I had to replace the front end protection diodes in a cb once. I started
hearing this tick-tick-tick sound from the radio, the receiver went dead, then
there was a lightning flash a mile or two away. then it started ticking again
until the next flash. I pulled the antenna line off the radio and it was
arcing across inside the pl-259. this was out on a high dry plane out west, I
don't think the storm ever got rain to the ground but it sure made an
impressive lightning show.
Apr 19, 2015 10:15:54 PM, patrick_g@windstream.net wrote:
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@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
> To: towertalk
> 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
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk
> mailing
> list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> http://www.avast.com
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|