Presentation is loading. Please wait.

Presentation is loading. Please wait.

Existing VHF Systems: Already a problem

Published byStephanie Foster Modified over 7 years ago

Similar presentations

Presentation on theme: "Existing VHF Systems: Already a problem"— Presentation transcript:

1 Existing VHF Systems: Already a problem
Existing VHF Systems: Already a problem. Not able to use adjacent channels at close distances. 20KHz Bandwidth WideBand WideBand WideBand Overlap Overlap Adjacent channels 15KHz Channel Spacing 15KHz Channel Spacing Joe Kuran Oregon SIEC

2 After Narrowband: Still a problem Narrowband channels not usable until wideband users vacate.
20KHz Bandwidth 20KHz Bandwidth Wide Band Wide Band 20KHz Bandwidth Overlap Overlap Wide Band ANALOG NARROWBAND ANALOG NARROWBAND 7.5KHz Channel Spacing 11KHz Bandwidth Joe Kuran Oregon SIEC

3 After all convert to Narrowband Still some overlay with analog modulation .
This represents analog voice with a 11KHz necessary bandwidth ANALOG NARROWBAND ANALOG NARROWBAND ANALOG NARROWBAND ANALOG NARROWBAND ANALOG NARROWBAND 7.5KHz Channel Spacing 11KHz Bandwidth Joe Kuran Oregon SIEC

4 Convert to Project 25 Digital Phase I Digital Modulation allows tighter packing of channels Still a very minor overlay in the VHF band UHF band will have no overlay because of 12.5KHz Channel Spacing. P25 with C4FM Modulation only requires 8.1KHz Necessary Bandwidth DIGITAL NARROWBAND DIGITAL NARROWBAND DIGITAL NARROWBAND DIGITAL NARROWBAND DIGITAL NARROWBAND 8.1KHz Bandwidth 7.5KHz Channel Spacing Joe Kuran Oregon SIEC

Download ppt "Existing VHF Systems: Already a problem"

Similar presentations

Voice/IP Geoff Huston Internet Society. Voice and Data Analog voice transmission has dominated the communications industry for the past 100 years The.

Voice/IP Geoff Huston Internet Society. Voice and Data Analog voice transmission has dominated the communications industry for the past 100 years The.
1.  The Australian Radio Communications Industry Association represents some 300 commercial entities including approximately 1500 industry professionals.

1.  The Australian Radio Communications Industry Association represents some 300 commercial entities including approximately 1500 industry professionals.
CMP206 – Introduction to Data Communication & Networks Lecture 2 – Signals.

CMP206 – Introduction to Data Communication & Networks Lecture 2 – Signals.
Wireless Modems Dan Tolley Director of Business Development ESTeem Wireless Modems Wireless Business Opportunities from the FCC Narrowband Mandate.

Wireless Modems Dan Tolley Director of Business Development ESTeem Wireless Modems Wireless Business Opportunities from the FCC Narrowband Mandate.
What is Narrowbanding? FCC mandated process to require a channel efficiency of 1 voice channel per 12.5 kHz of spectrum for all users operating between.

What is Narrowbanding? FCC mandated process to require a channel efficiency of 1 voice channel per 12.5 kHz of spectrum for all users operating between.
SCIP Conference Austin, Texas August 24, 2010. Migrating to Narrowband On July 2, 1991, The Commission released a Notice of Inquiry to gather information.

SCIP Conference Austin, Texas August 24, Migrating to Narrowband On July 2, 1991, The Commission released a Notice of Inquiry to gather information.
MOTOROLA and the Stylized M Logo are registered in the US Patent and Trademark Office. All other product or service names are the property of their respective.

MOTOROLA and the Stylized M Logo are registered in the US Patent and Trademark Office. All other product or service names are the property of their respective.
ANGLE MODULATION AND DEMODULATION

ANGLE MODULATION AND DEMODULATION
CAR/SAM GNSS/ATN SeminarFrequency planning criteriaPage 1 GROUND BASED AUGMENTATION SYSTEM Frequency Planning Criteria Presentation GNSS 3.3 by Christophe.

CAR/SAM GNSS/ATN SeminarFrequency planning criteriaPage 1 GROUND BASED AUGMENTATION SYSTEM Frequency Planning Criteria Presentation GNSS 3.3 by Christophe.
V.90 Modems Telephone Bandwidth is Limited (Chapter 4) –Bandwidth limits speed –Limits speed to about 35 kbps –When you transmit, limited to 35 kbps 35.

V.90 Modems Telephone Bandwidth is Limited (Chapter 4) –Bandwidth limits speed –Limits speed to about 35 kbps –When you transmit, limited to 35 kbps 35.
4. Cellular Systems: Multiple Access and Interference Management Fundamentals of Wireless Communication, Tse&Viswanath 1 4. Cellular Systems: Multiple.

4. Cellular Systems: Multiple Access and Interference Management Fundamentals of Wireless Communication, Tse&Viswanath 1 4. Cellular Systems: Multiple.
Copyright 2005 - 2009: Hi Tech Criminal Justice, Raymond E. Foster Police Technology Police Technology Chapter Three Police Technology Wireless Communications.

Copyright : Hi Tech Criminal Justice, Raymond E. Foster Police Technology Police Technology Chapter Three Police Technology Wireless Communications.
Which telecommunication service is better for you?

Which telecommunication service is better for you?
Copyright © 2003, Dr. Dharma P. Agrawal and Dr. Qing-An Zeng. All rights reserved. 1 Chapter 7 Multiple Division Techniques.

Copyright © 2003, Dr. Dharma P. Agrawal and Dr. Qing-An Zeng. All rights reserved. 1 Chapter 7 Multiple Division Techniques.
Modulation is the process of conveying a message signal, for example a digital bit stream or an analog audio signal, inside another signal that can be.

Modulation is the process of conveying a message signal, for example a digital bit stream or an analog audio signal, inside another signal that can be.
Public Safety Radio Bands VHF-Low Band: 25 MHz to 50 MHz VHF-High: 138 MHz to 174 MHz UHF: 408 MHz to 512 MHz 700 MHz (new) 800 MHz 4.9 GHz (new)

Public Safety Radio Bands VHF-Low Band: 25 MHz to 50 MHz VHF-High: 138 MHz to 174 MHz UHF: 408 MHz to 512 MHz 700 MHz (new) 800 MHz 4.9 GHz (new)
5.1 Chapter 5 Analog Transmission Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

5.1 Chapter 5 Analog Transmission Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
NARROW-BANDING UPDATE Timeframe and Issues 1. Topics  Background  Situation  Implications to Agencies  Implications to Statewide Mutual Aid 2.

NARROW-BANDING UPDATE Timeframe and Issues 1. Topics  Background  Situation  Implications to Agencies  Implications to Statewide Mutual Aid 2.
For the Public Safety Community

For the Public Safety Community
Narrowband Basics For the Wildland Firefighter Community November 11, 2005.

Narrowband Basics For the Wildland Firefighter Community November 11, 2005.

Similar presentations

Ads by Google