Tubular feed line chokes (a.k.a. coax line isolators) are convenient for insertion in the coax feed line at the antenna feed point or the station entrance and they include an optional ground lug and static bleeder for attachment to a ground rod. Very useful as coax line isolators along a long coax feed line to break up resonances every 1/2 wavelength. Very wide bandwidth, up to 45db common mode suppression ensures transmitted signal stay on antenna when installed at antenna feedpoint or that common mode coax braid noise is reduced when receiving weak signals when installed at radio end of coax. 500/1500/5000 watt options and various frequency ranges available.
Ferrite Ring Mini Combo Pack, FT240 - 1.4" ID, 3 Rings - Mix 31, 61, 75, RFI Range .15-2000 MHz
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 |
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 |
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.
