hf choke

hf choke

Antennas : 20M : 20 meter Yagi antennas

• 2-Element-Yagis for HF  ^pop - 2-Element parasitic Yagis for the Shortwave-Bands 10-12-15-17-20-30m. The antennas are feeded with the DK7ZB-match. A quarter-wave choke of coax is grounded at the socket.
  [ Hits: 50051 | Votes: 146 | Rating: 7.08 ]

• Choking balun for 160-30 meter band - Choking balun for lower HF and MF bands. (1.8MHz - 10MHz). Requiring a choking balun to isolate the potential RF pick up on the coax cable as it runs past equipment such as computer within the radio room at lower HF and MF frequencies a simple method of winding RG58 coax onto a Powdered Iron Toroid Core was constructed.
  [ Hits: 196 | Votes: 3 | Rating: 6 ]
• QRP Balun: A DIY Project - DIY project of a QRP Balun. Using a high permeability ferrite rod and an old B&W dipole center insulator, he constructs a choke type balun for QRP use. The balun aims to create as much inductance as possible at HF, offering a high impedance to common mode currents
  [ Hits: 59 | Votes: 0 | Rating: 0 ]

• Guanella 1:1 VHF choke balun - A model of a Guanella 1:1 VHF choke balun using a FT140-61 core
  [ Hits: 3620 | Votes: 9 | Rating: 3.11 ]

• How to construct a multi-band dipole using speaker wire - How to homemade a multi-band HF dipole using 100 meter of speaker wire, 2 strandsm including a homebrew 1:1 choke balun
  [ Hits: 879 | Votes: 1 | Rating: 10 ]

• Homebrew RF chocke - Magnetic Longwire Balun - RF Choke to prevent hf currents on the feedline. This Magnetic Longwire Balun (MLB) makes it possible to efficiently use a coaxial lead-in cable with all forms of longwires, T-forms or other types of wire antennas, without the need for an antenna tuner.
  [ Hits: 3415 | Votes: 3 | Rating: 10 ]
• RF choke or 1:1 balun - RF Choke to prevent hf currents on the feedline or...1:1 Choke Balun, sometimes called the "UGLY BALUN"
  [ Hits: 3248 | Votes: 6 | Rating: 3.83 ]
• High Performance common-mode chokes - May 2015 Radcom Article on common-mode chokes that can be used for control cables, phone lines, but mostly on typical HF antenna systems. This article explain what common mode chokes does, why you meay need one, properties common mode chokes should have, how to build and measure performances.
  [ Hits: 687 | Votes: 1 | Rating: 10 ]
• A High Performance RF Choke for the HF bands - Home brewing a high performance, high power common mode choke for HF bands
  [ Hits: 152 | Votes: 0 | Rating: 0 ]

• Space-Efficient Excellence: Inverted L Multi-Band HF Antenna - Discovering a solution for limited space, the inverted L HF antenna emerges as a stellar performer. Half the size of a dipole, it ensures optimal installation in restricted areas, maintaining superb transmission (TX) and reception (RX) characteristics. Spectrum Communications' multi-band version, featuring traps, proves even more space-friendly without compromising performance. A fiberglass pole offers sturdy support, while proper grounding, an RF choke, and occasional tuning contribute to a high-performing and reliable antenna system.
  [ Hits: 186 | Votes: 0 | Rating: 0 ]

• DIY Dual Band 144-440 MHz vertical antenna - A homemade VHF/UHF vertical antenna made essentially with RG58 coax cable, with a 9 turns choke balun to prevent the shield acting as a RF Radiator.
  [ Hits: 1376 | Votes: 14 | Rating: 5.5 ]

• Radiodan - W7RF - BIRD RF power measuring, new and used, HENRY RF power amplifiers (used HF amps), TOHTSU coaxial relays, SAMLEX power supplies, RFI chokes reduce interference, Parts parts, tubes, Used amplifiers, radios, antennas and accessories, Los Angeles, CA.
  [ Hits: 2070 | Votes: 3 | Rating: 10 ]

• Measured Data For HF Ferrite Chokes - FT-240 toroids measurements. The data was measured using well-calibrated HP instrumentation. All plots have been adjusted to a frequency range of 1-100 MHz on the horizontal axis and a resistance/impedance range of 10-1,000 ohms on the vertical axis. This adjustment facilitates comparison among different materials and aids in determining their suitability for use on the HF ham bands.
  [ Hits: 38 | Votes: 0 | Rating: 0 ]

• Build an All Band HF Air Core Choke Balun - The main function of the Ugly Balun is to help eliminate rf currents from flowing on the outside of coaxial cable using the principle of choke action.
  [ Hits: 792 | Votes: 12 | Rating: 7.84 ]
• Cost-effective ferrite chokes and baluns - In this article the author describes some new designs of ferrite loaded chokes for suppressing unwanted common mode currents at HF applied to feed lines like choke baluns, but also in the shack, applied to various coaxial, mains and data cables
  [ Hits: 864 | Votes: 5 | Rating: 6 ]

• miniVNA PRO Modifications - The mini Radio Solutions miniVNA PRO is the only affordable vector network analyser (VNA) I know of that offers remote wireless operation. This is very interesting because it allows to measure the input impedance of HF antennas installed at height without having to deal with coax cable lengths, baluns nor common mode suppression chokes. However, to render the miniVNA PRO truly field proof, it requires a number of significant modifications.
  [ Hits: 136 | Votes: 5 | Rating: 7.8 ]