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Telex 38109-977 manual Handbook of Intercom Systems Engineering

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HANDBOOK OF INTERCOM SYSTEMS ENGINEERING

FIRST EDITION

38109-977 Preliminary Rev. 4, 3/2002

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Telex 38109-977 manual Handbook of Intercom Systems Engineering

Contents

Handbook of Intercom Systems Engineering Fine Print Table of Contents Design of Party-Line Introduction to Matrix Design of WirelessDetermining Intercom Needs Page Page List of Figures Wireless Intercom Interfaced to Matrix Intercom Preface Page About the Authors Page Party-Line Systems IntroductionMatrix Systems Wireless SystemsWireless Intercom Examples AccessoriesExample of Interfacing a TW System to a Matrix System Matrix Before We BeginTally Rest Of The BookSome Definitions Two-WireParty-Line PL systems / Conference Line Intercom Systems Short History Brand Name Manufacturer Present Day Systems and ManufacturersSystem Components and Their Function Belt Pack Headset User Station Functional Description Master Stations Speaker User Station Functional DescriptionSome Technical Notes About The Stations Above Four pin XLR How Each System WorksFive pin XLR Headset User Stations System PoweringSpeaker User Stations Cabling Outstanding Features of Each SystemCall Lights Summary Limitations of Each SystemSome Definitions Short HistoryHow Each System Works System Components and Their FunctionLimitations of Each System Outstanding Features of Each SystemAudiocom intercom concept RTS TW intercom concept Defining And Meeting Your Needs OverviewApplication 1 Generic Single Channel Systems Generic single channel Audiocom system Audiocom Party-Line Intercom Equipment Listing #1Generic single channel Clear-Comsystem Clear-Com Party-Line Intercom Equipment Listing #1RTS TW Party-Line Intercom Equipment Listing #1 Application 2 Two-Channel System TV, School, CableClear-Com Party-Line Equipment Listing #2 Audiocom Party-Line Equipment Listing #2RTS TW Party-Line Equipment Listing #2 Application 3 Theater SystemClear-Com Party-Line Equipment Listing #3 Audiocom Party-Line Equipment Listing #3RTS TW Party-Line Equipment Listing #3 Audiocom Application 4 Training SystemsClear-Combased training intercom system Clear-ComRTS TW Medium intercom system for television Application 5 Medium System for TelevisionHow an IFB Works IFB System One Way Communications SystemStudio and Some Field Applications Field Application, SportsField Application, ENG Electronic News Gathering Connecting Interfacing to Other Communications SystemsInterfacing Issues Typical Interfacing ProblemSignal / Data Conversion Level ProblemsModes Call LightInterfacing Practice Problems in Interfacing to CamerasAlternatives for Interfacing to Television Cameras Headset Cable Lengths Some Practical ConsiderationsHeadphone Impedances Wiring Practices/Workmanship StandardsExtended Range On Part Or All Of The System Unbalanced vs. BalancedCrosstalk Through a Common Circuit Ground Cable ConsiderationsCrosstalk Through a Mutual Capacitance Of Two Conductors Low Crosstalk Approach To InterconnectionSystem Current/System Capacitances/Loading Temperature Range ConsiderationCooling Requirements Moisture / Contamination Protection Magnetic Fields Hum ProblemsDefining and Meeting Your Needs IFB System One Way Communications System Connecting Interfacing to Other Communications SystemsSome Practical Considerations Page Page Definitions Introduction to Matrix Intercom SystemsKP-32 is a good example of an advanced user station keypanel Example of Matrix Ports History of Matrix IntercomsX X X X X X Number of Users Number of Crosspoints Page Page Conventional Matrix vs. TDM Matrix Modern Day Matrix IntercomsSpecial Considerations ConfigurabilityAdvantages SizeConference or PL described above Ancillary FunctionsTypical User Station Keypanel More Complex Ancillary FunctionsPage Cost DisadvantagesComplexity You are in your kitchen QUICK, multiply 347.2 times Page Page RTS Matrix Intercom Systems Back-to-BasicsTypical Adam Matrix Connections Let’s get started To BeginStudio a FloorOther Control RoomPage Page RJ12 Modular Plug Cable ConsiderationsAudio and Data Considerations Polling IssuesVery Large Systems, Split Operation and Trunking A Comparison of Relative System Sizes Separate Studios, Separate Intercom Fixed Trunking Page Independent Matrices in 2 Studios Page Cascaded Trunking Interfacing Signal FormatsTW and Matrix Signal Flows Interconnecting Matrix, PL, and Wireless Systems10 Wireless Intercom Interfaced to Matrix Intercom + + 12 TW to Matrix Interface Software ConsiderationsAdam and Adam CS Basic Components Adam Page History of Wireless Intercoms Introduction to Wireless IntercomsPage First beltpack based wireless intercom system Modern Day Wireless IntercomsAn example of a modern day wireless intercom system Page Ntsc Channel Configuration Chan Start Video Chroma Audio Chan Start Video Chroma Audio Page Page Design of Wireless Intercom Systems Field An example of wireless transmission and reception An example of reflected RF waves Waves that are in phase combine to form a larger wave Interference An example of combining waves that are not 180 out of phase+ C = D 2A B = C3A 2B = C Transmitters and Receivers 10 Transmitter block diagram11 Receiver block diagram 12 Good linearity is a must for faithful signal reproduction Antenna & Cable Considerations Page 14 An example of a Yagi antenna Page Coaxial Cable Loss Chart InstallationPage Page Page Conference Versus Point-to-Point Requirements Determining Intercom NeedsPage General Overview Fixed vs. Mobile RequirementsPS15 Power Supply/MCP2 Rack Kit Determining Intercom Needs, two-wire, four-wire, or both?Small Studio or ENG Vehicle MCE325 Modular Programmable StationMedium Sized Studio and Mobile Intercom Headsets and Earsets not shownTW5W Splitter IFB325 Talent User Station803-G1G5 Master Station Two-wire Case Medium IntercomBOP220 Connector Translation Assembly PS31 Power SupplySystem Interconnect SAP1626 Source Assign PanelFour-wire Case Medium Intercom KP96-7 Keypanel Zeus DSP2400 MatrixTIF-2000 Intelligent Telco Interface MKP4-K Modular KeypanelPS15 Power Supply IFB828 IFB Power SupplySSA324 System-to-System Adapter SAP612 Source Assign PanelLarge Studio or Mobile Vehicle First Step--Determine the Size Determining the Makeup of the Intercom MatrixUsers IFB CircuitsCameras Second Step--Determine the PanelsMiscellaneous Other Considerations in Determining Intercom Needs How old is Too Old? MaintenanceExpandability InteroperabilityBudget Glossary AWG O s s a r y CCU CPS Crosstalk Current Current Sources DSP EFP EIA GND Gpio Green Room Ground Ground Loop Potential Ibew IFB IR Drop Isolation Light Signaling Limiter Line Line Level Matrix Maximum SPL Mho Mic Micro µ Microcontroller NAB Nabet NEC Nema PLL PZM RFI RMS Smpte SPL O s s a r y Symbol for the unit of power, the watt Index IFB ISO STL VHF