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This is a map generated by the RFI Mapper program by W4DD.? I used my Yaesu FT-857, a cheap GPS unit, and a CAT cable connected to a laptop as I drove around my neighborhood.? This was my first attempt.? The FT-857 only has 10dB increments over S-9, so anywhere there is a black marker, it is at least 10dB over S-9, but not 20dB.

I measured on 10 meters, AM mode, Fast AGC, no noise reduction switched on.? The color legend on the left corresponds to S meter readings.? The blue marker near the center is my QTH.? The other blue marker slightly to left is my initial suspect power pole. ? There were a few dropouts while I was driving which may be responsible for a couple of anomalies.? I still need to do some more work pinpointing the source.? Many private roads and driveways in this area that I haven't looked at yet.? Most have power poles.