[Amps] 20kw Dummy load?

[Tony King]

The picture you're looking for is located here:
<http://www.bext.com/_CGC/pictures/celltowerfire.jpg>

and a copy of it on my web page here:
<http://w4zt.com/images/celltowerfire.jpg>

It was reportedly caused by oxy-fuel cutting at the base of the tower. I 
don't have any other details.

73, Tony W4ZT

At 09:03 PM 9/22/2004, Harold B. Mandel wrote:
>Dear Robin,
>
>I sure wish I kept a copy of the photo that was circulating around
>Bechtel this past winter showing the result of a coax fire that started
>at the base of a monopole and flared out through the coax ports
>at the top. It looked like something you see in oil refineries....
>
>Since we were putting in Multi-Carrier Power Amplifiers all over the
>place,
>and since there was a typo in the original SOW that specified "10KW
>output power,"
>I approached my boss and asked if one of the contractors turned the
>output
>adjustment screw past 8'oclock, and he turned white as a sheet........
>
>(The kludges being deployed would go into alarm at 200 watts, but
>   what do managers know, they're only there for the tee shirt.)
>
>Hal Mandel
>W4HBM
>
>
>
>
>On Wed, 22 Sep 2004 23:53:27 +0100 Robin Szemeti <robin at redpoint.org.uk>
>writes:
> > On Saturday 14 August 2004 17:01, Dr. David Kirkby wrote:
> >
> > > Do you have access to a large drum of coax, just capable of taking
> > the
> > > power? Then a long length of it would become lossy and so
> > dissipate
> > > the heat along its length. If you unwound it, it will do it. Don't
> > > leave it wound up, as it will obviously overheat.
> > >
> > > I used to use a 500' real of RG/58 coax as my dummy load on 2m
> > with a
> > > pair of 4CX250Bs. That could melt after several minutes, so was a
> > bit
> > > too thin. But 50 feet would have been fine I am sure - the loss
> > was so
> > > high.
> >
> > hmmm ... just remember a pair of 4cx250s puts out at best 700w on
> > 2m, this is
> > a 20KW device ...  a 3CX15000 ...  think about the dissipation, in a
> > lossy
> > line it will be exponential .... so if 100m had say a 10db loss
> > you'd lose
> > roughly half the power in 30m, that 10kw in 30m ... or 300w per
> > metre ... I'd
> > think its life could be measured in seconds ...  apart from that,
> > RG8 would
> > probably not even stand the voltages from 20Kw into 50R,  so maybe a
> > couple
> > of dozen kilometres of LDF550 might do the trick?
> >
> > I think I'll continue the search for a load ... I now have a water
> > chiller
> > capable of handling up to 45kw, so a water cooled load is looking
> > like an
> > option :)
> >
> > --
> > Robin Szemeti
> >
> > Redpoint Consulting Limited
> > Real Solutions For A Virtual World
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> >
> >
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