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Antennas : 6M : 6 meter Yagi Antennas

  • 2 element Yagi for 50 MHz - This 6 meter 2 element yagi antenna is simple, compact and effective antenna for 50 Mhz. The design antenna was optimized with AO for best match to 50 ohms, no matching network. A choke balun is recommended to decouple feedline currents.
    [ Hits: 532 | Votes: 3 | Rating: 3 ]
Antennas : Baluns
  • Baluns in antenna systems - Understanding Baluns. This article explores some simple antenna system configurations and the effect of key system components, connections and dimensions on feed line common mode current.
    [ Hits: 1106 | Votes: 2 | Rating: 2.5 ]
  • Common Mode Currents on Coax - These baluns are used to attenuate the common mode current that flows on the outside of the coaxial feed line.
    [ Hits: 176 | Votes: 0 | Rating: 0 ]
  • Unun vs Balun - Configurations and differences - If you ever asked if you need an Unun or a Balun this article is for you. The right question should be do I need a feed line choke or an impedance transformer whose output is configured as balanced or as unbalanced. An impedance transformer can be configured as a voltage transformer or as a current transformer.
    [ Hits: 342 | Votes: 3 | Rating: 6.67 ]
  • Baluns and common mode chokes - Voltage baluns versus Current baluns. When to use them, differences, and typical usage in feeding antennas, or in resolving radio frequency interferences.
    [ Hits: 401 | Votes: 1 | Rating: 10 ]
Antennas : Baluns : 4 to 1 balun
  • 1:4 Current Balun - This project is intended to aid in tuning a balanced antenna or feedline that has a high impedance 100-600 ohms
    [ Hits: 3414 | Votes: 5 | Rating: 8 ]
Antennas : Feed Lines
  • Antenna current meter - How to measure antenna feed balanced lines currents
    [ Hits: 756 | Votes: 3 | Rating: 8.67 ]
  • Feed Line Currents for Neophytes - This paper discusses the sources of feed line currents and the methods used to control them.
    [ Hits: 340 | Votes: 0 | Rating: 0 ]
  • Common mode currents - Common mode currents can flow in all sorts of systems, not just antenna feed lines. This article explain how Common mode noise can be isolated from the desired signal
    [ Hits: 316 | Votes: 1 | Rating: 8 ]
Antennas : Feed Lines : Choke
  • 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: 3410 | 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: 3246 | Votes: 6 | Rating: 3.83 ]
Antennas : J-Pole
  • 6 m JPole Antenna - Based on original G2BCX design this J-Pole antenna for the six meter band is made with a homemade ribbon cable. The antenna shown in this article includes a coaxial cable choke feed to remove RF currents from flowing on the outer of the cable.
    [ Hits: 1767 | Votes: 6 | Rating: 6 ]
Antennas : OCF
  • OCF Dipoles - About windom antennas and OCF dipoles, tricks on covering more bands moving feed-points and potential problems. Problems caused by common mode currents in OCF dipoles
    [ Hits: 670 | Votes: 0 | Rating: 0 ]
  • OCF Dipole - 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: 2558 | Votes: 7 | Rating: 9.43 ]
Antennas : Receiving
  • Chokes and Isolation Transformers for Receiving Antennas  new - Chokes and isolation transformers are essential for receiving antennas to mitigate common mode current, which induces noise and interferes with signal quality. Common mode chokes, formed by winding feedline through ferrite cores, block unwanted current effectively. Proper selection of core material and winding turns ensures resonance near the operating frequency, reducing interference. Isolation transformers further minimize interference, crucial for multi-transmitter stations.
    [ Hits: 52 | Votes: 1 | Rating: 9 ]
Internet and Radio : Live streaming
  • Florida DSTAR repeater live feed - Listen to the DSTAR Repeater from Florida USA currently connected to Reflector 1c
    [ Hits: 4985 | Votes: 21 | Rating: 2.82 ]
Shortwave Radio : Broadcasters
  • Radio Vlaanderen International - Current program schedules, RealAudio feeds, and listening tips from Belgian Public Radio which broadcasts worldwide in Dutch, German, French and English.
    [ Hits: 638 | Votes: 0 | Rating: 0 ]
Software : Antenna analysis
  • Balun_cmr Calculate common-mode impedance - This EXCEL Program Worksheet calculates the common-mode impedance of a 1:1 Guanella (current) balun which is placed at the feed point of a balanced antenna system fed via coax.
    [ Hits: 400 | Votes: 1 | Rating: 10 ]
Technical Reference : Radio Frequency Interference
  • 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: 855 | Votes: 5 | Rating: 6 ]
Technical Reference : Test Equipment
  • R.F. Current Meter - This R.F. current meter was developed to assist in measuring line currents in balance feed lines as used in the All Band HF Antenna.
    [ Hits: 625 | Votes: 1 | Rating: 1 ]

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