In message , at
13:52:52 on Mon, 12 Sep 2011, Mike Coon remarked:
I didn't know there was such a thing as satellite WiFi. Are these
geostationary (over the equator), or does the "straightforward servo system"
have to compute the satellite orbit too?

It's satellite Internet, which has been available for more than a
decade, plus a wifi hotspot to deliver it to the users. When I was
playing with this about 12 years ago they used redundant transponders on
regular TV satellites, which are geostationary. But there are dedicated
satellites too.

Here's some details of the Boeing in-flight system:

http://en.wikipedia.org/wiki/Connexion_by_Boeing
--
Roland Perry

On Mon, 12 Sep 2011 14:03:42 +0100
Roland Perry wrote:
Never seen a flight simulator cabin close up? The servos in those move a
substantial weight very quickly and precisely.

I'm sure the mechanical side its simple , I'm wondering how they keep an
accurate lock on the satellite however. Does it actively scan for the signal
or does it take readings from the planes GPS & gyroscopes and work out
where it should be?

B2003

In message , at 13:22:55 on Mon, 12 Sep
2011, d remarked:
Never seen a flight simulator cabin close up? The servos in those move a
substantial weight very quickly and precisely.

I'm sure the mechanical side its simple , I'm wondering how they keep an
accurate lock on the satellite however. Does it actively scan for the signal
or does it take readings from the planes GPS & gyroscopes and work out
where it should be?

Read up about the Boeing system, I know that works. It's also $500k to
install per plane, so not a child's toy.
--
Roland Perry

On Sun, 11 Sep 2011 20:39:02 +0100, Roland Perry wrote:

In message
, at
10:53:11 on Sun, 11 Sep 2011, Mizter T remarked:
Perhaps the most pertinent point is that no telecoms company has as yet
installed any mobile access on the LU network, even just on stations

Wrong. Rabbit installed base stations at many Underground stations. I'm
not sure how many, but it was at least Zone 1/2.

My local tube station is in zone 5, and I quite often used the Rabbit base
station which was there.

On Mon, 12 Sep 2011 12:01:10 +0000, Huge wrote:

On 2011-09-12, Bob Eager wrote:
On Mon, 12 Sep 2011 10:06:08 +0000, Huge wrote:

On 2011-09-12, DrTeeth wrote:
On Sat, 10 Sep 2011 23:09:42 +0100, just as I was about to take a
herb, Adrian C disturbed my reverie and wrote:

In the past, there has been discussion about allowing mobile phone
operators to install base stations below ground and provide some
coverage for folks on trains.

It will get blocked by numpties worried about 'radiation'.

Good. Not because of "radiation", which is of course utter tosh, but
because it means normal human beings will not have to sit between 2
morons having trivial conversations about utter ****.

http://goo.gl/U4RpK

Believe me, in the days when I commuted in and out of London every day,
I gave it serious thought. Oh, the joys of working from home and "quiet
coaches" on East Midlands Trains.

Ah well, the joys (here) of a ten minute drive to work, through the woods!

--
Use the BIG mirror service in the UK:
http://www.mirrorservice.org

*lightning protection* - a w_tom conductor

On 12/09/2011 13:01, Huge wrote:
On 2011-09-12, Bob wrote:
On Mon, 12 Sep 2011 10:06:08 +0000, Huge wrote:

On 2011-09-12, wrote:
On Sat, 10 Sep 2011 23:09:42 +0100, just as I was about to take a herb,
Adrian disturbed my reverie and wrote:

In the past, there has been discussion about allowing mobile phone
operators to install base stations below ground and provide some
coverage for folks on trains.

It will get blocked by numpties worried about 'radiation'.

Good. Not because of "radiation", which is of course utter tosh, but
because it means normal human beings will not have to sit between 2
morons having trivial conversations about utter ****.

http://goo.gl/U4RpK

Believe me, in the days when I commuted in and out of London every day, I
gave it serious thought. Oh, the joys of working from home and "quiet
coaches" on East Midlands Trains.


I once heard a tale of some 20-something on a train, subjecting the rest
of the carriage to his drivel about absolutely nothing. It got so that
one person decided that he had enough, got up, grabbed the idiot's
mobile phone out of his hand and tossed it out the window.

I think that the rest of the carriage was pretty pleased about that.

In article
s.com, Mizter T scribeth thus

On Sep 11, 8:33*pm, tony sayer wrote:

In article , Roland Perry
scribeth thus

In message
, at
07:53:32 on Sun, 11 Sep 2011, Mizter T remarked:
Fitting equipment in deep level tunnels however isn't
that easy a proposition - there'd need to be a near enough as can be
100% guarantee that it wouldn't catch fire, nor interfere with any
safety critical LU kit such as signalling or comms, plus there'd be
the very real issue of maintenance access.

They fitted mobile access into the Heathrow Express tunnels years ago.
Also the tunnel on the Oslo airport express. None of the issues you
mention would be special to the London tubes.

Wouldn't be any problem at all Google "leaky feeder" if your interested.

Plenty of it in tunnels already!...

I know about leaky feeders, but I'd posit that they don't seem to
offer the completely painless trouble free solution that you suggest,
lest it would have happened already. My guess is that the problematic
issue is in installing equipment at the stations to service any leaky
feeders.


Shouldn't be just consider it as a very long leaking coax cable. If you
need to extend it you just repeat it as such...

The installation of the cross-track video projectors (to project ads
on the far side of the tunnel wall) shows that where there's a will -
i.e. lots of dosh - there's a way, but thus far there doesn't seem to
have been enough of a will/ enough wonga to have make it happen.

Well personally I find the tube LOUD enough without more noise "I'm in
or on the underground!!!"
--
Tony Sayer

In article , Mike
Coon scribeth thus
Mizter T wrote:
I know about leaky feeders, but I'd posit that they don't seem to
offer the completely painless trouble free solution that you suggest,

I've heard of leaky feeders, but not just how much of a solution they
represent. For instance, do they operate bi-directionally? I have difficulty
imagining that they could pick up sufficient signal directly from phones to
do all the essential handshaking without needing some special equipment on
the trains to act as intermediaries.

Mike.

Yes there're just like a large long aerial Transmit and receive...
--
Tony Sayer

In article , d
scribeth thus
On Mon, 12 Sep 2011 11:35:44 +0100
Roland Perry wrote:
In message , at 11:03:48 on
Mon, 12 Sep 2011, DrTeeth remarked:
In the past, there has been discussion about allowing mobile phone
operators to install base stations below ground and provide some
coverage for folks on trains.

It will get blocked by numpties worried about 'radiation'.

Although the leaky feeder (rather than base-station) approach will
defuse that argument immediately.

Do leaky feeders of the length that would be required work at 1800Mhz?

B2003



Yes, just the losses rise..
--
Tony Sayer

Paul Corfield wrote:
On Sat, 10 Sep 2011 23:09:42 +0100, Adrian C
wrote:

In the past, there has been discussion about allowing mobile phone
operators to install base stations below ground and provide some
coverage for folks on trains. This is yet to happen?

There was an announcement many months ago that mobile phone coverage
below ground would not be implemented.

Of course it won't, the political interests on the Multi £B Tetra gravy
train
would be proved to be the piglets they are should GSM be introduced
on the tube

http://en.wikipedia.org/wiki/Connect_Project

I've travelled on Hong Kong MTR which has had GSM using leaky feeders
since at least 2001, as long as callers use a little discretion it works
fine.

http://en.wikipedia.org/wiki/MTR

Steve Terry
--
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