Availability
19 Results Found For "noise"
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.
( 3 )
$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
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
InnovAntennas Ferrite Bead Baluns
InnovAntennas Ferrite Bead Baluns are fully assembled and ready to install, to achieve the absolute best performance from an InnovAntennas Yagi or other balanced terminal antennas. In contrast to wound baluns, ferrite bead choke baluns have the advantage of covering a wide frequency range for multiple bands. As required for most Yagi antennas from InnovAntennas with 50 ohm direct feed, ring terminals are installed on one end for the studded feedpoint connection. The other end is terminated in either Type-N or SO-239/UHF Female for the appropriate band coverage and impedance. Heat shrink filled with a UV-resistant adhesive provides a waterproof cover over the ferrite beads on the cable and the connector. Why do I need a Balun on my Yagi? Ferrite Bead Baluns offered by InnovAntennas provide very important functions of a balun, which is not well understood. For proper antenna performance, a ferrite bead balun inhibits common-mode current two important ways; A) it prevents RF flow on the outside the coax shield cable when transmitting, and B) it prevents stray RF noise picked up by the coax cable shield from entering the antenna system and affecting the receiver. What happens on the antenna without a RF choke balun? Several problems can occur. When an unbalanced feedline is connected directly to a balanced antenna with no BALUN in place, common-mode currents will run on the outside of the coaxial cable shield. The Yagi feedpoint is forced out of balance causing a skew and diminished beam antenna pattern and gain. A loss of Front-to-Back ratio (F/B) can occur, as well as detuning that affects antenna frequency, potentially causing increased SWR. In addition to the pattern distorting performance drop, radiation from the antenna feedline can cause interference to home and business electronics. The other very important benefit of using a wideband ferrite bead balun is to reduce received noise in certain situations. While the noise produced by many household products is normally at very low levels, sensitive ham radio receivers can be affected, which can prevents weak signals being heard. RF noise picked up on the coax cable shield will enter the antenna system feedpoint when no ferrite bead choke balun is installed at the feedpoint.
( 3 )
$108.99
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$119.99
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.
( 4 )
$207.98
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.
( 4 )
$207.98
Momobeam RFC-LI 1kW Single Core Line Isolator RF Choke Baluns
Momobeam RFC-LI 1kW Single Core Line Isolator RF Choke Baluns are efficient broadband common mode current chokes designed to ensure proper current balance and clean transitions between balanced resonant antennas—such as dipoles and Yagi antennas—and unbalanced coaxial feed lines. By delivering excellent suppression of unwanted common mode current across a wide frequency range, these RF chokes help maintain optimal antenna performance and protect sensitive station equipment. Common mode currents can cause a variety of station problems, including elevated receiver noise levels, inaccurate SWR measurements, and interference affecting nearby electronic devices or equipment within the shack. The RFC LI effectively prevents these issues by stopping common mode current from traveling on the outside of the coaxial shield, ensuring cleaner transmit and receive performance under all operating conditions.
Not Yet Reviewed
$144.99
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
Momobeam RFC-DU 5kW RF Choke Baluns
Momobeam RFC-DU 5kW RF Choke Baluns provide an excellent balance of currents and ensure a proper transition between balanced resonant antenna systems (with low SWR)—such as dipoles and Yagi antennas—and unbalanced coaxial feedlines. These RF Chokes are highly effective at suppressing common mode current from flowing along the exterior of coaxial feedlines, a condition that can cause several issues, including: - Increased noise levels - Inaccurate SWR meter readings - Interference affecting electronic devices within our shack or near the antenna system
Not Yet Reviewed
$265.99
InnovAntennas 144MHz Current Baluns
InnovAntennas 144MHz Current Baluns help to keep common mode currents off your feedline and they ensure that you get the best performance out of your antennas. These InnovAntenna baluns feature a ferrite core covered in a glue filled UV stable heat-shrink. Ring terminals allow for easy connection to the feed point of your Yagi antenna. Why use a balun? When an unbalanced coaxial feedline connects to a balanced antenna, unwanted currents can flow along the coax, distorting your antenna pattern and reducing its Front-to-Back ratio. These currents can also introduce RF interference in your home and even your neighbors' homes. Additionally, the coax can act as an antenna, picking up noise and degrading weak-signal reception. InnovAntennas 144MHz Current Baluns prevent these issues by properly matching your antenna's balanced feedpoint to your unbalanced coax system.
Not Yet Reviewed
$119.99
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
Momobeam RFC-SC Single Core 1kW RF Choke Baluns
Momobeam RFC SC Single Core 1 kW RF Choke Baluns are efficient broadband common mode current (CMC) chokes designed to ensure proper current balance and clean transitions between balanced resonant antennas—such as dipoles and Yagi antennas—and unbalanced coaxial feed lines. By delivering excellent suppression of unwanted CMC across a wide frequency range, these RF chokes help maintain optimal antenna performance and protect sensitive station equipment. Common mode currents can cause a variety of station problems, including elevated receiver noise levels, inaccurate SWR measurements, and interference affecting nearby electronic devices or equipment within the shack. The RFC SC effectively prevents these issues by stopping CMC from traveling on the outside of the coaxial shield, ensuring cleaner transmit and receive performance under all operating conditions. Thanks to its broadband characteristics, the RFC SC can be used with virtually any 50 ohm feed antenna system. It is ideal for Yagi antennas, resonant dipoles, and any installation where clean feedline behavior is essential. The choke also serves as an excellent replacement for damaged or aging 1:1 RF chokes or baluns, offering improved suppression and modern build quality. With robust performance, wide compatibility, and reliable common mode current elimination, the Momobeam RFC SC Single Core 1 kW RF Chokes provide a simple yet essential upgrade for ensuring your antenna system operates at its best.
Not Yet Reviewed
$144.99
Momobeam RFC-LI 2kW Dual Core Line Isolator RF Choke Baluns
Momobeam RFC-LI 2kW Dual Core Line Isolator RF Choke Baluns are efficient broadband common mode current chokes designed to ensure proper current balance and clean transitions between balanced resonant antennas—such as dipoles and Yagi antennas—and unbalanced coaxial feed lines. By delivering excellent suppression of unwanted common mode current across a wide frequency range, these RF chokes help maintain optimal antenna performance and protect sensitive station equipment. Common mode currents can cause a variety of station problems, including elevated receiver noise levels, inaccurate SWR measurements, and interference affecting nearby electronic devices or equipment within the shack. The RFC LI effectively prevents these issues by stopping common mode current from traveling on the outside of the coaxial shield, ensuring cleaner transmit and receive performance under all operating conditions.
Not Yet Reviewed
$180.99
Momobeam RFC-DBC Dual Big Core 4kW RF Choke Baluns
Momobeam RFC-DBC Dual Big Core 4kW RF Choke Baluns are efficient broadband common mode current chokes designed to ensure proper current balance and clean transitions between balanced resonant antennas—such as dipoles and Yagi antennas—and unbalanced coaxial feed lines. By delivering excellent suppression of unwanted common mode current across a wide frequency range, these RF chokes help maintain optimal antenna performance and protect sensitive station equipment. Common mode currents can cause a variety of station problems, including elevated receiver noise levels, inaccurate SWR measurements, and interference affecting nearby electronic devices or equipment within the shack. The RFC DBC effectively prevents these issues by stopping common mode current from traveling on the outside of the coaxial shield, ensuring cleaner transmit and receive performance under all operating conditions. Thanks to its broadband characteristics, the RFC DBC can be used with virtually any 50 ohm feed antenna system. It is ideal for Yagi antennas, resonant dipoles, and any installation where clean feedline behavior is essential. The choke also serves as an excellent replacement for damaged or aging 1:1 RF chokes or baluns, offering improved suppression and modern build quality. With robust performance, wide compatibility, and reliable common mode current elimination, the Momobeam RFC-DBC Dual Big Core 4kW RF Choke Baluns provide a simple yet essential upgrade for ensuring your antenna system operates at its best.
Not Yet Reviewed
$229.99
Momobeam RFC-DC Dual Core 2kW RF Choke Baluns
Momobeam RFC-DC Dual Core 2kW RF Choke Baluns are efficient broadband common mode current chokes designed to ensure proper current balance and clean transitions between balanced resonant antennas—such as dipoles and Yagi antennas—and unbalanced coaxial feed lines. By delivering excellent suppression of unwanted common mode current across a wide frequency range, these RF chokes help maintain optimal antenna performance and protect sensitive station equipment. Common mode currents can cause a variety of station problems, including elevated receiver noise levels, inaccurate SWR measurements, and interference affecting nearby electronic devices or equipment within the shack. The RFC DC effectively prevents these issues by stopping common mode current from traveling on the outside of the coaxial shield, ensuring cleaner transmit and receive performance under all operating conditions. Thanks to its broadband characteristics, the RFC DC can be used with virtually any 50 ohm feed antenna system. It is ideal for Yagi antennas, resonant dipoles, and any installation where clean feedline behavior is essential. The choke also serves as an excellent replacement for damaged or aging 1:1 RF chokes or baluns, offering improved suppression and modern build quality. With robust performance, wide compatibility, and reliable common mode current elimination, the Momobeam RFC DC Dual Core 2kW RF Chokes provide a simple yet essential upgrade for ensuring your antenna system operates at its best.
Not Yet Reviewed
$180.99
Momobeam RFC-LI 4kW Dual Big Core Line Isolator RF Choke Baluns
Momobeam RFC-LI 2kW Dual Core Line Isolator RF Choke Baluns are efficient broadband common mode current chokes designed to ensure proper current balance and clean transitions between balanced resonant antennas—such as dipoles and Yagi antennas—and unbalanced coaxial feed lines. By delivering excellent suppression of unwanted common mode current across a wide frequency range, these RF chokes help maintain optimal antenna performance and protect sensitive station equipment. Common mode currents can cause a variety of station problems, including elevated receiver noise levels, inaccurate SWR measurements, and interference affecting nearby electronic devices or equipment within the shack. The RFC LI effectively prevents these issues by stopping common mode current from traveling on the outside of the coaxial shield, ensuring cleaner transmit and receive performance under all operating conditions.
Not Yet Reviewed
$229.99
Momobeam RFC-DU 3kW RF Choke Baluns
Momobeam RFC DU 3kW RF Choke Baluns provide an excellent balance of currents and ensure a proper transition between balanced resonant antenna systems (with low SWR)—such as dipoles and Yagi antennas—and unbalanced coaxial feedlines. These RF Chokes are highly effective at suppressing common mode current from flowing along the exterior of coaxial feedlines, a condition that can cause several issues, including: •Increased noise levels •Inaccurate SWR meter readings •Interference affecting electronic devices within our shack or near the antenna system Each unit features two output wires of different colors to clearly identify polarity. •The light colored wire must always connect to the center conductor of the coaxial cable. •The dark colored wire must always connect to the shield braid of the coaxial cable. Correct polarity identification is important for phased array installations, while it is generally not critical when installing single antennas.
Not Yet Reviewed
$174.99
Momobeam RFC-PC 6kW RF Choke Baluns
Momobeam RFC-PC 6kW RF Choke Baluns are efficient broadband common mode current chokes designed to ensure proper current balance and clean transitions between balanced resonant antennas—such as dipoles and Yagi antennas—and unbalanced coaxial feed lines. By delivering excellent suppression of unwanted common mode current across a wide frequency range, these RF chokes help maintain optimal antenna performance and protect sensitive station equipment. Common mode currents can cause a variety of station problems, including elevated receiver noise levels, inaccurate SWR measurements, and interference affecting nearby electronic devices or equipment within the shack. The RFC-PC 6kW effectively prevents these issues by stopping common mode current from traveling on the outside of the coaxial shield, ensuring cleaner transmit and receive performance under all operating conditions. Thanks to its broadband characteristics, the RFC-PC 6kW can be used with virtually any 50 ohm feed antenna system. It is ideal for Yagi antennas, resonant dipoles, and any installation where clean feedline behavior is essential. The choke also serves as an excellent replacement for damaged or aging 1:1 RF chokes or baluns, offering improved suppression and modern build quality. With robust performance, wide compatibility, and reliable common mode current elimination, the Momobeam RFC-PC 6kW RF Choke Baluns provides a simple yet essential upgrade for ensuring your antenna system operates at its best.
Not Yet Reviewed
$434.99
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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$147.99
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$169.99