Yes, you make a good point. Electromagnetic fields are another source of ingress, whether from a nearby cell phone or by being located a mile away from a 50 KW AM radio transmitter (etc.).
>one does wonder why there's such inadequate shielding As a ham radio operator, I can say that has been a question raised about consumer electronics in general for many decades, particularly since the advent of solid state devices with their low voltage diode detecting capability. The answer, unfortunately, is simple--economics. If only 1 out of 1000 devices is exposed to a situation that results in interference, the manufacture is loathe to spend even a nickel to protect against it--especially if the volume is large. Five cents on 1,000,000 products is $50,000. Depending on the strength of the interfering signal, it can take a lot more than five cents to protect it. Cell phones aren't very high power, The 50 KW transmitter--well that's another story. Wilton
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