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9 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
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 High CMI Receive Feedline Chokes
DX Engineering High CMI Receive Feedline Chokes achieve exceptionally high isolation between the input and output connector shields to effectively block common-mode RF noise and unwanted signals that collect on 50 or 75 ohm receive antenna feedlines. Ongoing research and development by the design team at DX Engineering has produced two bidirectional Receive Feedline Chokes; a 50-ohm model with BNC female connectors and a 75-ohm model with Type-F female connectors. Both chokes cover the RF frequency range 100 kHz through 30 MHz. They exhibit very high common mode impedance* (CMI typically over 8,000 ohms across the 160, 80, and 40 meter bands) and feature DC pass capability up to 700 mA at 13.8VDC, with extremely low SWR and negligible insertion loss. Affordable DX Engineering High CMI Receive Feedline Chokes will be considered the best, most versatile receive chokes ever produced for typical low band receive antenna applications.
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$59.99
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$64.95
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 Clifton Laboratories Z10000 Buffer Amplifiers
DX Engineering Clifton Laboratories Z10000 Buffer Amplifiers may be the products most often requested by radio experimenters and electronics enthusiasts. These are the very popular circuits, designed by Jack Smith, K8ZOA (SK), that are crucial for adding a SDR receiver and panadapter display capabilities to a receiver or transceiver which lacks that feature. The Z10000 Buffer Amplifier's high-input impedance can safely tap the early-stage broadband Intermediate Frequency (IF) signal from inside your radio and feed the buffered and amplified low impedance IF signal to your external SDR receiver. It can then produce a spectrumscope - waterfall display pattern of the receiver signals on a compatible tablet or monitor and PC that is running the appropriate third party SDR software. DX Engineering offers two Clifton Labs Buffer Amplifier Kits to add an IF output SMA connector to the rear panel of your radio: * The DXE-Z10000U-KIT is the Universal Buffer Amplifier Kit that covers 50 kHz to 100 MHz. This kit is designed for those willing to do an internal modification, and will output the IF signal of virtually any receiver or transceiver that has an IF in that range. However, the DXE-Z10000U-KIT can be used as a buffer and low-gain preamp between any low level RF devices that operate in that range. As a buffer, this circuit provides over 90dB of reverse isolation to protect the IF stages of the radio from possible birdies on an SDR receiver input. So, even if your radio has an IF output connector, the DXE-Z10000U-KIT may be used externally, with a user-supplied shielded metal enclosure, to be certain to maintain proper radio operation. * The DXE-Z10000K2-KIT is the Buffer Amplifier Kit specifically tuned to the 4.915 MHz IF signal of the Elecraft K2 transceiver. It offers the same high reverse isolation, plus the added benefit of a tuned IF input with a narrower bandwidth of operation and a potentially a lower noise floor on the output. Both Buffer Amp kits contain the updated, completely assembled and tested DX Engineering Z10000C PC Board with a nominal 6.5 dB gain, retaining all the benefits of the reliable original Z10000B boards. Both kits include our finished printed circuit board, required coaxial cables assemblies with special connectors, insulating materials, and hardware—all for an easier installation than ever before! A third party SDR receiver, software (typically free) and compatible tablet or PC and monitor are required to make use of the IF signal provided by the Z10000 Buffer Amplifier and see the signals that your old radio can hear. Due to the high number of specialized radio installations, no printed instructions are included with these buffer kits. Instructional web links are found on the part detail webpages. Installation web documents and videos are only available online. The legacy that was built by Jack Smith, K8ZOA (SK), with Clifton Laboratories, lives on with select products, exclusively from DX Engineering. NOTE: DX Engineering cannot provide electronic technical support of devices installed in user radios and is not responsible or liable for damages that occur to a user radio due to improper or erroneous techniques during the installation of this product. Unplug all electronic devices when working on them and observe all electrical safety and electrostatic discharge precautions when opening sensitive electronics. Modification of a radio should only be attempted by individuals with advanced experience on electronic circuit repair and operation.
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$51.99
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$61.99
DX Engineering HF QRP Bandpass Filters
DX Engineering HF QRP Bandpass Filters are designed to tightly confine both transmitted and receive signals to one specific Amateur band, these filters significantly reduce out of band noise, resulting in a noticeably lower noise floor and improved weak signal reception. In multi operator contest or portable operations, they deliver the essential isolation needed to eliminate image and harmonic interference, ensuring clean mono band performance even in close quarters environments. Each filter features a sharp roll off just outside the band edges, providing exceptional rejection of adjacent band signals and maintaining maximum operating efficiency for QRP applications. Offered for the 80, 40, 20, 15, and 10-meter amateur bands, they install easily in line with the coax feedline using the BNC connectors provided on each end. With power ratings of 20 watts SSB and 5 watts digital, they are ideal for QRP enthusiasts participating in multi operator events such as Field Day, POTA, and SOTA.
Not Yet Reviewed
$69.99
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 NCC-1 Receive Filter Sets
DX Engineering announces a series of NCC-1 Receive Filter Sets, a breakthrough option for owners of the NCC-1 Receive Antenna Phasing Unit. These advanced plug-in filter module sets offer frequency-specific receive antenna system enhancements for the NCC-1. All filter modules sets are available in matched pairs of low-pass, band-pass and high-pass frequency ranges. Filter cut-off and center frequencies correspond to the major Amateur bands, 160, 80, 40, 20, 15 and 10 meters, with filter module insertion loss of only about 1 dB. Highly regarded by many owners and engineers to be the best receive phasing and noise canceling unit available, the DX Engineering NCC-1 is used extensively by enthusiasts in Amateur Radio DXing, Contesting, AM DXing, and Short-Wave Listening (SWL), and is also used in commercial AM and HF broadcast applications. DX Engineering NCC-1 Receive Filter Sets add a new dimension of functionality to the NCC-1, for advanced directional noise and signal nulling performance, enhanced with specific frequency range operations. By default, NCC-1 filter slots are jumpered to pass all signals. On the NCC-1 front panel, the BAND toggle switch "L" or "H" positions each activate one of two filter pair slots, allowing over 360 degrees of phase rotation in two frequency ranges. The BAND switch "L" position covers from 850 kHz to 8 MHz. The BAND switch "H" position covers from 2 MHz to 15 MHz. Frequencies outside these ranges will have less than 360 degrees of phase rotation. NCC-1 Receive Filter Sets must be placed into the proper BAND filter slots corresponding to desired usage. NCC-1 Receive Filter Sets are pairs of filters (2 of the same type), so both NCC-1 receive antenna inputs "A" and "B" exhibit the same pass-band characteristics. Band-pass, high-pass or low-pass filters are available for users to choose and install into their NCC-1 for their desired application. By reducing or excluding frequency-specific interfering noise and signals, the noise floor of the desired pass-band can be lowered for dramatically improved reception. You can install one set or two sets, depending on your desired filtering. NCC-1 "L" and "H" slots may be populated with pairs of band-pass, high-pass, or low-pass filters to suit the specific signal rejection needs of the discerning operator. As an example, an 80 meter DX enthusiast may elect to install two 80 meter band pass NCC-1 Receive Filters, part number DXE-NCCFL-BPF80M, into their NCC-1 "L" BAND slots. This would dedicate their NCC-1 to 80 meter-only operations. Setting the BAND switch to "L" would dramatically reduce noise and signals from outside the 80 meter band, very effectively excluding interference from nearby AM Broadcast, 160 and 40 meter stations. A much lower noise floor on 80 meters could be achieved for dramatically enhanced reception of weak 80 meter DX signals. An additional pair of filters could be installed into the "H" BAND slots, to enhance reception on the higher HF bands. For example, installing 20 meter high pass filters, part number DXE-NCCFL-HP20M, and switching to BAND H would drastically reduce all received noise and signals from frequencies below 13.70 MHz. With advanced planning of additional filter availability, an NCC-1 owner could even swap different filter sets for optimal operations in different contests or band pursuits. Note: Whenever the DX Engineering "Documentation" tab is available, please look at the associated files for additional product information. All NCC-1 Receive Filter Sets displayed here are also conveniently listed on a single page in the link tab called "Documentation." Order one or two DX Engineering NCC-1 Receive Filter Sets for your unit and enjoy the best possible performance from your NCC-1.
Not Yet Reviewed
$79.97
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$82.97
DX Engineering Receive Filter Plug-In Modules
DX Engineering Receive Filter Plug-In Modules provide frequency-specific receiving system enhancements, which fit into special DX Engineering devices listed below. These advanced plug-in filter modules are available separately to allow any user to create a specific or customized filter with low-pass, band-pass and high-pass frequency ranges. Filter cut-off and center frequencies correspond to the major Amateur bands, 160, 80, 40, 20, 15 and 10 meters, with filter module insertion loss of only about 1dB. By reducing or excluding frequency-specific interfering noise and signals, the noise floor can be lowered for the desired passband for dramatically improved reception DX Engineering Receive Filter Plug-In Modules may be installed in these devices: DXE-DMC-2 Dual Module Chassis accepts one or two filter modules to create a stand-alone passive inline filter unit of any configuration. One high pass and one low pas can be combined to create a multi-band bandpass filter of any HF range. DXE-RPA-2-PM Modular Receive Preamplifier accepts one Receive Filter Plug-In Module to customize the preamplifier passband. DXE-NCC-2 Receive Phasing Controller can accept one or two Receive Filter Plug-In Modules, one into each, Channel A and Channel B. The DX Engineering NCC-2 is highly regarded by many owners and engineers to be the best receive phasing and noise canceling unit available and is used extensively by enthusiasts in Amateur Radio DXing, Contesting, AM DXing, and Short-Wave Listening (SWL), and is also used in commercial AM and HF broadcast applications. DX Engineering Receive Filter Plug-In Modules add an extra dimension of functionality to the NCC-2, for advanced directional noise and signal nulling performance, enhanced with a specific frequency range operations. By default, NCC-2 internal option slots have bypass boards to pass all signals. Receive Filters placed into these slots dedicate the unit to filtered operation. Typically, one pair of band-pass or high-pass or low-pass filters, depending on desired filtering, is installed in the NCC-2 to suit the specific signal rejection needs of the discerning operator. As an example, an 80 meter DX enthusiast may elect to install two 80 meter band pass Receive Filter Plug-In Modules, part number DXE-R-BP80-PM, into their NCC-2 Channel A and Channel B middle slots. This dedicates their NCC-2 to 80 meter-only operations. This dramatically reduces noise and signals from outside the 80 meter band, very effectively excluding interference from nearby AM Broadcast, 160 and 40 meter stations. A much lower noise floor across 80 meters can help achieve reception of weak 80 meter DX signals. An additional pair of filters can be swapped out for a different band when desired. Note: Whenever the DX Engineering "Documentation" tab is available, please look at the associated files for additional product information. All Receive Filter Plug-In Modules displayed here are also conveniently listed on a single page linked in Documentation.
Not Yet Reviewed
$54.99