Locating RF Interference at HF

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.

A free program, Audacity, will enable you to make an excellent audio recording from your receiver audio output. 3 Finding the RFI Source Once you have an idea of what might be causing the RFI problem, you still need to find the source. Figure 1 shows a block diagram of the HF RDF system that I use. Grow light RFI is often prevalent in the

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