[TowerTalk] lightning protection at towers and bunkers on former AT&T microwave relay sites

[Ed Williams]

Hi All,

I would suggest looking at the Motorola R-56 manual (Standards and
Guidelines for Communication Sites). This will provide most any thing you
need to know.

73, de KN4KL ed

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Jim
Brown
Sent: Wednesday, May 17, 2017 7:13 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] lightning protection at towers and bunkers on
former AT&T microwave relay sites

On Wed,5/17/2017 6:52 AM, David J "Dave" Windisch wrote:
> Anybody out there really know in detail the measures AT&T typically 
> took to protect those towers and bunkers on their former microwave 
> relay sites from lightning strikes?

I know a bit having poked around one of them on a 3,000 ft peak in NorCal
that my friend owns. The tower is about 150 ft tall, 32 ft square at the
base, 24 ft square at the top. There were lots of big dishes and hard line
on it, much of it now gone and replaced by cell and 2-way antennas. The
tower is adjacent to a 2-story building that is 120 ft x
60 ft. The facility was built in the mid-'50s.

It's pretty classic grounding and bonding. Earth electrodes by each of the
tower feet, with access provided for maintenance from above. There's a
perimeter ground inside the building, bonded to power entry and the tower
grounds. There's probably more that what I've outlined. I've seen drawings,
but don't recall more details 15 years later.

73, Jim K9YC


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