[time-nuts] Freestanding mast

Stan, W1LE stanw1le at verizon.net
Fri Sep 3 01:40:14 UTC 2010

  Hello Charles,

Last September I had some roof work done and I had added 2 each 1-1/2" 
vent pipe penetrations just below the ridge.
Now I have a place to add the GPS antenna, either  a hockey puck type or 
a more sophisticated one.
The hockey puck was added to a length of PVC conduit to penetrate the gland
The GPS antenna is just level with the roof ridge, for no blockage.

Previously I used a MS-44 aluminum military masting tripod tower to put 
the GPS antenna just above the gutter height ~ 11' high.

The rest of your questions I would have to find a PE.

Stan,  W1LE

On 9/2/2010 8:46 PM, Charles P. Steinmetz wrote:
> 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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