RE: Tunnel Radio

[dan.strassberg@att.net]

Garrett: My boss, EDN's Executuve Editor, Bill Schweber, 
wrote an article for EDN on making cell phones 
work inside subways. (Schweber, Bill, "Maintaining 
cellular connectivity indoors demands sophisticated 
design," EDN, December 21, 2000, Pg 46, also available 
at www.ednmag.com.) Now, clearly 900 MHz and 2 GHz are 
not the same as 530-1700 kHz or even 88-108 MHz. 
However, Bill started work on the article with the 
premise that he'd be discussing leaky-coax technology. 
After talking with a couple of vendors, he discovered 
that leaky coax wasn't the technology of choice; active, 
distributed antennas are. Perhaps this approach is not 
called for for bringing broadcast signals into tunnels. 
I don't know.
> <<On Thu, 8 Mar 2001 01:21:10 -0500, "A. Joseph Ross" <lawyer@world.std.com> 
> said:
> 
> > I'm curious how this system is supposed to work.  Is it a local repeater 
> > for the tunnel?  Or is it something else?
> 
> I don't know about the Dewey Square Automobile Tunnel, but I know that
> the PANYNJ tunnels under the Hudson have both AM and FM stations; they
> do this using a leaky coaxial cable and a broadband amplifier.  I
> would assume that the CA/T will be installing something similar.
> 
> -GAWollman
>