[time-nuts] Installing GPS Antenna

[Chris Albertson]

Copper?  What an expensive material to use.   Galvanized iron pipe is
cheaper and very strong.   But even the thinner "type M" copper pipe
is strong enough if it is 1 1/4" diameter.

You should not need guy wires on such a short mast.   You will need
likely the proper threaded adaptor to fit the antenna mount.   Run the
coax antenna lead down the center of the pipe.  Also be sure and
ground the pipe to a ground rod.   The ground wire needs to be (from
memory) #8 or larger.   You don't want a 20 foot tall ungrounded
lightening rod up on the roof.  Electric code requires the ground.

One thing, because you used copper pipe use either copper wire for the
ground or if using aluminum wire use the special fittings/clamps
designed for connecting aluminum to copper.

I assume this is an unused chimney?

On Fri, Feb 17, 2017 at 9:57 PM,  <timenut at metachaos.net> wrote:
> I have finally ordered a GPSDO (probably get here in April). In the meantime,
> I have the GPS antenna (Luctel, 26Db). I picked up a 20' solid section of 1 1/4"
> copper pipe at the plumbing store with the intention of mounting it to my
> chimney.
>
> My question is about the stability of that mounting. I expect that 16 or 17
> feet of the pipe will be above the chimney. The weight of the GPS antenna is
> trivial. The effective cross section area of the pipe is very small as well,
> so I would think that wind effects would be pretty small even for a good
> breeze.
>
> Will that be sufficiently stable, or will I need to include guy wires? If so,
> are there any recommendations in that area. I don't really have any experience
> putting up antennas. I know that TV antennas are much heavier and, even though
> not mounted as high, still 10' or so is common without guy wires.
>
> Thanks.
>
> Michael
>
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-- 

Chris Albertson
Redondo Beach, California