BIG SIGNAL RF Choke 4 kW
High-Power RF Choke for Reducing Common-Mode Currents on Coaxial Feed Lines
The BIG SIGNAL RF Choke 4 kW is a high-power RF choke designed to reduce common-mode currents that may flow along the outside surface of the coaxial cable shield in a radio installation.
Its function is to present a high impedance to common-mode currents, helping decouple the feed line from the radiating system and reduce unwanted RF, coupling, and certain types of interference that may propagate along the outside of the coaxial cable.
Type: RF choke / common-mode isolator
Power: up to 4 kW
Installation: in-line with the coaxial feed line
Primary function: common-mode current suppression
Applications: HF antennas / base stations / high-power installations / systems with unwanted RF
Purpose: improve isolation between the antenna, feed line, and station
Why Install an RF Choke?
• Reduces common-mode currents
Presents a high impedance to unwanted currents that may flow along the outside surface of the coaxial cable shield, helping prevent the feed line from acting as an unintended extension of the antenna.
• Helps reduce unwanted RF in the shack
Reducing common-mode currents can decrease the amount of RF conducted back toward the radio shack along the outside of the coaxial feed line.
• Can reduce RFI issues
By limiting unwanted RF currents on the feed line, it can help reduce certain types of interference, equipment coupling, and disturbances in electronic devices.
• Helps preserve antenna performance
Reducing unwanted participation of the coaxial feed line in the radiating system can help maintain a radiation pattern closer to the antenna's intended design.
• Improves isolation between the antenna and station
The choke provides a high-impedance barrier to common-mode currents, promoting better decoupling between the radiating system, coaxial feed line, and station equipment.
• Designed for high-power installations
The 4 kW version is specifically designed for stations and RF systems requiring higher power-handling capability.
Better Control of Common-Mode Currents
The BIG SIGNAL RF Choke 4 kW can be installed in-line with the coaxial feed line to help control common-mode currents and improve RF isolation between the antenna and station, especially in installations operating at high power levels.
• Installations with unwanted RF in the shack.
• Systems with common-mode currents on the coaxial feed line.
• Stations experiencing RFI or equipment-coupling issues.
• Antennas whose performance may be affected by unwanted radiation from the coaxial feed line.
• Installations requiring improved isolation between the antenna and station.
• Stations and RF systems operating at high power levels.
Less Unwanted RF. Better Isolation. Higher Power Handling.
The BIG SIGNAL RF Choke 4 kW is designed to provide a high-power solution for controlling common-mode currents on coaxial feed lines, helping improve isolation between the antenna and station while reducing unwanted RF that may travel along the outside of the coaxial cable.
Technical Specifications
Frequency range: 1 – 52 MHz
Impedance: 50 Ohms / 50 Ohms
Transformation ratio: 1:1
Insertion loss: < 0.1 dB
Maximum power: 4,000 W PEP
Type: high-power RF choke
Function: common-mode current suppression on coaxial feed lines
1 – 52 MHz • 4,000 W PEP • 50 Ohms • < 0.1 dB
The BIG SIGNAL RF Choke 4 kW provides an operating range of 1 to 52 MHz, maintains a nominal impedance of 50 Ohms with a 1:1 ratio, and features insertion loss below 0.1 dB, with a specified maximum power rating of 4,000 W PEP.
Construction and Materials
• RG-400 coaxial winding
The winding is made with RG-400 coaxial cable, selected for RF applications and to provide stable performance throughout the specified operating range.
• Ni-Zn toroidal core
Uses a low-initial-permeability nickel-zinc (Ni-Zn) ferrite toroid as the magnetic element to provide the required impedance to 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.
High Power. Wide Frequency Coverage. Minimal Insertion Loss.
The BIG SIGNAL RF Choke 4 kW combines an operating range of 1 to 52 MHz, insertion loss below 0.1 dB, and a specified maximum power rating of 4,000 W PEP, using RG-400 coaxial cable, a Ni-Zn ferrite toroidal core, and an 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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