Availability
HF Vertical Phased Arrays
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 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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$685.98
COMTEK ACB-4 Series Four-Square Switch Relay Units
COMTEK ACB-4 Series Four-Square Switch Relay Units use a well-established design and proven technology to offer any ham an advanced antenna system with s possible. Our phased array systems are affordable, simple to install, and easy to use. 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 30 meters; 60 meter array units are available by special order. Four-Square arrays are single band specific, due to antenna spacing and phasing feedline lengths, and for proper phasing and patterns. For manual operation, these relay units require the COMTEK ACB-4A Four-Square Control Console. It is now made to run on 12 to 14 Vdc, allowing easy operation of the four square array with battery emergency or International power sources. A DX Engineering factory-tuned cable feed system for the vertical array (available for your center frequency and sold separately) will provide the best performance. The ACB Series Hybrid Switch Relay Units also require a good 50 ohm, non-inductive dummy load. Contact DX Engineering for more information on Four Square Array components.
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$539.99
DX Engineering DVA Phasing Relay Units
DX Engineering DVA Phasing Relay Units are the band specific parts of the Dual Vertical Array Systems. These are larger, new Phasing Relay Units for any HF band, 160 through 10 meters. New heavy-duty components handle 2 kW continuous RF power for array performance at low SWR over a wide bandwidth. These mono-band weatherproof DVA Phasing Relay Units include a clamp for mounting directly between two ground-mounted, full-size, quarter-wave resonant verticals. Their companion DXE-EC-DVA Directional Control Console is a 3-direction array pattern selector that operates on 13.8 Vdc and features a 3-position rotary switch, directional LED indicators and scratch pads.. 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. Specifications for the DX Engineering Dual Vertical Array: * Forward Gain (approx., compared to single vertical): 3 dB End-Fire; 1 dB Broadside-Omni * Front-to-back: Over 20 dB nominal, end-fire patterns * Power Handling: 2 kW continuous * RF Connectors: Three SO-239 (UHF female); Transmitter, Antenna 1, Antenna 2 * Control Cable: 3 conductors, min. 20 AWG * Control Cable Set-Screw Connectors: Relay Unit--external; Control Console--internal DX Engineering Dual Vertical Array mono-band phasing systems are available for each HF band, with 160, 80 and 40 meters in stock, and 60 30, 20, 17, 15, 12 and 10 meter systems available by special order. Your phased array pattern results may vary, due to band conditions, the surroundings at antenna and the radial system installation. Additional information is in the Dual Vertical Array instruction manuals, linked at each system description web page.
Not Yet Reviewed
$509.99
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$609.99