[opendtv] Re: Louisiana governor blasts faulty wireless networks
- From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 26 Sep 2005 08:23:53 -0400
I merely report what happens in a strong hurricane. The towers blow down.
Their was cellphone failure in New Orleans just as there was here in
Florida. If you had relatives in the areas hot by Katrina or Rita, you
would have run into this.
I did not mean to imply that small towers were any stronger or weaker than
big towers. However, because of the larger area that be served from a high
tower, you are more likely to be able to get signal into a devastated area
from a nearby area that the strongest part of the storm passed by.
When a hurricane hits modern civilization quits for at least a couple weeks.
Al
----- Original Message -----
From: "John Willkie" <JohnWillkie@xxxxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Sunday, September 25, 2005 11:28 PM
Subject: [opendtv] Re: Louisiana governor blasts faulty wireless networks
> Bob (and to a lesser extent) Al;
>
> I strongly suspect that neither of you has ever designed an antenna
system,
> and have no idea of what actually goes into it.
>
> It is PLAINLY WRONG that small towers are more likely to fall than big
> towers. It is equally wrong -- and manifestly uninformed -- to say that
> small towers are more (or less) likely to fail than big towers.
>
> When one designs a tower structure, one first takes in the immediate use,
> and -- since it's much more expensive to build a tower than to add another
> antenna to a properly designed one -- any future or even possible future
> uses. Broadcasters have found that big towers can pay for them selves
> (almost) in some areas if there are enough other users interested in
leasing
> tower space.
>
> Then, after you figure out the maximum top weight, you factor in the
weight
> of the cables and hardware that connect the cables securely to the tower.
> Then, you figure out the cross-sections that the tower presents to the
wind
> from all directions.
>
> In intemperate zones (which rarely have hurricanes), one also adds in the
> maximum accumulation of ice that could be seen on the tower in the
> worst-case situation. If necessary, you redo the weight/wind calculations
> because de-icing equipment adds weight, cables and hardware.
>
> All these calculations -- and the budget, tells you what type of tower
> (self-supportting or guyed) you can erect, and how much it will cost.
>
> Small towers can be made sturdy easier than can large towers.
>
> Note that few to none small cellular towers failed.
>
> What's the difference is that people interested in communicating in
> worst-case situations (broadcasters and cellular companies qualify) build
> their towers according to that need. If you are a small-time chump who
> lives off the last politician's bung-hole that you licked, who needs to
> worry about engineering concens -- it's not like anybody's life depended
on
> your political hack work.
>
> I could go on about tower construction -- angular momentum, guying
patterns,
> etc., but I'm only an expert on this subject in comparison to other
> "commenters."
>
> John Willkie
>
> ----- Original Message -----
> From: "Bob Miller" <bob@xxxxxxxxxx>
> To: <opendtv@xxxxxxxxxxxxx>
> Sent: Tuesday, September 13, 2005 10:58 AM
> Subject: [opendtv] Re: Louisiana governor blasts faulty wireless networks
>
>
> > Cop radios failed because small towers didn't survive. OK but that does
> > not translate to small towers are just as vulnerable as 1000 footers.
> >
> > If you wanted to build a system that would survive hurricanes small
> > towers with solid state transmitters could be built.
> >
> > Or we could use flying balloons at 65,000 ft. I doubt if they would be
> > affected at all by hurricanes.
> >
> > http://www.sanswire.com/stratellites.htm
> >
> > Bob Miller
> >
> > Allen Le Roy Limberg wrote:
> >
> > >Small towers don't survive hurricane winds. Why do you think cop radio
> > >fails?
> > >
> > >Al Limberg
> > >
> > >----- Original Message -----
> > >From: "Craig Birkmaier" <craig@xxxxxxxxx>
> > >To: <opendtv@xxxxxxxxxxxxx>
> > >Sent: Monday, September 12, 2005 9:50 AM
> > >Subject: [opendtv] Re: Louisiana governor blasts faulty wireless
networks
> > >
> > >
> > >
> > >
> > >>At 4:20 PM -0700 9/10/05, John Willkie wrote:
> > >>
> > >>
> > >>>WWL said last week they had enough fuel at their transmitter site to
> last
> > >>>for another month or so. That would be about two days of power for a
> > >>>
> > >>>
> > >COFDM
> > >
> > >
> > >>>transmitter of equal power.
> > >>>
> > >>>
> > >>>
> > >>Fortunately, a network of COFDM cells could do the job with about
> > >>1/10th the power, relative to one big 8-VSB stick.
> > >>
> > >>Regards
> > >>Craig
> > >>
> > >>
> > >>
> >
> >
> >
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>
>
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