[time-nuts] Freestanding mast

Stanley Reynolds stanley_reynolds at yahoo.com
Fri Sep 3 01:16:38 UTC 2010


ROHN 9H50 34 Foot Telescopic TV Wireless Antenna Push Up Mast

http://www.3starinc.com/rohn_telescopic_masts.html

I don't know this vendor just the first that came up in google.

Stanley


 


----- Original Message ----
From: Charles P. Steinmetz <charles_steinmetz at lavabit.com>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Thu, September 2, 2010 7:46:00 PM
Subject: [time-nuts] Freestanding mast

I'm curious what the best freestanding mast is for a timing antenna (think 
Lucent timing antenna or marine "mushroom" GPS antenna -- light and pretty 
small).  The mast would have its highest support at rooftop or chimney-top 
level, and could extend from there as far downward as the ground with additional 
supports as required.  Should be able to survive at least Category 2 winds and 
heavy snow and ice.

What reasonably available mast material no more than, say, 3" in maximum 
cross-section would allow the most vertical extension above the highest support, 
and how much extension would that be?  I'm thinking 10 feet of 2" or so 
thin-wall steel tube may be OK, but beyond that I don't know.  Tubing is 
probably not the optimum shape, but I assume the availability of other 
engineering shapes (say, "+" cross-section) is likely to be limited.

Ideas?

Thanks,

Charles




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