[time-nuts] Freestanding mast
LMotteram at scientific-devices.com.au
Fri Sep 3 01:08:43 UTC 2010
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.
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.
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