1 edition of Widebanding techniques for VHF antennas - II found in the catalog.
Widebanding techniques for VHF antennas - II
Keem B. Thiem
by Naval Postgraduate School, Available from National Technical Information Service in Monterey, Calif, Springfield, Va
Written in English
For a variety of mechanical and electrical reasons, the U.S. Army prefers to use a wire antenna for its mobile applications in the HF and VHF bands. However, due to the rapid fluctuation of impedance with frequency, a simple wire antenna is not suitable. This research will look into the aspects of electronic switching of the antenna length and electronic switching of the accompanying tuning network for frequency hopping applications. Two separate schemes will be studied. The first one involves a chosen wire antenna loaded with PIN diodes. The diodes will be selectively switched ON or OFF at different frequencies to control the input impedance of the antenna. In the second scheme, a monopole antenna of fixed length will be considered and data on its input impedance over many sub-bands within 30 to 90 MHz will be generated. Tuning networks composed of resistors, inductors and capacitors will be designed over each sub-band. The various networks will then be connected via PIN diodes and selectively switched to provide matching over a much wider band
|Statement||by Keem B. Thiem, Ramakrishna Janaswamy|
|Contributions||Janaswamy, Ramakrishna, Naval Postgraduate School (U.S.). Dept. of Electrical and Computer Engineering|
|The Physical Object|
|Pagination||vi, 133 p. :|
|Number of Pages||133|
Featuring easily constructed antenna systems that offer adequate performance, this book offers practical ideas and projects to get you on the air from anywhere: HF Antennas Single and multiband designs for all bands from 80 through 10 meters. VHF/UHF Antennas Antennas for 6 meters, 2 meters and even 70 centimeters. Masts and Other Supports. Wire antennas can be made wideband if the antenna is loaded with passive elements and connected to a lossless matching network. However, realization of .
Cheap Yagi Antennas for VHF/UHF by Kent Britain, WA5VJB edited by John Maca, AB5SS [Editors notes: The antennas described in this article were built as the result of several discussions between Kent and a Cuban radio operator. While there are plenty of high performance antenna designs,File Size: KB. DX wideband antenna system The DX is a very small active receiving antenna with a frequency range covering 30 kHz to MHz. It is powered by either 12 Volt DC battery supply or () Volt ac mains supply. The DX antenna is very unobtrusive and can be mounted in nearly every situation thanks toFile Size: KB.
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Widebanding Techniques for VHF Antennas II [Keem B. Thiem] on *FREE* shipping on qualifying offers. Widebanding Techniques for VHF Antennas II. Full text of "Widebanding techniques for VHF antennas - II" See other formats S2' NPSEC NAVAL POSTGRADUATE SCHOOL Monterey, California Widebanding Techniques for VHF Antennas - II by Keem B.
Thiem Ramakrishna Janaswamy March FedDocs D /2 NPS-EC Approved for Public Release; Distributed Unlimited Prepared for: Naval.
THE (VHF) DIPOLE ANTENNA At VHF and UHF, most antenna systems are derived from the dipole or its complement, the slot antenna.
Many antennas are based on half-wave dipoles fabricated from wire or tubing. The feed point is usually placed at the centre of the dipole, for although this is not absolutely necessary, it can help prevent.
VHF/UHF Handbook Edited by: Andy Barter, G8ATD The VHF/UHF Handbook is THE guide to theory and practice in the VHF and UHF bands The VHF/UHF Handbook is packed with content from around the world.
This book provides the reader with a wide range of interesting operating modes and techniques alongside the VHF/UHF basics. Basic Antennas is a comprehensive introduction to antennas--basic concepts, practical designs, and details of easy-to-build antennas.
You ll learn how to make antennas that really work. This book will provide a foundation in antenna theory and design necessary for anyone undertaking more advanced topics such as those presented in The ARRL /5(44).
equipment installation like soldering VHF connectors to coaxial cables, making a pig tail, cutting aluminum tubes and using an SWR meter. Obviously a knowledge in operating a VHF transceiver is the most important.
Here is one rule of a thumb in installing VHF antennas: If you use an RG File Size: 2MB. VHF and UHF Antenna Systems cable TV operators as “end runs”—pieces at the end of a roll.
The most common CATV cable is 1/2-inch OD Ω Hardline. Matched-line loss for this cable is about dB/feet at MHz and dB/feet at MHz.
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It offers high performance at 1, watts with a six-decibel gain, and includes a foot coaxial cable. The Laird / Antenex BN is a 55 inch long, Chrome, base loaded mobile VHF whip antenna with NMO base.
This antenna does NOT require a metal ground plane. It is omnidirectional and offers 2 dBi gain and accepts up to watts max power and operates in Brand: Laird. Radials • The commercial broadcast standard for radials on an HF vertical is 1/4 wave wires “buried” two to three inches to achieve the best low angle performance.
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Basic Antennas is a comprehensive introduction to antennas--basic concepts, practical designs, and details of easy-to-build antennas. You’ll learn how to make antennas that really work.
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VHF ANTENNAS. For some years now I have been designing and building my own VHF/UHF/SHF antennas. Some have been pretty standard designs, modified to suit the materials available and my construction techniques.
Most of them were designed by "rule of thumb" using information from text books and a bit of educated guesswork. antennas for vhf and uhf radio bands category is a curation of web resources on, VHF-UHF Long Boom Very High Performance Antenna Designs, Shrunken Quad, UHF VHF Folded Dipole.
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So, let’s see what your starter antenna options are. And that means simple, economic, easy to deploy -or even make- radio antennas for the VHF and UHF bands. The Groundplane. It is the antenna that uses an artificial “ground” to work. In a base antenna the “ground” is the 3 or 4 radials that extend from its base.
In a mobile (car.the three most widely used VHF mo-bile antennas (1/4, 1/2 and 5/8-wave-length monopoles) each installed on four different vehicles (a full and a mid-sized passenger car, a small pickup truck and an SUV). The models themselves (Figure 1) are rather boxy reminiscent of the Volvos of years past and do not truly portray the droopy-snooted-high-backFile Size: KB.The Antenna Farm: Wide Band UHF Antennas - VHF & UHF Mobile Radios Radio Accessories VHF & UHF Hand Held Radios Antennas Mobile Antenna Mounts SWR/Power Meters Adapters Coaxial Cable Two Way Accessories Antenna Accessories DC Power Supplies Coax Cable Accessories Connectors Aviation Radios Repeater Systems Towers & Accessories Duplexers .