Build Your Own Low-Power Transmitters

Butterworth-Heinemann | ISBN-13: 9780750672443 | English | PDF | 305 Pages | RAR Compressed 7.82 MB | No Password 

Introduction
Rudolf Graf and William Sheets have written a book containing twenty low-power (LP) transmitter projects, perfect for the electronics hobbyist and radio experimenter. Now that the FCC has changed its regulations about "pirate" transmissions, more and more people are setting up radio and video stations for broadcast from their homes. Build Your Own Low-Power Transmitters addresses applications for hobbyist broadcasting of AM, SSB, TV, FM Stereo and NBFM VHF-UHF signals with equipment the reader can build himself for thousands of dollars less than similar equipment sold on the retail market. The authors also fully explore the legal limits and ramifications of using the equipment as well as how to get the best performance for optimum range. The key advantage is referencing a low-cost source for all needed parts, including the printed circuit board, as well as the kit.

Table Of Contents

Preface
1 Low-Power Transmitters, General 1
2 Basic Building Blocks 9
3 Simple Low-Power Transmitters for Experimenters 23
4 50 mW VFO-Controlled AM Transmitter for 530-1710 kHz 31
5 PLL Synthesized AM Transmitter for 530-1710 kHz 35
6 VFO Controlled FM Monaural Transmitter for 88-108 MHz 55
7 Basic FM Stereo Signal Generation Techniques 61
8 PLL Synthesized FM Stereo Transmitter for 88-108 MHz 69
9 Microprocessor-Controlled FM Stereo Transmitter for 88-108 MHz 93
10 20 mW Low-Power TV Transmitter 117
11 0.5-Watt TV Transmitter for R/C Vehicles 121
12 2-Watt TV Transmitter for R/C and Amateur TV for 400 MHz 131
13 1-Watt TV Transmitters for 902-928 MHz and 1240-1300 MHz 147
14 Experimental 20 mW 915 MHz PLL FM TV Transmitter 163
15 Receiving Converters and IF Systems for Low-Power ATV Transmitters
171
16 Low-Power Narrowband FM Audio Transmitters 215
17 Serial Data Transmit-Receive System for Remote Control 223
18 RF Field-Strength Meter for 500 kHz to 3 GHz Transmitter 233
19 Low-Power CW Transmitter for 40 Meters 247
20 Single Sideband Basics 253
21 Basic Single Sideband Generator/Exciter Unit 261
22 1-Watt CW Transmitter for the 1750-Meter "LOWFER" Band 267
23 Simple CW Identifier 273
Appendix 281

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Making Your Own Telescope

Sky Publishing Corporation | ISBN: 0-486-42883-4 | English | PDF | 221 Pages | Size: 8.64 MB

Introduction
IN 1934, A SMALL GROUP OF YOUNG MEN, imbued with a mutual interest in astronomy and a curiosity about the tools of the astronomer, organized themselves into the New York Telescope Makers Association. With the erection of the Hayden Planetarium in 1935, a new focal point of astronomical interest was created for the New York metropolitan area. Shortly thereafter the telescope making group became a part of the Amateur Astronomers Association, an organization now of about 500 members, sponsored since 1927 by the American Museum of Natural History. Facilities and space for the telescope makers were provided in the basement of the Planetarium, where they began activities as the Optical Division of the Amateur Astronomers Association. As such I learned of the group and was privileged to become a member.

The Optical Division presently undertook classes in telescope mirror making, an activity which had been expanding from earlier beginnings at the Museum. With the advent of the war and the absence of some of our most skilled and active members, your author was asked to assist in carrying on with the teaching program, and has continued in this capacity to the present time. In these classes, numerous problems arose that interest but perplex the tyro concerning the telescope and its parts, its functions and its optics, its capabilities and its limitations, and other related matters. The answers to many of these problems are as widely dispersed as amateur astronomers themselves, and are probably not to be found in any single volume in the consecutive and integrated arrangement which would be most useful to the beginner. Hundreds of mirrors in various stages of incompletion, made by amateurs working independently at home, have been brought to the author to have their ills analyzed. In the light of these experiences, it seemed that the sort of service and instruction rendered at the Planetarium might woIthily be made available to a greater number of amateurs. Accordingly, a series of articles on telescope making was prepared, and published in Sky and Telescope. These articles were received with much favorable mention, and it was therefore decided to expand and publish them in book form. And so this volume was born. In it the author has attempted to guide the novice past those pitfalls and snares into which the untutored worker is likely to stumble. Some new techniques are described, enabling excellent optical surfaces to be fashioned in a shorter time than heretofore generally required. The other par.ts of the telescope have not been neglected, and considerable study is devoted to the design of the various supporting parts. Descriptions of simple pipe mountings of proven efficiency are included. Endeavor has also been made to supply the answers to many questions not elsewhere treated. Some of the diagrams previously used have been redrawn and the number of illustrations has been more than doubled. We are indebted to Earle B. Brown, an associate in the Optical Division, who read the original manuscript of the Sky and Telescope 
series, and made many corrections and valuable suggestions. Acknowledgment must also be made to Charles and Helen Federer for their patient help in the arrangement of the material and for the order of presentation. An expression of gratefulness is also made to the Amateur Astronomers Association and its officers, and the members of the Optical Division, all of whom by their interest and active support have helped make this book possible.

ALLYN J. THOMPSON

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365 Steps to Self Confidence

How To Content | ISBN: 978-1-84803-210-1 | English | PDF | 225 Pages | RAR Compressed 1.59 MB | No Password 

Introduction
r16;A man who doubts himself is like a man who enlists in the ranks of the enemy and bears arms against himself. He makes his failure certain by being the first to be convinced of it.r17;
Alexandre Dumas

CONFIDENCE IS CRUCIAL TO A HAPPY AND FULFILLING LIFE. It influences your success at work, your family life, relationships and leisure activities. It affects your performance in everything you do. A belief in oneself is without doubt the greatest asset of all. Even great wealth and fame canr17;t compensate for a poor self-image.

People who lack confidence and self-belief always underachieve. Theyr17;re less adventurous and less likely to get the most out of life. Theyr17;re more prone to a variety of stress-related problems, including anxiety, eating disorders and mental health problems. Low self-esteem is the fundamental cause of most family breakups, poor parenting and relationship problems. In addition, much crime is associated with drug abuse, unemployment, poverty and aimlessness, all of which are related to low self-esteem.

Does lack of confidence hold you back? If so, your17;ve made a wise purchase. 365 Steps to Self Confidence has been carefully structured to help you become more confident. It takes you deep inside your mind and gives you tools and techniques which have worked for millions of people around the world. All you have to do is to work through and apply its lessons. 

Time and energy devoted to building your confidence and self-esteem are nothing less than investments in your whole life. The exciting thing is, no matter what your history, background or current state of confidence, you r11; we all r11; can learn to be confident, because itr17;s never too late.

About this book
I have written this book for everyone r11; young and old, men, women, students, educators, business people, administrators, parents, homemakers, sports enthusiasts, entertainers r11; yes, and you!

It has been carefully structured into 52 sections, covering the following areas:
1.Deciding to be confident
2.Self-awareness
3.Thinking confidently
4.Using your imagination to improve self-image
5.Acting with confidence
6.Confident communication.
Each section contains information, insights and words of inspiration, plus seven exercises, practical hints or points to ponder. Thatr17;s one a day r11; not too taxing. is it? I guarantee that if you read the material carefully and apply what you learn, your17;ll notice big changes taking place within two or three months, and a year from now your17;ll look back amazed at how much more confident your17;ve become. 

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