balun 2 1

balun 2 1

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• Lightweight 144 MHz Yagi antenna - A Lightweight 2m Yagi for SOTA. The boom is 20mm PVC electrical conduit and the elements are 2.4mm aluminium TIG welding rod. The antenna is carried as a single length of conduit with the elements stowed inside the boom, sealing them in with a bung. The driven element is connected directly to 50 Ohm coax with a BN-43-202 balun core to decouple the coax shield.
  [ Hits: 178 | Votes: 0 | Rating: 0 ]

• When and Where to Use Baluns - Baluns are usually used by Hams to feed dipole antennas with 50 ohm coax and to transpose from ladder line feeding a multi-band antenna to the unbalanced input of an antenna tuner.
  [ Hits: 1522 | Votes: 9 | Rating: 7 ]
• A Short Course On Baluns - An interesting article on basics about Baluns, intoducing the skin effects on radio frequency currents and its effects on receiving and trasmitting article by VE7FO
  [ Hits: 347 | Votes: 1 | Rating: 10 ]
• 50:450 Ohm (9:1) Balun for vertical antennas - A page describing how to home made a custom 9:1 balun for a common portable wire antenna. The author suggest to use 4C65 or FT140-61 toroids instead of the common Amidon T200-2
  [ Hits: 516 | Votes: 11 | Rating: 6.72 ]
• Build your own HF balun - A balun is a MUST for dipoles or similar antennas when they are feed with coaxial cable. From the RF point of view, the shield can be modeled as two conductors, the internal shield (the real shield, this is, ground) and the external shield, who is really far to be ground. In this way, your dipole has 3 arms, the two from the dipole and the coaxial cable shield (external face)
  [ Hits: 248 | Votes: 1 | Rating: 10 ]
• BalUn for Delta-loop & Quad-loop antennas - This Guide helps you to build the 1:2 BalUn 600 Watts DIY kit step by step. If a delta-loop or quad-loop antenna is powered with a coax cable from the transceiver it is necessary to use a 1:2 BalUn. This 1:2 BalUn uses a symmetrical 1:2 impedance transformer.
  [ Hits: 286 | Votes: 1 | Rating: 9 ]
• How to Blow Up Your Balun - In this article, author examine stresses placed on common-mode chokes (aka baluns) as hams use/abuse them, examine the efficiency of simple dipole multi- band antennas and their feed systems. Stressing a Balun.
  [ Hits: 387 | Votes: 0 | Rating: 0 ]

• Guanella Current 4:1 Balun  ^updated - A large picture with construction details of a homebrew guanella current balun 4:1
  [ Hits: 1769 | Votes: 16 | Rating: 6.81 ]
• 4:1 QRO Balun - A home made 4:1 Ferrite QRO Bal-un with a FB 241-61 Type K
  [ Hits: 813 | Votes: 5 | Rating: 6 ]
• 4 to 1 Balun - 4:1 FB 3061 ROD x 2 balun can handle 125 Watts
  [ Hits: 915 | Votes: 6 | Rating: 6.5 ]

• DIY CobWebb Antenna - A DIY guide to build your own compact multiband HF antenna based on the G3TXQ version using a 1:4 balun. This article includes the full part list and instructions to assembly, including the center plate.
  [ Hits: 1005 | Votes: 6 | Rating: 7.5 ]
• Cobweb Antenna - A home made cobweb antenna project made with easy to find parts 2-14 AWG speaker cables which are cut to 1/2 wavelength for each band and junction box with 4:1 Balun
  [ Hits: 264 | Votes: 4 | Rating: 10 ]

• 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 ]

• End Fed Antenna with a 1:64 Matching Network - In this experiment the autor is going to explore the use of a 1:64 matching network on the End Fed Long Wire Antenna. Experiment will consist in build a 80-40-20-15-10 meter End Fed Long Wire Antenna with a 1:64 matching network from the documentation available on the internet
  [ Hits: 872 | Votes: 15 | Rating: 6.73 ]

• OCF Dipole - A279;This is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. It is a dipole fed off center with a 4:1 current balun at the offset feedpoint. The antenna shown covers 80, 40, 20 and 10 meters with 15 meters and WARC bands
  [ Hits: 2559 | Votes: 7 | Rating: 9.43 ]

• T2FD Antenna - Terminated and twisted folded dipole - T2FD is a 600-900 ohms folded dipole, terminated with resistor. Feed impedance is coupled with 50/600 ohms voltage balun. It is a wide band antenna with rather low SWR over the full designed frequency range: antenna tuner is seldom needed.
  [ Hits: 487 | Votes: 0 | Rating: 0 ]

• The Easy Way Antenna Systems - This document is a must read for anyone considering building a good low cost HF multi-band antenna system. The author combine in this document four important ingredients to produce simple but effective antenna system, like antennas of non resonant length, line attenuation, the transmatch and the balun
  [ Hits: 632 | Votes: 2 | Rating: 4.5 ]

• Build your own Windom Antenna - Building a Windom HF Antenna. A PDF file presentation about homebrewing a windom antenna for the HF bands with formulas for 40 and 80 meters bands and step by step guide on making a 4:1 balun to feed the antenna.
  [ Hits: 768 | Votes: 2 | Rating: 10 ]

• mini Ring-Core-Calculator - Calculate windings on ferrite cores - The program can be used to calculate inductors (coils) and their number of turns on ferrite cores, ferrite shells and air coils. These can be used for baluns, Ununs, bandpass filters, low pass filters, resonant circuits, and more. The technical specifications of the cores are already integrated in the program. Application is free and runs on Windows 32 bit versions only. To make it run on Windows 10 64 bit need to be unzipped in a single folder.
  [ Hits: 396 | Votes: 1 | Rating: 1 ]

• The myth of SWR causing coax radiation - There are several reasons that can cause coax line radiation, most of them are related to wrong or missing use of a balun, but none can be imputed to load mismatch.
  [ Hits: 752 | Votes: 2 | Rating: 6 ]

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