WiMax Explained; System Fundamentals Review

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(More customer reviews)I needed to get up to speed on WiMax and quick. I bought a few books but this one was clearly the best. It's a straight forward "explaination" of WiMax starting with "What is WiMax" to Service Flows.
It starts with technical information that I already understood and clearly added/combined/modified technical details to develop a logical and technical explaination of what WiMax. It's at the right technical level. It stops short of all the protocol details (however many of those are existing and I know them) that bogs down a lot of technical books. There's nothing worse than pay $50 for a book and getting 20 pages of overview and then 150 of standards which I could have gotten for free online.
This book definately gave me the right technical information sprinkled with illustrations that were SIMPLE to understand. The figures are clear and relate directly to the explainations. It saved me a lot of time by getting me up to speed quick so I now have a good understanding of the WiMax system.
One more praise for this book...The index is really well done. I'm not sure what it is, but when referring back to this book for information when I'm working, I find it easily in the index. They must be doing something right. Most technical books have me just flipping through the book to find information becuase the index doesn't help get you to the specific item you need.

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This book explains the functional parts of a WiMax system and its basic operation. You will learn how WiMax can use base stations to provide high speed data connections that can be used for voice, data and video services to distances of over 30 km. The original WiMax system was designed to operate at 10-66 GHz and it had to change to offer broadband wireless access (BWA) in the 2-11 GHz frequency range. To do this, the WiMax standard includes variants (profiles) that use different combinations of radio channel types (single carrier -vs- multicarrier), modulation types, channel coding types to provide fixed, nomadic or portable services.WiMax can provide multiple types of services to the same user with different QoS levels. For example, it is possible to install a single WiMax transceiver in an office building and provide real time telephone services and best effort Internet browsing services on the same WiMax connection. To do this, WiMax was designed to mix contention based (competitive access) and contention free (polled access) to provide services which have different quality of service (QoS) levels. You will learn about WiMax protocols and how they are designed to allow for point to point (PTP), point to multipoint (PMP) and mesh networks. Operators can use the mesh configuration to allow it to link base stations without the need to install or lease interconnecting communication lines. Some of the services WiMax operators can provide include leased line, residential broadband, commercial broadband and digital television (IPTV) services.WiMax can use radio channel bandwidths that can vary from 1.25 MHz to 28 MHz and data transmission rates can exceed 155 Mbps. The types of data connections on WiMax radio channels include basic (physical connection), primary (device control), secondary (configuration) and transport (user data).You will learn about the typical range for WIMAX systems and how to extend the range of WIMAX systems through the use of directional antennas. Some of the most important topics featured include:. The Functional Parts of WiMax Systems. Basic WiMax Operation. The Types of WIMAX Services. Data Transmission Rates. WIMAX Industry Standards. WIMAX Technology Evolution. Protocols Used in WiMax. Physical and Logical Channel Types. The Different Types of WIMAX Devices. Basic Security Operation

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Ham Radio For Dummies Review

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(More customer reviews)I am often asked why I am still interested in ham radio when it is so easy for people to communicate by e-mail and cellular phone. The answer, as is so forcefully brought home in this excellent book, is that ham radio is fun, challenging, rewarding, and provides opportunities for personal growth.
While the major objective of the book is to provide information to get newcomers into the hobby and to help get them productive and successful, there is something here that can be useful to even the most experienced operators. There are many ways people have found to enjoy the various technical, recreational, educational, and social aspects of ham radio. They are covered in this well-written book.
Ward is an operator of the first caliber. His advice is based upon personal experience, not based upon interpreting what some others person has told him. He is also a very funny person and he has a unique ability to find whatever humor exists in a situation. Therefore the tone of his book is light and eminently readable. More particularly, it does not suffer from the dry style that I found in similar books.
People who are interested in developing new skills, expanding their minds, and building relationships will find ham radio a great hobby. I recommend this book as a means of becoming successful quickly. Experienced hams will find hints that are more valuable than the modest cost of the book. Finally, those like me who were away from the hobby for a while will find a good summary of what they have missed while they were away.
A terrific read.

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It's time we cleared the air about ham radio. If you think of it as staticky transmissions sent by people in the middle of nowhere, think again. Today's ham radio goes beyond wireless to extreme wireless, Operators transmit data and pictures, use the Internet, laser, and microwave transmitters, and travel to places high and low to make contact. In an emergency or natural disaster, ham radio can replace downed traditional communication and save lives. Whether you're just getting turned on to ham radio or already have your license, Ham Radio for Dummies helps you with the terminology, the technology and the talknology. You discover how to:
Decipher the jargon and speak the language
Buy or upgrade your equipment, including the all-important antennas
Build a ham radio shack, complete with the rig, a computer, mobile/base rig, microphones, keys, headphones, antennas, cables and feedlines
Study for your license, master Morse code, take the test and get your call sign
Understand the basics of ragchews (conversations), nets (organized on-air meetings) and DX-ing (competing in contacts to make contacts)
Keeping logs with the vital statistics, including time (in UTC or World Time), frequency, and call sign

Written by Ward Silver, an electrical engineer, Certified Amateur Radio License Examiner, and columnist for QST, a monthly magazine for ham operators, Ham Radio for Dummies gives you the info you need to delve into the science or dive into the conversation. It explains how you can:
Tune in to the most common types of signals, including Morse Code (CW), single-sideband (SSB), FM, Radioteletype (RTTY), and data signals
Break in, introduce yourself, converse, and say or signal goodbye
Communicate while traveling (ham radio goes where mobile phones go dead)
Register with an emergency organization such as ARES and RACES
Help in emergencies such as earthquakes, wildfires, or severe weather
Pursue your special interests, including contacting distant stations, participating in contests, exploring the digital modes, using satellites, transmitting images, and more

Complete with a glossary and ten pages of additional suggested resources, Ham Radio for Dummies encourages you to touch that dial and take that mike.
CUL. (That's Morse Code for "see you later.”)

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