Re: Transrapid Maglev

[stang@iweb.net.au (Aidan Stanger)]

David Bromage <dbromage@metz.une.edu.au> wrote:

> David Cowans (davec@ozemail.com.au) wrote:
> >On 7 May 1998 04:00:53 GMT, dbromage@metz.une.edu.au (David Bromage)
> >wrote:
> >
> >>There could be another problem with running at such speeds (550km/h). As
> >>such a service would be mainly aimed at the business market, it stands to
> >>reason that many would be carrying digital mobile phones, some of which
> >>would be used for connecting laptop computers. GSM phones use a doppler
> >>system for calculating the distance between the phone and the tower, and
> >>adjust the broadcast strength accordingly. At the sort of speed a
> >>Transrapid would be doing, it would play havoc with the doppler and could
> >>cause the phone to cut out. 
> >
> >Oh, what a pity....
> 
> You can't use a mobile phone in the air because it interferes with
> navigation. The point I was trying to make is that the high speed
> eliminates one of the selling points of the service to business
> travellers.

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.

--
Aidan Stanger
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