Re: Transrapid Maglev

["Doug Rosser" <drosser@btr.com.au>]

The trick would be to franchise someone to provide an on-board GSM cell and
provide connection to the main phone network over a specialised data link
(type not known by me but surely not hard) that runs along the trackside and
links to the car. It could be billed like a 1900 number as a surchage on
usage. It would need to be someone separate from the three mobile operators
as they do not roam onto each others networks.
Sort of a hi tech version of the leaky coax that runs through the Sydney
harbour Tunnel to provide connectivity while you are submersed.
Doug
Michael Kurkowski wrote in message <355978B8.73168E9C@tig.com.au>...
>Aidan Stanger wrote:
>>
>>
>> Are you sure they use a doppler system? I can't see how that would work,
>> or why they don't just calculate from the strength of the signal
>> received (as I thought they did). Even if the mobile phones don't work,
>> you can still install phones that do on the trains. No problem.
>
>I think what you will find is that at higher speeds you would be
>creating a doppler effect which will play havoc with the GSM phones,
>since they require complete accuracy in operation. This is why you find
>that from any base station to standard GSM specification you cannot
>operate the telephone from further than a 32.5 (is this the exact
>figure?) KM radius due to the latency of the signal recieved to-from the
>base. This is also the reason that GSM signals can be fairly poor when
>in amongst buildings or wet trees, even though you may be close to the
>base station you can find that your signal may be high, but the quality
>of your conversation may have left little to be desired. As a result of
>this, the high speeds of the trains mentioned in above threads can
>directly affect the accuracy of which the base recieves the signal.
>
>Mick.
>
>--
>Mr Michael Kurkowski.
>Email: simcard@tig.com.au
>Snail Mail: P.O. Box 337 Glenroy, VIC 3046
>Web: http://simcard.base.org  ICQ: 1459118
>--------------------------------------------------
>Thought for today: Due to the sale of the light at
> the end of the tunnel to the private sector, it
>  will only operate in the hours of 5pm til 9am.