Kurt Sterba’s Korner

Ferrite Ring Mini Combo Pack, FT240 - 1.4" ID, 3 Rings - Mix 31, 61, 75, RFI Range .15-2000 MHz

SKU FRCP-240-3
In stock
Product Details

Not sure of your interference RFi frequency? Then try using each of the mixes on your RFI problem to determine which one works the best. This Ferrite Ring Mini-Combo Pack is a convenient solution for troubleshooting RFI/EMI from unknown frequencies or multiple frequencies that require multiple suppression mixes. Included in this combo pack are three 2.4″ OD/1.4″ ID ring toroids as follows:

Mix 75 effective from .15-10 MHz including AM Broadcast band – quantity: 1

Mix 31 effective from 1-300 MHz for general purpose – quantity: 1

Mix 61 effective from 200-2000 MHz for cell phone, WIFI, HDTV, Cable TV interference – quantity: 1

Individually wrapped and labeled with effective RFI frequency range for easy identification

The ring toroids are useful for AC/DC common mode choking with multiple turns as shown below

AC Cable on F-240 Toroid - 7 turns

AC Cable on F-240 Toroid – 7 turns

DC Cable on F240 - 4 turns

DC Cable on F240 – 4 turns

The ring toroids can also be used on coax or signal lines as shown below:

RG58 12 turns on FT240-43 for 4000-6000 ohms choking impedance

RG58 12 turns on FT240

Ethernet Cable on F-240 Toroid - 7 turns

Ethernet Cable on F-240 Toroid – 7 turns

For RFI/EMI wrap as many turns as possible (usually 6-12) for higher choking (under 30 MHz). For over 25-100 MHz, 1-3 turns om Mix 61 is usually sufficient. Chokes can also be cascaded in series to offer a broader frequency range.

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