Ferrite Ring Combo Pack

The Ferrite Ring 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 ten 2.4″ OD/1.4″ ID ring toroids as follows:

Mix 77 effective from .1-50 MHz including AM Broadcast band – quantity: 3

Mix 31 effective from 1-300 MHz for general purpose – quantity: 4

Mix  61 effective from 200-2000 MHz for cell phone, WIFI, HDTV,  Cable TV interference – quantity: 3

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 for higher choking (under 30 mHz).  For over 30 MHz, 1 -3 turns is usually sufficient due the to capacitive effect of multiple turns reducing choking effect.