Locating RF Interference at HF

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Locating RF Interference at HF. A proven and practical approach to dealing with RFI from grow lights and more. Tom Thompson, W IVJ longer ranges, however, the noise might be ing set to LINE, the RFI might be power line Radio frequency Interference (RFI) in- heard only at HF. So, HF RDF to get you related. creased dramatically in my neighborhood in VHF range can be a real time saver. See RFI from consumer devices that appears recently. Locating the sources was not for at regular intervals across the band likely easy, due in part to the distances involved. more information. comes from a switching-mode power sup- The typical range for a consumer device I also found that RFI from consumer de- ply. If the noise is pulsing it could be a bat- that meets the applicable FCC Part 15 or vices can be problematic.

QST® – Devoted entirely to Amateur Radio www.arrl.org November 2014 33 Locating RF Interference at HF A proven and practical approach to dealing with RFI from grow lights and more. Tom Thompson, WØIVJ Radio frequency interference (RFI) in-

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