How much power will a balun made from an FT140-43 handle?

The maximum power has to do with the permeability of the material and the field strength your coil generates. If you exceed the maximum power, you won't damage the unit, but will incur losses as the ferrite material is saturated and cannot support an increased magnetic field. I'm using a single FT140-43 for a 49:1 UNUN (16 gage wire) running at 10 watts max for portable field operations, and it works very well for this application. According to my calculations, it could handle up to 37.5 watts CW or 60 watts SSB. If you need more power, I would recommend stacking two FT140-43s, and you could double the power, i.e. 120 watts SSB / 75 watts CW. If you're looking for even higher power, I would look at using an FT240-43 or FT240-52 core.

What is the country of origin?

Faur-Rite Brand (the manufacturer) FT140-43 are manufactured in China.

Where do you put these , on the wire or somewhere else ? I see some say wrapping the wire , do you run it in and out of the ring ?

Yes you run it in and out of the ring as many times as it can.

Can this be used for long wire unun balun? some sites suggest t-130 hence the question.

Yes. I wrapped mine with #12 antenna wire as a choke between my elevated radials and earth ground. Major improvement to my signal strength. K5AE

Desertcart Logo

Deliver to Philippines

For best experience Get the App

DOWNLOAD THE APP

WE SOURCE ITEMS FROM

UAE
UK
India
USA
Japan
KOREA

Customer Services

About Us

Customer Support

Description

⚙️ Elevate your circuit game with precision ferrite power!

BULK PACKAGING FOR PROS - Ideal for engineers and makers who demand volume and value
LIGHTWEIGHT YET DURABLE - At just 59g, it balances robustness with easy handling
WIDEBAND FREQUENCY SUPPORT - Optimized for transformers and RFI suppression from 5 to 500 MHz
PRECISION ENGINEERED DIMENSIONS - Ensures seamless integration with your custom circuits
PREMIUM TYPE 43 FERRITE MATERIAL - Delivers superior magnetic performance and minimal losses

The Amidon FT-140-43 Ferrite Toroid Core is a high-performance Type 43 ferrite core designed for wideband transformers and RFI suppression across 5 to 500 MHz. With precise dimensions (OD 35.55mm, ID 23mm, Height 12.7mm) and a high AL value of 885 ±20%, it offers reliable magnetic properties for professional-grade electronic applications. Lightweight at 59g and supplied in bulk packaging, it’s tailored for engineers and tech innovators seeking quality and efficiency.

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

₱2973

Duties & taxes incl.

Philippinesstore

Free Returns

30 daysfor PRO membership users

15 dayswithout membership

Secure Transaction

ChatGPT - opens in a new tab Perplexity - opens in a new tab Claude - opens in a new tab Grok - opens in a new tab Google AI - opens in a new tab

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

View all Trustpilot reviews

Manufacturer	FAIR-RITE
Part number	FT140-43
Item Weight	59 g
Product Dimensions	5.08 x 2.54 x 5.08 cm; 58.97 g
Item model number	FT140-43
Material	Type 43 Ferrite
Measurement System	English
Batteries included?	No
Batteries Required?	No

Amidon FT-140-43 Ferrite Toroid Core 43 Material

Description

Specifications

Have a Question? See What Others Asked

Common Questions