Photo 0-A shows a view of my late wife sitting under the beach umbrella resonant in the 40-meter amateur radio band. Umbrella antenna" to the radio hams on the 40-meter band. In shopping at a sports store, I saw the beach umbrella "antenna." It was a lot of fun describing my "beach
Understanding building and using baluns and ununs plus#
The author's XYL sitting under the W2FMI 40meter beach umbrella antenna.Īccurate transmission test sets having an error of only plus or minus 1 millidb! The ultimate results of my studies for a short vertical antenna in the 40-meter amateur radio band appear to be for a 6-foot-tall version with a large top hat.
The parameters and standing wave ratio as a function of frequen cy for the W2FMI 40-meter beach umbrella antenna. Furthermore, my new assignment, which included arranging exchange visits between our technical staff and the outside world, gave me the opportunity to have my transformers measured on extremelyġ♰ 7.210 7.220 7.230 7.240 7.250 7.260 7.270 7.280 7.290 Frequency (MHz)įigure 0-1. I found the TLT to be an ideal matching transformer for the low resonant-impedances encountered.
Since my hobby was amateur radio, I decided to look at short vertical antennas and short radial ground systems. This whole subject resulted from a work transfer back to our Bell Labs Headquarters in Murray Hill, New Jersey, from our Western Electric Branch lab at Allentown, Pennsylvania. It is obvious that many transformers have been constructed and measured. Have often been asked the reason for spending so much time and effort on the transmission line transformer (TLT). This book is dedicated to my late wife, Connie. Neither the author nor the publisher shall be liable to the purchaser or any other person or entity with respect to liability, loss, or damage caused or alleged to have been caused directly or indirectly by this book or the contents contained herein. However, no responsibility is assumed for inaccuracies. The information contained in this book has been checked and is believed to be entirely reliable. While every precaution has been taken in the preparation of this book, the author and publisher assume no responsibility for errors or omissions. Making copies of editorial or pictorial content in any manner except for an individual's own personal use is prohibited, and is in violation of United States copyright laws. No part of this book may be used or reproduced in any form, or stored in a database or retrieval system, without express written permission of the publisher except in the case of brief quotes included in articles by the author or in reviews of this book by others. Copyright© 2003 CQ Communications, Inc., Hicksville, New York All rights reserved. 25 Newbridge Road Hicksville, New York 11801 USA Printed in the United States of America. Library of Congress Control Number 2003103912 ISBN 0-943016-24-X Editor: Edith Lennon, N2ZRW Layout and Design: Elizabeth Ryan Illustrations: Hal Keith Published by CQ Communications, Inc. Understanding, Building, and Using Baluns and Ununs Theory and Practical Designs for the Experimenter
0 kommentar(er)
