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Old November 30th 08, 04:15 PM posted to rec.radio.amateur.antenna
ml ml is offline
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Posts: 225
Default Lightning Info?

hi

I wondered what would happen if lightning hit my station.
Realize that it's impossible to say exactly but in general i wonder
what the 'step' of failure would be ...

My set up is fairly simple:

I have a few J poles (stainless rods)
some dipoles around 80f some are 10ga some 14
a gps antenna
a fiberglass 900mhz and 1.2g

a 2m and 440 sat eggbeater

most are connected via lmr 400 some lmr600

preamps on the sat are cat 5 fed
one dipole has a sgc tuner fed also via cat5

straight run from roof down a concreate 2x3ft 'shaft' opens on
roof down to elec closet on my floor then into my apt

I have ICE lightning protectors (14story building i am on 4thfl)
almost near where coax enters my apt

they are 'grounded' to the elec ground which I tested and is good as
elec grounds go


typically when weather is bad i unscrew the coax going to the radios
at the ice and leave dangling this creates about a 2ft 'gap'


so assuming a worst case and my roof antennas take a direct hit

what would i theorize would happen?

I suspect the 14g dipole wire would vaporize perhaps also the 10ga

perhaps the jpole might remain?

i suspect the egg beaters would partially vaporize and their baluns
melt

the sgc would fail,

would the coax vaporize at the roof?

would i suspect (distance from roof to ICE @ apt 175ft of coax
) the coax would carry much power measured at my apt end? or
would it vaporize first??

if not would it be absorbed by the concreate walls given the
distance? /arc? by the time it got to my apt?

assuming there would be power down to the ice and given it's
connected to elec ground would anyone suspect they would
dissipate the power to gnd? or just arc over the apt?


any general thoughts as to what might actually happen in this
scenario from both a practical and theoritical would be
appreciated

i always wonder what would be logical to assume in a direct hit
scenario


thanks
 
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