BIG SIGNAL Balun 2:1 – 300 W
2:1 Current Balun for Matching Balanced Antennas to 50-Ohm Coaxial Feed Lines
The BIG SIGNAL Balun 2:1 – 300 W 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
Impedance: approximately 112 Ohms / 50 Ohms
Maximum power: 300 W PEP
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
2:1 • 112 Ohms / 50 Ohms • 300 W PEP
Designed to match balanced antennas with impedances close to 112 Ohms to 50-ohm coaxial feed lines, combining impedance transformation with current-balun operation.
Why Use a 2:1 Current Balun?
• Transforms impedance
Its 2:1 ratio allows balanced antennas with an impedance close to 112 Ohms to be matched to a nominal 50-ohm coaxial feed line.
• Balances current in the driven element
Promotes balanced current distribution between the two sides of the balanced element, providing the proper transition from an unbalanced coaxial feed line.
• Reduces common-mode currents
Helps limit unwanted currents that may flow along the outside surface of the coaxial cable shield, promoting better decoupling of the feed line from the radiating system.
• Helps preserve the radiation pattern
By reducing unwanted participation of the coaxial feed line in the radiating system, it can help maintain a radiation pattern closer to the antenna's intended design.
• Improves feed-line isolation
Its current-balun operation helps decouple the coaxial feed line from the radiating element, reducing the possibility of the outside of the shield becoming an unintended part of the antenna system.
• Can reduce unwanted RF in the shack
Reducing common-mode currents can decrease RF conducted toward the radio room along the outside of the coaxial cable and may help reduce certain RFI and equipment-coupling issues.
Impedance Matching and Balanced Antenna Feeding
The BIG SIGNAL Balun 2:1 – 300 W is especially well suited for feeding balanced antennas with impedances close to 112 Ohms from 50-ohm coaxial feed lines, combining impedance transformation with current balancing and common-mode current suppression.
• Dipoles with compatible feed-point impedances.
• Loop antennas requiring a 2:1 transformation.
• Directional antennas with balanced driven elements.
• Systems requiring a transition from a higher balanced impedance to 50 Ohms.
• Installations requiring common-mode current suppression.
• Systems where improved isolation between the antenna and coaxial feed line is desired.
2:1 Transformation. Balanced Currents. 300 W PEP.
The BIG SIGNAL Balun 2:1 – 300 W combines impedance transformation with current-balun operation, helping match balanced antennas with impedances close to 112 Ohms to 50-ohm coaxial feed lines while promoting balanced currents and helping 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: 300 W PEP
Type: 2:1 current balun
Function: impedance transformation, balanced-to-unbalanced transition, and common-mode current suppression
112 / 50 Ohms • 2:1 • 1 – 52 MHz • 300 W PEP • < 0.1 dB
The BIG SIGNAL Balun 2:1 – 300 W is designed to provide impedance transformation between an impedance close to 112 Ohms and a 50-ohm coaxial system, with an operating range of 1 to 52 MHz, insertion loss below 0.1 dB, and a specified maximum power rating of 300 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 level.
• Ni-Zn toroidal core
Uses a low-initial-permeability nickel-zinc (Ni-Zn) ferrite toroid as the balun's primary magnetic component to provide impedance transformation and the required current-balun performance.
• 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 the specified power level.
2:1 Transformation. 300 W PEP. Minimal Insertion Loss.
The BIG SIGNAL Balun 2:1 – 300 W combines a nominal 112-to-50-Ohm transformation, an operating range of 1 to 52 MHz, insertion loss below 0.1 dB, and a specified maximum power rating of 300 W PEP, using a PTFE-protected copper winding, Ni-Zn ferrite toroidal 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.
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