John,
Remember the "Cone of Silence" in the old TV show Get Smart... There is
a "Cone of Protection" for lightening, although it was not as funny as
the "Cone of Silence" was... See:
https://apps.dtic.mil/sti/tr/pdf/ADP002181.pdf
and
https://duckduckgo.com/?q=lightening+cone+of+protection&atb=v314-1&iax=images&ia=images
If the cruiser was out of that cone, it could easily become a target for
lightening...
Prior to his passing, I knew Leonard Ball, he held the patent on the
LASER lightening rod, which is now used, alas, Leonard never saw the use
of it...
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 5/5/24 08:46, John Canfield wrote:
Some lightning musings....
My K3s network interface board took a surge on the USB part of the board
a few years ago and toasted a diode and maybe a transistor (I forgot),
RS232 was unaffected. Elecraft replaced the board and returned the old
one. One of my to-do list items is to replace those components. My
primary radio is now a TS-890 but the K3s is on duty for JS8Call 7x24
(when no storms are forecast.) Still salivating over a K4 BTW.
As far as lightning, one of my most unusual personal experiences was
when we had a sailboat (40' ketch with the mainmast 50' off the water)
at a typical Florida marina. Next to us was about a 35 or 40 foot
powerboat and next to him was another sailboat. So one would expect the
powerboat is protected by virtue of the two tall lightning 'rods' on
either side of him.
Uh, no. We had a very close lightning strike, none of our electronics
were damaged and the other sailboat was also unaffected. The powerboat's
electronics were toast, all of them. He couldn't believe it nor could
we. We suspect he took an electrical surge via the shore power cord but
that's just a wild guess. We heard of sailboat that took a strike and
the next morning when they started the engine they discovered the
transmission was internally fused together .
John WB5THT EM00ig
K3s, KPA1500, etc.
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