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.  In most cases, 8 turns on an FT240-31 (of RG58 or RG142 depending upon power requirements) will suffice.  12 turns is better for a <15MHz aerial setup.

Ferrite Toroid Chart

 

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31-Mix Snap-On Ferrite
This snap-on ferrite is a serious item - It's a 31-mix ferrite that is ideal for use as a mains filt..
£17.50
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)..
£2.75
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 line-isolators. More than enough for UK legal power so perfect for your QRO ba..
£8.25
Ferrite Toroid FT240-43
For use in baluns and line-isolators. More than enough for UK legal power so perfect for your QRO ba..
£6.75
Ferrite Toroid FT68-43
A micro ferrite toroid for the QRP operator - this is perfect for small Baluns/Chokes and End-Fed ..
£1.00
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