Radio Noise from Internal/External Sources at Radio Receiving Sites is a set of free E-Books created by the Department of the Navy. I finally located the Internal RFI source suppression link to this public domain document. I looked at the pdf for help in tracking down the RFI at my home QTH. Both of these documents strikes me as one of the nicer pair of items I have seen over the past few years dealing with RFI and how to deal with it. These documents cover all aspects of RFI created within your environment, and external to your environment. The two books are a very good fit for each other. They also cover some basic RFI location techniques. These book starts with a background and general approach chapter, and progresses forward in a clear and easy to read process, showing you how and where to look for RFI. Here is a brief excerpt from the internal sources book.
This document was prepared because of the widespread lack of valid technical
information about site performance at all levels of receiving-site operation. For example,
the information about grounds and grounding available to site personnel was especially
confusing and often downright incorrect.
Complex analytical procedures have been avoided to make the text as readable as
possible, but it is assumed the serious reader will have a good knowledge of the physical
laws related to basic electricity. This includes an understanding of the flow of electricity
in complex circuits, some understanding of the impact of reactive impedance on the flow
of electricity, a basic knowledge of the properties of electric and magnetic fields
surrounding conductors carrying electric current at both low and high frequencies, and
the inductive and capacitive coupling of current and voltage from one conductor to
The basic principles of noise and interference mitigation techniques are also included.
The integrated use of electromagnetic barriers, filters and grounds to confine
electromagnetic noise to its source device is described. This is an effective technique to
mitigate identified sources. Practical mitigation examples are described as well as
Click below for either the internal or external free books: