Ferrites

Ferrite toroids and snap-on chokes for audio and HF purposes - we stock several types of toroid for HF Baluns/Chokes as well as the 31-mix "Problem Solver" which makes a great mains-filter and ad-hoc choke. We also have 5mm+9mm snap-on "domestic" ferrites for taming audio/Hi-Fi/USB issues when near strong RF.  The following chart shows how different ferrite materials perform across HF.  The green band indicates "resistive", which is desired for best performance.  As you can see, 8 turns of coax on an FT240-31 will suffice.  Coax can be RG316, RG58, RG8 "mini" or RG142 depending upon your power requirements.

Ferrite Toroid Chart

 

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31-Mix Snap-On Ferrite
If you're in need of a mains filter or ad-hoc RF choke, this snap-on 31-mix ferrite is a serious ite..
£14.00
5mm Snap-on Ferrite Clip
A 5mm Snap-on ferrite clip for keeping RF out of keyboards/mice and other Shack peripherals. Works w..
£0.75
9mm Snap-on Ferrite Clip
A 9mm Snap-on ferrite clip for keeping RF out of keyboards/mice and other Shack perhiperals. A few l..
£1.00
Ferrite Toroid FT140-43
A small ferrite toroid for use in baluns and line-isolators. 8 turns of RG174 (100w) or RG316 (400w)..
£3.00
Ferrite Toroid FT140-61
A small ferrite toroid for use in the G3TXQ 1:4 CobWeb balun. 175w AM/Digi, 250w SSB (assuming..
£3.00
Ferrite Toroid FT240-31
For use in baluns and chokes/isolators. More than enough for UK legal power so perfect for your QRO ..
£7.00
Ferrite Toroid FT240-43
For use in baluns and line-isolators. More than enough for UK legal power so perfect for your QRO ba..
£6.50
Ferrite Toroid FT240-61
A large ferrite toroid as used in our QRO CobWeb balun (2 ferrites are required if you're making you..
£10.00
Ferrite Toroid FT68-43
A micro ferrite toroid for the QRP operator - this is perfect for small Baluns/Chokes and End-Fed ..
£1.00
Flat Core Ferrite 43-mix
A flat-core ferrite used for making coaxial "patch-lead" chokes as detailed in GM3SEK's "In Practice..
£4.50
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