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DX Engineering Baluns, Ununs and RF Chokes
DX Engineering Maxi-Core® 20 Baluns and Feedline Chokes
The present-day DX Engineering was launched in the year 2000. To celebrate our 20th Anniversary in the year 2020 we have developed a new line of Baluns and Feedline Chokes. Introducing DX Engineering "Maxi-Core® 20" Baluns and Feedline Chokes. They reduce or eliminate currents on the outside of your feedline allowing you to hear and to be heard much better. They keep more RFI/BCI out of your antenna and receiver and transfer more of your transmitted signal to the antenna for higher efficiency, the best antenna pattern and maximum performance. Signaling a new era of RF performance across the 1.8 to 54 MHz frequency range, DX Engineering Maxi-Core® 20 Baluns and Feedline Chokes handle full-legal-power-plus and provide higher common mode impedance (CMI) across a greater frequency range than competing models and even previous DX Engineering and Comtek models. Years of R&D coupled with major advancements in test equipment and techniques combined with custom ferrite materials have allowed our engineering team to design the DX Engineering Maxi-Core® 20 Baluns and Feedline Chokes. Maxi-Core® 20 Baluns and Chokes have high CMI across the AM Broadcast band and the HF/6M spectrum, which is essential to provide sufficient suppression of unwanted transmitted and received RFI/BCI current on the feedline shield exterior. Hear and be heard with DXE Maxi-Core® 20 Baluns and Feedline Chokes. Choose superior performance from these models: * DXE-MC20-1-1 Maxi-Core® 20 - 1:1 Current Choke Balun - For all HF-6m balanced antennas with a 50 ohm feedpoint, including resonant dipoles, loops, Yagis, beams, etc. * DXE-MC20-FC Maxi-Core® 20 - 1:1 Feedline Choke – This high CMI line isolator is perfect for use in line on 50 ohm coaxial feedlines, at the antenna, tower or shack end of the feedline. * DXE-MC20-1-1T Maxi-Core® 20 - 1:1 Current Choke Balun – This 1:1 "T" model is for force feeding antennas with a tuner. Use it at the end of ladder line of any impedance or mounted on a coax fed non-resonant antenna. This model tolerates operation at high SWR on non-resonant multi-band antennas. * DXE-MC20-C4-1 Maxi-Core® 20 - 4:1 Current Choke Balun is for use on antennas with a 200 ohm feedpoint and at the end of any impedance ladder line, especially on antenna systems with higher impedance. This model tolerates operation at high SWR on non-resonant multi-band antennas. * DXE-MC20-V4-1 Maxi-Core® 20 - 4:1 Voltage Balun is a 200 ohm to 50 ohm transformer for use on random long-wire and OCF antenna applications. This true voltage balun is intentionally designed with low CMI for antennas that need a transformer without RF choking for easier antenna tuner operation and it tolerates elevated SWR. Maxi-Core® 20 Baluns and Feedline Chokes are built into a convenient weather resistant NEMA enclosure that is mounted easily with optional brackets. They feature 1/4-20 stainless steel hardware and a high quality silver-plated PTFE dielectric SO-239 (UHF female) input connector. The SO-239 connector limits power handling to 5 kW at low SWR and reduced power at elevated SWR. These baluns and the feedline choke exhibit very low insertion loss and inherently low SWR. Optional mounting brackets are available for use on wire antennas or for verticals, Yagi and beam antennas. See the Suggested Parts tab after clicking "More Detail" on the model of interest. Combination packages that include balun or choke and mounting bracket are also available.
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$141.99
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$169.99
DX Engineering Maxi-Core® High-Power Multi-Band UNUNs
DX Engineering High-Power Multi-Band UNUNs with Maxi-Core® technology allow your antenna to perform to its fullest potential and reduce stress on your equipment. These specially tuned UNUNs, designed for non-resonant vertical antenna applications, operate more efficiently than similar competitive products. Lesser products may burn up easily on lower bands with QRO power levels. DX Engineering high-power UNUNs are specifically designed for applications with 43 ft. non-resonant, multi-band antennas, ensuring the best efficiency from your antenna and transmission line/tuner installation. The results are minimizing the additional transmission line losses caused by abnormally-high SWR. DX Engineering Maxi-Core® High-Power Multi-Band UNUNs can be added to any existing 43 ft. antenna installation or used to replace an older competitive UNUN for a performance increase. The UN-43-R includes mounting bracket and feed-point connections braids. Note: Whenever the DX Engineering "Documentation" tab is available, please look at the associated files for additional product information. All non-resonant vertical antennas present high SWR to their feed lines. Deal with it! Order DX Engineering High-Power Multi-Band UNUNs!
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$201.99
DX Engineering LPFC-BNC Low Power Feedline Chokes
DX Engineering LPFC-BNC Low Power Feedline Chokes are intended to be placed in line with coaxial cable fed antennas and equipment used for portable operations, including POTA and SOTA activations. The DXE-LPFC-BNC coax wound toroid achieves an amazing common mode impedance (CMI) curve, with an RF choking capability that far exceeds the CMI of 'a-few-beads-on-coax' product that is offered by other suppliers. Actually, these "Low Power" Feedline Chokes can be used in any station that runs less than 250 watts SSB, 100 watts CW or Digital. ________________________________________ DX Engineering Low Power Feedline Chokes features and benefits: - A unique, lightweight form, with clear heat shrink over the choke* - Light enough to hang inline at the feedpoint of any portable HF antenna. - BNC female connectors for easy connection to portable antennas and gear. - Much higher CMI that other portable, low power chokes, especially across the 40 through 6 meter bands. - Frequency range of 1.8 through 54MHz. - RF Power Handling up to 250 watts PEP SSB, 100 watts CW and Digital (at SWR <2:1). - Recommended for general use to isolate either end of a coaxial cable. * Not intended for permanent outdoor use unless mounted inside a weatherproof enclosure. ________________________________________ These chokes are ideal for use at any HF transceiver or receiver antenna connection, portable, mobile or base. In most cases, DXE-LPFC-BNC prevents RFI, stops stray RF and noise on the feedline from getting into the receiver that would cover up weak signals, and improves efficiency of the antenna system. For any station, including POTA and SOTA, mobile and base, DX Engineering Low Power Feedline Chokes keep the RF controlled.
Not Yet Reviewed
$59.99
DX Engineering Maxi-Core® 20 Feedline Choke and Mount Kits
DX Engineering Maxi-Core® 20 Feedline Choke and Mount Kits, DXE-MC20-FCM, provide current balance and feedline isolation on coaxial cables for all types of HF through 6 meter antennas including verticals, rotatable dipoles, directional beams and Yagi antennas. Intended for 50 ohm feedlines operated at low SWR, this combination of mounting plate bracket and effective 50 ohm RF choke handles full-legal-power-plus and provides higher common mode impedance (CMI) across a greater frequency range than competing feedline choke and line isolators and previous DX Engineering and Comtek models. High CMI across the AM Broadcast band and the HF/6M spectrum is essential to provide sufficient suppression of unwanted transmitted and received RFI/BCI current on the feedline shield exterior. With less noise and interference you will hear and be heard using a DX Engineering Maxi-Core® 20 Feedline Choke and Mount Kits. DX Engineering Maxi-Core® 20 Feedline Choke and Mount Kits bring new parts together to work on many types of antennas. They provide improved RF isolation and current balance at either end of the feedline and at the feedpoint of a vertical, a beam, rotatable dipole or other antenna feedline. This is a unique perpendicular choke mount that allows a beneficial separation between the ferrite of the choke and the antenna boom or mast, resulting in improved choking performance compared to a choke mounted on metal. The UV black high-strength polymer mounting plate provides additional isolation and holes for different mounting positions for the choke, horizontal or vertical. Stainless steel hardware is included to attach the plate to the stainless steel mounting bracket, which has laser cut holes for one of five optional DX Engineering Saddle Clamps to cover mast or boom sizes from 1 to 2 in. and 2.375 to 3 in. Click "More Detail" for additional information and click Suggested Parts for required optional items including one saddle clamp to fit your mast or boom and coaxial cable assemblies. Maxi-Core® 20 Feedline Chokes features high quality silver-plated PTFE dielectric SO-239 (UHF female) connectors. The SO-239 connector limits power handling to 5 kW or less at low SWR and reduced power at elevated SWR. These feedline chokes exhibit very low insertion loss and inherently low SWR. They are built into a convenient weather resistant NEMA enclosure with weep holes at all four corners of the "bottom" side of the enclosure, to vent properly when mounted vertically or horizontally for all types of antennas. Make your antenna play to its potential; reduce RFI and improve reception with DX Engineering Maxi-Core® 20 Feedline Choke and Mount Kits.
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$207.98
DX Engineering Balun or Choke Mounting Plate and Bracket Kits
DX Engineering Balun or Feedline Choke Mounting Plate and Bracket Kits provide a variety of mounting solutions for DX Engineering Maxi-Core® 20, Comtek and other brands that use 4 x 4 x 2 in. plastic NEMA boxes. This rugged polymer plastic plate and stainless steel bracket kit may be used at the base of any vertical, on the boom of a Yagi or beam antenna, or even on a mast or post. This unique perpendicular mount provides a beneficial separation between the ferrite of the balun or choke and the metal tubing of the antenna or mount, resulting in improved choking performance. This UV black high-strength polymer mounting plate provides additional isolation between the feedline and the antenna system for optimal performance and decoupling. The stainless steel mounting bracket has holes laser cut for any one of these optional heavy-duty DX Engineering V-Saddle Clamps. Choose based on the outside diameter (OD) of your antenna mounting pipe or boom tubing: -DXE-CAVS-11P for 1/2 to 1-3/4 in. aluminum tubing -DXE-CAVS-2P for 1 to 2 in. aluminum tubing -DXE-CAVS-3P for 2 to 3 in aluminum tubing -DXE-SSVC-2P for 1 to 2 in. for steel pipe -DXE-SSVC-3P for 2.375 to 3 in. steel pipe No optional clamps are necessary when attaching this Mounting Plate and Bracket Kit to a 4x4 or 6x6 wooden post for vertical. Use two suitable wood lag bolts or carriage bolts from a local hardware. DX Engineering Balun or Feedline Choke Mounting Plate and Bracket Kits are the right choice to mount a DX Engineering Maxi-Core® 20 Balun or Feedline Choke onto a vertical or beam antenna.
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$37.99
DX Engineering Wire Antenna Balun Mounting Brackets
DX Engineering Wire Antenna Balun Mounting Bracket Kits are custom designed specifically for mounting high-performance Maxi-Core® 20 Baluns or legacy Comtek baluns. These kits include the virtually unbreakable combination balun mounting frame and wire antenna center insulator bracket, two DX Engineering End Insulators plus all stainless steel hardware. This unique design provides minimum capacitive coupling between the antenna wire and the field surrounding the balun core. Wire Antenna Balun Mounting Bracket Kits are the ideal starting point for building a top-performing and long-lasting coaxial cable fed single-band or multi-band wire antennas. Use a DX Engineering Maxi-Core® 20 Balun or Comtek balun, or other manufacturer's similar NEMA box balun, for a resonant or off-center fed dipole, inverted-V or loop. Use the optional coaxial cable strain relief (DXE-CSR213-1 for RG-213 or RG-8U sized coax or the DXE-CSR8X-1 for RG-8X sized coax) with your optional dipole wire (DXE-ANTW Antenna Wire) and antenna rope, all from DX Engineering. These patented** balun wire antenna insulator brackets and end insulators are made from a super high-strength UV resistant black poly-resin compound. They provide an exclusive serpentine wire-weave grip for insulated antenna wire. This method of threading the wire provides a grip strong enough to permanently support the antenna wires without the need for soldered wrapped wire ends onto the antenna wires. This allows fast and easy field adjustments of antenna length for tuning without soldering. Get everything you need to build the best performing, longest lasting wire antenna possible, all from DX Engineering! DX Engineering Wire Antenna Balun Mounting Bracket Kits DXE-WA-BMB: 1 ea. Balun & Wire Antenna bracket High-strength UV black poly-resin (** US Patent # D744,459) 2 ea. DX Engineering End Insulators High-strength, UV poly-resin (**US Patent # D534,905) 4 ea. 6-32 x 3/4" long Stainless Steel Hex Head Bolts 8 ea. #6 Stainless Steel Flat Washers 4 ea. 6-32 Nyloc Hex Nuts Click "More Detail" to see the "Documentation" tab for additional product information and the "Suggested Parts" tab for the additional items (not supplied) for your resonant wire antenna project with the DX Engineering Wire Antenna Balun Mounting Bracket Kit.
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$29.99
DX Engineering Ferrite Bead Choke Kits
DX Engineering Ferrite Bead Choke Kits, DXE-FBC, provide the components for the simplest and most effective technique of creating RF isolation at an antenna feedpoint or feedline termination. Covering the frequency range 1.8 to 54 MHz, these 40 toroidal mix-31 solid ferrite beads, installed on a user supplied coaxial cable (prior to connector installation*), to build an RF choke with a very high Common Mode Impedance (CMI) over a very wide frequency range. This is the same choke that world-class contest and DX stations install. Given the simplicity and raw performance of this 40-bead choke, its comprehensive RF features and benefits should become familiar to every radio amateur and antenna experimenters. * Yes!, the superior overall performance of the DXE-FBC Ferrite Bead Choke completely offsets the trouble of cutting off a coaxial connector, installing the kit, and then installing a new connector. It really is that good!
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$152.99
DX Engineering Maxi-Core® 20 1:1 Balun and Mount Kits
DX Engineering Maxi-Core® 20 1:1 Balun and Mount Kits, DXE-MC20-1-1BM, provide current balance and feedline isolation for HF through 6 meter verticals, rotatable dipoles, directional beams and Yagi antennas. Intended for 50 ohm feedpoint antennas that offer low SWR, this combination of mounting plate bracket and effective 1:1 RF choke balun handles full-legal-power-plus and provides higher common mode impedance (CMI) across a greater frequency range than competing balun models and previous DX Engineering and Comtek models. Their high CMI across the AM Broadcast band and the HF/6M spectrum is essential to provide sufficient suppression of unwanted transmitted and received RFI/BCI current on the feedline shield exterior. With less noise and interference you will hear and be heard using a DX Engineering Maxi-Core® 20 1:1 Balun and Mount Kit. A similar kit was formerly known as the Vertical Feedline Current Choke. But, the Maxi-Core® 20 1:1 Balun and Mount Kit bring new parts together to work on many types of antennas. They provide improved RF isolation of the feedline and current balance at the feedpoint of a vertical, a beam or rotatable dipole. This is a unique perpendicular mount that allows a beneficial separation between the ferrite of the balun and the antenna boom or mast, resulting in improved choking performance compared to a balun mounted on metal. The UV black high-strength polymer mounting plate provides additional isolation and holes for different mounting positions for the balun, horizontal or vertical. Stainless steel hardware is included to attach the plate to the stainless steel mounting bracket, which has laser cut holes for one of five optional DX Engineering Saddle Clamps to cover mast or boom sizes from 1 to 2 in. and 2.375 to 3 in. Maxi-Core® 20 Baluns feature 1/4-20 stainless steel hardware and a high quality silver-plated PTFE dielectric SO-239 (UHF female) input connector. The SO-239 connector limits power handling to 5 kW or less at low SWR and reduced power at elevated SWR. These baluns exhibit very low insertion loss and inherently low SWR. Maxi-Core ® 20 Baluns are built into a convenient weather resistant NEMA enclosure with weep holes at all four corners of the "bottom" side of the enclosure, to vent properly when mounted vertically or horizontally for all types of antennas. Click "More Detail" for additional information and click Suggested Parts for optional items required, including one saddle clamp to fit your mast or boom, and a wiring kit or flexible copper strap to connect the balun to the antenna feedpoint terminals. Make your antenna play to its potential; reduce RFI and improve reception with DX Engineering Maxi-Core® 20 1:1 Balun and Mount Kits.
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$207.98
DX Engineering TWIG QRP 9:1 UNUNs
The DXE-TWIG-9-1 QRP UNUN (Unbalanced-to-Unbalanced transformer) matches a high-impedance, non-resonant end-fed/random wire antenna (33 to 84 feet long) to the 50-ohm unbalanced load required by amateur radio transceivers. The DXE TWIG-9-1 covers 1.8–30 MHz and is ideal for portable (QRP) or HOA-restricted antennas. The connector on the DXE-TWIG-9-1 is a BNC female to mate with the recommended 35 to 50 feet of coax cable, which is used as the counterpoise. In some cases, an external wide range tuner may be needed. This UNUN may not provide a perfect 1:1 SWR on all bands without an additional tuner and may experience heating at higher power due to impedance mismatches. Typically, 9:1 UNUNs are used for: • Random Wire Antenna: Long wires of specific non-resonant lengths (e.g., 29, 35.5, 41, or 71 feet) designed to avoid an electrical half-wave, or multiple of a half-wave, on any amateur band. • End-Fed Long Wire: General-purpose long wire used for wideband receiving or multiband transmitting where an antenna tuner is available. • Inverted "L" or Sloper Configuration: When these are fed as non-resonant wires rather than resonant half-wave radiators. Tips on How to Use the 9:1 QRP UNUN as a Random Wire Antenna 1. Select a "Random" Length: Do not use resonant half-wave lengths. Popular lengths that avoid resonance on amateur bands include e.g., 29, 35.5, 41, or 71 feet. 2. Connect the Antenna Wire: Attach your long wire to the element wire terminal of the UNUN. 3. Use an Antenna Tuner: Because a random wire is never perfectly resonant, you may have to use an internal or external antenna tuner to achieve a low SWR for your transceiver. 4. Placement: Mount the UNUN near the ground or on a short support and run the element wire as high and clear of obstacles as possible. The antenna shown in this manual was tested using the optional 24 or 26 AWG wire such as CEW-VIZ24-YEL100 stranded copper, PVC insulated, high visibility yellow antenna wire. The coax cable (with BNC connectors) is recommended to be 35 to 50 feet in length since the coaxial cable shield is used as the counterpoise. The antenna can be installed in different configurations. Wire lengths will vary depending on the installation and antenna design chosen. This is a low power (QRP) antenna system impedance matching UNUN which handles 25 Watts on SSB, 10 Watts on CW and 5 Watts on digital mode when the antenna SWR is less than 2:1 without the use of an antenna tuner.
Not Yet Reviewed
$49.99
DX Engineering Balun Upgrade Kits
DX Engineering Balun Upgrade Kits provide the superior performance of a 1:1 DX Engineering Maxi-Core® 20 Balun, mounting bracket, hardware and clamps for your antenna update. Maxi-Core® 20 Baluns keep more RFI/BCI out of your antenna and receiver and transfer more of your transmitted signal to the antenna for higher efficiency, the best antenna pattern and maximum performance. They handle full-legal-power-plus and provide higher common mode impedance (CMI) across a greater frequency range than competing models and previous DX Engineering and Comtek balun models. DX Engineering Balun Upgrade Kits include: - DXE-MC20-1-1 Maxi-Core® 20 - 1:1 Current Choke Balun - For all HF-6m balanced antennas with a 50 ohm feedpoint, including resonant dipoles, loops, Yagis and beams. - DXE-BMB-4P Balun Mounting Bracket, For Maxi-Core® 20, with Poly-Resin Plate and Stainless Steel Hardware - DXE-BALUN-WK DX Engineering Balun Wiring Kits - Wire, Terminal and Hardware for antenna connection - DXE-ECLS-150 or DXE-ECLS-200 Stainless Mounting Clamps with Studs – One pair of studded band clamps with Stainless Steel Hardware, for antennas with 1.50 in. boom or mast or up to a 2.00 in. boom or mast. Maxi-Core® 20 Baluns and Feedline Chokes are built into a convenient weather resistant NEMA enclosure that is mounted easily with optional brackets. They feature 1/4-20 stainless steel hardware and a high quality silver-plated PTFE dielectric SO-239 (UHF female) input connector. They have weep holes at all four corners of the "bottom" side of the enclosure, so they work properly for vertical or horizontal mounting for all types of antennas. The SO-239 connector limits power handling to 5 kW at low SWR and reduced power at elevated SWR. These baluns exhibit very low insertion loss and inherently low SWR. When it is time to refurbish your Yagi, beam or rotatable dipole, purchase DX Engineering Balun Upgrade Kits to use the best 1:1 baluns for your antennas.
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$226.96
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$227.96
DX Engineering Low Power Balun Center Insulators
DX Engineering LPB-B Low Power Balun Center Insulators feature an amazing Hi-CMI 50-ohm 1:1 Balun built onto a Center Insulator board, and a BNC female right-angle connector pre-installed. Designed for portable operations on HF bands, these baluns let you join the fun of making a high-performance Single Band or Multi-Band Linked Dipole! This coax wound toroid achieves an amazing common mode impedance (CMI) curve, with an RF choking capability that far exceeds 'a-few-beads-on-coax' products that are offered by other suppliers, and they can handle up to 250 watts on SSB voice, or 100 watts or less on CW or Digital modes on frequencies below a 2:1 SWR. They are designed for building a center supported Inverted Vee Dipole (not end supported) and are great for use with DX Engineering Nomad Portable Telescopic Masts (sold separately). Great for POTA, SOTA and JOTA, low-cost DIY Low Power Balun Center Insulators are ready for use on a monoband resonant or link-clip multi-band resonant wire antenna for portable or long-term temporary operations. These Low Power Balun Center Insulators are the heart of the DX Engineering Low Power Portable Dipole and Winder Kits.
Not Yet Reviewed
$49.99
DX Engineering TWIG QRP 1:1 Choke Baluns
DX Engineering TWIG QRP 1:1 Choke Baluns were engineered as the key component for building a low power (QRP) dipole antenna. Ideal for use during outdoor adventures such as POTA® or SOTA, or any portable operation. The TWIG incorporates a 1:1 transformer to keep the feedline impedance of the half-wave element wire down to 50-ohms. The connector is a BNC female and matches up with the recommended coax and most low power (QRP) transceivers. When properly installed and the element wire is accurately tuned, the system can achieve an SWR below 2:1 without the need for an external antenna tuner, reducing the amount of extra equipment required. The TWIG 1:1 is rated for 25W SSB, 10W CW, and 5W digital.
Not Yet Reviewed
$49.99
DX Engineering Mounting Brackets for Baluns
DX Engineering Mounting Brackets for Baluns are custom-made, patented* adapter plates. They accommodate your DX Engineering Maxi-Core® 20 Baluns and Chokes, for mounting on a boom or mast of an antenna. These UV resistant poly-resin balun mounting brackets also fit legacy Comtek Baluns and other manufacturers' similarly packaged, NEMA box baluns. These kits include stainless steel mounting hardware for only the balun. Choose a pair of specific optional ECLS series band clamps with studs, sold in pairs, required to mount these Mounting Brackets onto a boom, a mast or pipe, in sizes ranging from 1/2 in. through 3-1/4 in. Note: Whenever the DX Engineering "Documentation" tab is available, please look at the associated files for additional product information. *U.S. Patent Number D597086
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$20.99
DX Engineering Mounting Brackets for COMTEK Baluns and DX Engineering UNUNs
DX Engineering Mounting Brackets for COMTEK Baluns and DX Engineering UNUNs are custom-made adapter plates that accommodate your balun or UNUN when used with MBVE-5 Series antennas. These brackets are supplied with a specific ECLS Series band clamp with studs, to mount these brackets onto MBVE-5A Series antenna bases. Their unique design provides minimum capacitive coupling to the balun wiring and the field surrounding the balun core. These UV-resistant, poly-resin balun mounting brackets will fit other manufacturers' similarly packaged, NEMA box baluns. These kits include the plate, a pair of studded band clamps and stainless steel balun/UNUN mounting hardware. Note: Whenever the DX Engineering "Documentation" tab is available, please look at the associated files for additional product information.
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$18.99
DX Engineering TWIG QRP 4:1 Current Baluns
The DXE-TWIG-4-1C QRP Current Balun is designed to be used as the feedpoint of a very low power (QRP) Off Center Fed dipole (OCF) antenna. Ideal for use during outdoor adventures such as POTA® or SOTATM, or any portable operation. The TWIG-4-1C incorporates a 4:1 transformer to convert the OCF antenna impedance of 200-ohms to the desired 50-ohms to match the coaxial cable feedline. It also has a 1:1 feedline choke, to prevent current imbalance, detuning, and to help prevent the addition of unwanted noise. The connector is a BNC female and mates with the recommended coax and most low power (QRP) transceivers. When properly installed and the element wire is properly tuned, you should not need an external tuner. This reduces the need to bring more equipment than is necessary or a portable operation and provides higher efficiency of your output signal and instant band changes. The antenna shown in this manual was designed and tested using the optional 24 AWG wire such as CEW-VIZ24-YEL100 stranded copper, PVC insulated, high visibility yellow antenna wire. The BNC connectors coax cable is recommended to be at least 25 to 35 feet in length. The antenna can be installed in different configurations of wire lengths for various band selections. For example, a very common TWIG QRP OCF for 40, 20, 15 and 10 meters has one 57 ft. dipole wire and the other wire is 12 ft. See the chart in the Instruction Manual linked below for details. This is a low power (QRP) antenna system balun which handles only 25 Watts on SSB, 10 Watts on CW and 5 Watts on digital mode when antenna SWR less than 2:1, without the use of an antenna tuner.
Not Yet Reviewed
$69.99
DX Engineering Balun Wiring Kits
DX Engineering Balun Wiring Kits are just the right parts for permanently connecting a DX Engineering Maxi-Core® 20 Balun or a legacy Comtek balun to practically any beam, Yagi, Log Periodic or rotatable dipole with stud terminals on its driven element. This wiring kit is not a bracket. This is 8 AWG tinned solid copper wire, 2 ft., and an assortment of tinned solder ring terminals to electrically connect a #10 or 1/4 inch terminal stud balun to either size two stud balanced feedpoint on antennas of several types. Wire a balun to an antenna feedpoint with the DX Engineering Balun Wiring Kits. DX Engineering Balun Wiring Kits include: - Two feet, 8-Gauge Tinned Solid-Copper Bus Wire - Four each, Ring terminal, solder, for #10 stud - Four each, Ring terminal, solder, for 1/4 in. stud - Two each, Star washers, 1/4 in. - Two each, Nyloc hex nuts. 1/4 in. for 1/4-20 balun studs Instructions for installation: 1. Determine the separated routing of the minimal wire length needed for each balun terminal to antenna terminal connection with drip loops (see 2.), no greater than 12 inches each, from the securely mounted balun to antenna feedpoint. Wires must be separated by 1/2 to 1 inch from antenna metal parts and each other. 2. Include enough wire length for a small drip loop, a downward "U" shape in the wire, to prevent rain water from running straight down into either connection. This drip loop also provides wire strain and vibration relief. 3. Cut the tinned copper wire in half and trim excess to make the two wire lengths, preferably identical. 4. Select the terminals that match the balun and the antenna feedpoint. 5. Solder the tinned ring terminals onto the tinned wire. 6. Install each completed wire assembly with the appropriate size Nyloc nut and star washer along with the hardware supplied with the balun. Attach the other end with hardware supplied with the antenna Use an open end wrench on the balun stud mount nut when tightening Nyloc nuts, and then the wing nuts, to prevent stud rotation and possible internal damage to the balun. NOTE: This 8 AWG tinned copper wire fits into the supplied ring terminals even though both the #10 and the 1/4 in. ring terminal terminals are marked 12-10 (AWG). Soldering these ring terminals onto this wire is required for a permanent connection. Only crimping will produce an insufficient connection. These balun wiring kits may be used on many manufacturers' stud terminal baluns.
Not Yet Reviewed
$12.99
DX Engineering Bead Choke Standoff Kits
DX Engineering Bead Choke Standoff Kits bring a practical solution to a serious problem when ferrite chokes are placed directly onto the metal boom at the feedpoint of beam antennas. A number of Amateur Radio operators and antenna engineers have known for years about the superior choking function of many ferrite toroids beads placed directly on the coaxial cable, as compared to standard feedpoint baluns. A more recent revelation is that the proximity of ferrite beads on coax taped to the aluminum boom of the antenna drastically reduces their effectiveness. DX Engineering Bead Choke Standoff Kits are mounting systems, made of fiberglass or acetyl standoff rods (color varies), PVC carriers and stainless steel hardware, available in four versions. Two sizes of PVC cradle tubes handle two different types of RF bead chokes; 3/4 inch outside diameter (OD) ferrite beads on RG-400 size cable, and 1 inch OD ferrite beads on RG-213 size 0.405 in. coax cable. Each are offered with two different boom size clamps, 2 inch OD and 3 inch OD. Bead Choke Standoff Kits simply hold an RF bead choke and feedline 4 inches away from the metal beam antenna boom (or 4 inches away from the metal mast for a dipole). They maintain the optimal choking performance of ferrite beads on coax. Using DX Engineering Bead Choke Standoff Kits, ferrite bead chokes function at peak performance for these key results: • Prevent feedline radiation of RF • Preserve current balance for proper beam antenna pattern • Prevent feedline shield exterior collected noise and signals from entering the antenna and interior of the feedline, resulting in lower noise floor and enhanced reception The absolute superiority of RF chokes made of many beads on the feedline, over the traditional enclosure balun, is becoming better understood in Amateur Radio. They achieve the best possible RF isolation of the feedline from the antenna and provide completely balanced currents at the feedpoint. Plus, they provide quieter reception with reduction of common-mode noise. Keeping Bead RF Chokes away from metal preserves the optimal function of this method of antenna feedpoint current balance and isolation. This mechanical requirement is simple and practical with DX Engineering Bead Choke Standoff Kits.
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$52.79
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$65.99
DX Engineering Dual Impedance Antenna Transformers
DX Engineering Dual Impedance Antenna Transformers are dual ratio UNUN (unbalanced to unbalanced line) transformers. They're great for coupling your 50 ohm coax to an antenna with a feed point impedance of either 25 or 12.5 ohms, typically found at HF mobile antennas. DX Engineering Dual Impedance Antenna Transformers are ideal for antennas that have been enhanced with a Hot Rodz capacity hat. These transformers are housed in an aluminum enclosure and use silver plated PTFE SO-239 connectors. Many mobile HF antennas are naturally between 10 ohms and 36 ohms at resonance. With 10 ohms at a 50 ohm feed point the resulting SWR is 5:1! Likewise, 36 ohms yields a 1.4:1 SWR. Matching at 1.4:1 isn't too bad, but 5:1 is definitely an issue. DX Engineering MM-1 Dual Impedance Antenna Transformers are ideal for adjusting the impedance mismatch in your HF mobile! When the natural resonant impedance of the antenna is at 30 ohms or below, the MM-1 mobile unun can provide the needed match. With a 50 ohm input, it provides a 25 ohm port and a 12.5 ohm port to facilitate mobile HF matching. Let's say that your antenna analyzer indicates a resonant antenna impedance of 22 ohms. Your SWR without an MM-1 would be 50/22 or 2.27:1. That's enough to cause considerable power rollback in most modern HF rigs. Using the MM-1 25 ohm port, your SWR would be 25/22, or 1.14:1. That's a very significant improvement! Many hams are using antenna analyzers to adjust mobile HF antennas. When a mismatch is indicated at resonance, a DX Engineering MM-1 Unun can solve the problem! Power handling capability depends on the match: * Using the 25 ohm to 50 ohm port, with SWR below 2:1 on the 50 ohm side, -- 750 watts PEP * Using the 12.5 ohm to 50 ohm port, with SWR below 2:1 on the 50 ohm side, -- 500 watts PEP Note: Whenever the DX Engineering "Documentation" tab is available, please look at the associated files for additional product information. Antenna analyzers are becoming more common. Buy or borrow one to check the impedance of your mobile antennas. Then get DX Engineering Dual Impedance Antenna Transformers to get the best match and highest efficiency you can!
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$184.99
DX Engineering Balun and Feedline Current Choke Mounting Kits
DX Engineering Balun and Feedline Current Choke Mounting Kits allow you to mount a legacy "metal case" DX Engineering balun or feedline current choke at the base of any vertical antenna. This original mounting plate is not drilled for the Maxi-Core 20 Baluns and Feedline Chokes released in February 2020. Please see DXE-MC20K-BRKT to mount the plastic NEMA box models. For the older metal case models, this polymer mounting plate is isolated from the rest of the vertical ground system for best performance and decoupling. The mounting brackets were designed to utilize DX Engineering's V-bolt DXE-CAVS-1P saddle clamps, to mount the bracket onto a 1/2 to 1-3/4 in. ground pipe which mounts the balun or choke horizontally. Also available are the heavy duty DXE-CAVS-11P for 1/2 to 1-3/4 in. aluminum pipe and DXE-SSVC-2P for 1 to 2 in. steel pipe. V-bolt saddle clamps are not included and will need to be purchased separately if you choose to mount your bracket to a ground pipe. If you are mounting to a 4x4 or 6x6 wooden post, then no clamps are necessary--simply use 2 suitable wood screws. These kits work with any DX Engineering balun or choke with a formed-aluminum enclosure. Each kit includes a polymer mounting plate, aluminum adapter brackets, and stainless steel mounting hardware. Mounting clamps are sold separately. Note: Whenever the DX Engineering "Documentation" tab is available, please look at the associated files for additional product information. This is the legacy DX Engineering Balun and Feedline Current Choke Mounting Kits for the metal case baluns and feedline current chokes.
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$28.99
DX Engineering Replacement Ceramic Insulators
DX Engineering replacement ceramic insulators are designed for use with DX Engineering baluns. They are manufactured from quality materials and include one gasket for installation. These through-panel ceramic replacement insulators have a diameter of 1.250 in. and are 0.813 in. tall without the metal hardware (not included). They are also very suitable for homebrew projects and as replacements in special applications such as vintage transmitters or trans-matches. For the best in porcelain insulators, DX Engineering Replacement Ceramic Insulators are the ones to use!
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$23.99