Two Points
1. Switching regulator power supplies are here to stay and will replace most 
transformer types as the are cheaper, smaller, and more energy efficient. They 
have improved to the point of being used in medical equipment for patient 
monitoring equipment that picks up milli-volt signals from the patient 
2. It is very simple to use a cheap all band AM-FM shortwave receiver with an 
isolation cap to the antenna. Cheap, quick, and efficient.  BTDTGTTS.  What one 
is interested in usually is that there is interference, not its exact level or 
wave form.
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