Hi,
Its not a sat solution, I know, but what about sending the data
through the tracks akin to how they modulate data onto power lines. I
hear up to a Mbit is possible.
No problems with tunnels then eh?
jm
>All,
>
>Regarding mobile autotracking antennas for data services, see:
>
>http://www.datrondbs.com/p4500RV.html or
>http://www.datrondbs.com/p4500Marine.html
>
>I believe Datron has also experimented with mobile Internet services using
>these antennas.
>
>Regards, mcm
>
>Michael C. Maguire
>email: [email protected]
>
>
>-----Original Message-----
>From: [email protected] [mailto:[email protected]]On
>Behalf Of Andreas Timm-Giel
>Sent: Tuesday, 03 October, 2000 22:38
>To: [email protected]; [email protected]
>Subject: AW: Moving Targets
><snip>
>GEO systems are available serving your bandwidth requirements. However, if
>you think of Ku/Ka-band systems, the antenna pointing is critical (in
>particular with this speed). If you are looking for GEO L-, S-band systems
>you could most get an autotracking antenna, which is fast enough for your
>trains. However it is rather bulky (would assume around 1 m in diameter),
>very much depending on the satellite you use. Additionally you would always
>need a line-of-sight (difficult with tunnels). Second problem for L- and
>S-band systems will be the prices for capacity on satellites (just as a
>reference: Inmarsat takes around US$ 7 / min for a 64 kbit/s link)
><snip>
>Andreas
>
>---
>------------------------------------
>Dr.-Ing. Andreas Timm-Giel
>MediaMobil Communication GmbH
>Fahrenheitstr. 1
>D - 28359 BREMEN
>Germany
>
>Phone: +49 (0) 421 20 10 088
>Fax: +49 (0) 421 22 39 418
>
>email: [email protected]
>------------------------------------
><snip>
--[email protected] Chief Science Officer ------------------------------------------------------------------ "The Global Leader in Internet Via Satellite" InterPacket Networks, Inc. http://www.interpacket.net 1901 Main St. tel (310) 382 3300 Santa Monica, California 90405 fax (310) 382 3310 ------------------------------------------------------------------
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