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Re: [TowerTalk] RE: One Man Tower

To: "Dudley Chapman" <>
Subject: Re: [TowerTalk] RE: One Man Tower
From: Pete Smith <>
Date: Wed, 18 Feb 2004 09:24:13 -0500
List-post: <>
At 09:10 AM 2/18/04 -0500, Dudley Chapman wrote:
After seeing your message I found this.  What do people think about these

I was perplexed by the windload numbers. The site says:

The wind speed ratings given below are from the engineer's certification for the Mark 4 tower design. The report is for the 15-meter (49.7 ft) tower and is expressed in the Load Range Factor Design (LRFD) standards used in the U.S.A. The antenna is assumed to have a surface area of 19 square feet.

Ratings are given for the antenna in its operating position at the top of the tower and for the antenna in its lowest position.

Terrain Category 2 (TC2) refers to open, relatively treeless terrain. Terrain Category 3 (TC3) refers to suburban and forested terrain.

Antenna Up TC2: 103 mph (167kph) TC3: 120 mph (194 kph)

Antenna Lowered TC2: 125 mph (202 kph) TC3: 148 mph (239 kph)

I've never heard of LRFD standards in the ham antenna context (or anywhere else), and wonder how successful you would be in persuading your local building permit office to accept these numbers in lieu of the EIA standard-derived figures for 70mph, 90 mph and so on. Looks like you might be putting yourself in for some extra engineering costs.

No prices on the site either. It would be interesting to see how they compare with conventional crank-ups.

73, Pete N4ZR Check out the World HF Contest Station Database Updated 9 Jan 04


See: for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.

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