Noise Problems for Broadcast and MF/HF Receivers

摘要

EMI can present itself in many different ways, and can cause an Amateur Radio operator days, weeks or months of untold frustration resolving such matters. I am not immune to this problem. With the temperatures turning colder, sunlight disappearing and fall and winter fast approaching I was presented with an "all bands" EMI issue. After recently moving to a new home, I found myself plagued by a constant 40 to 60 dB of hash every 20 kHz, which extended from 160 through 80 meters and continued with a bit less intensity on all the frequencies higher than 3.5 MHz.