Search results

Article descrive the different types including coax and open-wire feeder and waveguide.

The Classic Numbers for All Types of Wire Antennas at HF. Wire antennas need to be made a bit long and cut to resonance. They are affected by height above the ground and surrounding objects. In order to get an idea of the right place to start, certain formulas are generally accepted.

A page with an embedded video about a two elements yagi antenna for 28 MHz based on the original antenna design by VE7CA

Delta Electronics, Inc. NY USA, family owned and operated selling all varieties of consumer electronics including 10 meter amateur radios, antennas, accessories, microphones, cw transmitters, coax cables and more

WT4Y Amateur Radio, stealth antennas, computerized logs, QSL card images

Online shop for amateur radio antenna parts, accessories, holders, clips and insulators for home made antennas. Antena Kit delivers also ham radio transceiver mounts, cables, antenna rotors and other accessories. Based in Brazil

Welcome to our line of Low Frequency, Natural Radio Research, Broadcast, Marine and Shortwave products. Our evolving product line is the result of our dedicated research efforts primarily in the areas of LF, VLF, MF, and HF.

Australian antenna manufacturer, Mobile 1 CB Radio Antennas, Mobile Phone Antennas 3G, NextG, EDGE Digital Radio & TV Antennas Broadcast Band Antennas Airband Antennas Amateur Band Antennas Scanner Antennas Commercial Antennas

The page provides information on a simple 50MHz J-Pole Antenna project based on the DK7ZB design. It explains the principle of the Wireman-J-Pole, the feeding process, practical mounting, and simulation results using MMANA GAL. The content aims to guide amateur radio operators in building their own J-Pole antennas for the 6-meter band.

NJ2X is a licensed amateur radio operator (FCC Amateur Extra) who enjoys casting electromagnetic waves into the ether. NJ2X pursues many aspects of the hobby including chasing DX, participating in mini-DX expeditions, building equipment and antennas, and papering his shack walls with ARRL awards. NJ2X dedicates this amateur radio oriented site to helping others who also enjoy the greatest of scientific hobbies. The site is suitable for all readers - families, the young, and the young at heart.

An interesting article on end fed half-wave wire antennas with a couple of original experiments. Author illustrate the role of the QRP matchbox, and a 40/20 meter antenna with a center stub making it a large bandwidth antenna for 40 and 20. Includes also an 80/40 end fed with the typical coil to make it available on 80 merts band.

Scan Antenna supply precision antennas to some of the world’s most advanced, market leading companies. Their antennas fit in satellite voice/data, mobile/wireless GSM, GPS, marine/land based radio and other specialty systems.

Sommer Antennas has been a manufacturer and producer of quality amateur radio antennas and antennas for professional use for more than 20 years.Developed by DJ2UT in Germany, our beams were first introduced to the U.S. market at the 1984 Dayton Hamvention

New generation Hex Beam Antennas. VHQ HEX Products, located in Peterborough, NH, is owned and operated by David M. Lavoie. Our products are designed to solve issues encountered in Ham radio applications and move with todays configurations in an ever changing climate

M0AUW's Amateur Radio blog specialising in Cobweb and Moxon antennas

Dipole antennas are some of the simplest antennas to build in addition to being very efficient and solid performers. I wanted to make a simple dipole antenna for QRP portable operation that could be used on multiple bands.

This project details the construction and testing of a M0PLK Delta Loop antenna for the 20-10m ham radio bands. Inspired by positive reviews highlighting its reduced local QRM compared to Cobweb antennas, the author built the antenna using aluminum tubes, DX-Wire FS2 wire, and a 1:4 balun. A mix of custom 3D-printed parts and careful assembly ensured stability and performance. Initial VSWR measurements met expectations, and test QSOs demonstrated success across multiple bands. Future enhancements include adding a lightweight, remote-controlled rotator for directional capabilities.

Loading is a way to lower the resonant frequency of an antenna radiator. This technique is typically used in antennas that have radiating elements that are too short for the desired resonance frequency. In this excellent article the author experiment loaded vertical dipoles for 20 meters band

Ultimax antennas manufacturer of amateur radio End-Fed and bazooka antennas made in USA

Antennas for Amateur Radio and short wave listening

Amateur Radio Amateur Radio Manuals & Books Computer Books & Programs Computer Hardware Rare & Hard to Find Books amateur radio,electronics ,electronis parts,tubes, amplifiers,towners, beam antennas and more

The KGD antenna is an option for those with space restrictions. The idea behing this project is to provide a short dipole antenna for HF Bands and to allow operations on HF bands when its not possible to setup large antennas, using these short base loaded dipoles.

The club was founded in 1987 when a group of ham operators hauled radio gear, antennas, and a generator to the island by boat to operate portable during ARRL Field Day

Italian manufacturer and dealer of mobile cb radio antennas

Construction tips of a basic wire antenna, the half wave dipole. Inverted V dipoles and effects of inverted v on radiation pattern.

Midway Electronics supplies the area with electronic components, wire, cables, amateur radio transceivers, QRP kits, CB transceivers, GMRS radios, Shortwave radios, power supplies, antennas, coax, connector and ham radio accessories

The Terminated End Fed Vee Antenna (TEFV) is a travelling wave antenna with constant current distribution. Unlike traditional resonant antennas, TEFV operates without standing waves, using a terminating resistor for broadband efficiency. With a combination of vertical and horizontal polarization, it offers wide bandwidth from 1.8 MHz to 30 MHz, eliminating the need for a tuner. Key components include a 9:1 unun transformer and a 500-ohm terminating resistor. Grounding and counterpoise enhance performance, and it can handle power losses of up to 30%. TEFV provides an effective, versatile antenna solution for amateur radio and broadcast applications.

Italian amateur radio station. Projects, programs, antennas for radio amateurs.

Design and manufacture antennas for mobile devices, wireless data including WiMAX, WiFi, and WISP (Wireless Internet), two-way radio and RFID (Radio Frequency Identification).

Antenna insulators manufacturer, CQ Antennas provides great quality amateur radio gear to amateur radio operators and trusted emergency preparedness pros at a great price

Experimenting with capacitive antennas for 40 and 80 meters band. A very space-saving antenna with good receivings caracteristics

The collinear J-Pole, often known as the Super-J, does improve the behavior over a regular J-Pole. there is an advantage when vertically combining 1/2 radiating sections to have a bit of separation between the half-wave end points. Get 0.8 dB more gain out of the trusty Super-J by replacing the traditional phasing stub with a long coil.

Coax Velocity Factor in Baluns, Does it Matter? Test results show coaxial cable velocity factor does not always enter into stub length calculations especially in the world of Baluns

Ham radio activity and homebrew from Italy with some interesting article on QRSS, decoding interfaces, APRS and antennas

Amateur radio antennas manufacturer based in Italy. Produces HF end-fed, dipoles, and other wire antenna types, mono band and multi band antennas.

Discover the key facts about what radio propagation is, the different types available and how they affect different frequencies.

HyEnd is a dutch amateur radio antenna manufacturer. Makers of the popular HyEndFeed Antennas, produce Baluns, bandpass filters and selle Line isolators, coax cables and connectors.

TelTad is a Polish amateur radio dealer with an online shop. Products offered includes all major ham radio brands, Yaesu Icom Kenwood, Alpin, OM Power, VPA systems Antennas

Experiences with software defined radios SDR and active antennas using the RTL SDR dongle and Spyverter HF up-converter

The risks for exposure to significant levels of RF radiation is high for tower climebers, the RF field levels near FM radio and television antennas are extremely high.

Wuxi Venus Information Technology is an amateur radio devices dealer in China, source for high end, high performance RF products,Control products,APRS products and Commercial products. It provides a variety of solutions to the antennas systems, APRS,electronics kits and electronics components

LB3HC's hightech blog - Amateur radio, RF design, electronics, uC, software, Arduino, AVR, Antennas

Web site dedicated to articles relating to Ham and CB Radios and antennas, reviews and classifieds.

A comparison among a traditional J-Pole Antenna and 2BCX Slim Jim Antenna

Ham Radio Dealer based in Holland dealers of most relevant ham radio brands. Transceivers, antennas and accessories for amateur radio and marine radio markets.

The "DIY Telescopic-V Antenna £35" project showcases the creation of a budget-friendly, portable telescopic V-shaped antenna inspired by commercial designs. Using eBay-sourced telescopic whips and custom mounting solutions, the author documents their process, testing, and adaptations. Despite challenges like weather and missing tools, the antenna performed well across multiple bands, enabling successful QSOs. Future improvements include exploring loading coils and testing in better locations. The compact design offers versatility for amateur radio enthusiasts seeking an affordable and practical solution.

Transformers can be used as part of a hybrid combiner or as phase inverters for an RX antenna array.

This is a remote antenna switch I use in my attic to connect transceivers in the basement to multiple antennas in the attic. The goal of this project is to be able to remotely connect one of the antennas in the attic to the only antenna cable available.

This page presents an online calculator tool for determining the dimensions of various HF wire antennas operating between 1.8-30 MHz. Users input their desired resonant frequency to obtain precise measurements for four popular antenna types: standard flat-top dipole, inverted Vee, quad loop, and equilateral delta loop. The calculator provides comprehensive measurements including leg lengths, minimum heights, horizontal spreads, and feedpoint distances. Accompanying the calculator are detailed technical explanations, construction notes, and installation guidelines for each antenna type, making it a practical resource for amateur radio operators building their own antennas.

Online coloured Azimuthal Map Generator. By default, this map shows the current gray line. The parts of the Earth that are currently in the sun (i.e., daytime) appear brighter, and the parts of the Earth that are experiencing night appear darker