The Global Positioning System (GPS) is a satellite-based, radio navigation system. GPS devices have become commonplace in consumer electronics. GPS units and GPS technology is used in our cars, on our boats, in cell phones, in our personal computers and PDAs. GPS has improved the way we navigate, communicate, and move about the planet.

With this book, you’ll explore GPS: its history, how it works, and navigating with a GPS receiver. We’ll also examine how Amateur Radio operators (or “hams”) have made use of GPS technology. A popular ham radio application is in the Automatic Position Reporting System, or APRS*. By connecting inexpensive GPS receivers to their radio gear, hams transmit their positions and other information, which is then displayed on maps at the receiving stations. The result is an effective method of direction finding for public service activities such as search-and-rescue—and for fun!

*APRS® is a registered trademark of Bob Bruninga, WB4APR.

© 2007, The American Radio Relay League, Inc.

Today's Amateur Radio operators are using digital radio applications for fun, technical achievement, and public service. And it’s no wonder. Getting started often requires little more than a VHF radio and a computer.

Without complicated “owners manual” jargon—ARRL’s VHF Digital Handbook presents the material through a unique how-to approach and friendly, conversational style. Readers will understand how to setup and operate their equipment and software, and make the best use of their VHF digital station.

Contents:

• Packet Radio Fundamentals: All the basics including TNCs, operating commands, and networks (such as DX Packetcluster).
• APRS – The Automatic Position Reporting System: Track moving objects on maps (other stations, public service vehicles, marathon runners, etc.). Connect your own GPS receiver and transmit your location even as you’re moving!
• D-STAR: Enjoy high-speed digital voice and data on the growing network of D-STAR repeaters.
• High Speed Multimedia: Discover how you can set up your own wireless Amateur Radio data network by modifying over-the-counter gear such as routers and access points. It’s ham WiFi consumers can only dream about!
• Digital Meteor Scatter and Moonbounce: Explore weak signal operating using the software masterpiece WSJT by Joe Taylor, K1JT.
• Technical Descriptions: In-depth information about AX.25, D-STAR and APCO-25 protocols.
• Plus, digital applications in public service and emergency communications: Packet radio, APRS, Winlink 2000 and more!

First edition. © 2008, The American Radio Relay League, Inc.

In this course, we will introduce you to all the ways Amateur Radio operators are using digital technology as a valuable emergency communications tool. The topics discussed during the course include:

• Packet radio APRS
• Winlink 2000
• IRLP
• EchoLink and WIRES-II
• D-STAR
• APCO25
• HF sound card modes
• Automatic Link Establishment (“ALE”)

We’ll help you answer questions such as:
Can you transfer supply lists or personnel assignments between emergency operations sites?
Can you get critical e-mails to the Internet if a connection goes down?
Can you relay digital images of damage at specific locations?
Can you track the locations of emergency personnel and display them on computer maps?
…and more!

Illustrations, screenshots, Internet links and audio files are used to demonstrate transmission modes and equipment configurations. Bite-sized learning units and interactive knowledge checks make learning interesting and fun!

System Requirements (minimum) – Microsoft Windows® Vista/XP/2000/NT/98/95 or Apple OS X, 200 MHz processor, 32 MB RAM, sound card and speakers, 4-speed CD-ROM drive or higher. Requires Web browser; Microsoft Internet Explorer™ 6.0, Mozilla Firefox 2.0, Apple Safari 3.0—or later versions. Some documents require Adobe® Acrobat® Reader®.

Also available: ARRL's HF Digital Handbook

See supplemental material and product support for The ARRL Digital Technology for Emergency Communications Course.

Self-study. CD-ROM, version 1.1. © 2008, The American Radio Relay League, Inc.

Quick access to utilities, applications and information: