[time-nuts] GPS antenna selection — lightning

Bob Camp kb8tq at n1k.org
Fri Aug 5 22:21:24 EDT 2016


Ummm ….. It’s a *lot* more fun to focus on the 0.001% case :)


> On Aug 5, 2016, at 9:31 PM, Chris Albertson <albertson.chris at gmail.com> wrote:
> You guys, well some of you are mixing to things
> 1) the building code requirement to ground an antenna is for the protection
> of the building.  The building code don't care if you electronics is fried
> or not.   The wire and ground rod keep the antenna mast at earth potential.
> 2) Those surge protectors and grounding your electronics to a common point
> an al other advice then grounding the most to a rod by the nearest route
> down the side of the house.  These are different things
> So, outdoor antenna are different from indoor antenna in that if you indoor
> antenna is struck the house is already pretty much toasted.   You still
> might want a surge protector to protect the receiver.
> The question is if you need to buy a $40 surge protector for your $8
> Motorola Encore receiver?  But no question if you need a group wire in the
> mast, even for that $8 gps receiver because that wire protects the house
> Part of the equation is where you live.  In many years of living in Redondo
> Beach, CA I never hear of anyone or anything being =damaged by lightening.
> We don't even get lighting here but twice a year if that.   On the other
> hand I had god protection on my sailboat as that 60 for aluminum mast might
> be the highest thing around on the ocean for miles.  That mast has a very
> solid connection straight to saltwater.  You have to evaluate the risk and
> consequence.  You get different answer in Orlando Florida then I get here.
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