Re: Wireless Router onboard a modern Ship

On 22 Nov 2005 07:01:20 -0800, "aljuhani" <private.mailbox@xxxxxxxxx>
wrote:

>We have a ship with a communication computer in the Bridge (Wheel
>House) and need to connect the Captain's office directly to that
>computer as it is not part of the LAN network.

Oh-oh.

>There is of course a possibility to use wires but that is not what we
>are thinking of now as the Master office is two deck levels below the
>Bridge.
>
>The question is: how wireless signal would behave inside a ship (steel
>structure) accomedation and will there be some interference with other
>communcations equipments such as Walki-Talkis, SatCom, VHF etc. ?

The steel vessel will act as a solid barrier to 2.4Ghz. RF will not
penetrate in any way. If you find that there is a path by bouncing
around the stair wells, it will not be reliable and stable. Even if
you arrange a direct shot, the reflections from the bulkheads will
cause multipath problems. I would strongly suggest you run the
appropriate cables.

As for interefernce, it will not come from the 2.4Ghz signal. It will
be the usual clock oscillators radiating to the HF or to the VHF on
harmonics. They're low power and no worse than clocks, calculators,
or fax machines that radiate RF. The only way to determine if there
will be a problem is to try it. The good news is that you probably
won't have any interference from other 2.4GHz systems while at sea,
but will probably find it useless in port as everyone seems to be
using 2.4Ghz wireless to get internet access from the dock to the
shore.

--
Jeff Liebermann jeffl@xxxxxxxxxxxxxxxxxxxxxx
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
.

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