There's not much in this world that is able to reliably protect a radios
input from a direct lightning hit (maybe a block of copper instead of
the antenna...). But a surge protector (sometimes called EMP protector
or surge arrester) can increase the probability that a nearby lightning
strike won't induce to high a voltage surge on your receivers input.
Since the input itself may have protection diodes the surge arrester has
to eliminate the part of energy, that would blow the diodes.
If you have a look here
http://precision.hubersuhner.com/co-rub/mozilla/products/hs-p-rf/hs-rf-lightning-protectors/hs-p-rf-lp-pg/hs-p-rf-lp-pg-fp.htm
you'll find types, that are able to handle up to 30kA.
If you could get a GPS receiver protector for, say, 15 or 20 Dollars, I
would apply it. It should be designed to particularly protect receivers,
since transmitter protectors have higher ignition voltages.
Cheers
Volker - DF9PL
Am 26.11.2012 19:18, schrieb Mark Spencer:
I don't use one on my gpsdo feed line. The shield of the feed line is
grounded prior to it entering the house and I don't live in a lightning prone
area. The gps antenna I use apparently has diode protection to provide some
immunity to near by lightning strikes. Most of my radio antennas are dc
grounded. I also had a dedicated roof top ground system installed during some
prior home renovations that the coax shields of my roof top antenna(s) are
connected to. This ground system is in turn connected to the electrical
service ground out side of the house. I'm hopeful the roof top ground will be
a more attractive path to ground for lightning than the shields of the feed
lines that run into the house that are connected to gpsdo's and radios that are
in turn grounded via the electrical system in the house.
If I see a surge suppressor for a decent price on eBay I might re consider
getting one, but I'm unsure if it would make much difference in my
circumstances in the event of a direct hit. I'm primarily interested in
protecting the house and it's occupants. The survival of the radios is a
fairly low priority to me.
I hope I never get to find out what happens if my roof top antennas get hit by
lightning.
Regards
Mark Spencer
Sent from my iPad
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