[TowerTalk] Fwd: Near Field Lightning Damage

[Patrick Greenlee]

No crew casualties were reported.

  Sorry for your lightning induced damage.

One of the most common ways to sustain injury from lightning is to be 
standing on your own two feet, squating or otherwise, when a bolt hits 
the ground nearby.  Your feet act like the wipers of a potentiometer and 
a percentage of the voltage of the discharge is felt as a voltage 
difference from one foot to the other with current flowing from one foot 
to the other via your legs and lower abdomen. Not a good thing.)

Sounds like a joke but isn't.  For protection from lightning damage as 
described above you stand on one leg or with one foot atop the other.

Patrick    NJ5G

On 4/19/2015 7:31 PM, Mickey Baker wrote:
> ​N2JFS>> ​"
> I believe a EMP strong enough to take out a watch also will take out the
> person carrying that watch.
> ​"
>
> I sustained a serious injury in 2000 when lightning hit a tree about 10'
> away from where I had squatted. My gastrocnemius sustained damage which
> resulted in compartment syndrome, a trip to the emergency room and a 4
> compartment fasciotomy. It was a big deal to me, but a common lightning
> injury. No direct hit, but indirect serious injury.
>
> ​This is typical of injury caused by near field induced current by
> lightning.
>
> Be careful out there!
>
> Mickey N4MB​
>
>
>
>
>
> On Sun, Apr 19, 2015 at 3:44 PM, Hans Hammarquist via TowerTalk <
> towertalk at contesting.com> wrote:
>
>> This sounds very anecdotal. Yes, a near strike lightning may take out CB
>> radios etc but that it took out digital watches make me suspicious. The are
>> usually metal encapsulated and very immune to external field. I believe a
>> EMP strong enough to take out a watch also will take out the person
>> carrying that watch.
>>
>>
>> Depending on the grid size, a Faraday cage is useful for the EM from a
>> lightning as the "M" will introduce back EMF in the cage which will
>> neutralize the "M".
>>
>>
>> I hope the "falme" will not be too long,
>>
>>
>> Hans - N2JFS
>>
>>
>>
>> -----Original Message-----
>> From: Patrick Greenlee <patrick_g at windstream.net>
>> To: towertalk <towertalk at contesting.com>
>> Sent: Sat, Apr 18, 2015 10:18 pm
>> Subject: Re: [TowerTalk] Near Field Lightning Damage
>>
>>
>> Back in the 80's a tuna boat pulled into San Diego with every device on
>> board
>> containing a semi-conductor inoperative.  CB radio, Marine VHF,
>> SSB, SONAR,
>> RADAR, VHS tape player, SatNav LORAN, and on and on...  All
>> the crew members
>> wore digital watches which were all totally dead.
>>
>> One near miss by a large
>> lightning stroke took out everything with solid
>> state semiconductor junctions.
>> The good news was they didn't have a
>> spotter chopper aloft at the time
>> dependent on the aircraft beacon band
>> transmitter on board to find the boat
>> (helipad is the roof of the pilot
>> house.)  We theorized it was the EMP that
>> ate everything as there was no
>> evidence that the bolt hit the boat.
>>
>> Later
>> when asked what could be done to provide an immune backup comm
>> radio we told
>> them a mu metal box.  A Faraday cage wouldn't stop the
>> magnetic pulse.
>>
>> Just
>> a thought in case there are any serious preppers in our midst.
>>
>> Patrick
>> NJ5G
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