Re: Signal at high speed (was: Re: [NSW] Guards & Mobile phones)

["deano" <dsma@pigpond.com>]

Don't digital mobiles use a timing pulse to determine the distance of the
phone from the base station??
When the handset gets to a preset distance it disconnects if no alterate
base is available even if satisfactory signal strength remains. Maybe a
rapid variation in determination of distance to base is seen as an invalid
result with a subsequent autodisconnect. My digital drops out at about 32 km
from the base even though the base remains clearly visible and the signal
strength is more than adequate. This happens at several isolated sites with
high mountians nearby. You drive up into the hills and can see the base but
no service, move 200 metres down the road and full signal and service.
Andrew Price <aprice@mail.dotcom.fr> wrote in message
juacisgj21iscq4m3dstejka1mja36au4j@4ax.com">news:juacisgj21iscq4m3dstejka1mja36au4j@4ax.com...
> On Sat, 20 May 2000 14:46:04 +1000, "Chris Downs"
> <cvdowns@ozemail.com.au> wrote:
>
> >How significant is the Doppler effect in a train travelling at 83.3m/s
> >(300km/h) compared with the speed of radio waves 300,000,000m/s (approx
1.1
> >billion km/h)?
> >
> >Maybe the speed of moving from one base station to another and loss of
> >signal strength has a greater effect?
>
> I also suspect that this is the real cause of the problem.  In any
> event, mobile phone performance from a TGV is very mediocre.