Sherlock Investigates: Noise
A few years ago, some terrible burping power line noise was reported to me. It was interfering with a 2-meter AM net. Yes, there is still AM activity on two. The guys in the city were using Gonset Communicators on 145.550 MHz.
Amplitude modulation communications is really susceptible to power line noise interference. You may have noticed it as you drive under power lines with your AM car radio. When and if AM broadcasters change over to digital modulation, that will no longer be noticed. But the noise can also mask out weak signals even if you are on FM. You just won’t notice it. It
