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 75 effective from .15-10 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

Kurt Speaks Out - Digital PDF Version - Download Now!

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Kurt Speaks Out - Digital PDF Version - Download Now!
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MPN: KSO-PDF

KURT SPEAKS OUT - Digital PDF Version

Kurt's masterpiece contains 50 of Kurt Sterba's Kolumns from World Radio (1990 to 2006). 140 pages packed with sage advice, unusual antennas, and ham radio myths to avoid. Read, learn, and enjoy.

Included are unusual antennas: CCD, T2FD, OCF, Rattail Ver-Tee, G5RV, ZEPP, Loops and many others. Find out the real truth about antennas and STOP WASTING YOUR TIME and MONEY trying to get the lowest SWR! Download your copy and get educated by one of the experts – Krusty ole Kurt!!

Eham Review

Kurt N Sterba, sometimes known as “Krusty Olde Kurt” or “The Krusty One” and often as “The Masked Avenger”, is fearless in exposing antenna manufacturers who lie or use deceptive numbers to inflate the gain dB’s of their antennas. He also deflates those who use “new scientific breakthroughs” to explain the operation of their products. He pieces through the obfuscation of on-the-air antenna “experts” by explaining antennas, grounds, and feed lines in non-mathematical, simple English. His aim is to see that all understand the real basics of antennas, and are not taken in by the ever-prevalent, fine-sounding ad writers and other purveyors of false information.

Kurt wants you to know that downloading this work of art also entitles you to a free membership in KURTSKLUB, special product discounts, his oh-so-smart newsletter when he gets around to writing it, and more sage advice in his future books. You agree to keep your email box open, your mind free from commercial marketing hoop-la and let Kurt be your guide. Oh yea, spread the word, we need more members who seek true enlightenment like you!


Table of Contents

This version is published by Palomar Engineers, Inc.


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

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AC Cable on F-240 Toroid – 7 turns

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DC Cable on F240 – 4 turns

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

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RG58 12 turns on FT240

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Ethernet Cable on F-240 Toroid – 7 turns

For RFI/EMI wrap as many turns as possible for higher choking (under 30 mHz).