In Reply to: Contrary to the "miles and miles" canard regarding posted by E-Stat on January 18, 2007 at 11:55:45:
HiOne 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=891Best,
Tom Danley
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: Contrary to the "miles and miles" canard regarding - tomservo 13:51:22 01/18/07 (4)
- Thanks, Tom - E-Stat 13:33:11 01/19/07 (3)
- Unfortunately, ferrites have sonic flavors - Al Sekela 10:42:22 01/20/07 (2)
- Re: Unfortunately, ferrites have sonic flavors - Charles Hansen 10:45:48 01/20/07 (1)
- Thanks, guys - E-Stat 11:52:37 01/20/07 (0)