Example: dental hygienist
Locating RF Interference at HF
diagram of the HF RDF system that I use. Grow light RFI is often prevalent in the 40 meter band, but a Yagi antenna is obviously not practical. A short dipole has directional characteristics only for horizontally polarized signals. RFI from consumer devices seem to be mostly verti-cally polarized. Besides, the short dipole
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