Re: How effective is an earth for reducing noise on AM?
For reception of stronger local stations, I have frequently used a simple wire loop around the window, room or outside. One end in the aerial socket and one (via a 1kV 0.01 uF cap - to be on the safe side) to the earth socket.
It doesn't need to be huge. Five or ten feet per side might be good enough, but if you can string it about outside for a much bigger loop, give it a try.
It probably hopelessly mismatches the aerial input circuits, but it can greatly reduce noise, at the expense of also reducing the wanted signals. But the point being the noise is reduced MUCH more than than stations - in my experience at many locations anyway
Ian.
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