I took my Yaesu FT991A to my daughter’s house last week. Once again, I was unpleasantly confronted with a very high noise floor on the radio. At times, it was so bad that I couldn’t hear hardly anyone. As the short video describes, it turns out to be a classic example of EMI (Electro Magnetic Interference). In my case, it’s a bunch of offending noise induced from the NEC external monitor and the wireless charging stand for my iphone. Both contributed almost equally to the aggregate noise on the radio, which included a huge baseline noise floor including oscillating pulses at times. Not shown in the video is that the noise is even worse when charging a iphone in the stand. The radio is being powered by a battery, so that suggests that the EMI is a radiated noise versus a conducted noise through the cabling. In full disclosure, I had an 20m PAR End Fed antenna antenna strung up within the room and extending into the living room which exacerbated the issue, but it’s a really good demo of the insidious noise that comes from ordinary appliances within the house.
73 Dave W5OC