Not often (enough) does a ham have a 100'+ tower either. 😉
THE standard (of way so many to choose from) is from the cell phone
industry (Motorola mostly). It's insanely complex but if you're on a
mountain top and need 100% reliability; ideal. The costs, will be a
second mortgage so some compromises will have to happen.
Here is a better link to the current (newest edition) of the ARRL book;
at least a good starting point for a baseline understanding. Direct
hits, no matter what system/s used, will always show what you missed or
didn't do enough to mitigate.
https://a.co/d/01vRC1W
Another aspect is static reduction. That comes from wind, rain, dust,
snow, anything that passes by the structure. Shunt all to ground
OUTside the building is the best approach. (Base of the tower/mast and
again at structure entry; make EVERYTHING at the same ground potential,
inside and out. When you take a hit, that potential rises, equally if
all is done well; it's the difference in potential that harms.)
73,
Rick nk7i
On 7/28/2023 2:31 PM, Dr. William J. Schmidt wrote:
Even the methods in that book are considered sub-standard by the broadcast
industry... The only think that is a sure bet is to completely disconnect your
radio and put it back in the shipping box.
Dr. William J. Schmidt - K9HZ J68HZ
email: b...@wjschmidt.com
-----Original Message-----
From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net>
Sent: Friday, July 28, 2023 4:14 PM
To: j...@kk9a.com
Cc: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] [OT] A dumb question about lightning
https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwiOk5PAqLKAAxUjEa0GHYmDBJgYABACGgJwdg&ae=2&ohost=www.google.com&cid=CAASJORo_AZEAzrEwZh7d0CRaunieFV8dsSC3IDZqsPWbucgX_uNKQ&sig=AOD64_1qxgTjvgwY4_QbQuPW5KxSnoObmA&q&adurl&ved=2ahUKEwiEsI3AqLKAAxViAjQIHe9mC-UQ0Qx6BAgOEAE
Welcome to the Bible of grounding. It’ll take several reads to grasp what you
have to do.
73,
Rick NK7I
On Jul 28, 2023, at 2:11 PM, j...@kk9a.com wrote:
I would recommend that you follow proper lightning bonding/grounding
techniques, these are the only methods that work. My tower has taken a
number of lighting strikes. You cannot prevent a lightning strike.
Simply disconnecting your feedling will not prevent damage inside your
house as the voltage from a strike will be induced into your home's electrical
wires.
John KK9A
Al Lorona W6LX wrote:
Please don't laugh at me; I'm a transplant from a region of the
country with essentially no lightning to a region where you have to
worry about it quite a bit.
We had a doozy of a storm last night, with lots of lightning overhead.
I felt like a sitting duck, even though I had grounded both sides of
the balanced feedline of the antenna, switched the antenna switch to
the middle
(grounded) position, and even disconnected the coax leading to the
K3's rear-panel antenna port.
Whenever lightning happens, I always wonder if it really is in fact
better to ground everything. Because, doesn't that essentially make a
lightning rod of the antenna? If I simply disconnected the antenna and
left it floating, wouldn't it be less likely to attract a lightning bolt?
I'm of the belief that it's better to try to avoid a direct hit than
to attract one and trust your grounding system to do its thing. I'm of
the belief that no grounding system is perfectly effective.
Al W6LX/4
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