BN-73-302 Ferrite Core Toroid 2500µi RF Double Hole 10pcs
BN-73-302 Ferrite Core Toroid 2500µi RF Double Hole 10pcs
BN-73-302 Ferrite Core Toroids – 2500µi RF Double Hole Core (10pcs)
Upgrade your RF and radio frequency projects with these high-quality BN-73-302 Binocular Ferrite Core Toroids. Featuring a 2500µi permeability rating and a compact double-hole (binocular) design, these cores are ideal for winding baluns, chokes, RF transformers, and SWR applications in amateur radio, shortwave, and general electronics builds.
Key Specifications
- Model: BN-73-302 (American Type)
- Permeability (µi): 2500
- Dimensions: 13.3 × 10.3 × 7.5 mm
- Hole Size: 4 mm
- Color: Black
- Shape: Double Hole (Binocular / Stick)
- Type: Permanent Ferrite (Rare Earth Composite)
- Package Includes: 10 pieces
- Country of Origin: Made in Mainland China
Why Choose These Ferrite Cores?
- ✅ High 2500µi Permeability — Excellent inductance per turn for efficient RF filtering and noise suppression
- ✅ Double-Hole Binocular Design — Makes winding baluns and RF chokes fast and consistent
- ✅ Compact Form Factor — Fits neatly into tight PCB layouts and hand-wound coil assemblies
- ✅ Broad Frequency Coverage — Suited for HF, VHF, and general RF choke / RFC applications
- ✅ Brand New & High Quality — 100% new components, consistent batch quality
Common Applications
- RF baluns and ununs for amateur (ham) radio antennas
- SWR (standing wave ratio) bridge construction
- Radio frequency chokes (RFC) and common-mode choke winding
- Shortwave and HF transmitter/receiver builds
- EMI/RFI suppression in electronic circuits
Build Your Project Right
Whether you are a seasoned ham radio operator or an electronics enthusiast working on your first RF project, these BN-73-302 toroids give you a reliable, consistent core to work with. The binocular format simplifies winding compared to traditional ring toroids, making your builds cleaner and faster.
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Frequently Asked Questions
Q: What is the permeability of the BN-73-302 ferrite core?
A: The BN-73-302 ferrite core has a permeability rating of 2500µi (microinitial permeability), making it highly effective for RF choke and balun winding in the HF frequency range.
Q: What are binocular / double-hole ferrite cores used for?
A: Double-hole (binocular) ferrite cores like the BN-73-302 are commonly used for winding RF baluns, ununs, common-mode chokes, RF transformers, and SWR bridge components. The dual-hole format allows wire to pass through multiple times with fewer turns, making winding quick and straightforward.
Q: How many pieces are included in one order?
A: Each package contains 10 pieces of the BN-73-302 binocular ferrite core, each measuring 13.3 × 10.3 × 7.5 mm with a 4 mm hole size.
Q: Are these cores compatible with the American BN-73-302 standard?
A: Yes. These cores are manufactured to match the American BN-73-302 specification, making them drop-in compatible with designs and winding guides that call for the standard BN73-302 binocular ferrite core.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.