Handbook of Intercom Systems Engineering
Fine Print
Table of Contents
Design of Party-Line
Design of Wireless
Introduction to Matrix
Determining Intercom Needs
Page
Page
List of Figures
Wireless Intercom Interfaced to Matrix Intercom
Preface
Page
About the Authors
Page
Introduction
Party-Line Systems
Wireless Systems
Matrix Systems
Accessories
Wireless Intercom Examples
Example of Interfacing a TW System to a Matrix System
Before We Begin
Matrix
Rest Of The Book
Tally
Party-Line PL systems / Conference Line Intercom Systems
Two-Wire
Some Definitions
Short History
Present Day Systems and Manufacturers
Brand Name Manufacturer
System Components and Their Function
Belt Pack Headset User Station Functional Description
Some Technical Notes About The Stations Above
Speaker User Station Functional Description
Master Stations
Five pin XLR
How Each System Works
Four pin XLR
Speaker User Stations
System Powering
Headset User Stations
Call Lights
Outstanding Features of Each System
Cabling
Limitations of Each System
Summary
Some Definitions
Short History
System Components and Their Function
How Each System Works
Outstanding Features of Each System
Limitations of Each System
Audiocom intercom concept
RTS TW intercom concept
Application 1 Generic Single Channel Systems
Overview
Defining And Meeting Your Needs
Audiocom Party-Line Intercom Equipment Listing #1
Generic single channel Audiocom system
Clear-Com Party-Line Intercom Equipment Listing #1
Generic single channel Clear-Comsystem
Application 2 Two-Channel System TV, School, Cable
RTS TW Party-Line Intercom Equipment Listing #1
Audiocom Party-Line Equipment Listing #2
Clear-Com Party-Line Equipment Listing #2
Application 3 Theater System
RTS TW Party-Line Equipment Listing #2
RTS TW Party-Line Equipment Listing #3
Audiocom Party-Line Equipment Listing #3
Clear-Com Party-Line Equipment Listing #3
Application 4 Training Systems
Audiocom
Clear-Com
Clear-Combased training intercom system
RTS TW
Application 5 Medium System for Television
Medium intercom system for television
IFB System One Way Communications System
How an IFB Works
Studio and Some Field Applications
Field Application, Sports
Connecting Interfacing to Other Communications Systems
Field Application, ENG Electronic News Gathering
Typical Interfacing Problem
Interfacing Issues
Level Problems
Signal / Data Conversion
Modes
Call Light
Alternatives for Interfacing to Television Cameras
Problems in Interfacing to Cameras
Interfacing Practice
Some Practical Considerations
Headset Cable Lengths
Wiring Practices/Workmanship Standards
Headphone Impedances
Extended Range On Part Or All Of The System
Unbalanced vs. Balanced
Cable Considerations
Crosstalk Through a Common Circuit Ground
Crosstalk Through a Mutual Capacitance Of Two Conductors
Low Crosstalk Approach To Interconnection
Cooling Requirements
Temperature Range Consideration
System Current/System Capacitances/Loading
Defining and Meeting Your Needs
Magnetic Fields Hum Problems
Moisture / Contamination Protection
Some Practical Considerations
Connecting Interfacing to Other Communications Systems
IFB System One Way Communications System
Page
Page
Introduction to Matrix Intercom Systems
Definitions
KP-32 is a good example of an advanced user station keypanel
History of Matrix Intercoms
Example of Matrix Ports
X X X X X X
Number of Users Number of Crosspoints
Page
Page
Modern Day Matrix Intercoms
Conventional Matrix vs. TDM Matrix
Configurability
Special Considerations
Advantages
Size
Ancillary Functions
Conference or PL described above
More Complex Ancillary Functions
Typical User Station Keypanel
Page
Complexity
Disadvantages
Cost
You are in your kitchen QUICK, multiply 347.2 times
Page
Page
Back-to-Basics
RTS Matrix Intercom Systems
Typical Adam Matrix Connections
To Begin
Let’s get started
Studio a
Floor
Control Room
Other
Page
Page
Cable Considerations
RJ12 Modular Plug
Polling Issues
Audio and Data Considerations
Very 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
Signal Formats
Interfacing
Interconnecting Matrix, PL, and Wireless Systems
TW and Matrix Signal Flows
10 Wireless Intercom Interfaced to Matrix Intercom
+ +
Software Considerations
12 TW to Matrix Interface
Adam and Adam CS Basic Components
Adam
Page
Introduction to Wireless Intercoms
History of Wireless Intercoms
Page
Modern Day Wireless Intercoms
First beltpack based wireless intercom system
An 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
An example of combining waves that are not 180 out of phase
Interference
3A 2B = C
2A B = C
+ C = D
10 Transmitter block diagram
Transmitters and Receivers
11 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
Installation
Coaxial Cable Loss Chart
Page
Page
Page
Determining Intercom Needs
Conference Versus Point-to-Point Requirements
Page
Fixed vs. Mobile Requirements
General Overview
Determining Intercom Needs, two-wire, four-wire, or both?
PS15 Power Supply/MCP2 Rack Kit
Small Studio or ENG Vehicle
MCE325 Modular Programmable Station
Headsets and Earsets not shown
Medium Sized Studio and Mobile Intercom
TW5W Splitter
IFB325 Talent User Station
Two-wire Case Medium Intercom
803-G1G5 Master Station
PS31 Power Supply
BOP220 Connector Translation Assembly
System Interconnect
SAP1626 Source Assign Panel
Four-wire Case Medium Intercom
Zeus DSP2400 Matrix
KP96-7 Keypanel
TIF-2000 Intelligent Telco Interface
MKP4-K Modular Keypanel
IFB828 IFB Power Supply
PS15 Power Supply
SSA324 System-to-System Adapter
SAP612 Source Assign Panel
Large Studio or Mobile Vehicle
Determining the Makeup of the Intercom Matrix
First Step--Determine the Size
Users
IFB Circuits
Miscellaneous
Second Step--Determine the Panels
Cameras
Other Considerations in Determining Intercom Needs
Maintenance
How old is Too Old?
Expandability
Interoperability
Budget
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