Overview

JNCRADIO JBALUN-915, 1.8-30MHZ 500W RF BALUN CHOKE ISOLATOR, 1:1 CURRENT COAXIAL CHOKE FOR HF RADIO COMMON MODE NOISE SUPPRESSION

89.00$

Full HF Coverage 1.8-30MHz – Complete amateur radio HF band coverage.
500W Stable and Cool – Aluminium housing helps dissipate heat for practical on-air operation.
Aircraft-Grade Aluminium Housing – 6061 hard-anodised aluminium for strength and durability.
51 High-Permeability Mn-Zn Ferrite Beads – 3×17 bead layout for effective common-mode current suppression.

Are You Dealing with Any of These Common RFI Problems?

Does your TV turn on by itself when you transmit?
Do your USB devices disconnect during contest operation or high-power transmitting?
Do you hear RF feedback or hash in your microphone audio?
Does your Wi-Fi drop out when you get on the air?
Are you fighting common-mode noise and stray RF on an end-fed antenna?

If any of these sound familiar, JBALUN-915 may be the RF choke your station needs.

JBALUN-915 is a 1:1 current choke RF isolator designed to be installed inline with 50-ohm coaxial feedline. It provides stable operation across the full 1.8-30MHz HF range and is rated at 500W PEP for practical amateur radio use.

Built with an aircraft-grade aluminium housing for improved heat dissipation, JBALUN-915 stays cooler during extended 500W operation, and the published rating reflects practical tested use rather than a theoretical peak claim.

Made from 6061 hard-anodised aluminium for durability, mechanical strength, and long-term outdoor suitability.

JBALUN-915 also helps reduce unwanted RF interaction with station equipment. Its 51 high-permeability Mn-Zn ferrite beads in a 3×17 layout provide effective common-mode current suppression while preserving normal antenna operation.

How It Works

In a real station, RF energy does not always stay only on the intended antenna path. When common-mode current is present on the outside of the feedline, part of the RF can travel along the coax shield, equipment chassis, or other unintended paths in the operating area.

This unwanted RF is often behind many common interference problems, including equipment disruption, audio RF feedback, USB instability, stray RF in the shack, and inconsistent antenna performance.

JBALUN-915 helps control common-mode current on the feedline so the feedline radiates less and more RF energy stays on the path where the antenna is intended to do the work.

Recommended Installation Location

Install the JBALUN-915 inline with the feedline, as close to the transceiver as practical.
In special RFI cases, the installation position may be adjusted based on station layout and feedline behaviour.

Installation Steps

Connect the coax from the antenna to one end of the JBALUN-915.
Use a short coax jumper to connect the other end of the JBALUN-915 to the transceiver.
Make sure all coax connections are tight and secure.
Check antenna SWR at low power, typically under 10 watts, before full-power operation.

Typical Applications

A Solid Choice for Contest Stations
For contest stations where clean audio, stable RF performance, and reduced shack RF matter, JBALUN-915 helps keep the feedline under control.
A Practical Upgrade for Indoor Antenna Setups
If you operate from an apartment, HOA-restricted property, or other indoor setup, JBALUN-915 can help reduce unwanted RF in the shack.
Well-suited for End-Fed Antennas
End-fed antennas such as EFHW systems are often more sensitive to common-mode current, making a feedline choke especially useful.
Also Useful with Dipoles and Vertical Antennas
JBALUN-915 is not limited to end-fed antennas. Dipole and vertical antenna systems can also benefit when unwanted RF is present on the feedline.
Built for Mobile and Portable HF Operation
For mobile, portable, RV, and field operation, the aluminium housing adds mechanical strength and long-term durability.

Specifications

Spec Item	Details
Model	JBALUN-915
Frequency Range	1.8-30MHz
Power Rating	500W PEP
Connector Type	UHF Female
Housing Material	6061 Hard Anodised Aluminium
Ferrite Bead Configuration	51 high-permeability Mn-Zn ferrite beads (3×17 layout)
Internal Coax	RG303 Coax (15cm built-in)
Contact Plating	Nickel-Plated Copper + PVDF
Dimensions	6.7 in L × 1.5 in Dia
Weight (Without Packaging)	0.3KG / 0.66LB
Design Feature	Designed to help preserve normal antenna tuning and performance
Recommended Applications	Fixed station, mobile use, indoor and outdoor operation

Shipping And Returns

Shipping:

We have several shipping options for our products, including next-day and Saturday/Sunday delivery for certain items. Please see these options at checkout.

Returns:

If you have any equipment that needs to be returned to Martin Lynch & Sons, please fill out the form below:

Click here for returns form

Upon receipt of goods you have 14 days to return goods however the goods must be returned in original packaging and care must have been taken with the goods you wish to return. Under distance selling regulations you are not entitled to any refund on carriage charges or modification charges made at your request. Large items cannot be returned if they have been assembled, unless faulty.

Warranty Terms and Conditions

Outside of the 14 faulty return period, returned items cannot be accepted, unless covered by manufacturer's warranty. We will repair as much as possible on site however in exceptional circumstances products may have to be returned to the manufacturer of distributor.

For repairs/replacements under manufacturer’s warranty for any item please download a ML&S return form from the link above and return to ML&S with the faulty product.

International Warranty information

Warranty service for items we sell is available in the U.K. only, unless otherwise noted. It is your responsibility to pay freight for returned items to the U.K. and back to you for desired warranty coverage. All of our NEW products come with a minimum 12 month warranty, (Yaesu & Icom 24 months), with up to 90 days on second-hand equipment. Items returned for service must state "returned goods for repair" on the return air waybill or U.K. import customs duties apply and will be added to your invoice. For more info about returning items please contact our customer help desk, [email protected]