Hi Oddly enough I've actually worked with an EMP simulator. They indeed put out a lot of energy. The lightning hits I've experienced are no where near EMP level events.
Bob On Apr 12, 2012, at 9:07 PM, Chris Albertson wrote: > On Thu, Apr 12, 2012 at 2:21 PM, Bob Camp <li...@rtty.us> wrote: > >> Hi >> >> Do you have a reference for 100' distant strikes routinely destroying >> receivers? >> >> Bob >> >> > > The ARRL's "QST" magazine Aug -> Nov 1986 is very good and many people here > would have access to it. > They talk about EMP from both atomic weapons and lightening. The EMP from > atomic explosions is as you'd yes worse. If can destroy most electronics > up to 450 miles away in the worse cast (an explosion in the ionosphere.) > > Lightening has vary wide band energy in its EMP and the farther you are > away from it the lower the frequency. So a very close strike might have > much energy at UHF a strike 50 feet away might be only up to HF range. So > it couples to different length conductors depending on the distance. My > reference to 100 feet means you'd need some length on the feed line and > data cables. > > There is a good publication from some one at a university in Florida having > to do with electronics on boats. I can't find it now. > > > -----Original Message----- >> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On >> Behalf Of Chris Albertson >> Sent: Thursday, April 12, 2012 3:25 PM >> To: Discussion of precise time and frequency measurement >> Subject: Re: [time-nuts] Best location for a GPS antenna...? >> >> On Thu, Apr 12, 2012 at 11:56 AM, Randy D. Hunt >> <randy_hunt...@yahoo.com>wrote: >> >>> On 4/12/2012 1:10 AM, Heinzmann, Stefan (ALC NetworX GmbH) wrote: >>> >>>> What about mounting the antenna on the side of the metal pole, with the >>>> top of the pole extending a foot or more above the antenna? >>> >>> >> Typically when a receiver or other radio is destroyed it was NOT because of >> a direct strike. A strike within maybe 100 feet is enough. There is a >> _huge_ EMP field around the strike. The field will induce large currents >> in any nearby conductors. Even if the strike is to bare Earth many feet >> from the antenna the potential of the earth is raised by say 1,000 volts so >> now anything connected between ground the power has 1KV across it. >> >> >> >> >> >> Chris Albertson >> Redondo Beach, California >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > > > -- > > Chris Albertson > Redondo Beach, California > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.