Reinforcing your first point. It is also worth noting that the sweet spot
for switching regulators is about the same frequency as the AM band. Cars
have had both switching regulators and AM radio for a while now.

On Sun, Oct 16, 2016 at 12:06 AM, Perry Sandeen via time-nuts <
time-nuts@febo.com> wrote:

>
> List,
> 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 electrodes.
> 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.
> Regards,
> Perrier
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