Ferrite Ring Combo Pack, FT240 - 1.4" ID, 10 Ferrites - Mix 31, 61, 77, RFI Range .1-2000 MHz
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 .1-10 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
The ring toroids can also be used on coax or signal lines as shown below:
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.