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[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Peter Lambert
Sent: Tuesday, November 07, 2017 5:57 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Lightening damage
Likewise - 3 direct hits to the tower and nothing in the house damaged.
Radios always plugged in.
Do it
-boun...@mailman.qth.net] On Behalf Of j...@kk9a.com
Sent: Wednesday, 8 November 2017 8:12 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Lightening damage
Bingo!
Of course the tower is not immune from lightning. Mine has taken many direct
strikes and it has a number of ground rods. The g
Bingo!
Of course the tower is not immune from lightning. Mine has taken many direct
strikes and it has a number of ground rods. The ground system gives it a
path that is not though your equipment. Also a single point ground and
proper bonding as K9YC mentioned will keep everything at the same poten
Are you sure that they are not being hit, but are so well bonded that the
strike goes directly to ground?
Sent from my iPhone
...nr4c. bill
> On Nov 7, 2017, at 11:58 AM, wrote:
>
> Why would lightning avoid striking a grounded tower?
>
> John KK9A
>
> Richard Fjeld rpfjeld at outlook.com
Why would lightning avoid striking a grounded tower?
John KK9A
Depleted ground charge.
THE reason for lightning rods.
Chas
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I supported myself at university as an engineer at the only TV station
in town. Transmitters [10 KW visual, 5 KW aural] and studio were in a
building at the base of a 400' tower on a ridge overlooking town.
Studio wiring was in trenches in the concrete floor covered with fairly
heavy steel pl
On 11/7/2017 9:31 AM, Gmail - George wrote:
Any electronics at the top that is connected at the bottom
can have that potential on the equipment case (a DC ground loop so to
speak) of 100 volts. Most times it is much higher.
It is a serious mistake to view lightning as DC. While there MAY be a
rge builds up too
quickly for it to bleed off harmlessly.
73, Ron AC7AC
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of j...@kk9a.com
Sent: Tuesday, November 7, 2017 8:59 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft]
Rich,
Even massive grounding systems do not keep a tower from being hit! It only
mitigates the damage.
I was CE of a TV station in South Florida with towers of 1,000' a couple at
500' and several more at 100' to 200'. They all got hit at one time or
other. Sometimes many times a year.
We used m
> Certain radio and TV services need to operate 24/7 and can't shut down when
> lightening threatens. Their grounding methods apparently prevent the towers
> from being hit .
My experience as a 1st Phone running AM broadcast stations is that the
towers _are_ hit by lightning. This was in the earl
Why would lightning avoid striking a grounded tower?
John KK9A
Richard Fjeld rpfjeld at outlook.com
I'm trying to avoid taking anyone's side on this discussion. I wanted to
say that I worked for a company that had towers throughout the state which
were several hundred feet tall. Over the yea
ail
> Sent: Monday, November 6, 2017 6:12 PM
> To: Elecraft@mailman.qth.net
> Subject: [Elecraft] Lightening damage
>
> I’m sure there are others with more expertise on this subject then me,
> however several texts including the new ARRL grounding book say it may be
> dange
I had a direct lightning strike this summer in July. It has also caused
fire that created more damage then lightning itself. The interesting
thing is that lightning hit not the 20 m tall grounded telescopic mast
that had no antenna (it was down for service), but rather metal roof of
a shed that
from being hit .
Rich, n0ce
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Gmail
Sent: Monday, November 6, 2017 6:12 PM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] Lightening damage
I’m sure there are others with mo
I agree that disconnecting the coax from the antenna inside the house is
a bad idea. All my cables from antennas are permanently connected to a
well-grounded and bonded panel in the shack. I disconnect the coax and
control cables from that panel to the radio. Now, if the tower takes a
direct
Nearly every direct strike will fry something (or manythings), connected
or not. An arc that could involve a kilometer or two probably isn't
going to be deterred by a meter or so of disconnected coax. The
grandson of my Elmer in the early 50's [who now holds his Grandpa's
call] became a light
I’m sure there are others with more expertise on this subject then me, however
several texts including the new ARRL grounding book say it may be dangerous to
disconnect antenna coax in the house. It should only be done outside.
My daughters vertical was hit by lightening and the lightening leap
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