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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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$125.99
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Diex Antennas Two-Band Trap Shortened Rigid Rotatable Dipoles
Diex Antennas Two-Band Trap Shortened Rigid Rotatable Dipoles offer high performance multi-band HF operations, and they are an excellent choice where there's not enough space for a full-size dipole or Yagi. Crafted with precision in Brazil using quality materials, these aluminum tubing antennas are designed to withstand tough environments assuring long-lasting, exceptional performance. They are packed partially assembled, saving valuable time and effort. Typically mounted on a rotating mast, these unique multi-band HF antennas provide high-band directionality depending upon installed height above ground. Given the nature of shortened low-band antennas with limited SWR bandwidth, these antennas feature the flexibility of physical adjustment to set the lowest SWR to a specific frequency. DIEX Antennas Two-Band Trap Shortened Rigid Rotatable Dipoles power handling is 1500W PEP SSB, which is further limited if using an antenna tuner. NOTE: Diex Antennas recommends that a directional HF antenna should be mounted on a tower at a minimum height of 33 to 50 ft. (10 - 15 meters) above ground level and must be installed in the clear, away from power lines, trees, buildings or other towers and antennas.
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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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Hi-Z® Antennas Array Phase Combiner Units
Hi-Z® Antennas Array Phase Combiners are the relay unit at the center of a Hi-Z array, also known as a "phase controller." The sophisticated RF phasing and switching electronic devices have connections for the receive short element active vertical feedlines, delay lines, and the main feedline that goes to the station. Control cable connections to the phase combiner powers the array and steers the array pattern, and the station end connects to the directional control console.
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$325.00
$227.50
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4O3A A50 Antenna/Load Switches
4O3A A50 Antenna/Load Switches serve as 50-ohm loads for open ports on the HFC4500 combiner or other multiplexer, preventing tuning degradation. Applying 12V power connects the input to the combiner's output, linking it to the corresponding combiner or filter. A typical setup switches a filter or a combiner to a monoband antenna. When the A50 is not powered, the switch defaults to a 50-ohm termination for the input and the antenna output is open. NOTE: The A50 is NOT an A/B switch. The manufacturer's label of "A/B Switch" is a product grouping, NOT an indication of the function of this product. The LOAD resistor is internal, so one of three connectors is unnecessary, which leaves an open hole in the chassis, a "normal feature" of the A50.
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$181.99
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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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DX Engineering Boom Element Plates
DX Engineering Boom Element Plates are used to build long-boom monoband directional antennas for the standard bands, 20 through 6 meters. They are made from a very strong 3/8 in. thick insulating material, each predrilled for specific DX Engineering saddle clamps and sized dependent upon band and element type, driven or parasitic. They accommodate the mounting of aluminum antenna elements to a 3-inch boom for special beam antenna kits. This series of insulated plates have no hardware; they are component parts used in the DXE-EBB Element to Boom Bracket Kits which include one plate and the appropriate sizes and number of saddle clamps, depending upon band and element type. DX Engineering Antenna Element Tubing Kits, Element to Boom Bracket Kits, and Antenna Boom Tubing Kits are each sold separately.
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Larsen Mobile Antenna Mounts
Larsen Mobile Antenna Mounts are premium-quality antenna mounts. Larsen also has high performance trunk lip mounts. These mounts are a better solution than drilling holes in your car, especially when your car is leased! Manufactured of quality materials, their trunk lip mounts will last car after car. To assemble your own mount, Larsen offers their TMB Series mounting brackets. These are stainless steel brackets without cable or antenna base. They are perfect for assembling a custom installation. When you need a great antenna mount, trust Larsen Mobile Antenna Mounts from DX Engineering!
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Moonraker Whizz Loops
Moonraker Whizz Loops are compact QRP portable loops that are perfect for attaching directly to your ft-817 or other QRP transceiver. These nifty, small magnetic loops were designed to be an easy-to-use, instant portable HF antenna solution for stations not exceeding 10 watts in any mode. They attach to a SO-239 and become part of your transceiver. Loop tuning is easily achieved with their built-in tuning circuit. Available in three versions; order our part number MKR-13-427 to cover 20-6 meters, MKR-13-428 to cover 40 through 10 meters, or the MKR-13-429 to cover 40 through 6 meters. These loops are only 40cm in diameter; that's about 15.75 in. across! If you are seeking the tiniest and lightest QRP magnetic loops available, then take a look at one of these Moonraker Ltd Whizz Loops!
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Low Band Systems HF Transmit Band Pass Filters
NOTICE: Due to materials supply and logistical issues, resupply of Low Band Systems products will be delayed for an indefinite period. Low Band Systems HF Transmit Band Pass Filters are very high quality multi-stage devices designed to specifically limit the RF band pass to a single Amateur band. They eliminate image and harmonic RF interference issues for dedicated mono-band operations in multi-radio contesting environments. Required for use with transmit multiplexers, these passive filters provide the additional isolation needed to allow multiple transceivers to be operated on different bands simultaneously on the same antenna. Used individually on mono-band radio and antenna combinations, these filters provide the isolation required in multi-radio contest stations. Low Band Systems band pass filters are available for each of the ten HF Amateur Bands in 200, 500 and 1,500 watt models, and 2,000 watt models for the main contesting bands of 160, 80, 40, 20 ,15 and 10 meters. Their unique aluminum enclosures, some with fans, are laser cut with "Perfo-Box" on the side and their power handling and band of operation are stenciled chassis cutouts in European nomenclature, such as "3,5 MHz" for the 80 meter filter, for example. Their permanent demarcation allows immediate identification, preventing any future trouble with faded or missing printed labels. Supplied only with standard UHF Female/SO-239 connectors, these HF Transmit Band Pass Filters achieve over 60 dB of out-of-band suppression that virtually eliminates out of band noise and interfering signals. They are designed to provide a sharp roll off just outside each Amateur band; just below 3.5 MHz and just above 4.0 MHz for the 80 meter filter for example. Low Band Systems filters are the first choice of major multi-multi contest stations around the world! They provide the clear benefit of a dramatically lower noise floor for enhanced single-band weak signal reception desired for elite contest and Field Day operations. Low Band Systems Band Pass Filters are used in conjunction with their multiplexers, also known as multi-band transmit combiners. Low Band Systems Diplexers, Triplexers, Quadplexers and Pentaplexers, also available from DX Engineering, provide good levels of isolation between band ports, but band pass filters are also needed for multi- transmitter operation. This is because the multiplexer's main purpose is to balance the impedances for the multiple-transceiver/single multi-band antenna stations. They provide UHF Female/SO-239 connections for multiple 50-ohm transceivers to be connected to a single 50-ohm feedline. So, band pass filters are REQUIRED for each multiplexer band input to provide the additional isolation required to allow multiple transceiver setups to work. The transceivers for each band are connected to their associated band pass filter, and then to the multiplex device such as a triplexer, which is connected to a tri-band beam, for example. All transceivers can operate simultaneously with up to 80 dB of isolation, unhindered by the signals from the other connected radios operating on the other bands on the same antenna! Achieve the advanced operational advantages that these exceptional filters and multiplexers provide. Order Low Band Systems HF Transmit Band Pass Filters from DX Engineering! NOTE: Filters made for 160 meters are 2.0 MHz low pass models to prevent harmonics on higher bands. They do not reject frequencies below 1.8 MHz. If AM broadcast interference is a problem, an additional BCI filter should be used. After better antennas, these filters are suggested as the most important multi-radio station upgrade by top contest station builders and operators. Low Band Systems HF Transmit Band Pass Filters simply allow more contacts to be made with worldwide DX stations and DXpeditions.
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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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