[TowerTalk] Radio's/tunnels

[Joe Reisert]

Dave,

Radiax is a product of the Andrews Corporation. It is essentially a Heliax 
(RTM) type coax with small holes or openings in the shield to allow some RF 
to exit. It's primary use is in tunnels, buildings etc. where the need for 
a distributed RF is required, typically at 450 MHz. It's been around a long 
time (over 20 years for sure) and now has competitors.

73,

Joe, W1JR

At 08:39 AM 5/4/00 -0700, Curtis, David B wrote:

>*I* haven't heard of Radiax. Please tell us about this wonderous product.
>73, Dave N6NZ
>
>-----Original Message-----
>From: Robin E. Midgett [mailto:rmidgett@bellsouth.net]
>Sent: Wednesday, May 03, 2000 6:29 PM
>To: alsopb; towertalk@contesting.com
>Subject: Re: [TowerTalk] Radio's/tunnels
>
>
>
>I wonder if the D.C. services ever heard of Radiax?
>
>
>At 08:16 AM 5/2/2000 +0000, alsopb wrote:
>
> >This is an extract from the Wash. Post.
> >
> >Radios Hampered Response to Metro Fire
> >
> >By Lyndsey Layton
> >Washington Post Staff Writer
> >Tuesday , May 2, 2000 ; A01
> >
> >Trapped passengers could have been rescued and subway service restored
> >in 70 minutes instead of four hours, if the telephones and radios of
> >the D.C. fire department had not repeatedly cut out or temporarily
> >gone dead, Metro officials said yesterday in a review of the April 20
> >tunnel fire.
> >
> >Firefighters who rushed to the tunnel between the Farragut West and
> >Foggy Bottom stations shortly after 5 p.m. found themselves in a
> >"communications blackout," unable to talk to each other on their
> >hand-held radios or to Metro officials on their cellular telephones,
> >said Fred Goodine, Metro's chief safety officer. Fire officials say
> >they
> >still don't know what caused the problems.
> >*********************************************************
> >
> >Have people strayed so far from reality that they don't realized
> >radios don't work in underground tunnels?  This
> >ignorance/unpreparedness could have cost lives.
> >
> >They say later in the article that they will have to string "antennas"
> >in the tunnels in the future.
> >
> >It is a tribute to the RF engineers that radios are so reliable in so
> >many instances that people take them for granted and forget they have
> >limitations.  Their "success" lead to these problems.
> >
> >de Brian/K3KO
> >
> >--
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>73,
>Robin E. Midgett KB4IDC EM66se
>rmidgett@bellsouth.net
>1/2 of the Award Winning NT4L Rover Team
>http://www.almostanywhere.com/vhf/vhf.html
>
>
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>
>
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