Hi,
I have a personal reference: In the Deep Space tracking facility where
I used to work some 20 years ago it was very common to have
minicomputers damaged by strikes in the antenna. This antenna was
located about 1000' from the control room and there were an elaborate
grounding system both in the antenna (mainly intended to protect from
lightning) and in the control room, but we got TTL chips damaged very
often during thunderstorms. The common believe was the high currents
induced in the ground cabling caused voltage spikes inside the computer
cabinets enough to fry the chips. I don't remember failures in the
receivers, transmitters or other subsystems, but minicomputers were the
usual targets, one or two chips each time.
Regards,
Ignacio, EB4APL
On 12/04/2012 23:21, Bob Camp wrote:
Hi
Do you have a reference for 100' distant strikes routinely destroying
receivers?
Bob
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Chris Albertson
Sent: Thursday, April 12, 2012 3:25 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Best location for a GPS antenna...?
On Thu, Apr 12, 2012 at 11:56 AM, Randy D. Hunt
<[email protected]>wrote:
On 4/12/2012 1:10 AM, Heinzmann, Stefan (ALC NetworX GmbH) wrote:
What about mounting the antenna on the side of the metal pole, with the
top of the pole extending a foot or more above the antenna?
Typically when a receiver or other radio is destroyed it was NOT because of
a direct strike. A strike within maybe 100 feet is enough. There is a
_huge_ EMP field around the strike. The field will induce large currents
in any nearby conductors. Even if the strike is to bare Earth many feet
from the antenna the potential of the earth is raised by say 1,000 volts so
now anything connected between ground the power has 1KV across it.
Chris Albertson
Redondo Beach, California
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