Portable Wire Antennas

Author: John W. Hill
Publisher: Clear Springs Press
ISBN: 9781884979132
Format: PDF, Mobi
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This is not a book on antenna theory. It does provide clear easily understood explanations on the principles of antenna operation, transmission line considerations, impedance matching, baluns, tuners, and the pros and cons of different types and configurations of wire antennas. This book is written with the intention of enabling a new comer to amateur radio to understand the theory and practical considerations of this subject without getting lost in mathematics and complex theory. Portable, reliable HF communication is required for emergency management, expedition communications and recreational uses. This book is about selecting and constructing portable HF wire antennas that will provide maximum performance with low power, light weight and low bulk. All the information required to assemble antennas and antenna kits that can be deployed in multiple configurations is provided. Special attention is given to wire antennas deployed at low heights above ground, a situation confronted by operators on the move. Special attention is also given to NVIS (Near Vertical Incident Skywave) communications, which is also optimum with low antenna elevation. NVIS propagation enables communications in the 50-500 mile range regardless of terrain and independent of repeaters. With two or three low suspension points (8-20 ft.), one can deploy wire antennas that cover the 160-30 meter bands (those capable of NVIS propagation) with performance optimized for NVIS communication. With a single high suspension point that can be improvised from one or two tall trees, buildings or cliff faces and one of the antenna launch systems described here, one can deploy multiple antenna options that can be configured from the modular antenna kit. These include inverted V resonant or random wire dipoles, long wire antennas, sloper dipoles and inverted L antennas for efficient all-band regional use. It also covers terminated V beam and inverted half rhombic beam antennas optimized for 20-10 meters while being broad band (no tuner required), low noise gain equal to or greater than a high dipole. With two medium to high suspension points (15-80 ft. depending on the band), one can install half square wire antennas that produce high gain low angle radiation that is optimum for DX operation. Dropping one of the wire curtains converts the same antenna into a general coverage multi-band inverted L. With the versatility of the modular antenna components described here, one can quickly assemble, deploy and dis-assemble and roll up high performance wire antennas that are adaptable to nearly any operating environment and communications objective.

The Electronics of Radio

Author: David Rutledge
Publisher: Cambridge University Press
ISBN: 9780521646451
Format: PDF, Docs
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This fascinating book provides a stimulating introduction to analog electronics by analysing the design and construction of a radio transceiver. Essential theoretical background is given along with carefully designed laboratory and homework exercises. The author begins with a thorough description of basic electronic components and simple circuits and goes on to describe the key elements of radio electronics, including filters, amplifiers, oscillators, mixers, and antennas. Laboratory exercises lead the reader through the design, construction, and testing of a popular radio transceiver (the NorCal 40A). A diskette containing the widely known circuit simulation software, Puff, is included in the book. This was the first book to deal with elementary electronics in the context of radio. It can be used as a textbook for introductory analog electronics courses, for more advanced undergraduate classes on radio-frequency electronics, and will also be of great interest to electronics hobbyists and radio enthusiasts.

The World of Ham Radio 1901 1950

Author: Richard A. Bartlett
Publisher: McFarland
ISBN: 1476612609
Format: PDF, Mobi
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"Wonderful book...a welcome and long-overdue addition."--Communication Booknotes Quarterly. During the first fifty years of the twentieth century, ham radio went from being an experiment to virtually an art form. Because of the few government restrictions and the low monetary investment required, the concept of ham radio appealed to various people. More than just a simple hobby, however, ham radio required its operators to understand radio theory, be able to trace a schematic and know how to build a transmitter and receiver with whatever material they might have available. With the advent of World War II and the increased need for cutting-edge communications, the United States government drew upon the knowledge and skill of these amateur ham radio operators. This book explores the history of ham radio operators, emphasizing their social history and their many contributions to the technological development of worldwide communications. It traces the concept of relays, including the American Radio Relay League, from contacts as close as 25 miles apart to operators anywhere in the world. The book highlights the part played by ham radio in many of the headline events of the half century, especially exploration and aviation "firsts". The ways in which these primarily amateur operators assisted in times of disaster including such events as the sinking of the Titanic and the 1937 Ohio River flood, are also examined.

Amateur Radio Electronics V10 Home Study

Author: Clive W. Humphris
Publisher: Lulu Press, Inc
ISBN: 1291310029
Format: PDF, ePub
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Amateur Radio Electronics V10 Home Study is now published as a portable, learning, reference and revision guide. Radio enthusiasts, students, trainers and hobbyists can have their own low-cost portable version as an eBook, plus an interactive App for a tablet or smartphone, along with the existing hugely popular PC version software. The accompanying app and software brings all these images to life by allowing the reader to input their own values which then updates the graphics. Both can be downloaded at no extra charge thereby providing an additional portable or computer based interactive learning resource as an easy and enjoyable way to study. Unlock both the App and accompanying software with your eBook receipt. See Additional Notes at the back of the eBook for download details. All together a combined eBook, App and PC educational package at a tiny fraction of the previously published price.

The Hobbyist s Guide to the RTL SDR

Author: Carl Laufer
Publisher: Createspace Independent Publishing Platform
ISBN: 9781514716694
Format: PDF, Mobi
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A comprehensive guide to the RTL2832U RTL-SDR software defined radio by the authors of the RTL-SDR Blog. The RTL-SDR is a super cheap software defined radio based on DVB-T TV dongles that can be found for under $20. This book is about tips and tutorials that show you how to get the most out of your RTL-SDR dongle. Most projects described in this book are also compatible with other wideband SDRs such as the HackRF, Airspy and SDRPlay RSP. What's in the book? Learn how to set up your RTL-SDR with various free software defined radio programs such as SDR#, HDSDR, SDR-Radio and more. Learn all the little tricks and oddities that the dongle has. A whole chapter dedicated to improving the RTL-SDR's performance. Dozens of tutorials for fun RTL-SDR based projects such as ADS-B aircraft radar, AIS boat radar, ACARS decoding, receiving NOAA and Meteor-M2 weather satellite images, listening to and following trunked radios, decoding digital voice P25/DMR signals, decoding weather balloon telemetry, receiving DAB radio, analysing GSM and listening to TETRA signals, decoding pagers, receiving various HF signals such as ham radio modes, weatherfax and DRM radio, decoding digital D-STAR voice, an introduction to GNU Radio, decoding RDS, decoding APRS, measuring filters and SWR with low cost equipment, receiving Inmarsat, Outernet and Iridium L-Band satellite data, and many many more projects! Guide to antennas, cables and adapters. Third Edition Released 20 December 2016.

The Amateur Radio Dictionary

Author: Don Keith
Publisher: CreateSpace
ISBN: 9781514810040
Format: PDF
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1400 terms...1600 definitions...hundreds of web links so you can learn more! This is the most comprehensive Ham Radio glossary ever compiled. Any pursuit that mankind might adopt quickly develops its own language, its proprietary jargon, its own semi-secret dialect fully understood only by its most avid and serious practitioners. The hobby of Amateur Radio, now entering its second century--and as vibrant and exciting as ever--is a good example. But now, for the first time, a complete and easy-to-use dictionary is available, ready for quick reference. This book, compiled by best-selling author, award-winning broadcaster, and active Ham enthusiast Don Keith N4KC, is intended for use by newcomers or those just getting interested in Ham Radio. But it is also a valuable resource for old-timers, too. New words pop up all the time whether it is on the air, in periodicals, or in Ham Radio groups. Technology and on-air operating events continually introduce new words into the lexicon. Hams have such a wide variety of options they may pursue that even the most active operators often need to quickly look up a term. The maker movement and maker faire popularity are also attracting many newcomers to the hobby and this glossary is an invaluable asset to those as well. So here it is, THE Amateur Radio Dictionary, the most comprehensive glossary of Ham Radio terms ever compiled. Keep it near your operating position, use it when you encounter a term that is new to you. And get the most from this fascinating hobby!