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** AND ELECTROMAGNETIC COMPATIBILITY.
**

How to make fast, accurate R.F. computations without a calculator.

Because of their logarithmic nature, it is very easy to make mistakes when performing Electromagnetic Compatibility and R.F. calculations, even when using a calculator. This workbook will provide you with a skill that is normally found only among the most experienced RF and microwave engineers: the ability to perform the most commonly needed RF calculations quickly and accurately, without a calculator, using the techniques of mental arithmetic.

Calculators can be accurate to a fraction of a dB, yet with one wrong stroke you can come up with an answer that is off by a factor of ten or more. The techniques presented in this book are actually faster than a calculator, but may only be accurate within 1 or 2 dB. The estimate is good enough for most situations, and for most certification tests.

These easily-mastered techniques provide a crucial reality check against the answers produced by your calculator.

After reading this book, you will be able to quickly answer questions like:

[without using a calculator]

" About 40 microvolts in a 50 Ohm system."

You will be able to make those conversions quickly and accurately, every time.

February 1999: 112 pages. © Copyright 1999 by TEMPEST INC. all rights reserved.

Library of Congress Catalog Card Number: 99-90078

ISBN O-9706415-1-6

Price: $150. plus $10 for nationwide delivery by Federal Express Ground Service.

Virginia Residents: Price includes Virginia sales tax.

For customers outside of the United States:

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Quantity discounts are available, but we accept no returns.

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TEMPEST INC.

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Reston, Virginia 20190

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Detailed information about "PROBLEMS AND SOLUTIONS IN WIRELESS COMMUNICATIONS AND ELECTROMAGNETIC COMPATIBILITY":

" PROBLEMS AND SOLUTIONS IN WIRELESS COMMUNICATIONS AND ELECTROMAGNETIC COMPATIBILITY " is designed to be an independent home study course. Using traditional techniques of mental arithmetic, "PROBLEMS AND SOLUTIONS IN WIRELESS COMMUNICATIONS AND ELECTROMAGNETIC COMPATIBILITY" gradually and easily trains the reader to perform the most commonly needed conversions, including decibel conversions ( dB conversions ) that come up in wireless communications engineering, electromagnetic interference (EMI, electromagnetic compatibility (EMC), and electromagnetic environmental effects ( E3 ). using a few standard, proven techniques of mental arithmetic.

" PROBLEMS AND SOLUTIONS IN WIRELESS COMMUNICATIONS AND ELECTROMAGNETIC COMPATIBILITY " is not limited to teaching decibel conversions (dB conversions).

" PROBLEMS AND SOLUTIONS IN WIRELESS COMMUNICATIONS AND ELECTROMAGNETIC COMPATIBILITY " begins with easily mastered exercises that employ simple, useful mental arithmetic techniques for converting frequency to wavelength and wavelength back to frequency, using both the metric and the English (U.S.) systems, quickly and accurately with no need of a calculator, nor even of a pencil and paper.

A sample problem would be "what is the approximate wavelength, in feet, of a 400 MHz signal travelling throough free space? The answer, in under 5 seconds, is 2 1/2 feet.

Although these problems do not involve advanced calculus or Maxwell's equations, in the practical working world it is often important to be able to do these "easy" problems quickly, and to be right 100% of the time. On licensing and certification tests, where time is limited, your test-taking skills can be as important as your knowledge. Skills like these often make the difference between passing and failing.

Once the reader has been made comfortable with a few basic techniques of mental arithmetic, " PROBLEMS AND SOLUTIONS IN WIRELESS COMMUNICATIONS AND ELECTROMAGNETIC COMPATIBILITY " proceeds to the slightly harder tasks of converting decibels referenced to one milliwatt ( dBm ) to decibels referenced to one microvolt ( dBuV ) in a 50 ohm system, and of the reverse: converting decibels referenced to one microvolt ( dBuV ) to decibels referenced to one milliwatt ( dBm ) in a 50 ohm system.

These simple conversion problems are the sources of a surprising number of errors, both on certification tests and in practice. " PROBLEMS AND SOLUTIONS IN WIRELESS COMMUNICATIONS AND ELECTROMAGNETIC COMPATIBILITY " presents techniques that will help avoid these very common but preventable errors.

" PROBLEMS AND SOLUTIONS IN WIRELESS COMMUNICATIONS AND ELECTROMAGNETIC COMPATIBILITY " then proceeds with the very commonly needed decibel conversions (dB conversions), beginning with the conversions of decibels referenced to one microvolt ( dBuV ) to microvolts, and the reverse: conversions of microvolts ( uV) to decibels referenced to one microvolt ( dBuV .) Once these have been thoroughly mastered, " PROBLEMS AND SOLUTIONS IN WIRELESS COMMUNICATIONS AND ELECTROMAGNETIC COMPATIBILITY " goes on to show how to convert Megahertz ( MHz ) to decibels referenced to one Megahertz (dBMHz ) and its reverse, the conversion from decibels referenced to one Megahertz (dBMHz ) to Megahertz (MHz).

This leads to the next topic: the conversions from broadband units, such as microvolts per megaherts (uV/MHz) to microvolts and, for field strength, the conversion from microvolts per megahertz per meter ( uV/MHz/m ) to microvolts per meter ( uV/m ).

Once this has been explained thoroughly with many worked out examples, " PROBLEMS AND SOLUTIONS IN WIRELESS COMMUNICATIONS AND ELECTROMAGNETIC COMPATIBILITY " then proceeds then proceeds to do these conversions in decibels: converting decibels referenced to one microvolt per megahertz ( dBuV/MHz ) to decibels referenced to one microvolt ( dBuV ) and, for field strength, the conversions from decibels referenced to one microvolt per megahertz per meter ( dBuV/MHz/m )to decibels referenced to one microvolt per meter (dBuV/m).

For completeness, " PROBLEMS AND SOLUTIONS IN WIRELESS COMMUNICATIONS AND ELECTROMAGNETIC COMPATIBILITY " then covers the conversion from antenna input voltage (Volts) to field strength ( volts per meter, V/m .) and from decibels referenced to one microvolt, dBuV , to decibels referenced to one microvolt per meter, dBuV/m .

"PROBLEMS AND SOLUTIONS IN WIRELESS COMMUNICATIONS AND ELECTROMAGNETIC COMPATIBILITY" concludes this section with the conversions from field strength in Volts per meter, V/m , to antenna output voltage, V. and, in decibels, from decibels referenced to one microvolt per meter, dBuV/m , to decibels referenced to one microvolt, dBuV .

"PROBLEMS AND SOLUTIONS IN WIRELESS COMMUNICATIONS AND ELECTROMAGNETIC COMPATIBILITY" ends with a simple and easily understood derivation explanation of an often-asked question about decibels: "Why is 20 Log [voltage ratio] but only 10 Log [power ratio] ?" This is a handy tool for engineering managers and instructors.

You will need a knowledge of basic electronics but not an engineering degree to understand " PROBLEMS AND SOLUTIONS IN WIRELESS COMMUNICATIONS AND ELECTROMAGNETIC COMPATIBILITY ." Even engineers with advanced degrees will find this practical book to be a very useful tool.

" PROBLEMS AND SOLUTIONS IN WIRELESS COMMUNICATIONS AND ELECTROMAGNETIC COMPATIBILITY " is different from many textbooks in that it contains a large number of problems, followed by their solutions. The solutions are "clean." By eliciting the aid of the initial group of readers, the minor errors that inevitably occur when compiling a very large body of worked-out problems like this one have been found and eliminated.

For engineering managers who must get their employees through certain licensing or certification tests, (such as the Electromagnetic compatibility engineers certification test ) " PROBLEMS AND SOLUTIONS IN WIRELESS COMMUNICATIONS AND ELECTROMAGNETIC COMPATIBILITY " will be worth many times its cost.