[Hallicrafters] Antenna Lightning Protection

[Glen Zook]

If you are thinking of a cone with straight sides then a 45 degree angle is probably a close approximation.  However, at least in my experience, the cone is parabolic in shape and as the sides approach the ground they "fan out" quite a bit.  But, a true cone with a radius equal to the height of the vertical structure is easier to imagine for most.

Yes, I definitely know where Mount Lemmon is!  When I was in elementary and high school my father had a number of relatives who lived in Tucson and we would visit them on occasion.

Glen, K9STH

Website:  http://k9sth.com


--- On Wed, 1/7/09, Bob Macklin <macklinbob at msn.com> wrote:

> From: Bob Macklin <macklinbob at msn.com>
Subject: Re: [Hallicrafters] Antenna Lightning Protection

When I was doing the study for NASA in 83 I was taught that the cone was about 45deg.
 
I know that Glen knows where Mt. Lemmon is. When lightning hits something up there that's not the end of it. There is a lot of granite in that mountain and when it gets to the surface it goes everywhere!
 
We got a lot of experience repairing systems after a hit! We had a powerhouse with 2 naval diesel generators. During the 4 years I was there the powerhouse got hit twice. That's when we started installing the large knife switches to disconnect everything. Then we went to the dorm to hideout!