BIG SIGNAL Balun 2:1
2:1 Current Balun for Matching Balanced Antennas to 50-Ohm Coaxial Feed Lines
The BIG SIGNAL Balun 2:1 is a high-performance current balun with a 2:1 impedance transformation ratio, designed to provide the proper transition between a 50-ohm unbalanced coaxial feed line and a balanced antenna or driven element with an impedance close to 112 Ohms.
In addition to providing impedance transformation, its current-balun configuration promotes a balanced current distribution between both sides of the driven element and helps limit common-mode currents that may flow along the outside surface of the coaxial cable shield.
Type: current balun with impedance transformation
Ratio: 2:1
Application: balanced antennas with impedance close to 112 Ohms
Feed line: 50-ohm coaxial cable
Primary function: impedance transformation, current balancing, and common-mode current suppression
Typical applications: dipoles / loops / directional antennas and other compatible balanced antenna systems
Why Use a 2:1 Current Balun?
• Transforms impedance
Its 2:1 ratio allows balanced antennas with a higher feed-point impedance to be matched to a conventional 50-ohm coaxial feed line, providing the proper transition between the two systems.
• Balances current in the driven element
Helps maintain symmetrical current distribution between both sides of a balanced antenna, allowing the antenna system to operate more closely to its intended design.
• Reduces common-mode currents
Helps limit unwanted currents that may flow along the outside surface of the coaxial cable shield, reducing unwanted participation of the feed line in the radiating system.
• Helps preserve the radiation pattern
By reducing unwanted radiation from the coaxial feed line, it can help minimize asymmetry and distortion of the antenna's radiation pattern.
• Improves feed-line isolation
Provides a more controlled transition between the unbalanced coaxial feed line and the balanced antenna element, helping electrically decouple the feed line from the radiating system.
• Can reduce unwanted RF in the shack
Reducing common-mode currents can help minimize RF conducted back toward the radio shack along the outside of the coaxial feed line, as well as certain RFI and equipment-coupling issues.
Impedance Matching and Balanced Antenna Feeding
The BIG SIGNAL Balun 2:1 is especially well suited for feeding balanced antennas with a feed-point impedance close to 112 Ohms from a 50-ohm coaxial feed line, combining impedance transformation, current balancing, and common-mode current suppression in a single device.
• Dipoles with compatible feed-point impedances.
• Loops and loop antennas requiring a 2:1 transformation ratio.
• Directional antennas with balanced driven elements.
• Systems requiring a transition from 50 Ohms to a higher balanced impedance.
• Installations where common-mode current suppression is required.
• Stations requiring improved isolation between the antenna and coaxial feed line.
2:1 Transformation. Balanced Currents. Better Control of Your Antenna System.
The BIG SIGNAL Balun 2:1 combines impedance transformation with current-balun operation, helping match balanced antennas to 50-ohm coaxial feed lines, balance driven-element currents, and reduce common-mode currents.
Technical Specifications
Frequency range: 1 – 52 MHz
Input impedance: 112 Ohms
Output impedance: 50 Ohms
Transformation ratio: 2:1
Insertion loss: < 0.1 dB
Maximum power: 2,000 W PEP
Type: 2:1 current balun
Function: impedance transformation, balanced-to-unbalanced transition, and common-mode current suppression
112 / 50 Ohms • 1 – 52 MHz • 2,000 W PEP • < 0.1 dB
The BIG SIGNAL Balun 2:1 is designed to transform an impedance of approximately 112 Ohms to 50 Ohms, with coverage from 1 to 52 MHz, insertion loss below 0.1 dB, and power handling up to 2,000 W PEP.
Construction and Materials
• Copper winding with PTFE insulation
The winding is made from high-quality copper protected by heavy-duty PTFE tubing, selected to provide stable RF performance and handle the specified power levels.
• Ni-Zn toroidal core
A low-initial-permeability nickel-zinc (Ni-Zn) ferrite toroid is used as the primary magnetic component to provide impedance transformation and the required behavior against common-mode currents.
• Stainless steel hardware
Fastening hardware is made from stainless steel, providing mechanical strength, corrosion resistance, and long-term durability.
• SO-239 connector with PTFE insulation
Equipped with an SO-239 connector featuring PTFE insulation, suitable for RF applications and high power levels.
2:1 Transformation. Wide Frequency Coverage. Minimal Insertion Loss.
The BIG SIGNAL Balun 2:1 combines an impedance transformation of approximately 112 to 50 Ohms, an operating range of 1 to 52 MHz, insertion loss below 0.1 dB, and power handling up to 2,000 W PEP, using a PTFE-protected copper winding, Ni-Zn ferrite core, and SO-239 connector with PTFE insulation.
The purchase of the products is always made on request. We manufacture all products, so manufacturing times can be added. That is why the final price of the purchase, as the final price of the shipping costs will be confirmed in an email sent afterwards.
The form of payment will be made once the email is received, so at all times you can cancel the order informing us of the process.
ES
EN
No reviews for this article yet. Be the first to add one.