analog over. play with one myself. By “play with one,” designers use more than ten poles in a fil- That start didn’t come until I taught a I don’t mean merely operate a DSP- ter, because it’s very difficult to make an communication systems course during the equipped receiver, I wanted to be able to analog filter with more than about ten poles winter quarter of 1996. As a homework as- put my own software into the receiver and work properly. signment, I had my students try the Motorola put to work some of those nifty signal-pro- EVM (evaluation module) in place of the cessing ideas I teach others how to use! Some Background TI DSK. It proved simple to modify a filter This project started in 1994. Ralph program supplied by Motorola to do the Why DSP? Stirling, KC3F, and I did exactly what Rick basic filtering necessary for SSB demo- You may wonder “What’s the big deal?” Campbell, KK7B, suggested in his R2 re- dulation, and it worked much better than the Why are so many of the new radios sup- ceiver article.1 (Get your copy of that article TI DSK-based receiver. -
Multimedia Data and Its Encoding
Lecture 14 Multimedia Data and Its Encoding M. Adnan Quaium Assistant Professor Department of Electrical and Electronic Engineering Ahsanullah University of Science and Technology Room – 4A07 Email – [email protected] URL- http://adnan.quaium.com/aust/cse4295 CSE 4295 : Multimedia Communication prepared by M. Adnan Quaium 1 Text Encoding The character by character encoding of an alphabet is called encryption. As a rule, this coding must be reversible – the reverse encoding known as decoding or decryption. Examples for a simple encryption are the international phonetic alphabet or Braille script CSE 4295 : Multimedia Communication prepared by M. Adnan Quaium 2 Text Encoding CSE 4295 : Multimedia Communication prepared by M. Adnan Quaium 3 Morse Code Samuel F. B. Morse and Alfred Vail used a form of binary encoding, i.e., all text characters were encoded in a series of two basic characters. The two basic characters – a dot and a dash – were short and long raised impressions marked on a running paper tape. Word borders are indicated by breaks. CSE 4295 : Multimedia Communication prepared by M. Adnan Quaium 4 Morse Code ● To achieve the most efficient encoding of the transmitted text messages, Morse and Vail implemented their observation that specific letters came up more frequently in the (English) language than others. ● The obvious conclusion was to select a shorter encoding for frequently used characters and a longer one for letters that are used seldom. CSE 4295 : Multimedia Communication prepared by M. Adnan Quaium 5 7 bit ASCII code CSE 4295 : Multimedia Communication prepared by M. Adnan Quaium 6 Unicode Standard ● The Unicode standard assigns a number (code point) and a name to each character, instead of the usual glyph. -
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. -
Designing the Haptic Interface for Morse Code Michael Walker University of South Florida, [email protected]
University of South Florida Scholar Commons Graduate Theses and Dissertations Graduate School 10-31-2016 Designing the Haptic Interface for Morse Code Michael Walker University of South Florida, [email protected] Follow this and additional works at: http://scholarcommons.usf.edu/etd Part of the Art Practice Commons, Communication Commons, and the Neurosciences Commons Scholar Commons Citation Walker, Michael, "Designing the Haptic Interface for Morse Code" (2016). Graduate Theses and Dissertations. http://scholarcommons.usf.edu/etd/6600 This Thesis is brought to you for free and open access by the Graduate School at Scholar Commons. It has been accepted for inclusion in Graduate Theses and Dissertations by an authorized administrator of Scholar Commons. For more information, please contact [email protected]. Designing the Haptic Interface for Morse Code by Michael Walker A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Mechanical Engineering Department of Mechanical Engineering College of Engineering University of South Florida Major Professor: Kyle Reed, Ph.D. Stephanie Carey, Ph.D. Don Dekker, Ph.D. Date of Approval: October 24, 2016 Keywords: Bimanual, Rehabilitation, Pattern, Recognition, Perception Copyright © 2016, Michael Walker ACKNOWLEDGMENTS I would like to thank my thesis advisor, Dr. Kyle Reed, for providing guidance for my first steps in research work and exercising patience and understanding through my difficulties through the process of creating this thesis. I am thankful for my colleagues in REED lab, particularly Benjamin Rigsby and Tyagi Ramakrishnan, for providing helpful insight in the design of my experimental setup. TABLE OF CONTENTS LIST OF TABLES ........................................................................................................................ -
Technical Handbook for Radio Monitoring HF
Technical Handbook for Radio Monitoring HF Edition 2013 2 Dipl.- Ing. Roland Proesch Technical Handbook for Radio Monitoring HF Edition 2013 Description of modulation techniques and waveforms with 259 signals, 448 pictures and 134 tables 3 Bibliografische Information der Deutschen Nationalbibliothek Die Deutsche Nationalbibliothek verzeichnet diese Publikation in der Deutschen Nationalbibliografie; detaillierte bibliografische Daten sind im Internet über http://dnb.d-nb.de abrufbar. © 2013 Dipl.- Ing. Roland Proesch Email: [email protected] Production and publishing: Books on Demand GmbH, Norderstedt, Germany Cover design: Anne Proesch Printed in Germany Web page: www.frequencymanager.de ISBN 9783732241422 4 Acknowledgement: Thanks for those persons who have supported me in the preparation of this book: Aikaterini Daskalaki-Proesch Horst Diesperger Luca Barbi Dr. Andreas Schwolen-Backes Vaino Lehtoranta Mike Chase Disclaimer: The information in this book have been collected over years. The main problem is that there are not many open sources to get information about this sensitive field. Although I tried to verify these information from different sources it may be that there are mistakes. Please do not hesitate to contact me if you discover any wrong description. 5 6 Content 1 LIST OF PICTURES 19 2 LIST OF TABLES 29 3 REMOVED SIGNALS 33 4 GENERAL 35 5 DESCRIPTION OF WAVEFORMS 37 1.1 Analogue Waveforms 37 Amplitude Modulation (AM) 37 Double Sideband reduced Carrier (DSB-RC) 38 Double Sideband suppressed Carrier (DSB-SC) 38 Single Sideband -
Federal Communications Commission § 80.110
SUBCHAPTER D—SAFETY AND SPECIAL RADIO SERVICES PART 80—STATIONS IN THE 80.71 Operating controls for stations on land. MARITIME SERVICES 80.72 Antenna requirements for coast sta- tions. Subpart A—General Information 80.74 Public coast station facilities for a te- lephony busy signal. GENERAL 80.76 Requirements for land station control Sec. points. 80.1 Basis and purpose. 80.2 Other regulations that apply. STATION REQUIREMENTS—SHIP STATIONS 80.3 Other applicable rule parts of this chap- 80.79 Inspection of ship station by a foreign ter. Government. 80.5 Definitions. 80.80 Operating controls for ship stations. 80.7 Incorporation by reference. 80.81 Antenna requirements for ship sta- tions. Subpart B—Applications and Licenses 80.83 Protection from potentially hazardous RF radiation. 80.11 Scope. 80.13 Station license required. OPERATING PROCEDURES—GENERAL 80.15 Eligibility for station license. 80.17 Administrative classes of stations. 80.86 International regulations applicable. 80.21 Supplemental information required. 80.87 Cooperative use of frequency assign- 80.25 License term. ments. 80.31 Cancellation of license. 80.88 Secrecy of communication. 80.37 One authorization for a plurality of 80.89 Unauthorized transmissions. stations. 80.90 Suspension of transmission. 80.39 Authorized station location. 80.91 Order of priority of communications. 80.41 Control points and dispatch points. 80.92 Prevention of interference. 80.43 Equipment acceptable for licensing. 80.93 Hours of service. 80.45 Frequencies. 80.94 Control by coast or Government sta- 80.47 Operation during emergency. tion. 80.49 Construction and regional service re- 80.95 Message charges. -
Maintenance of Remote Communication Facility (Rcf)
ORDER rlll,, J MAINTENANCE OF REMOTE commucf~TIoN FACILITY (RCF) EQUIPMENTS OCTOBER 16, 1989 U.S. DEPARTMENT OF TRANSPORTATION FEDERAL AVIATION AbMINISTRATION Distribution: Selected Airway Facilities Field Initiated By: ASM- 156 and Regional Offices, ZAF-600 10/16/89 6580.5 FOREWORD 1. PURPOSE. direction authorized by the Systems Maintenance Service. This handbook provides guidance and prescribes techni- Referenceslocated in the chapters of this handbook entitled cal standardsand tolerances,and proceduresapplicable to the Standardsand Tolerances,Periodic Maintenance, and Main- maintenance and inspection of remote communication tenance Procedures shall indicate to the user whether this facility (RCF) equipment. It also provides information on handbook and/or the equipment instruction books shall be special methodsand techniquesthat will enablemaintenance consulted for a particular standard,key inspection element or personnel to achieve optimum performancefrom the equip- performance parameter, performance check, maintenance ment. This information augmentsinformation available in in- task, or maintenanceprocedure. struction books and other handbooks, and complements b. Order 6032.1A, Modifications to Ground Facilities, Order 6000.15A, General Maintenance Handbook for Air- Systems,and Equipment in the National Airspace System, way Facilities. contains comprehensivepolicy and direction concerning the development, authorization, implementation, and recording 2. DISTRIBUTION. of modifications to facilities, systems,andequipment in com- This directive is distributed to selectedoffices and services missioned status. It supersedesall instructions published in within Washington headquarters,the FAA Technical Center, earlier editions of maintenance technical handbooksand re- the Mike Monroney Aeronautical Center, regional Airway lated directives . Facilities divisions, and Airway Facilities field offices having the following facilities/equipment: AFSS, ARTCC, ATCT, 6. FORMS LISTING. EARTS, FSS, MAPS, RAPCO, TRACO, IFST, RCAG, RCO, RTR, and SSO. -
Federal Communications Commission § 97.307
Federal Communications Commission § 97.307 § 97.307 Emission standards. (1) No angle-modulated emission may have a modulation index greater than 1 (a) No amateur station transmission at the highest modulation frequency. shall occupy more bandwidth than nec- (2) No non-phone emission shall ex- essary for the information rate and ceed the bandwidth of a communica- emission type being transmitted, in ac- tions quality phone emission of the cordance with good amateur practice. same modulation type. The total band- (b) Emissions resulting from modula- width of an independent sideband emis- tion must be confined to the band or sion (having B as the first symbol), or segment available to the control opera- a multiplexed image and phone emis- tor. Emissions outside the necessary sion, shall not exceed that of a commu- bandwidth must not cause splatter or nications quality A3E emission. keyclick interference to operations on (3) Only a RTTY or data emission adjacent frequencies. using a specified digital code listed in (c) All spurious emissions from a sta- § 97.309(a) of this part may be transmit- tion transmitter must be reduced to ted. The symbol rate must not exceed the greatest extent practicable. If any 300 bauds, or for frequency-shift key- spurious emission, including chassis or ing, the frequency shift between mark power line radiation, causes harmful and space must not exceed 1 kHz. interference to the reception of an- (4) Only a RTTY or data emission other radio station, the licensee of the using a specified digital code listed in interfering amateur station is required § 97.309(a) of this part may be transmit- to take steps to eliminate the inter- ted.