51 RF Chokes & Filters ISO-PLUS Ethernet RF Filter Give yourself another tool to help you pull out those weak signals and operate more eff ectively. DX Engineering has designed a simple way to suppress electromagnetic interference (EMI) and reduce common-mode RF interference (RFI) to and from Ethernet cables used between your personal computers, printers, routers, cable modems, transceivers and other devices. This interference is a common problem on Gigabit Ethernet Cat5e and Cat6 cables used for network LAN connections. The patent pending ISO-PLUS is an inline Ethernet filter that joins two RJ-45 connectors together to fight common-mode RFI and EMI noise interference for radio frequencies from well below 1 MHz to over 100 MHz. Installed on either end of Ethernet cables, ISO-PLUS filters mitigate RFI caused to the Ethernet-connected device. At the same time they reduce interference to radio receivers and other Ethernet devices that is caused by RFI or EMI generated by an Ethernet-connected device. The ISO-PLUS provides common mode attenuation resulting in reduced or eliminated EMI or RFI caused by power supplies, wall power adapters, touch lamps, appliances, and just about anything else near RJ-45 cables. The RF filters do not aff ect Ethernet data signal levels or speed. Each ISO-PLUS comes with one shielded RJ-45 patch cable (about six inches). The filters work with Cat5, Cat5e, Cat6 and Cat6a cables with RJ-45 connectors. Available in sets of two or ten filters. The ISO-PLUS units do NOT pass DC voltages and do not support PoE (Power over Ethernet). DXE-ISO-PLUS-2 Ethernet RF Filter, 2 Units ....................................................$81.99 DXE-ISO-PLUS-10 Ethernet RF Filter, 10 Units ................................................$355.99 Iron Powder Cores DX Engineering now carries popular material numbers and sizes of iron powder core toroids that can be used by amateur radio operators to build cost-eff ective RF inductors for MF to UHF circuit board applications, as well as for RF suppression. Their low permeability makes iron powder inductor cores preferred over ferrite in high- temperature environments inside hot equipment. Further, inductors wound on iron powder cores produce less electromagnetic interference to adjacent circuits. Choose from #2 (250 kHz-10 MHz) and #6 (3-40 MHz) toroids in packs of 5, 10, or 25. Enter “Powder Core” at DXEngineering.com for more details. DXE-TPC02-05-25 Toroid, #2, 250 kHz-10 MHz, 0.5" O.D. Pack of 25 ................$30.99 DXE-TPC02-157-10 Toroid, #2, 250 kHz-10 MHz, 1.57" O.D. Pack of 10 ..............$49.99 DXE-TPC02-225-5 Toroid, #2, 250 kHz-10 MHz, 2.25" O.D. Pack of 5 ................$70.99 DXE-TPC06-03-25 Toroid, #6, 3-40 MHz, .307" O.D. Pack of 25 .........................$25.99 DXE-TPC06-05-25 Toroid, #6, 3-40 MHz, 0.5" O.D. Pack of 25 ...........................$25.99 UNUNs The RU-1-1 1:1 UNUN helps remove unwanted RF from the coax cable shield. This 200W PEP common-mode RF choke is ideal for short coax cable runs or non-resonant antennas. The RU-1-1 features SO-239 sockets for both input and output. The RU-9-1 UNUN allows easy interface of vertical and end-fed antennas to the LDG line of automatic antenna tuners. This 200W PEP UNUN may also be used for many antenna projects where a 4:1 or 49:1 UNUN is needed. LDG-RU-1-1 1:1 UNUN, Coax Choke ......................................................... $29.99 LDG-RU-9-1 9:1 UNUN, Interface for Vertical and End-Fed Antennas ... $29.99 Baluns and UNUNs Built to benefit a range of antenna systems, Chameleon Baluns and UNUNs are designed to enhance impedance transformation and signal eff iciency while minimizing interference. Each unit features an FT-240-43 toroidal core precisely wound with PTFE-insulated, 14 AWG enameled copper wire; durable weatherproof housing; and top-mounted stainless steel eyebolt that provides a secure anchor point for base or portable operation. Check individual devices for antenna compatibility. CHA-UNUN-BALUN-1 1:1 Current Balun, 1-100 MHz, 50 Ω Input, 1,000W PEP ......................................................................$114.99 CHA-UNUN-BALUN-4 4:1 UNUN, 1-52 MHz, 200 Ω Input, 1,000W PEP ............$114.99 CHA-UNUN-BALUN-6 6:1 UNUN, 1.5-70 MHz, 300 Ω Input, 1,500W PEP .........$114.99 CHA-UNUN-BALUN-9 9:1 UNUN, 1.5-30 MHz, 450 Ω Input, 1,200W PEP .........$114.99 CHA-UNUN-BALUN-9 4:1 High Power UNUN for Non-Resonant Vertical Antennas Using non-resonant multi-band antennas? This UNUN helps your antenna system operate at maximum eff iciency by minimizing transmission line losses caused by SWR. You can add this UNUN to any 43 foot antenna system; it covers 1.8-30 MHz and can handle 2 kW CW/5 kW SSB. A feedpoint connection kit is available separately. DXE-UN-43 High Power 4:1 UNUN .....$201.99 DXE-UN-BRKT-5A UNUN Mounting Kit ........... $18.99 Wire Antenna Balun Mounting Bracket Kit for Maxi-Core® 20 Baluns Mounting your balun correctly is critical to maintaining its reliability. Here's the right solution to make sure your balun is ready to face Mother Nature—the Wire Antenna Balun Mounting Bracket Kit. To ensure proper balun operation, DX Engineering created this mounting kit designed specifically for single-band wire antenna setups. At the heart of each kit is a nearly indestructible mounting bracket made from a UV-resistant poly-resin compound. You’ll also get a pair of DX Engineering end insulators, along with all the stainless hardware required for installation. Its unique design provides minimum capacitive coupling between the antenna wire and the field surrounding the balun core. The DXE-WA-BMB is compatible with all Maxi-Core® 20 baluns and legacy Comtek baluns. DXE-WA-BMB Wire Antenna Balun Mounting Bracket Kit ..........................$29.99 EMI/RFI DC Filters The EF1 and EF2 high-performance EMI/ RFI DC filtering systems from VE2DX help eliminate linear and external RF and EM interference from switching power supplies, generators, DC converters, and other power sources. The EF1 features Anderson Powerpoles and supports 45 amps; the EF2 uses 1/4"-20 bolts and supports 65 amps. Tested at 90 amps, the filters feature 9-18VDC operations; shielded enclosure; multiple layers of internal shielding, with up to eight on the central axis; Input and Output stages consisting of three multi-frequency filtration sections that eliminate noise from DC or ground signals (DC Power is then sent through a high-current RF with low loss); and four frequency filtration ranges. VEX-EF1EMIFILTER EMI/RFI DC Filter, 45 Amps, Powerpoles ............................$115.99 VEX-EF2EMIFILTER EMI/RFI DC Filter, 65 Amps, 1/4"-20 Bolts ..........................$115.99 CM7 Common-Mode Feedline Choke Made in the USA, this 50 Ω inline 1:1 common-mode feedline choke consists of seven mix-31 ferrite beads and 240 series (RG-8X) Ultra Flex coax with SO-239 Female and PL-259 Male connectors. Designed to solve some of the most common issues that can negatively impact antenna system tuning and performance, the CM7 provides 35-40 dB of attenuation from 1-300 MHz. Simply install the 18.25" CM7 at the feedpoint of your antenna and attach your existing coaxial cable to the opposite end. It can be used with many popular antenna types, such as EFHW, dipoles, random wires and verticals, to improve tuning consistency and antenna performance. REZ-CM7 Inline 1:1 Common-Mode Feedline Choke, 50 Ω, UHF Male to UHF Female .............................................$61.00 49:1 UNUN The BL-49 UNUN from CG Antenna is an outdoor HF antenna feedpoint transformer that's particularly suitable for building end-fed half-wave antennas. It is built with heavy-gauge wire and a large toroidal ferrite core which handles up to 600W PEP over the entire range from 1.8-30 MHz. Its waterproof case is made from high-strength plastic and features a valve to drain off condensation while preventing insects from getting inside. A stainless steel eye-hook at the top provides an attachment point for a support rope. Also on top is a stainless steel stud and wing nut for the antenna wire. A bottom-mounted SO-239 and a second wing nut allow the installation of an optional counterpoise wire or ground connection. CGA-11365-49 49:1 UNUN ...........................................................................$349.99 USB Isolator Surge Protection Device DX Engineering's USB Isolator (DXE-ISO-USB) is an inline solid-state device that provides surge protection between two USB 2.0 devices, typically a transceiver and a computer. It protects a transceiver from a voltage surge coming from the computer, and vice versa, protects a computer from a surge from a transceiver. A passive device that requires no power, the USB Isolator has two ports, one USB A and one USB B. It is bi-directional, so it can be installed in either direction. The supplied 19.7" USB A to USB B standard patch cable can be reversed and used for either type of equipment connection with the opposite connector to the mating port on the ISO-USB. A user-supplied cable must have the opposite mating connector for the ISO-USB, and its other end must have the USB connector type that provides connection to the second piece of equipment or computer. The device's maximum USB 2.0 speed is 480 Mbps. Backwards compatible with USB 1.0/1.1/12 or 480 Mbps. This supports RS-232 COM port data speeds faster than the 115,200 bps baud rate selection found in most USB capable equipment. The device does not support USB C GB/s data speeds and does not pass suff icient DC current for charging or powering a device. Enter "ISO-USB" at DXEngineering.com for more details. DXE-ISO-USB USB Isolator Surge Protection Device ................................$129.99 Check out our YouTube channel for in-depth tech tips and product demos!
