At 11:25 AM 7/5/2007 -0600, you wrote: >Joe Miller, AB8YP wrote: > > > Question: if the limit is 100 microvolts/meter at a > > distance of 30 meters, using the inverse square law, > > would that be roughly the same as 3 watts at the > > antenna? > > >Field strength measured in V/m vs. distance from the radiator is a >straight inverse, rather than an inverse square, isn't it?
>I'm probably wrong, so maybe somebody who knows could explain field >strength measurements.... Mike Los Alamos Almost, Been downloading Part 73 of FCC R&Rs in PDF format. Lot to download, and I do a couple/three chapters a day. I'll get to the field intensity/vs/distance/vs/ground conductivity someday and make sure I know what I'm talking about. Anyway, I'm fairly certain that the function is basically an INVERSE one, and NOT an inverse-squared function, and the FCC charts show an equation with 4/3 constant for the earth's diameter because ground- waves are "pulled" downward by imperfect conductivity. That means the field intensity at some distant point is actually higher than one would expect, because of the 4/3 constant. >Watts per square meter seems more intuitive to me, but that's not what >the FCC calls for. That part is right, and that's why a station has to quadruple power to double coverage. >-- >Mesa Mike, N6KUY, WDX6O >Los Alamos, New Mexico (DM65uv) Perfesser Chuck Quiz tomorrow at 0800! Charles A Taylor, WD4INP Greenville, North Carolina _______________________________________________ IRCA mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: [email protected]
