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COMTEK ACB-4 Hybrid Four-Square Systems
COMTEK ACB-4 Hybrid Four-Square Systems are phased array Relay Units and Control Consoles that are affordable, simple to install, and easy to use. A four-square phased array consists of four mono-band resonant elements fed in phase relationships and power ratios that produce a directional cardioid pattern. Four-square arrays offer up to 5 dB of forward gain and fantastic front-to-back rejection over 25 dB! COMTEK ACB-4 Hybrid Four-Square Systems are designed for use with four quarter-wave ground mounted verticals, spaced one-quarter free space wavelength on the side of the square, with complete ground radial systems. Properly installed with quarter-wave 75-ohm phasing feedlines, the Four Square provides an excellent cardioid pattern that is steerable to the four directions of the corners of the four square array. Ground-mounted vertical arrays are easier to build and less costly to maintain than towers and beam antennas. Four-Square arrays are a practical solution for building a high performance directional HF antenna system, especially for Low Band DXing and contesting. Click the "More Details" link for more information on COMTEK ACB-4 Hybrid Four-Square Systems. COMTEK ACB-4 Hybrid Four-Square Relay Units are single-band phasing and relay devices. They are typically in stock for every major HF contesting Amateur band, and for 30 meters. The 60 meter band is available by special order. Four-Square arrays are single band specific, due to antenna spacing and phasing feedline lengths, for proper phasing and patterns. DX Engineering offers a full line of 75 ohm Phasing and 50 ohm feedline coaxial cables, control cables, antennas and accessories for your phased-array installation. The COMTEK ACB Series Hybrid Units also require a good 50 ohm, non-inductive dummy load. The electronically and mechanically improved COMTEK ACB-4 Hybrid Four-Square Systems now include the new COMTEK ACB-4A Four-Square Control Console. Specially designed to be useful as replacements for existing COMTEK ACB Hybrid four-square antenna systems, ACB-4A control consoles now feature a 13.8 VDC input to be easily integrated into all stations, including those that can be run on 12V DC emergency power. Their front panels have four-position rotary switches and four label pads and LEDs to indicate the array directional positions. The COMTEK ACB-4A Four-Square Control Console is ready to control your COMTEK Hybrid Array with low-cost three conductor control cable. COMTEK ACB-4 Hybrid Four-Square Systems include the Hybrid Relay Units with these features: * 2 kW rating for Amateur SSB and CW * 15 amp gold plated contact relays with dust covers * PTFE silver stranded wire over fiberglass tape-wound toroids * Balanced temperature, frequency, and voltage stable capacitors * Double-sided printed circuit board * MOVs for lightning surge protection with RF bypass caps * Brushed aluminum Z-chassis and cover with riveted seams * Mounting clamp included Regardless of the band you choose, COMTEK ACB-4 Hybrid Four-Square Systems from DX Engineering will help you rack up the contacts!
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$569.98
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$709.98
DX Engineering TFS4 Series B Transmit Four Square Systems
DX Engineering TFS4 Series B Transmit Four-Square Systems bring together the highest level of engineering excellence with the practical realities of operator convenience and ease of installation. These four-square hybrid systems are available in versions for the 160, 80, and 40 meter bands. They can be easily dropped into your quarter-wave spaced vertical 4-antenna array to provide optimum directional control. They allow the operator to receive or transmit with 5.5 dB gain in any one of four directions with a 20+ dB front-to-back ratio for interference reduction from unwanted directions. You can also switch to a single Omni-directional pattern with a push of a single button. This combination permits you to listen "all-around," unhindered by pattern nulls, and then select the best direction for signal reception and noise rejection. TFS4 Series B Transmit Four Square Systems are designed for use with four monoband vertical antennas placed at the corners of a square that is one-quarter wavelength on a side. The vertical element must be ungrounded and resonant in the desired band, and should be directly base-fed by the coaxial cable phasing lines from the centrally located controller (shunt-fed towers or radiating elements cannot be used). DX Engineering has several vertical antennas that are well suited for this application. Above all, a properly designed and installed radial system is necessary for top antenna performance, whether it's a single vertical or a full array. DX Engineering strongly recommends our optional Q75- series quarter wavelength cables constructed from our own high quality DXE-11U coax. It features a waterproof PE jacket, foam dielectric and has a velocity factor of 82 percent. These cables are electronically pruned to a precise electrical length derived from your choice of center operating frequency, terminated with hand-soldered silver-PTFE PL-259 connectors and weather-sealed with shrinkable tubing. Finally, each cable is tested for high voltage breakdown for maximum reliability and power handling. Since the transmit power is divided by the controller, the coaxial cable can handle QRO power with ease. If you already have a four-square array with a hybrid controller and would like to upgrade to improved performance and the Omni feature, the DX Engineering TFS4 Series B Transmit Four Square Systems are a direct transplant. BCD logic switching allows for the use of a 4-wire control cable to perform the necessary switching functions when powered by the included control console. Features: * Classic hybrid design is easy to install * Four directions plus Omni for versatile operation * 5 kW CW power rating for high reliability * Hot switching lock-out to disable amplifier while switching * Drop-in replacement for COMTEK systems * Proven DX Engineering RF relays for high performance * RF Shielded, high impact thermoplastic cover offers unique protection * Relays cycle during Power-On to ensure clean contacts Note: Whenever the DX Engineering "Documentation" tab is available, please look at the associated files for additional product information. Four-square systems work great! DX Engineering TFS4 Series B Transmit Four-Square Systems provide the heart of a modern phased array.
Not Yet Reviewed
$807.98
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$831.98
DX Engineering DVA Dual Vertical Array Systems
DX Engineering DVA Dual Vertical Array Systems are advanced phasing systems that have set a new standard for array performance with two ground-mounted verticals. Dual Vertical Array Systems include a compact DVA Phasing Relay Unit made specifically for an individual HF band and an EC-DVA Directional Control Console. DX Engineering Dual Vertical Arrays produce two opposite enhanced End-Fire Cardioid patterns and one Broadside-Omni pattern. Heavy-duty components handle over 2 kW continuous RF power for enhanced performance at low SWR over a wide bandwidth. The Dual Vertical Array end-fire directional patterns achieve a real front-to-back over 20 dB with typical array forward gain up to 3 dB over a single vertical. The greatest advantage of a Dual Vertical Array is that a tower and rotator are not required, as with a Yagi antenna. Especially for 160, 80, and 40, and even on the other HF bands, a Dual Vertical Array is mechanically simpler and safer. Here is a financially practical directional antenna that is much easier to install! These are great directional antenna systems for temporary and Field Day operation, as well as for permanent builds, because they ARE so much easier to install than a beam! If you are dissatisfied with your present system, are ready for an upgrade, or just need to get out of the tower game, the DX Engineering DVA is your answer! Refurbish an existing antenna system, equip your temporary array, or build a new phased array with a DVA. It's all on the ground, safe and simple: DX Engineering Dual Vertical Arrays offer a better way to enjoy a high-performance mono-band directional antenna. Note: Whenever the DX Engineering "Documentation" tab is available, please look at the associated files for additional product information.
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$575.98
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$775.98