Hi Some of the people posting to the thread seem to be concerned about the house burning down because they put up a GPS antenna...
Receivers can die from a lot of causes. A TBolt like GPS being killed by input overload from a strike 100 feet away would not be very high on my list of likely problems. Bob -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Albertson Sent: Thursday, April 12, 2012 12:50 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Best location for a GPS antenna...? On Wed, Apr 11, 2012 at 3:08 PM, Bob Camp <li...@rtty.us> wrote: > Hi > > If the antenna is no higher than your house, it's no more likely to get hit than the house. > If it's higher than the house by a few feet, the increase in hit probability is vanishingly small. Antenna do not have to be directly hit to destroy the receiver. Let's say that something 100 feet away is hit. The nearby strike is thousands of amps of current in a brief pulse. What you have is a strong electromagnetic field pulse. This will induce current in any nearby conductor, including your antenna mast, power lines, phone lines and even the copper traces on a PCB. The effects vary based on the geometry. One does not even worry about a direct hit. It is rare and if it happens your equipment is vaporized. But near hits happen all the time you can expect them and they are mostly the cause of damaged equipment and it is actually posable to protect against a nearby hit. Think of lightening like a 1,000 pound bomb. If one falls from the sky on a city and hits you on the head you are dead. But most of the people effected by the bomb did NOT get hit on the head and were varying distances from it and for most of them various protection measures can be very effective. Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.