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9 Results Found For "noise"
Chelegance MAT-50 HF Mobile Antenna Magnetic Grounding Mats
Chelegance MAT-50 HF Mobile Antenna Magnetic Grounding Mats are designed to be attached to the roof or metallic parts of the vehicle, providing effective grounding for vehicle mounted HF mobile antennas. This capability reduces antenna SWR, enhances reception, and helps to reduce noise.
Not Yet Reviewed
$41.99
United Microsystems BT-75/BOG Beverage-On-Ground Antenna Transformers
The United Microsystems BT-75/BOG Beverage-on-Ground (BOG) Antenna Transformers are specifically designed for Beverage-on-Ground receive antennas and is based on the proven BT-75 transformer used with elevated Beverage antennas. Because BOG antennas are installed directly on or just above the ground, they require no supports and can be significantly shorter than traditional Beverage antennas, making them a practical option where space is limited. BOG antennas typically exhibit lower impedance than elevated Beverage antennas. The BT-75/BOG is optimized to provide proper impedance matching between the antenna and 75-ohm RG-6 coaxial cable, improving performance compared to standard Beverage transformers. For correct operation, the far end of the antenna must be terminated with a 250 to 300-ohm resistive load. The United Microsystems RXT-270 termination resistor is recommended. Properly installed Beverage antennas are low-noise, receive-only antennas that provide excellent rejection of signals and noise from the undesired direction. Due to the lower velocity factor of radio waves near the ground, a BOG antenna can often deliver a radiation pattern similar to an elevated Beverage antenna of roughly twice the length, though with reduced signal strength. A BOG antenna as short as 150 to 200 feet can provide effective receive performance, although a preamplifier may be beneficial in some installations. The BT-75/BOG is designed for use with 75-ohm RG-6 coaxial cable. Originally developed for television applications, RG-6 offers low loss at VHF and UHF frequencies, resulting in extremely low loss on the 160, 80, and 40-meter bands. Its availability and low cost make it a popular choice for low-band receive antenna feed lines. The transformer is housed in a NEMA-rated enclosure with stainless steel hardware for long-term outdoor durability. A built-in gas discharge tube across the antenna terminals helps protect the transformer from nearby lightning-induced surges, although it will not provide protection against direct or very close lightning strikes.
Not Yet Reviewed
$37.95
DX Engineering TWIG Broadcast Interference Filter
Improve the performance of your QRP POTA or SOTA station with the DX Engineering DXE TWIG BCFIL Broadcast Interference (BCI) Filter. Engineered specifically for low power amateur radio applications, this compact module effectively attenuates strong AM broadcast band signals below the 80 meter amateur band. By suppressing these out of band signals, the filter helps lower your receiver's noise floor, resulting in cleaner, more reliable reception of weak amateur radio signals. The DXE TWIG BCFIL is equipped with BNC female connectors for quick, in line installation in the field. Ideal for portable, field, and low power fixed station use, it provides an effortless way to reduce unwanted broadcast interference without adding complexity to your station setup. Features: • Blocks strong AM broadcast band and 1.8 MHz signals below the 80 meter amateur band • Improves receiver noise floor and enhances reception of desired signals • Designed for low power transceivers • Compact in line module with BNC female connectors for easy installation • Ideal for portable POTA and SOTA, mobile, and fixed low power stations Power Rating: For QRP use only — maximum 20 watts PEP. Not suitable for high power transceivers.
Not Yet Reviewed
$49.99
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
$49.99
DX Engineering Exhaust Grounding Kits
Eliminate stubborn noise in your mobile installation with DX Engineering Exhaust Grounding Kits. Many modern vehicles have individual injectors and spark plug coils for each cylinder. These units can create substantial pulses on the vehicle wiring against the ground system. Engine blocks often have a poor ground, so anything attached to them can become a radiator. The exhaust pipe is directly bolted to the engine and can be excited just like an antenna, radiating the pulsing noise. By using one of our exhaust grounding kits, you can eliminate noise from your mobile installation. All hardware in these kits is made from high quality stainless steel. Each kit includes: * Exhaust saddle clamp * 14 in. long x 0.75 in. wide x 0.125 in. thick tinned copper braid * 3/8 x 1 in. bolt * 3/8 nut * Three 3/8 external tooth washers * 3/8 flat washer * 3/8 split washer
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$31.99
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$34.99
YCCC Receive Feedline Choke Kits
Closeout- Other YCCC array components are no longer available YCCC Receive Feedline Choke Kits prevent common-mode noise or unwanted signal intrusion on the feed lines of YCCC Receive Vertical Array Kits. These choke kits are the same as provided in the array kit packages and may be used as replacements or in other applications. Component-level assembly of these kits is required. A choke enclosure is user supplied. Their function is to provide isolation between the input and output coaxial shield connections, while passing desired receive or control signals. Their isolation impedance blocks common-mode noise or unwanted signals. YCCC Receive Feedline Choke Kits are supplied with standard "F" female connectors to prevent connection to transmitting equipment. All inquiries and technical support for the discontinued YCCC kits and kit packages is handled by e-mail only, typically within two to three business days: yccctechsupport@verizon.net
Not Yet Reviewed
$22.00
Hi-Z® Antennas DL-4 V2 Long and Short Delay Cables
Hi-Z® Antennas DL-4 V2 Long and Short Delay Cables are essential components for the Hi-Z 4 Element V2 4 Square and Hi-Z 8 Element V2 Multi-Band 8 Circle Receive Array Systems. These are the high quality RG-6U coaxial cables that are precision tuned by DX Engineering and terminated with compression-style weather resistant male F connectors. These Hi-Z DL4 V2 Delay Cables must be selected and purchased separately, depending upon the desired array band coverage and corresponding size of the array, detailed below. Each are permanently connected to the 4 Square or 8 Circle Phase Controller "Long Delay" and "Short Delay" female F connectors upon array installation. SMALL ARRAY dimensions for maximized multi-band reception require the selection of one HIZ-DL-4-60-85L (Long) and one HIZ-DL-4-60-85S (Short), as recommended by Hi-Z for: * 4 Square Array with element side spacing of 60 ft. * 8 Circle Array with a diameter of 85 ft. Overall excellent cardioid patterns are achieved for enhanced, low noise reception on all three low band bands--160, 80, and 40 meters with very good receiving results on 30 meters as well. LARGE ARRAYS that are dedicated for ONLY 160 and 80 meters, one HIZ-DL-4-80-113L and one HIZ-DL-4-80-113S are for: * 4 Square Array with element side spacing of 80 ft. * 8 Circle Array with a diameter of 113 ft. Large array spacing and longer delay cable allows the user to manipulate the achieved patterns and the resulting Receive Directivity Factor (RDF) for their desired band coverage optimization. This also requires the change of four jumpers inside the respective phase controller. See the array phase controller instructions for details on jumper settings for alternative delay lines, patterns and performance.
Not Yet Reviewed
$33.99
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$48.99
Unified Microsystems Beverage Antenna Transformers
Unified Microsystems Beverage Antenna Transformers are now available. UMS transformers are built with stainless steel hardware and an F-Type coaxial connector. These transformers are fully enclosed for ultimate protection from the elements. They are corrosion resistant and sealed for many years of trouble-free use. Unified Microsystems Beverage transformers should be used with 75 ohm cable, typically RG-6, 6UF, F-6, or equivalent. H. H. Beverage described his "Wave Antenna" (the first Beverage) in the November, 1922 QST Magazine. Beverages are classic designs with well-defined characteristics and time-proven performance. Beverage antennas are among the simplest of high signal-to-noise-ratio antennas to construct. Make Unified Microsystems Beverage Antenna Transformers part of your receive-antenna system. Get yours from DX Engineering today!
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$37.95
DX Engineering RF PRO Loop Replacement Components
Since DX Engineering manufactures the RF-PRO-1B® Active Magnetic Loop Receive Antenna, we can offer these RF PRO Loop Replacement Components. Available for refurbishing Pixel, InLogis or DX Engineering Active Magnetic Loops, choose one or more of these individual "Original Equipment" components, component set or handy accessory pack that fills your needs. 1. DXE-RFPRO1B-PA Receive Preamplifier has this new part number for the preamp unit only. This is the weatherproof, metal-encased replacement RF PRO 1B Receive Preamplifier that mounts directly onto the loop bracket. Mounting hardware is not included with this replacement low-noise preamp, but it is available in the… 2. DXE-RFPRO1B-OAP Outdoor Accessory Pack. This package contains the insulated shoulder washers, flat washers and nuts to properly mount the preamp. Also included in this outdoor package for the loop installation are the mast mounting V-Bolts and Saddles and the short RG-6 F connector jumper to connect the loop to the preamp, and weather sealer. User supplied RG-6 coaxial cable is used for the long feedline that is run inside to the… 3. DXE-RFPRO1B-PI Power Inserter. This is the indoor unit that puts a well filtered and regulated 20 Vdc power onto the feedline for the preamp. It carries the loop RF to the receiver via the F connector. This unit also disables the power to the preamp when it is keyed by the transceiver amplifier keying line. The Power Inserter is run on 24 Vac from the… 4. DXE-PSW-24A-6AU AC Adapter. This clean power supply is a linear transformer that converts 120 Vac to the 24 Vac at 600 mA required by the Power Inserter. It is has the attached 2.1mm power connector. 5. DXE-RFPRO1B-IAP Indoor Accessory Pack contains the cables and adapter to connect the transceiver RF and keying lines to the Power Inserter. The F connector coaxial cable connects RF from the Inserter to the radio. A supplied F female to PL-259 adapter facilitates that connection, should you radio need it. An RCA phono patch cable is supplied for keying the Power Inserter and a RCA phono y-adapter provides the additional keying line connection for a power amplifier. 6. DXE-RF-30B Complete Component Package is for a system replacement where only an existing RF PRO 1B Loop is available. All of the above individual components, cables and hardware items listed above, items 1 through 5, but not the loop, are included in this DXE-RF-30B package. 7. DXE-PRO-LOOP is the Replacement RF PRO 1B Loop that is ordered by customers who have all other components of their system working. When your damaged or defective loop needs to be replaced, this is the loop only part to order. RF-PRO-1B® Loops may occasionally need a replacement component or hardware package. DX Engineering RF PRO Loop Replacement Components are available right here, at DX Engineering!
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$21.99
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$44.99