[time-nuts] GPS antenna and lightning
rvassar at rob-vassar.com
Sat Sep 26 12:44:52 UTC 2009
We get a fair bit of lightning here in Texas. I'm a transplant from
nearly lightning free California, so I had to go thru an expensive
period of education. A couple quick thoughts:
Nothing will save you from a direct strike. At least nothing you can
likely afford. You're more likely to get clobbered by a surge from
the grid, or induced voltage from a nearby strike.
Use the "box method". Draw a diagram of your equipment, then draw a
large box around it. Any wire that enters or leaves the box requires
some kind of protection device. In the case of a GPS antenna, likely
a relatively expensive gas discharge tube bonded to a properly
installed ground rod by a short length of heavy copper braid.
That said, I still can't bring myself to leave my HF radio gear
connected to an antenna all the time. I unplug mine when not in use
and place the lead in a stoneware jar on the floor of my garage.
On Sep 26, 2009, at 4:37 AM, Jim Palfreyman wrote:
> Hi All,
> I live in Hobart, Tasmania which has low level of thunderstorms -
> average 2 thunder-days a year. However recently we've had a few and
> I've begun to think about my GPS antenna on the roof on top of my TV
> A bolt on that could take out not only my plasma tv but potentially an
> awful lot of time equipment that is precious to me.
> For those of you in lightning prone areas, what precautions have
> you taken?
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