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Re: Contrary to the "miles and miles" canard regarding

Hi

One might think that, what has happened is that there are vastly more low power devices which radiate above 900MHz (Cell phones, wireless links like Blue tooth etc) than ever before.

Below that, the average noise level has fallen as they eliminated spark gap florescent starters, industrial equipment having mercury rectifiers, renegade CB stations and such.
Until the governments HAARP program began (which can be a bummer for short wave listeners) the range from the 10 meter band down was much quieter.
AM stations all meet spurious radiation limits now and such as well.

So, the situation is one where the number of weak, high frequency sources is vastly greater while the average RF background level noise is lower than it used to be.
The up side of localized hf noise like this is that a ferrite core around the cable decouples the noise.
When in doubt, these cores are cheap and many clamp around an existing cable.

http://dkc3.digikey.com/PDF/T071/1239.pdf


http://www.skycraftsurplus.com/index.asp?PageAction=VIEWPROD&ProdID=891

Best,

Tom Danley


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