Availability
COMTEK Antennas
COMTEK CFC-50X Common Mode Feedline Chokes
COMTEK CFC-50X Common Mode Feedline Chokes are designed to suppress unwanted RF currents on the outside of the shield on coaxial feedlines. These 1:1 inline coaxial feedline chokes are built with fifteen Mix-31 ferrite beads on premium DX Engineering RG-8X coaxial cable, offering improved performance for a wide variety of antenna systems. COM-CFC-50X Key Benefits: • Provides Effective Shield RF Current Suppression from 1.8 to 54 MHz, helping eliminate common mode currents that cause RF feedback and noise inside the feedline. • Consistent and balanced pattern across frequency range: Excellent RF choking isolating the feedpoint prevents current imbalance, which preserves radiation pattern and antenna performance.
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$59.99
COMTEK Current Feedline Chokes
The updated COMTEK CFC-50A 50 ohm Feedline Chokes consist of 75 heavy-duty mix-31 RF choke beads on a length of RG400 PTFE coax terminated at both ends with silver-plated PTFE PL-259/UHF male connectors and the correct length of heat-shrink tubing. COMTEK Current Feedline Chokes ensure that stray RF does not flow on the outside shield of your feedlines. They are typically installed at the antenna feedpoint connection. They may also be used where a long run of feedline leaves a remote antenna switch or a tower. They are also very effective at the shack end of a long run of on-the-ground or above-ground coaxial feedline, to block unwanted RF signals and noise picked up on the shield. These chokes provide excellent common mode impedance and handle up to 5 kW from 1.8 to 54 MHz. These chokes are assembled except for the tubing needs to be installed and heat-shrinked after the choke is positioned as it will be installed.
( 14 )
$131.49
COMTEK 20VA 20-10 Meter Vertical Antennas
COMTEK 20VA Vertical Antennas are rugged, yet economical quarter wave antennas designed primarily to be used in sets with phased vertical array systems. They are well suited for Four Square arrays from COMTEK and DX Engineering or any other four-square array systems. These monoband 20VA antennas may be used on any single band from 20 meters through 17, 15, 12, 11 or 10 meters by adjusting the length accordingly. Designed by the people who know all about phasing, these antennas provide precise control of all parameters. These verticals are constructed from 6063-T832 (drawn, not extruded) aircraft-specification aluminum tubing. COMTEK 20VA antennas taper from a large 1.0-in. OD base section to a 3/4-in. OD top section. While they're built to withstand the most rugged environmental conditions, light guying is always recommended for phased systems to keep the spacing precise and minimize swaying. High-strength, UV-resistant EXTREN insulators that won't crack, peel, splinter, or fail will ensure you of years of long-lasting, reliable performance under adverse conditions. Mounting brackets are laser-cut by the latest state-of-the-art manufacturing equipment. Stainless steel hardware is used throughout and the antennas come complete with V-saddle clamps for installation to your ground mounted pipe. Pipe of 2.0-in. OD is recommended but the clamps will accept any OD from 1 in. to 2 in. Plumbing galvanized water pipe called 1-1/2 in. size is actually 1.9 in. OD and works well. For a single 20 meter vertical or a set of elements for a phased array, consider COMTEK 20VA Vertical Antennas from DX Engineering!
( 10 )
$189.99
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$759.96
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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$399.99
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$539.99
COMTEK 40VA 40 Meter Vertical Antennas
COMTEK 40VA Vertical Antennas are rugged, yet economical quarter wave antennas designed primarily to be used in sets with phased vertical array systems. For instance, DX Engineering DVA Dual Vertical Array systems and four square arrays from COMTEK and DX Engineering or any other four-square array controllers. Designed by the people who know all about phasing, these antennas provide precise control of all parameters. Constructed from 6063-T832 (drawn, not extruded) aircraft-spec aluminum tubing, COMTEK 40VA antennas taper from a huge 2 in. O.D. base section to 1-3/8 in. O.D. at the top. While they're built to withstand the most rugged environmental conditions, light guying is always recommended for phased systems to keep the spacing precise and minimize swaying. Hardware used is of the highest quality. High-strength, UV-resistant EXTREN insulators that won't crack, peel, splinter, or fail will ensure you of years of long-lasting, reliable performance under adverse conditions. Mounting brackets are laser-cut by the latest state-of-the-art manufacturing equipment. Stainless steel hardware is used throughout and the antennas come complete with V-saddle clamps for installation to your ground-mounted pipe. A 2 in. O.D. is recommended but the clamps will accept any O.D. from 1 in. to 2 in. Whether you want a quality ground mounted 40 meter vertical as a TX antenna, or are building your dream phased array, These COMTEK 40VA Vertical Antennas from DX Engineering are a great solution!
( 4 )
$325.99
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$1,303.96
COMTEK Truck Bed Mobile Antenna Mounting Plates
COMTEK Truck Bed Mobile Antenna Mounting Plates are designed to fit securely in the corner of your truck bed, offering a stable and reliable platform for mobile antenna installations. Crafted from premium, high-quality aluminum, these plates feature pre-drilled holes to accommodate NMO, UHF, and 3/8 in. stud mounts—giving you the flexibility to use a wide range of antenna mount styles. Note: Antenna mounts are not included.
Not Yet Reviewed
$29.95
COMTEK ACB-4A Series Four-Square Control Consoles
COMTEK ACB-4A Series Four-Square Control Consoles are specially designed replacements for the COMTEK ACB Series Hybrid four-square antenna systems. Now featuring a 12V DC input, they are easily integrated into all stations, including those that can be run on 12V DC emergency power. They have four scratch pads that you may label and associated LEDs to indicate the array's directional positions. COMTEK ACB-4A Series Four-Square Control Consoles from DX Engineering are ready to control your COMTEK Hybrid Array.
( 3 )
$169.99
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!
( 2 )
$569.98
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$709.98
COMTEK Vertical Feedpoint Connection Kits
If you are planning to build your own aluminum vertical four-square or 2-element phased arrays, COMTEK Vertical Feedpoint Connection Kits are what you have been looking for. These feedpoint assemblies ease the task of attaching a coaxial cable to your aluminum tubing. Silver SO-239s and stainless steel hardware ensure long life and reliability. Available individually or as a set of four, COMTEK Vertical Feedpoint Connection Kits from DX Engineering give you a great start to your project.
( 1 )
$19.99
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$79.96
COMTEK Phased Vertical System Replacement Relays
COMTEK Phased Vertical System Replacement Relays are offered for repairing COMTEK PVS-2 switch relay units as well as COM-STACK-2 relay units. These RF-capable, DPDT panel mount relays have contacts rated to 2 kW RF at low SWR. They are designed to be operated at 12 Vdc, with a minimum of just under 10 Vdc required for pull-in, and they have a coil resistance of 85 ohms. Since they are chassis or panel mount relays, they are especially well suited for a wide range of your homebrew projects.
( 1 )
$31.99
COMTEK Stack 2 Yagi Switch Control Consoles
COMTEK Stack 2 Yagi Switch Control Consoles are designed for use with newer or older COMTEK Stack 2 systems. These are the control consoles, only. They include a 2.1mm power cord and operate on 12V DC. Station power, if used, must be 12V DC at 1A minimum (fused). A 3-conductor control line between the control console and relay unit is required. Whether you are replacing a damaged console or building a new system from parts, these COMTEK Stack 2 Yagi Switch Control Consoles from DX Engineering are what your stacking system needs!
Not Yet Reviewed
$62.50
Clearance
COMTEK Stack 3 Yagi Switch Control Consoles
COMTEK Stack 3 Yagi Switch Control Consoles are available as replacements for Stack 3 Yagi Systems. When connected to the Stack 3 Switch Relay Unit, these control consoles allow you to select one antenna, all antennas, or any combination of two antennas. Indicator lights for each antenna tell you at a quick glance which antennas are selected. Choose either 115 V AC or 12 V DC control console operation. Keep using your Yagis together! Order COMTEK Stack 3 Yagi Switch Control Consoles from DX Engineering!
Not Yet Reviewed
$124.99
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$125.99
$68.74
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$75.59
COMTEK 30VA 30 Meter Vertical Antennas
COMTEK 30VA Vertical Antennas are rugged, yet economical quarter wave antennas designed primarily to be used in sets with phased vertical array systems. For instance, four square arrays from COMTEK and DX Engineering or any other four-square array controllers. Designed by the people who know all about phasing, these antennas provide precise control of all parameters. Constructed from 6063-T832 (drawn, not extruded) aircraft-spec aluminum tubing, COMTEK 30VA antennas taper from a huge 2 in. O.D. base section to 1 1/2 in. OD. at the top. While they're built to withstand the most rugged environmental conditions, light guying is always recommended for phased systems to keep the spacing precise and minimize swaying. High-strength, UV-resistant EXTREN insulators that won't crack, peel, splinter, or fail ensure you of years of long-lasting, reliable performance under adverse conditions. Mounting brackets are laser-cut by the latest state-of-the-art manufacturing equipment. Stainless steel hardware is used throughout and the antennas come complete with V-saddle clamps for installation to your ground-mounted pipe. A 2 in. O.D. is recommended but the clamps will accept any O.D. from 1 in. to 2 in. For 30 meter performance you can count on, order COMTEK 30VA Vertical Antennas from DX Engineering!
( 4 )
$299.99
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$1,199.96
COMTEK Control Console Replacement Parts
COMTEK Control Console Replacement Parts are available to repair your COMTEK switch control console.
Not Yet Reviewed
$21.99