A proven and practical approach to dealing with RFI from grow lights and more.

By Tom Thompson, WØIVJ
Radio frequency interference (RFI) increased dramatically in my neighborhood
recently. Locating the sources was not easy, due in part to the distances involved.
The typical range for a consumer device that meets the applicable FCC Part 15 or
18 emissions limits is usually no more than a few hundred feet. Some of the
sources in my area, however, were more than a half-mile away. The usual “sniff”
methods weren’t practical, and without an initial heading, the sources were difficult
to find. Furthermore, they were primarily HF sources. I needed a radio direction
finder, but an HF handheld Yagi was not an option!

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