On 10/26/2014 10:25 AM, Jim Lux wrote:
On 10/26/14, 8:53 AM, Vegard Svanberg wrote:
.........Apart from the pole itself, an issue is also proper
anchoring in the
ground (rocky ground is easy, obviously, while sandy and muddy soil
could be tricky).
The weight of the antennas are only about 400 grams and the surface area
is small (HxW = ~300 x ~80 mm) so we're talking pretty light and simple
stuff here.
Before I go ahead and start constructing this myself, I was just
wondering if someone here has done something similar before, or know
someone who sell ready-made kits I can buy.
This sounds a lot like what TV antennas use. Standard inexpensive
steel tubing masts in sections, guying hardware, etc. Your windload is
way lower than a big LPDA for fringe area TV reception.
When I lived in Florida, I had "Wireless Cable" (aka 2.5 to 2.7 GHz
MMDS) for a while. To get LOS to the tower, they put a Rohn push-up mast
on my roof and guyed it to the fascia boards. The antenna was a small
"barbeque grill" parabolic (~16 to 18 inches across, if I recall
correctly). In my case the overall height above ground was somewhere
between 35 and 40 ft.
I actually worked in the MMDS business for a time (on down-converters),
so I know firsthand how much pressure there is to make customer premises
equipment (CPE) as cheap as possible. If you couldn't sell the
downconverter for less than $50, it cost too much. Thus, I imagine that
steel pushup masts were among the cheapest solutions out there at the
time. I don't know, but perhaps composites have come down in price
since then.
73, Mike W4EF...........
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