While I was stationed in Guam I had an opportunity to take a sailing trip to
Truk Island. As an experiment I monitored the background noise on various
frequencies as we travelled away from Guam where the power grid is notoriously
noisy. It dropped off significantly on the bands above 10 MHz in the first 50
miles but on the lower bands it was still evident out to nearly a hundred
miles. We had an SGC tuner on the 60 foot mast as an antenna and the whole
pacific ocean as a ground plane.. An additional thing we found was that the
buzz that you get when touching an ungrounded audio input also went away.
Another instance of background noise was noticed at KL7Y's station. It was
about 45 miles as the crow flies from Anchorage. As we turned the beams past
Anchorage we could notice a definite increase in background noise as a loud
hiss. On 40 meters it was several S-units.
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