[time-nuts] Freestanding mast

[Laurence Motteram]

What is the effect of mast movement with wind?  Is there a tradeoff if
the antenna moves around too much?  I expect that there would be some
additional noise on the timing measurements.

Regards,

Laurence Motteram

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Charles P. Steinmetz
Sent: Friday, 3 September 2010 10:46 AM
To: Discussion of precise time and frequency measurement
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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