[NLRS] 439MHZ Radar

Sat, 12 Apr 2003 10:28:46 -0400

Yes indeed Jerry, we freak out when water enters a telephone
exchange for whatever reason. We have started putting in water
detectors and shutoff systems in our exchanges... This of course 
doesn't work if the roof leaks, which happened once. Being a 
network operations technician for Canada's largest independant
phone company, I'd never thought I would be pushing a mop and a
wet/dry vacuum around the exchange...

Ed VE3KRP/VA3KRP

----- Original Message ----- 
From: "Dr. Gerald N. Johnson, electrical engineer" <[email protected]>
To: <[email protected]>
Cc: <[email protected]>
Sent: Friday, April 11, 2003 10:44 PM
Subject: Re: [NLRS] 439MHZ Radar

> Ah, I should have been more correct to say, "cooled with a none acqueous
> syntetic high dielectric liquid." For some reason I silicone on the
> brain at the time so I called it a silicon oil.
> 
> Water does cause problems in computers when it spills. More damage in
> telephone exchange computers where the ringing voltage is enough to etch
> away significant board traces while immersed in nearly clean water.
> 
> Much of the test speed of the Intel and AMD chips depends on executing
> from on chip cache. Swapping tasks that are larger than the on chip
> cache is a performance killer.
> 
> Back in the mid 60s, Collins used Dowtherm-A for cooling a 250 KW dummy
> load. It was supposed to be inert and to not bother people, but we found
> its fumes could be ignited explosively. And when we kept technicians
> immersed up beyond their elbow for a week or two at a time, they claimed
> to be ill as the result. Might have been a reaction or reluctance to
> keep swimming in the Dowtherm-A whose odor was not very pleasant.
> 
> 73, Jerry, K0CQ
> -- 
> Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
> Reproduction by permission only.
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