Mobile Train Radio Communication
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03-09-2009, 02:10 AM


Each mobile uses a separate, temporary radio channel to talk to the cell site. The cell site talks to many mobiles at once, using one channel per mobile. Channels use a pair of frequencies for communication. One for transmitting from the cell site, the forward link, and one frequency for the cell site to receive calls from the users, the reverse link.
Communication between mobile units can be either half-duplex or full-duplex. In case of half-duplex, transmit and receive communications between the mobile units are not at the same time, i.e. talking and listening can not be done at the same time. In case of full-duplex communication, transmit and receive communication is at the same time, i.e. one can talk and listen at the same time.
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07-10-2010, 03:26 PM


.doc   Mobile radio.doc (Size: 180.5 KB / Downloads: 149)
This article is presented by:
Anirudh Nanda
B.Tech-M.Tech(ECE)
Lovely Professional University


Abstract
The term paper includes a brief introduction to mobile radio communication. This term paper also includes a brief mention of 2 way comm’n,it’s history, the role that it plays in our everyday life with its various future advancements. It also includes a discussion of antennas , Multiple controls, microphones,data radio, Walkie talkie converters and it’s main application Professional Mobile Radio with a feature of selective calling.

Introduction
Mobile radio or mobiles refer to wireless communications systems and devices which are based on radio frequencies, and where the path of communications is movable on either end. There are a variety of views about what constitutes mobile equipment. For US licensing purposes, mobiles may include hand-carried, (sometimes called portable), equipment. An obsolete term is radiophone. Some mobile radios are mounted in aircraft, (aeronautical mobile), shipboard, (maritime mobile), on motorcycles, or railroad locomotives. Power may vary with each platform. For example, a mobile radio installed in a locomotive would run off of 72- or 30-volt DC power. A large ship with 117V AC power might have a base station mounted on the ship's bridge.

Disambiguation: Two-way versus telephone
The distinction between radiotelephones and two-way radio is becoming blurred as the two technologies merge. The backbone or infrastructure supporting the system defines which category or taxonomy applies. A parallel to this concept is the convergence of computing and telephones.
Radiotelephones are full-duplex (simultaneous talk and listen), circuit switched, and primarily communicate with telephones connected to the public switched telephone network. The connection sets up based on the user dialing. The connection is taken down when the end button is pressed. They run on telephony-based infrastructure such as AMPS or GSM.
Two-way radio is primarily a dispatch tool intended to communicate in simplex or half-duplex modes using push-to-talk, and primarily intended to communicate with other radios rather than telephones. These systems run on push-to-talk-based infrastructure such as Nextel's iDEN, Specialized Mobile Radio (SMR), MPT-1327, Enhanced Specialized Mobile Radio (ESMR) or conventional two-way systems. Certain modern two-way radio systems may have full-duplex telephone capability.


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projectsofme
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13-10-2010, 11:35 AM


.docx   Radio Communications System.docx (Size: 14.96 KB / Downloads: 98)
Radio Communications System

++++++++++++++++++++++++++++++++++++++++++++++
The Radio Communications System (RCS) consists of several exterior communications subsystems which, in combination, provide all exterior communications requirements for the ship with the exception of the Special Intelligence Communications requirements. The RCS subsystems are turnkey installations and consist of the following subsystems: High Frequency Communications System, Very High Frequency Communications (VHF Comms) System, Ultra High Frequency Line-of-Sight Communications (UHF LOS Comms) System, Ultra High Frequency Satellite Communications (UHF SATCOM) System, Extremely High Frequency Satellite Communications (EHF SATCOM) System, Super High Frequency Satellite Communications (SHF SATCOM) System, Communications Support Segment (CSS), Naval Modular Automated Communications System (NAVMACS) II, and the Bridge To Bridge Communications System.
The High Frequency Communications System consists of the High Frequency Radio Group (HFRG) is a fully automated subsystem of the external radio communications system (RCS) aboard surface ships. The HFRG operates in the Very Low Frequency (VLF), Low Frequency (LF), Medium Frequency (MF) and High Frequency (HF) frequency bands and supports full duplex, half duplex and simplex operation for tactical and long-haul voice, interrupted continuous-wave, teletype and digital data communications in the Lower Sideband (LSB), Upper Sideband (USB), Independent Sideband (ISB), Amplitude Modulation Equivalent (AME) and Link 11 modes of operation. The HFRG consists of three subsystems: the transmit subsystem, the receive subsystem and the control/monitor subsystem (CMS).
The Transmit Subsystem operates (in increments of 10 Hz) in the frequency range of 2 Mhz to 30 Mhz and is used primarily for broadband circuits. The Transmit subsystem is designed to allow all exciters to operate in the Link 11 mode, but contains the assets required to support two (2) 1kW narrowband circuits which are the primary HF Link 11 circuits.The operational capabilities of the transmit subsystem require both broadband and narrowband antennas. The operational configuration of the transmit subsystem is accomplished in response to commands from the CMS and frequency changes (except narrowband) are completed in less than 100 milliseconds. The transmit subsystem reports to the CMS when the system is configured and also reports detected failures.
The Receive Subsystem operates (in increments of 10 Hz) in the frequency range of 14 Khz to 1.619 Mhz and 2 Mhz to 30 Mhz. The receive subsystem requires at least two broadband antennas and 1 or 2 additional antennas dedicated to the use of the Ship Signal Exploitation Equipment (SSEE). The operational configuration of the receive subsystem is accomplished in response to commands from the CMS and frequency changes are completed in less than 20 milliseconds. The receive subsystem reports to the CMS when the system is configured and also reports detected failures.
The Control/Monitor Subsystem is the backup point of control for the HFRG when the system is being controlled by the Surface Ship Automated Communications Control System (SSACCS) (part of the Communications Support System (CSS)). The SSACCS normally controls the HFRG through an interface with the CMS, but if the SSACCS becomes inoperable the CMS automatically assumes the functions of remote control, performance monitoring, test, operator interface, and display of the operational characteristics. The CMS is used to send configuration commands to the transmit and receive subsystems and, in turn, receive configuration completion and operational characteristics from these subsystems.
The Very High Frequency Communications (VHF Comms) System is utilized to transmit and receive tactical, operational and administrative information (both voice and data) in the VHF range (30-300 MHz). The VHF Comms System primarily supports line-of-sight (LOS) communications between accomplishing units and is comprised of several different Radio Groups or subsystems. Most of the Radio Groups are functionally interchangeable and therefore are not individually dedicated to a specific circuit or function.
The Ultra High Frequency Line-of-Sight Communications (UHF LOS Comms) System is utilized to transmit and receive tactical, operational and administrative information (both voice and data) in the UHF range (300 MHz - 3 GHz). The UHF LOS Comms System is capable of operating in either the UHF LOS or UHF Satellite Communications (UHF SATCOM) mode. Most of the UHF LOS equipments are functionally interchangeable and therefore are not individually dedicated to a specific circuit or function.
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08-10-2012, 12:18 PM

to get information about the topic "Mobile Train Radio Communication" full report ppt and related topic refer the link bellow

topicideashow-to-mobile-train-radio-communication-download-full-seminar and presentation-report

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