The Circle of Zap ! - Lightning - How Close Is Close ?

The Circle of Zap ! - Lightning - How Close Is Close ?

Post by RHF » Fri, 24 Aug 2007 15:09:23


The Circle of Zap ! - Lightning - How Close Is Close ?
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/14342
 .
First you and your Family were not Home so no people was Hurt.
 .
Considering a Direct Hit - Lightning Hitting Your House;
-or- Your Antenna Ground System;
-or- Your Car while it was parked inside the Garage.
- - - To Say The Least You Have Been ZAPPED
and the Worst could be that the House and Everything
is a Total Loss. Yes - It was Over before you knew it happen.
 .
Next consider a Near Hit within 300 Yards of Your House. The
EMF was so great it fried many of your household electronic
appliances, Microwave, Toothbrush, Telephones, TVs, PC, and
many of the Light Bulbs were gone too; not to mention the
Washer & Dryer; Refregerator; Hot Water Heater and the AC Unit.
-Now- If before you left the house you disconnected the Antenna
from the Radios; and unplugged the Radios from the AC Power;
Shorted Out the Antenna Inputs of the Radios and put the Radios
in a Strong Metal Box . . . The Good News is that your Radios
are OK - Whoopie ! - Now Explain that to your Wife :o)
 .
Then consider a Not-So-Near-Hit about a Mile Away from Your
House. The EMF was not-so-great; and some items in your
house did get Zaps. The DVD doesn't DVD anymore and the
Fish in the Fish Tank are dead because the Air Pump stopped.
-But Again- The Good News is that your Radios are OK
- Now Explain that to your Kids who want to have a Funeral
for the Fish :-(
 .
Finally consider a distant Hit of Lightning about 3-5 Miles
away, Your House is Safe and you Radios were not harmed.
The Gizmo Box gizzed; The Neon Bulb glowed;
The Diodes dioded; and the Bleed Resister bled.
 .
Most of these things are designed for 'low-level-protection'
and are simply not Lightning Protectors. The do a reasonable
job of getting rid of Static and minor EMF problems from
distant events. But a Very Near of Direct Hit NO [.]
 .
With out going through a lot of work and a lot of money
Protecting your House and your Radios from Lightning is
not easy. However there are somethings that you can do
to Protect your Radios and in the process Protect Your
House and Family.
 .
# 1 - Disconnected the Antennas and feed-in-lines outside
and away from the House when you are not using the Radios;
or when a T&L Storm is in the local area. This should be
a designed-in feature of your Antenna Grounding System.
 .
# 2 - Unplugged the Radios from the AC Power when
not in use or when a T&L Storm is in the local area.
 .
# 3 - Shorted Out the Antenna Inputs of the Radios when
not in use or when a T&L Storm is in the local area.
 .
# 4 - Put the Radios in a Strong Metal Box; this is way
too much; but if it makes you feel good . . .
 .
 .
don't invite lightning into you house - iane ~ RHF
 .
Shortwave Listener (SWL) Antennas Group => http://tinyurl.com/ogvcf
GoTo => http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
The SWL Antenna Discussion Group => http://tinyurl.com/ogvcf
Shortwave Listener (SWL) Antenna HELP => http://tinyurl.com/ogvcf
Shortwave Listener (SWL) Antenna NEWS => http://tinyurl.com/ogvcf
Shortwave Listener (SWL) Antenna INFO => http://tinyurl.com/ogvcf
* * * All Are Welcome : Including ELMERS and 'Want-to-be-Elmers'
plus plain old "Mister-Know-It-Alls"; and even those Newbees with
"I Know This Is A Really Dumb Question - But _ _ _ _ _ _ _ _ "
 .
The Shortwave Listener's Blessing :
SWL BLESSING => http://tinyurl.com/s2bjm
May You Never Tire of Listening to the Radio and Always
have Strong Signals and Noise Free Reception ~ RHF {ibid}
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/9233
 .
Tous Sont Bienvenus ! - - - Groupe par Radio
d'auditeur d'onde courte pour des Antennes de SWL
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
 .
Alle Sind Willkommen ! - - - Shortwave Radiozuh?rer
Gruppe fr SWL Antennen
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
 .
Tutti Sono Benvenuti ! - - - Gruppo Radiofonico
dell'ascoltatore di onda corta per le Antenne di SWL
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
 .
Todos S?o Bem-vindos ! - - - Grupo de Rdio
do ouvinte do Shortwave para Antenas de SWL
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
 .
?Todos Son Agradables! - - - Grupo de Radio del oyente
de la onda corta para las Antenas de SWL
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
 .
= = = = Plain Old American-English Translation = = = =
All are Welcome - - - To Join the Shortwave Listeners
(SWL) Antenna Group on YAHOO !
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
 .
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The Circle of Zap ! - Lightning - How Close Is Close ?

Post by Burr » Fri, 24 Aug 2007 16:02:23



The Circle of Zap ! - Lightning - How Close Is Close ?
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/14342

EMF from a "close" lightning hit/pass got my Linksys WRTP54G wireless router
last week.

Remember the old "box fans", lightning anyplace close (same block) would
burn them out.

Burr

 
 
 

The Circle of Zap ! - Lightning - How Close Is Close ?

Post by RHF » Sat, 25 Aug 2007 01:21:13




> The Circle of Zap ! - Lightning - How Close Is Close ?http://groups.yahoo.com/group/Shortwave-SWL-Antenna/message/14342

> EMF from a "close" lightning hit/pass got my Linksys WRTP54G wireless router
> last week.

> Remember the old "box fans", lightning anyplace close (same block) would
> burn them out.

> Burr

Burr - The old 20" Box Fans were/are one of the most
Efficient Electric Fans around for Power Usage and
the Amount of Air Moved.  Plus their Price usually
makes them the best deal in portable Room Fans. ~ RHF
 .
 .
. .
 
 
 

The Circle of Zap ! - Lightning - How Close Is Close ?

Post by w_to » Sun, 26 Aug 2007 07:14:57


Quote:> EMF from a "close"lightninghit/pass got my Linksys WRTP54G wireless router
> last week.

> Remember the old "box fans",lightninganyplace close (same block) would
> burn them out.

  Some campers were sleeping beneath a tree when lightning struck that
tree.  Those who were sleeping tangent to that tree were unharmed.
Two who were sleeping pointed at that tree required emergency medical
transport being struck directly.  Struck directly?  Lightnng struck
the tree - not campers?

  Lightning that struck a tree only harmed two.  Follow the current.
First, the path is from cloud to earthborne charges maybe miles from
those campers.  The path was down to tree into earth, up campers head,
down and back to earth via feet, and then on to charges.  So yes, only
the two campers who completed the direct electrical circuit suffered a
direct lightning strike.

  That is more likely the reason for router failure.  EMF from
lightning is so small as to be made irrelevant by protection inside
all electronics.

  A direct lightning strike was to the building lightning rod.  That
means the entire lightning strike traveled to earth via a wire outside
the wall.  On the other side of that wall and only four feet away was
a running computer.  Computer did not even crash or reboot.
Destructive EMF fields exist where half facts are posted.  Most damage
from nearby lightning is, in reality, a direct strike to appliances.
What was the current path to and through earth?  Same question
describes why only two campers suffered from a direct lightning
strike.  And suffered massively.

  A long wire antenna sees maybe a few thousand volts due to a nearby
strike.  Then we reduce that thousands of volts to near zero by
connecting that antenna to earth via an NE-2 neon glow lamp.  Notice
how near zero volts is created by conducting only milliamps to earth.
Many will hype the thousands of volts and forget why we make that
induced surge irrelevant with only milliamps through a neon glow
lamp.  As noted above, many will preach the dangers of EMF from nearby
lightning by only discussing the voltage; by ignoring current and by
ignoring how little makes the EMF transient irrelevant.