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HELP WANTED FOR FITTING OUT TUNNEL SYSTEM WITH ANTENNA NETWORK

I am designing a wireless ethernet radio network for a rail system using Cisco Arlan AP350 Access Points and WGB350 Work Group Bridge radios . Comunications will be between a land based LAN and mobile trains in the rail system. I would appreciate help from anyone with experience in designing such a network. In particular, the anttenas used, thier location etc ...

cheers

Ray Piscopo

2 REPLIES
New Member

Re: HELP WANTED FOR FITTING OUT TUNNEL SYSTEM WITH ANTENNA NETWO

Ray,

Dependent on the tunnel length, size, and construction methods you may want to look at a product such as "Radiating Cable" or leaky cable as we use to call it. Basically it is a high quality transmission line that has a series of milled holes or apertures along the outer conductor, which allow the RF energy to pass thru. The cable tends to provide a lower level of energy at a given distance from the antenna, but fairly consistent along a great distance, useful if the tunnel is curved. This may or may not be the right solution or even a cost effective solution but one you should look into. Check with Tessco ( www.tessco.com) as they distribute this from several vendors.

Don’t forget to include the potential loss from making the transition from the connector on the AP or Bridge to the cable (typically a “N” series connector) when looking at a power budget.

It’s been years since I used it with some 900MHz radios but it did the trick in specific applications.

Green

Re: HELP WANTED FOR FITTING OUT TUNNEL SYSTEM WITH ANTENNA NETWO

Another "leaky cable" product:

Radiax

From Andrew Corp. www.andrew.com

They also offer engineering and design services. Lots of experiance with tunnel radio systems.

Good Luck

Scott

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