unbalanced

unbalanced

Antennas : 40M : 40 meter Dipole Antennas

• 40m loaded dipole - This is an short dipole for 7 MHz. Total length of this dipole is just 10 meters, 33 feet. Missing lenght is balanced by a coil made of 49 turns of a 40mm diameter pvc pipe. The use of a choke balun is recommended, as always, to adapt the unbalanced coax cable to the balanced antenna, and to prevent RF feed back along the coax shield.
  [ Hits: 194 | Votes: 4 | Rating: 8.75 ]

• Balun Theory  ^pop - The word balun means balanced-unbalanced: it's used to adapt a balanced device to an unbalanced one, read more basic thory on Ununs and Baluns
  [ Hits: 38165 | Votes: 33 | Rating: 6.73 ]
• HF Home made Balun  ^pop - A balun is a device that is used at the feedpoint of a balanced antenna when an unbalanced feedline is desired to feed the antenna. Balun is a contraction for BALanced to UNbalanced.
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• Magnetic Long Wire UnUn 9:1 - An impedance transformer (9:1) to feed a high impedance long wire (~450 ohm), down to a 50 ohm unbalanced coaxial input.
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• Antenna Theory : Baluns - This article describe the principles of baluns when referred to devices used to balance unbalanced systems, like a coax cable and a dipole antenna
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• 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 ]
• 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: 345 | Votes: 3 | Rating: 6.67 ]
• 9:1 Unun Impedance Transformer - A 9:1 unbalanced to unbalanced (unun) impedance transformer based on a published design by Peter VK6YSF.
  [ Hits: 195 | Votes: 1 | Rating: 4 ]

• Multi-Band End-Fed Antenna Design for Limited Space  ^new - This document details the construction of a multi-band end-fed antenna, suitable for situations with limited space for larger antennas. The design utilizes a 1:49 to 1:60 impedance transformer to match a half-wave wire antenna fed at one end. Compared to a traditional dipole, this antenna resembles a highly unbalanced Windom antenna with one very long leg and a virtual short leg. The design eliminates the need for radials but relies on the coax cable shield for grounding. The document recommends using at least 10 meters of coax and installing a common mode filter at the entry point to the shack for improved performance.
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• Chocking the End-Fed Antenna - Stop common-mode current when transmitting with an end-fed antenna. Unbalanced antennas are very prone to currents on the outside of the coax.
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• The EZ-Tuner - The "EZ-Tuner" is a homebrew automatic legal-limit antenna tuner that covers all amateur HF bands from 160-10 meters. Using a T-network design and controlled by a BASIC Stamp BS2sx microcontroller, the EZ-Tuner will match at least a 16:1 VSWR for either unbalanced or balanced transmission lines.
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• Homebrew Antenna Tuner - A simple T-network that can match any unbalanced antenna system by AA5TB
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• A 100W Z-Match for 160m to 10m - This is a project by F5IMV devided to build a balanced Z-match, capable of matching an unbalanced 50 ohm transmitter output into an antenna fed by balanced feeders.
  [ Hits: 2072 | Votes: 5 | Rating: 6.4 ]

• The UnTenna - Multiband random wire unun (unbalanced to unbalanced) for use with rigs with builtin autotuners.
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• CWS ByteMark - CWS ByteMark's Baluns (Balanced to Unbalanced) and Ununs (unbalanced to unbalanced) transformers are developed jointly with Dr. Jerry Sevick, W2FMI, who is known worldwide for his work on transmission line transformers
  [ Hits: 1043 | Votes: 3 | Rating: 4.33 ]

• Balanced microphones with Kenwood TS-590S - Wiring a Balanced Microphone to the TS-590S Unbalanced Microphone Input
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• T-Pad / H-Pad Resistance Calculator - This calculator is designed to give resistor values for unbalanced T-pads, and for balanced H-pads.
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• Common mode current - Balanced and Unbalanced Systems
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