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ACU-M™ Improving In-Building Communications
Application Note: AN-2306-2 ACU-M™ Improving In-Building Communications Purpose This application note will describe methods in which the Raytheon’s ACU-M can be used to improve in-building communications. The application note will discuss permanent and temporary methods at which different devices can help increase the ability to transmit or receive land mobile radio communications from within a building, below-grade, or behind obstructions. Introduction Land mobile radios, whether used in vehicles or as handheld portables, are an important tool used everyday by first responders to make their jobs safer and more efficient. In the most part, these radio systems function as designed, and serve the end-user with reliable communications. However, when the duties of a first responder require them to enter a building, or operate below- grade during emergencies, the ability of their radios to communicate to the base, incident command or dispatcher may become an issue. One physical constraint of land mobile radio communications is its inability to transmit and receive radio waves through obstructions such as buildings or below-grade structures. The failure of a land mobile radio to transmit and receive communications from within a building or below-grade has cursed radio users since the beginning of land mobile radio communications (see Figure 1). Figure 1: Blockage or Absorption of Low-Power Handheld Radio Transmission Raytheon 5800 Departure Drive Raleigh, NC 27616 919.790.1011 © Raytheon Company. Data is subject to change. http://www.raytheon.com All Trademarks are the property of their respective owners. Application Note: AN-2306-2 Solutions Land mobile radios were first introduced to public safety, in the late 20’s, in the form of shortwave receivers mounted inside patrol vehicles. -
Rs-232 Rs-422 Rs-485
ConceptConcept ofof SerialSerial CommunicationCommunication AgendaAgenda Serial v.s. Parallel Simplex , Half Duplex , Full Duplex Communication RS-485 Advantage over RS-232 SerialSerial v.s.v.s. ParallelParallel Application: How to Measure the temperature in a long distance? Measuring with a DAC card: 1200 m Remote sensor Control room T/C wire T/C A/D noise Application: How to Measure the temperature in a long distance? Measuring with a remote I/O module: 1200 m Remote sensor Control room T/C Remote I/O Standard Serial Communication T/C signal, 4-20mA, 0-5V… Noise rejection (Differential signal) MostMost PopularPopular 33 typestypes ofof SerialSerial Comm.Comm. z Most commonly available Tx Rx Rx Tx z Simple wiring CTS RTS z Low cost RTS CTS RS-232 z Short length (40 ft) DTR DSR DSR DTR Bar code reader z Slow data rates GND GND z Subject to noise Tx+ z High data rates Tx- z Longer cable lengths (4000 ft) Rx+ Rx- RS-422 z Full-duplex GND z Noise rejection PLC z Multipoint application (Up to 32 units) z Low cost Data+ z Longer cable lengths (4000 ft) Data- RS-485 zNoise immunity GND zHalf-duplex PLC SerialSerial V.S.V.S. ParallelParallel CommunicationCommunication Serial Communication Transfer the data bit by bit Synchronous Data Transfer Bit Send Data Receive Data Parallel Communication Transfer the all data simultaneously Asynchronous Data Transfer Bit Bit Bit Bit Bit Bit Bit Bit Send Data Receive Data SimplexSimplex ,, HalfHalf DuplexDuplex ,, FullFull DuplexDuplex CommunicationCommunication SimplexSimplex CommunicationCommunication Simplex Communication : – Data in a simplex channel is always one way. -
Johnson County Iowa ARES®/RACES
Johnson County Iowa ARES®/RACES At your service for Emergency and Public Service Communications What is Amateur Radio? More than 700,000 US radio operators licensed by the Federal Communications Commission (FCC) after completion of written exams on radio theory, operating principles and FCC regulations. A radio service authorized by the FCC with the following as one of its fundamental purposes: • Provide a voluntary, non-commercial communication service in the community during times of emergency. Capabilities include: • VHF/UHF - Local Communications via repeaters or simplex modes • DX - Long Range Communications operated on HF bands with the ability to communicate world-wide. • CW - Communications via Morse Code • Digital Modes - Communications computer to computer via radio, email over radio. • Amateur Television, Amateur Satellites Amateur Radio is not Citizen’s Band (CB), Family Radio Service (FRS), General Mobile Radio Service (GMRS) or Business Band radio, although Amateur Radio operators might use these other services as well. What Is ARES/RACES? Amateur Radio operators nationwide who have voluntarily registered their qualifications and equipment and formed an organized pool of operators to provide reliable primary and secondary communications links for governmental agencies and/or non-profit organizations when needed. Amateur Radio Emergency Service® (ARES) is sponsored by the ARRL, the national organization for Amateur Radio. ARES can be activated by any supported agency or non-profit organization in accordance with Memoranda of Understanding. Radio Amateur Civil Emergency Service (RACES) provides for Amateur Radio operation in support of government agencies during periods of declared emergencies only, as authorized by Emergency Management officials. Johnson County ARES/RACES members are dual enrolled in both organizations to enable them to provide support in virtually any situation. -
Radio Training Notes
BUSH SEARCH AND RESCUE VICTORIA RADIO TRAINING NOTES BSAR members use Police and CB radios on search operations. These notes cover the skills required to effectively use those radios, including: How to use the controls on the Police and CB radios Sending and receiving radio messages The radio checks required prior to leaving the search base Use of call signs Use of pro-words such as Standby, Over, Say again, Out Use of the phonetic alphabet: e.g. Bravo Sierra Alpha Romeo Send, receive and record location information with grid references in correct format. Reference: BSAR Manual Chapter 11: Additional Skills - Communications Section, pp 82-90. RADIO SAFETY Do NOT operate any radio in an explosive atmosphere Obey “Turn Off Two-way Radio” instructions eg at petrol stations, hospitals, etc Do NOT touch the antenna when transmitting Do NOT transmit when the antenna is missing or damaged. ACKNOWLEDGEMENTS Thanks to Rik Head for preparing these notes. Use of the Victoria Police radio instruction sheet is acknowledged in developing parts of these notes. The radio images are courtesy of Simoco and Uniden. The radio system diagrams are courtesy of Rik Head. Version: 2.7 Date: Jan 2015 Bush Search And Rescue Victoria Radio System Types There are two basic types of radio systems, conventional and trunking systems and within conventional systems there are two modes: simplex and repeater operation. Simplex – a conventional radio system Remote Base f1 (if in place) Good reception - high on hill f1 f1 Simplex Operation Search Base Poor reception One channel - uses No reception - Good reception - due to foliage the same transmit and shaded by hill close by & line of sight receive frequency Simplex channels use a single frequency (f1) for transmit and receive and allow direct communications between one radio and all other that are within range. -
Radio Communications for ACS DR – a Primer North American Division of Seventh-Day Adventists®
NAD ACS DR Radio Communications For ACS DR – A Primer North American Division of Seventh-day Adventists® ADVENTIST COMMUNITY SERVICES® Radio Communications For ACS DR - A Primer © 2019, North American Division of Seventh-day Adventist®, Adventist Community Services®, all Rights Reserved. Use only by permission. Release Date: ___, 2019 Page 1 of 12 NAD ACS DR Radio Communications For ACS DR – A Primer TABLE OF CONTENTS Introduction………………………………………………………………………….03 Explanation of Radio Classes…………………………………………….………….04 FRS Radio System…………………………………………………………..……….04 VHF Radio System……………………………………………………..……………05 Amateur Radio System…………………………………………..…………………..06 A Transmission Restriction That Applies to All Radios……………..….…………..07 Appendix 1 – An Explanation of Transmission Range Restriction………………….08 Appendix 2 – Radio Types Illustrated ………………….……………….………….11 Appendix 3 – Radio Courtesy……………………….….…………………………...12 © 2019, North American Division of Seventh-day Adventist®, Adventist Community Services®, all Rights Reserved. Use only by permission. Release Date: ___, 2019 Page 2 of 12 NAD ACS DR Radio Communications For ACS DR – A Primer INTRODUCTION ACS DR teams have been called upon to manage a variety of Donations Management situations, from assisting with Points of Distribution (PODS) to Community Collections Centers to Multi- Agency Warehouses, and Emergency Distribution Centers. When the operation is quite small, communication among team leaders may be easily done by just walking over to the other person and having a face-to-face conversation. However, when the operation is larger, using radios may be more effective. This course is intended to be a basic introduction to several radio classes/services. It is by no means intended to be thorough for any of the radio classes discussed. There is much more that can be learned about each radio class through further study. -
Mhz As a Primary User
Response to Ofcom Consultation Q1. What future uses might this spectrum support? The availability of this spectrum is a rare opportunity. As such, the benefits should be made to the general public, as well the business stakeholders. 1. Amateur Radio:The UK Amateur Radio service is allocated the 2m band from 144.000 to 146.000 MHz as a Primary User. In comparison, the USA has an allocation from 144.000 through to 148.000 MHz. An expansion of this band by 0.5 – 1 MHz immediately above 146.000 MHz will be beneficial to the amateur radio community. 2. VHF Citizens' Band service: The UK only CB Service at 934 MHz was withdrawn in 1998, with the loss of 20 channels to GSM 900 Mobile operators. This is an opportunity to re-introduce a 20 channel CB service, at a frequency range which does not have the propagation characteristics of the 27 MHz band. An allocation at VHF will allow practical antenna lengths to be used in vehicles and buildings. In comparison, ACMA (Ofcom's counterpart in Australia) has sanctioned the use of a 77 Channel “UHF CB” service at around 476 – 477 MHz. 3. Simple UK (Business Radio): The business radio Simple UK licence permits 15 spot frequencies to be used at a 12.5 kHz bandwidth. The addition of more frequencies for this licence type will ease congestion. 4. A “personal use” radio service: There are a number of licensable and licence-free radio services available for individuals. This include PMR446 (licence-free) and the licensable Business Radio (Simple UK), as well as CB Radio on 27 MHz and a number of low-power allocations. -
Ubc92xlt Scanner
UBC92XLT SCANNER 200 Channels 6 Pre-Programmed Service Banks with Close CallTM RF Capture OWNER’S MANUAL Precautions PrecautionsBefore you use this scanner, please read and observe the following. EARPHONE WARNING! Use only a genuine Uniden earphone. An incorrect earphone may be hazardous to your hearing. Turn down volume before connecting the earphone and then adjust volume to suit. WARNING! Uniden does not represent this unit to be water- proof. To reduce the risk of fire or electrical shock, do not expose this unit to rain or moisture. Trademarks used throughout this manual are the property of their respective holders. Precautions 2 UBC92XLT Controls and Display Antenna UBC92XLT ControlsHeadphone and Display Jack (see “Connecting the Antenna” on Page 19) Squelch Volume Display DC 6V UBC92XLT Jack Power Keypad UBC92XLT Controls and Display 3 Contents Introduction ........................................................... 6 FeatureContents Highlights ................................................. 8 About This Manual ........................................... 9 Understanding Scanning .................................... 11 What is Scanning? ......................................... 11 What is Searching? ........................................ 11 Conventional Scanning ................................... 11 Where To Obtain More Information ............... 13 Included With Your Scanner ............................... 14 Setting Up Your Scanner .................................... 15 Using Internal Batteries ................................. -
Restricted Radiotelephone Operator's
INDEPENDENT COMMUNICATIONS AUTHORITY OF SOUTH AFRICA RESTRICTED RADIOTELEPHONE OPERATOR’S EXAMINATION GUIDE (VHF, MF AND HF) June 2008 TABLE OF CONTENTS EXAMINATION PAYMENT INFORMATION ________________________________________ 3 BACKGROUND ______________________________________________________________ 4 COMMENTS _________________________________________________________________ 8 SYLLABUS FOR THE POSTMASTER GENERAL’S RESTRICTED CERTIFICATE __________ 8 EXAMINATION ARRANGEMENTS _______________________________________________ 9 IMPORTANT RADIOTELEPHONE FREQUENCIES __________________________________ 9 IMPORTANT VHF MARITIME FREQUENCIES ______________________________________ 9 RADIOTELEPHONE DISTRESS PROCEDURE _____________________________________ 9 RADIOTELEPHONE URGENCY ________________________________________________ 15 RADIOTELEPHONE SAFETY __________________________________________________ 16 MARINE TERMINOLOGY & MODES OF EMISSION ________________________________ 17 ALARM SIGNALS ____________________________________________________________ 18 EPIRBS, VERY IMPORTANT CHECKS ON EPIRBS ________________________________ 18 SART (SEARCH AND RESCUE RADAR TRANSPONDER) ___________________________ 19 NAVTEX RECEIVERS ________________________________________________________ 19 SATELLITE COMMUNICATIONS _______________________________________________ 19 RADIOTELEPHONE CALLING PROCEDURE _____________________________________ 20 TABLE OF CALLING AND ANSWERING FREQUENCIES ____________________________ 21 RADIOTELEGRAMS _________________________________________________________ -
Airband Radio Operator Certificate Manual
Airband Radio Operator Certificate Manual 1- Version: January 2012 About the airband radio operator license Very high frequency (VHF) airband radios are becoming more common as a tool for aircraft pilots to identify the location and intention of other aircraft in their vicinity (for VHF use at non-towered aerodromes see Civil Aviation Advisory Publication 166-1(0) and 166-2(0)).i In some classes of airspace the use of VHF airband radios is mandatory. Using a VHF airband radio requires a license endorsement. To obtain a VHF airband radio operators license you must satisfactorily (80% pass mark) complete both written and practical exams. This manual provides you with information regarding VHF airband radio use in Australia for the satisfactory completion of the written VHF airband radio operator examination. Radio communications in Australian are controlled by the Australian Communications and Media Authority ( www.acma.gov.au ). About the airband Airband radios transmit and receive a radio frequency. Radios are set to transmit and receive on specific frequencies across a band of frequencies. The radio waves that are transmitted and received are base on wavelengths and amplitudes. A cycle is one complete wave action. The frequency, measured in Hertz, is the number of cycles passing a given point in one second. One cycle per second = 1 Hertz (Hz) 1,000 Hz = 1 kilohertz (KHz) 1,000 KHz = 1 megahertz (MHz) 1,000 MHz = 1 gigahertz (GHz) The wavelength is the length of one cycle. The height of the peak or trough from the centreline is called the amplitude ; the greater the amplitude, the stronger the signal. -
JULY 1962 50C
JULY 1962 50c the citizens bare journal www.americanradiohistory.com INTERNATIONAL'S Executive k8 o Check these outstanding features .. Crystal filter for minimizing adjacent channel interference. Built-in calibration circuit 12 position crystal controlled transmit channel selector Front panel micro- phone jack Provision for connecting external speaker and S/meter Tunable dual conversion superheterodyne receiver covering all 23 channel Two crystal controlled receive positions Push -to -talk operation Three way power supply for 6/12 vdc and 115 vac Five watts plate input Certified tolerance ±.005% Brown cabinet with brown and silver panel Dimensions: 51/2" H. x 81/2" W. x 9" D. Complete with 1 transmit crystal, 1 receive crystal, new style ceramic microphone and coil cord $199.50 Model 100 0 Executive Approved For Canada International's Model 100 B with built-in speech clipper is now fully certified and approved for two way Citizens communication throughout the Dominion of Canada. Visit your dealer today and ask him for a demon- stration. Model 100 B complete with microphone $239.50 www.americanradiohistory.com The International Model 100 Executive is designed for top performance and dependability. Here is a transceiver to fill the requirements of the most demanding Citizens licensee. Twelve crystal controlled transmit channels, a tunable dual conversion superheterodyne receiver covering all 23 channels, plus two crystal controlled receive positions are only a few of the out- standing features of the Model 100. Highest quality components and rugged construction add up to years of trouble free operation.. model 100 EXECUTIVE ACCESSORIES .. External Speaker S/Meter The perfect companion unit for the Model 100 Executive. -
Voice Radio Communications Guide for the Fire Service June 2016
U.S. Fire Administration Voice Radio Communications Guide for the Fire Service June 2016 U.S. Fire Administration Mission Statement We provide National leadership to foster a solid foundation for our fi re and emergency services stakeholders in prevention, preparedness, and response. This page intentionally left blank. Voice Radio Communications Guide for the Fire Service i Acknowledgment The U.S. Fire Administration (USFA) is committed to using all means possible for reducing the incidence of injuries and deaths to firefighters. One of these means is to partner with organizations that share this same admirable goal. One such organization is the International Association of Fire Fighters (IAFF). As a labor union, the IAFF has been deeply committed to improving the safety of its members and all firefighters as a whole. This is why the USFA was pleased to work with the IAFF through a partnership supported by the U.S. Department of Homeland Security (DHS), Science and Technology Directorate, First Responders Group, Office for Interoperability and Compatibility to develop this second edition of the “Voice Radio Communications Guide for the Fire Service.” The USFA gratefully acknowledges the following leaders of the IAFF for their willingness to partner on this project: General President Harold Schaitberger General Secretary-Treasurer Thomas Miller Assistant to the General President Occupational Health, Safety and Medicine Patrick Morrison International Association of Fire Fighters, AFL-CIO, CLC Division of Occupational Health, Safety and Medicine -
Cover to Be Determined
LAUSD IT Architecture Summary Revised - March 1, 2007 Los Angeles Unified School District Information Technology Division 333 South Beaudry Ave. 10th Floor, Suite 167 Los Angeles, CA 90017 Los Angeles Unified School District Information Technology Architecture 2006 __________________________________________________________ IT Architecture Summary TABLE OF CONTENTS 1. REVISION HISTORY ......................................................................................................................................3 2. INTRODUCTION..............................................................................................................................................4 2.1 DISTRICT IT AT A GLANCE ..........................................................................................................................4 2.1.1 Central Tier ...........................................................................................................................................5 2.1.2 Distribution Tier ....................................................................................................................................5 2.1.3 Edge Locations ......................................................................................................................................6 2.2 ORGANIZATION OF THE DOCUMENT ............................................................................................................7 3. LAUSD BACKGROUND..................................................................................................................................8