I recently noticed unfamiliar source of RFI at my station. The noise is most evident on 20m between 14.190-14.204 mhz.
The sound generated by the RFI is ordinary/constant electrical static. I have taken the following steps: at the main circuit breaker panel, all power circuits were switched OFF. Next, I turned on the AC circuit powering my current radio, IC-7300. All other electrical circuits throughout the house were still powered OFF. The RFI is still present when using only the single electrical circuit.
I initially discovered the RFI while using a 9 month old switching power supply, but the RFI still is present when the radio is powered from an Astron (linear) power supply. I have Fios internet service at my qth: the RFI does not go away when the Fios ONT panel AC and battery backup power are powered off. Another possible culprit was the outdoor street lamp located roughly 50’ from the radio. I stood directly under the lamp holding a portable radio, tuned the radio to an used frequency: no noise/no RFI was detected from the street lamp. Below image shows the radio tuned to 14.197 mhz and the visual pattern associated with the RFI. I have one of the new 6400 series radios on order scheduled to arrive over next couple of weeks and would like to resolve this issue before the new radio arrives. Thanks in advance for related thoughts!