Thank you sharing that information, Dave. I am curious what rotator you
are using at your QTH? We are contemplating some sort of 10 to 30 MHz
log periodic (like the InnovAntennas DELPA-13 or the M2 10-30LP8)
mounted on the same mast below the OB2-40M, so we need to make sure we
select a rotator that is up to the task.
73, Mike W4EF............
On 5/20/2021 1:25 AM, David Gilbert wrote:
I have owned an OB2-40 (the non-Moxon version) for ten years and it
has held up just fine to ridiculous wind gusts on my southern Arizona
hillside. The antenna is built like the proverbial tank and I've
measured wind gusts as high as 100 MPH. The wind gusts are brutal
here for about three months every spring, to the point that I usually
can't bring myself to even look at my antennas when I hear one of
those mini-tornadoes come roaring down the side of the mountain. I
even watched one lift my teenage son about two feet off the ground
while he was weedwacking part of the lot. It picked him up vertically
(with the weedwhacker still in his hands), moved him about three feet
laterally, and set him back down. This is no exaggeration ... I saw
it with my own eyes.
The OB2-40M is listed as having the same overall weight as my OB2-40
and the construction looks identical, except of course for the Moxon
wingtips. The wind area of the OB2-40m is 5.9 sq ft versus 6.8 sq ft
for the OB2-40 and I would think that the Moxon configuration adds a
bit of additional stability, so I don't see why it wouldn't hold up as
well or better than my antenna.
73,
Dave AB7E
On Wed, May 19, 2021 at 7:34 PM Michael Tope <W4EF@dellroy.com> wrote:
One of the radio clubs I belong to is interested in buying an OptiBeam
OB2-40M two-element 40 meter Moxon Yagi. Optibeam is kind of vague on
wind survival specifications. Their website indicates "Windload at 130
km/h 430 N / 0,54 m² / 5,9 feet²". To me that implies the
antenna is designed to survive 130 km/h winds (80.7 MPH), but it
doesn't
actually say that. The antenna is going to be installed at a Southern
California QTH at a fairly low elevation, so icing is extremely
unlikely. However, the antenna will be installed on a high narrow ridge
that lend itself to very high uneven (shearing) winds when we get the
occasional winter storm or Santa Ana wind condition.
Anyone out there using one of these antennas? I am curious what you
think of it in terms of performance and reliability?
Thanks and 73,
Mike W4EF.................
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