Return-Path: Received: from pop3.olsusa.com ([63.150.212.2] verified) by logan.com (CommuniGate Pro SMTP 3.5b3) with ESMTP id 860431 for rob@logan.com; Sat, 01 Sep 2001 13:07:19 -0400 Received: from pscgate.progress.com ([192.77.186.1]) by pop3.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-71866U8000L800S0V35) with ESMTP id com for ; Sat, 1 Sep 2001 09:18:03 -0400 Received: from elvirus.progress.com (elvirus [192.77.186.100]) by pscgate.progress.com (8.11.6/8.11.6/PSC-4.06) with ESMTP id f819isY24351 for ; Sat, 1 Sep 2001 05:44:54 -0400 (EDT) Received: from progress.COM (localhost [127.0.0.1]) by elvirus.progress.com (8.10.2/8.10.2/PSC-4.01) with ESMTP id f819ism26563 for ; Sat, 1 Sep 2001 05:44:54 -0400 (EDT) Received: from naserv.bedford.progress.com (naserv [172.16.5.174]) by progress.COM (8.7.2/PSC-1.0) with ESMTP id FAA09161 for ; Sat, 1 Sep 2001 05:44:53 -0400 (EDT) Received: from earthlink.net ([172.16.108.25]) by naserv.bedford.progress.com (Netscape Messaging Server 4.15) with ESMTP id GIZ9QO00.AH6 for ; Sat, 1 Sep 2001 05:44:48 -0400 Message-ID: <3B90AD12.15BB1057@earthlink.net> Date: Sat, 01 Sep 2001 05:40:34 -0400 From: Marcelo Pacheco Organization: PROGRESS Software Professional Services MIME-Version: 1.0 To: lancair.list@olsusa.com Subject: Re: CDPD Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Scott Dahlgreen wrote: >Marcelo Pacheco, > >Perhaps you could elaborate on the CDPD scheme for the group. > >I am interested in getting data on my laptop in flight. Could I get a CDPD modem and receive data via the internet? Can one get a CDPD modem and receive data via the internet ? The short answer is probably yes. CDPD uses 900 Mhz digital celullar communication, which isn't AMPS, so it shouldn't suffer from the FCC restrictions on its use. However, being cellular, it means there are lots of active cells in reach at altitude, so there's a good likelyhood of overloading their system by airborne use. There are also potential doppler effects, at the speeds a Lancair fly, where the doppler shift cause by our speeds can cause data transfer errors. However I read reports from people illegally using Omnisky (same that Palm uses) successfully from airliners at 18000ft, at which speed any jet would be doing at least 300ktas, so this might not be an issue. Those providers give you unlimited service at a reasonable price when compared to satellite based solutions, at the cost of restricted coverage (omnisky for example has very large uncovered areas, specially when away from densely populated areas, but who knows how far away we'll be able to talk at 18000ft ???). >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>