Article View: alt.cellular.fido
Article #14Re: Why GSM in such a big country like Canada ?
From: MH
Date: Thu, 19 Apr 2001 02:08
Date: Thu, 19 Apr 2001 02:08
22 lines
2761 bytes
2761 bytes
"James Knott" <the.lights.are.on.but.no.one.is@home.com> wrote in message news:3ADD7EAE.F97EE62@home.com... > Actually, it will be somewhat less, depending on altitude. Only > something at a very great distance from the earth can see an entire > hemisphere. Hence the need for multiple satellites for Irridium and > Globalstar. Even geosync sats see only a bit more than 1/3 of the > earth. The practical coverage limit is more or less like what you said, because at the fringe areas of the hemisphere the satellite is likely obscured by terrain features and buildings. > Al Klein wrote: > > No. A 'cell' in space sees a hemisphere with a radius (from the point > > directly under the cell) of 12,500 miles. That's the coverage of a > > satellite phone 'cell'. The technology does exist to partition the entire visible area into smaller cells, so all those nice things in cellular systems like frequency reuse can be applied. I don't think any existing satellite phone system has a cell nearly that big.
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 10774d,f6bfd0395fb1ea2d X-Google-Attributes: gid10774d,public X-Google-Thread: fb718,f6bfd0395fb1ea2d X-Google-Attributes: gidfb718,public X-Google-Thread: 105fb2,f6bfd0395fb1ea2d X-Google-Attributes: gid105fb2,public X-Google-ArrivalTime: 2001-04-18 19:08:10 PST Path: arc1-ca.pugleaf.net!supernews.google.com!newsfeed.google.com!newsfeed.stanford.edu!canoe.uoregon.edu!logbridge.uoregon.edu!newsfeed.direct.ca!look.ca!newsfeed1.earthlink.net!newsfeed.earthlink.net!newsmaster1.prod.itd.earthlink.net!newsread1.prod.itd.earthlink.net.POSTED!not-for-mail From: "MH" <szuyuanhuangNOSPAM@earthlink.net> Newsgroups: alt.cellular.fido,alt.cellular,aus.comms.mobile References: <CABFD5B1F2CD777D.CD5FDE1048A474DD.CCD35D6B55884796@lp.airnews.net> <cCJC6.11861$W7.63061@news-server.bigpond.net.au> <3adb7f4c.6682274@news> <8v8ndtgs395egi7tbktc9lirmofruuuc9s@4ax.com> <hGNC6.680827$JT5.18112031@news20.bellglobal.com> <h99pdt8lm4gikulgehcdqf4ri4cd60b2o3@4ax.com> <3ADD7EAE.F97EE62@home.com> Subject: Re: Why GSM in such a big country like Canada ? Lines: 24 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.50.4522.1200 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4522.1200 Message-ID: <eMrD6.2500$042.263190@newsread1.prod.itd.earthlink.net> Date: Thu, 19 Apr 2001 02:08:10 GMT NNTP-Posting-Host: 4.3.184.185 X-Complaints-To: abuse@earthlink.net X-Trace: newsread1.prod.itd.earthlink.net 987646090 4.3.184.185 (Wed, 18 Apr 2001 19:08:10 PDT) NNTP-Posting-Date: Wed, 18 Apr 2001 19:08:10 PDT Organization: EarthLink Inc. -- http://www.EarthLink.net X-Received-Date: Wed, 18 Apr 2001 19:06:50 PDT (newsmaster1.prod.itd.earthlink.net)