[TowerTalk] Fwd: Near Field Lightning Damage

[Bill Aycock]

Patrick-
I apologize; from your earlier post, it was not clear that you were directly 
involved, hence my skepticism.
Bill--W4BSG

-----Original Message----- 
From: Patrick Greenlee
Sent: Sunday, April 19, 2015 9:15 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Fwd: Near Field Lightning Damage

Bill, in so doing you would be just as wrong as Hans.  Re the CB
comment.  To my knowledge we never replaced a CB for lighting causes.

Patrick   NJ5G

On 4/19/2015 7:33 PM, Bill Aycock wrote:
> Hans is right, if a little too gentle. I would have called the tale
> "manufactured" on "Invented" rather than "Anecdotal".
> Bill--W4BSG
>
> -----Original Message----- From: Hans Hammarquist via TowerTalk
> Sent: Sunday, April 19, 2015 2:44 PM
> To: towertalk at contesting.com
> Subject: [TowerTalk] Fwd: Near Field Lightning Damage
>
> 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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