On Sat,7/23/2016 8:42 AM, Terry Brown wrote: > It occurs at any one point in time at 14.030, 14.060, 14.090 for instance, and occurs on all ham bands with the same spacing between the instances of interference. It's a switch-mode power supply, one of the most common noise sources. http://k9yc.com/KillingReceiveNoise.pdf 73, Jim K9YC