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DX Engineering Multi-Band Dipole Antennas
DX Engineering Multi-Band Dipole Antennas are designs that are rugged, yet lightweight. Using a tuner, they are usable to 30 MHz and come complete with the wire elements, ladder feedline, center T support, and end mount brackets. These antennas are built using the highest quality components. They use 14 AWG stranded-copper, PVC jacketed elements for flexibility and strength and 100 ft. of 18 AWG 300-ohm 0.88 Velocity Factor ladder lines that are UV-resistant. Stainless steel hardware is included. Often, a 4:1 balun is suggested for multi-band dipoles; however, the best balun to use for this application is a 1:1 ratio. The 1:1 baluns provide better balance, have lower loss, and are more tolerant to load impedance and balance variations than other baluns. A tuner balun is not included in the dipole antenna kits and is available separately. The dipole center T support has pre-drilled holes for the attachment of the wire elements, feedline, and support or messenger lines. The center support top hole is used for the attachment of a "messenger line" that can be strung above the antenna wire and is used to provide support for the antenna wire and feedline. The use of the messenger line, which is strongly recommended but not included, will reduce the stress on the element wires and keep the antenna from stretching over time, which will change its resonant frequency. This line can be thin Synthetic Textile rope available from DX Engineering, which has a high breaking strength. Ideally, it should attach to the same structure used for the dipole, only above it, forming at least a 30 degree angle between the dipole and the messenger line. For further information and to decide the amount of rope you will need, please read the included instructions and check your wire antenna area of construction. Note: Whenever the DX Engineering "Documentation" tab is available, please look at the associated files for additional product information. When you lack the room for more than one antenna or need a multiband antenna for band agility, consider one of these DX Engineering Multi-Band Dipole Antennas as an elegant and economical solution!
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DX Engineering Rope Hardware Kits
DX Engineering Rope Hardware Kits are exactly what you need for all kinds of antenna projects that use support rope. Designed especially for use in conjunction with Mastrant Antenna Support Rope, these rope hardware kits provide just the right size pulleys, shackles, rope clips, duplex clips, carabiners, thimbles and quick links to facilitate fast and easy rigging, raising and lowering of wire antennas and guying of vertical antennas and antenna supports. They're great for experimenters, SWLs and Radio Amateurs who need to frequently adjust or "tinker" with their antennas. When used with new wire antenna installations, these products and Mastrant Antenna Support Rope allow for easy trimming or retuning of mono and multiband dipoles, end-feds, slopers and all types of wire antennas. Just lower, trim, and raise your antenna again until it's just right. For vertical antennas and support masts, use these kits for an installation that can be adjusted and disconnected easily, without having to constantly re-tie knots and deal with tangled excess rope. These kits feature stainless steel and metal-alloy parts for excellent durability and weather resistance. They will last a very long time. Are you raising a wire or vertical antenna or mast, or are using support rope on another project where strength and convenience are equally important? Consider using Rope Hardware Kits from DX Engineering for a professional looking project that really is stronger and is SO much easier to work on!
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Mastrant Antenna Support and Guy Line Ropes
Mastrant Antenna Support and Guy Line Ropes are available in several sizes and strength ratings, perfect for support of wire antennas, vertical antennas and antenna masts, as well as support of Yagi booms and elements. Mastrant ropes are of the highest quality for strength and are UV-protected for extended longevity. MASTRANT-O is a highly reflective rope (bright orange plus braided reflective tape) based on long-term proven Polyester (Dacron) product line. It is designed for maximum visibility in public places such as Field Day and POTA activities. Like all Mastrant ropes, it is UV stable and resistant to all weather conditions. It has low weight, great abrasion resistance, great durability and is nonconductive (no effect whatsoever on your antenna). Moreover, in contrast to ropes made from aramid fibers (Kevlar, Vectran, Technora, Twaron), it has knot strength about 60 %. Mastrant-P and Mastrant-R Ropes are stronger than other synthetic ropes of the same size, made from proven modern polyester. Mastrant-Q is a new rope made from a blend of polyester and polypropylene, designed specifically for guying applications. It offers an excellent performance-to-price ratio and has a knot strength of approximately 60%. It replaces Mastrant-P in diameters of 6 mm (1/4 in.) and larger. Mastrant-S is a similar polyester/polypropylene rope, distinguished by its highly reflective strands for increased visibility. Mastrant-M is their highest strength rope with the Dyneema® DM20 core, a superior synthetic rope offering high performance at an affordable price. Very high strength, negligible elongation, very low weight, and great abrasion resistance are all attributes that make Mastrant-M the best rope for guying. Larger, stronger sizes of Mastrant-M are used in Europe and other parts of the world for tower guying. Durability and safety are of prime concern to ensure that an antenna installation remains fully operational for a long time. Antennas and guy lines are exposed to changing weather conditions, mechanical strain, UV radiation, humidity, and more. These non-conductive synthetic fibers have all the necessary qualities: high strength, negligible stretch but good flexibility, long life, low moisture collection, fast drying, a minimum bending radius adding the ability to tie knots, good UV radiation resistance, weather durability and resistance to acids and alkali. Conversely, steel guying wires are heavy, difficult to work with, and their strength deteriorates with time due to corrosion and general aging. Electrical conductivity of steel guys is an undesirable feature, as they interact with the antennas and adversely modify radiation patterns. Thanks to recent developments in synthetic materials, both amateur and professional users are changing over to non-conductive guys and ropes. Mastrant offers these products for a variety of applications, from thin support lines used for wire antennas and beams, to rope guys for supporting small and portable masts and vertical antennas. When you need quality rope to install, replace, or modify your antenna systems, consider Mastrant Antenna Support and Guy Line Ropes, now available from DX Engineering.
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EAntenna Single Band Dipole
The EAntenna EA60JR Dipole is designed as a mono-band antenna for 60 meter, which also functions on the 15 meter band. It has an overall length of 16 meters (52.5 ft.) when installed as an Inverted-V; and a bandwidth over 100 kHz of 60 meters and over 500 KHz on 15 meters with a minimum SWR of 1.1:1 at 5330 kHz when installed at 10 meters (33 ft.) above ground. Maximum power is 1.5 kW continuous. Adjust the EAntenna EA60JR Dipole antenna resonance by 50 kHz with a 5 cm (2 in.) cut on each end of the dipole. All our antennas are computer designed and optimized, based on NEC2 and NEC4 engine. Each model is tested for reliability before it is marketed, to ensure optimum antenna performance for each customer installation. Antennas are measured to the millimeter with precision equipment. Baluns are manufactured in aeronautical-grade 6082 T5 aluminum. The Amphenol SO-239 UHF female connector is manufactured with the best materials, including ceramic dielectric for high power handling. The dipole antennas feature the best HF wire available, Flex Weave, 2mm 2 (AWG 14), terminated to a polyamide insulator capable of use within the extreme temperature range (-90 degrees to +70 ° degrees C). EAntenna are hand-made by qualified personnel for a final product of extreme quality. The advantages of EAntenna dipoles are: * Broad bandwidth compared to other brands * Very flexible wire, excellent for permanent and portable operation without deterioration * Non-directional (like an inverted V) * Great for DX! All this makes the installed EAntenna, your final antenna. A description of assembly is available inside the package, and answers to questions are available before the purchase directly from the manufacturer by email (ea7jx@eantenna.es). Excellent after-sales service and timely assistance are offered by email, as well.
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Kelemen Trap Dipole Antennas
Kelemen Trap Dipole Antennas are high-quality, heavy-duty pre-assembled wire antennas intended for permanent installations. They feature special traps made with of PTFE (Teflon®) insulated coax for high Q and low losses, offer high performance multi-band operations—and are excellent shortened antennas where there's not enough space for a full-size dipole. Kelemen Trap Dipole Antennas include a series of monoband models, as well as a series of multi-band models that cover an extensive combination of HF bands from 160m through 10 meters. Specific models handle either 400 watts, 1,000 watts or 2,000 watts PEP SSB and CW at resonance. Kelemen Antennas are fully temperature-resistant and weather-proof, and are manufactured from high-quality materials. Balun cases are constructed of transparent, weather-proof polycarbonate with a bottom-mounted SO-239 (UHF female) connector. Hardware and clamps are all stainless steel. Each antenna is completely assembled with the balun, clear PVC-insulated stranded copper wire, stainless wire clamps and egg insulators, ready for operation. Just add rope and coax to complete your Kelemen wire antenna installation. Kelemen Trap Dipole Antennas may be mounted horizontally or in an Inverted-Vee configuration with a central support required. Many Kelemen Antennas are perfect for portable operations because of their low weight. Their coaxial traps are much lighter than conventional traps, making it easier to keep the antenna at an effective height. In many cases they can be easily supported by a single fiberglass pole. For base operations, these antennas should be placed high, in an unobstructed location well away from buildings to limit shifting of resonant frequencies. Kelemen Antennas are often the best possible antenna choice for full-time base operations, offering the advantages of specialized multi-band coverage that perfectly complements the other antennas of the station. Order Kelemen Antennas in North America exclusively from DX Engineering.
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Par EndFedz® Antennas
Par EndFedz® Antennas are End Fed Half Wave (EFHW) antennas with the match box coax connection at the end of the wire, for convenient and quick stealth portable operations. These single-band and multi-band antennas can be mounted horizontally, vertically, or as a sloper. No ground plane or counterpoise is needed so portable operation could not be easier. Simply hang the far end from a tree limb or send the wire out a hotel room window or balcony. You can use a telescoping fiberglass mast to get the antenna really high in the air and the supplied end insulators the installation easy. Stealth operation in CC&R and HOA antenna restricted locations is simplified. Their all-black construction makes them difficult to see. Each Par EndFedz® features a UV-resistant black ABS plastic housing with a support rope attachment hole that encloses a matching network to allow the antenna to be fed with standard 50 ohm coaxial cable with a PL-259 (UHF male). All hardware is stainless steel and the SO-239 (UHF female) connector is silver plated and has a PTFE dielectric. The antenna wires are either 18 or 26 AWG stranded Copperweld® with 200 pound breaking strength and a tough, 100% UV stable black polyethylene jacket. One end of the antenna wire has a #10 solder lug making attachment to the matching network feedpoint simple and easily replaceable, if necessary. Standard single and multi-band versions handle 100 or 200 watts and higher power versions handle 300 watts. Lightweight QRP PolyStealth models handle 25 watts and are ideal for portable operation because they are lightweight; the MKII model weighs only 8 ounces and the Trail Friendly model weighs only 3.5 oz. Par EndFedz® Antennas require no counterpoise or extra conductors. The EF-ALLBAND-KW model, about 133 ft. in length, covers eight bands, 80 through 10 meters. The ALLBANDKWJR is 74 ft. in length and operates on five bands, 80-10 meters. The 64 ft. EF-40-10-KW operates on four bands. All three models handle up to 1000 watts SSB/CW and 250 watts AM/Digital Modes. The need for an external tuner may vary based on the antenna model selected and the desired operating band. The manufacturer refers to these antennas as "End-Fed Dipoles" based upon the assertion that a "half-wave radiator is a dipole." This is a variant of the classic definition of a dipole which is a center-fed antenna with two radiating legs running in opposite directions from the feed point. Additional claims about the EFHW state that end feeding a half-wave "can energize the radiator 'nearly' as well as a center-fed." Recent anecdotal measurements indicate that the EFHW radiates about 70% as well as a traditional center-fed dipole. More information is available at each Par EndFedz® model listed below. Order yours from DX Engineering.
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