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Old December 19th 05, 11:17 PM posted to rec.radio.amateur.antenna
Reg Edwards
 
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Default Ground Or Not To Ground Receiving Antenna In Storm ?


"Roy Lewallen" wrote
I'd be willing to wager that there are places in Florida which have

more
lightning strikes in a single summer than have occurred at your QTH

(or
mine) in the past 80 years.


=======================================
Roy, your's is a safe bet.

Nevertheless, statistically speaking, the good people of Florida
should be more scared of dying from gunshot wounds. But it doesn't
seem to worry them very much.
----
Reg.


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Old December 20th 05, 12:02 AM posted to rec.radio.amateur.antenna
Roy Lewallen
 
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Default Ground Or Not To Ground Receiving Antenna In Storm ?

This has been an interesting discussion, and prompted me to do a tiny
bit more research.

It seems to me that if there's any nonlinear phenomenon which allows
some pressure waves to travel through air faster than the speed of
sound, surely a nuclear blast would produce enough pressure to excite
it. But it doesn't seem to. From
http://www.globalsecurity.org/wmd/intro/nuke-blast.htm:

"During the time the blast wave is passing through the superheated
atmosphere in the fireball, it travels at supersonic velocities. After
it leaves the vicinity of the fireball, it slows down to the normal
speed of sound in the atmosphere. As long as the blast wave is expanding
radially, its intensity decreases approximately as the square of the
distance. When the expanding blast wave from a nuclear air burst strikes
the surface of the earth, however, it is reflected, and the reflected
wave reinforces and intensifies the primary wave."

Roy Lewallen, W7EL
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Old December 20th 05, 01:52 AM posted to rec.radio.amateur.antenna
Cecil Moore
 
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Default Ground Or Not To Ground Receiving Antenna In Storm ?

Reg Edwards wrote:
Nevertheless, statistically speaking, the good people of Florida
should be more scared of dying from gunshot wounds. But it doesn't
seem to worry them very much.


Now that so many Floridians are packing, it's the criminals who
should be worried.
--
73, Cecil http://www.qsl.net/w5dxp
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