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How can HF radio signals travel across the world?

hf radio signals Travel world
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How can HF radio signals travel across the world?

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Long distance HF propagation occurs by radio signals bouncing between the earth and the ionosphere, often several times. This has two consequences with regards to BPL. A lot of long distance wireless HF communications occurs just above the noise floor (the common noise you hear on your radio when you are not receiving a station which is noise leftover from the Big Bang and from various man made sources), receiving very weak signals. A station attempting to receive an HF signal could experience interference from a local BPL system, even if it is notched in the amateur radio bands and 40 or 50 dB below the emissions limit. (A good analogy is it’s hard to hear someone yelling a half mile away when someone is wispering in your ears). The second issue has yet to be proven either way, but with thousands or millions of BPL devices in operation, the noise from these devices combine could raise the noise floor in the HF spectrum and propagate thousands of miles.

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