BIG SIGNAL Balun 1:1 – 300 W
1:1 Current Balun for 50-Ohm Balanced Antennas
The BIG SIGNAL Balun 1:1 – 300 W is a high-performance current balun 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 50 Ohms.
Its current-balun configuration promotes a balanced current distribution between both sides of the driven element while presenting a high impedance to common-mode currents that may flow along the outside surface of the coaxial cable shield.
Type: current balun
Ratio: 1:1
Impedance: 50 Ohms / 50 Ohms
Maximum power: 300 W PEP
Application: balanced antennas with impedance close to 50 Ohms
Input: 50-ohm unbalanced coaxial feed line
Output: balanced antenna element
Primary function: current balancing and common-mode current suppression
Typical applications: dipoles / Yagis / loops / directional antennas and other compatible balanced antenna systems
1:1 • 50 Ohms / 50 Ohms • 300 W PEP
Designed to provide the transition between a 50-ohm unbalanced coaxial feed line and a balanced antenna with a similar impedance, with no nominal impedance transformation.
Why Use a 1:1 Current Balun?
• Balances current in the driven element
Promotes balanced current distribution between the two sides of a balanced antenna, providing the proper transition from an unbalanced coaxial feed line.
• Reduces common-mode currents
Presents a high impedance to unwanted currents that may flow along the outside surface of the coaxial cable shield, helping decouple the feed line from the radiating system.
• Helps preserve the radiation pattern
By limiting 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
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.
• 1:1 ratio with no impedance transformation
Designed for systems where the antenna presents an impedance close to 50 Ohms, maintaining a 1:1 ratio without nominal impedance transformation.
A More Balanced Feed for Your Antenna
The BIG SIGNAL Balun 1:1 – 300 W is especially well suited for feeding balanced antennas with impedances close to 50 Ohms from unbalanced coaxial feed lines, promoting balanced currents while reducing common-mode currents on the feed line.
• Dipoles with compatible feed-point impedances.
• Yagi antennas with balanced driven elements.
• Loop antennas with compatible feed-point impedance.
• Directional antennas with balanced feed systems.
• Installations requiring common-mode current suppression.
• Systems where improved isolation between the antenna and coaxial feed line is desired.
1:1 Ratio. Balanced Currents. 300 W PEP.
The BIG SIGNAL Balun 1:1 – 300 W combines a balanced-to-unbalanced transition with current-balun operation, helping balance currents in the driven element, reduce common-mode currents, and improve isolation between the antenna and coaxial feed line, without changing the nominal system impedance.
Technical Specifications
Frequency range: 1 – 52 MHz
Impedance: 50 Ohms / 50 Ohms
Transformation ratio: 1:1
Insertion loss: < 0.1 dB
Maximum power: 300 W PEP
Type: 1:1 current balun
Function: balanced-to-unbalanced transition and common-mode current suppression
1 – 52 MHz • 1:1 • 50 Ohms / 50 Ohms • 300 W PEP • < 0.1 dB
The BIG SIGNAL Balun 1:1 – 300 W provides an operating range of 1 to 52 MHz, maintains a nominal impedance of 50 Ohms / 50 Ohms with a 1:1 ratio, and features insertion loss below 0.1 dB, with 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, contributing to current-balun operation and common-mode current suppression.
• 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.
1:1 Ratio. 300 W PEP. Minimal Insertion Loss.
The BIG SIGNAL Balun 1:1 – 300 W combines a 1:1 ratio, 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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