------- Forwarded Message Return-Path: owner-cypherpunks@toad.com Received: from hedera.bnr.co.uk on bnsgs200.bnr.co.uk over SMTP (5.65c/UK-2.1-MX(adur)); Thu, 17 Mar 1994 09:37:18 GMT Received: from eurogate.bnr.co.uk by hedera.bnr.co.uk with SMTP (PP); Thu, 17 Mar 1994 09:37:14 +0000 Received: from relay2.UU.NET by eurogate.bnr.co.uk with Internet SMTP (PP) id <25474-0@eurogate.bnr.co.uk>; Thu, 17 Mar 1994 09:37:08 +0000 Received: from toad.com by relay2.UU.NET with SMTP (5.61/UUNET-internet-primary) id AAwhpd03977; Thu, 17 Mar 94 04:28:59 -0500 Received: by toad.com id AA08739; Thu, 17 Mar 94 01:16:04 PST Received: from eurogate.bnr.co.uk by toad.com id AA08728; Thu, 17 Mar 94 01:15:46 PST Received: from bnr.co.uk by eurogate.bnr.co.uk with SMTP (PP) id <25199-0@eurogate.bnr.co.uk>; Thu, 17 Mar 1994 09:15:20 +0000 Received: from bnsgs200.bnr.co.uk by hedera.bnr.co.uk with SMTP (PP); Thu, 17 Mar 1994 09:15:11 +0000 Message-Id: <199403170915.5154@bnsgs200.bnr.co.uk> Received: from bnsgs207.bnr.co.uk on bnsgs200.bnr.co.uk over SMTP (5.65c/UK-2.1-MX(adur)); Thu, 17 Mar 1994 09:15:06 GMT To: Matthew J Ghio <mg5n+@andrew.cmu.edu> Cc: cypherpunks@toad.com Subject: Re: Radio Networking In-Reply-To: Your message of "Wed, 16 Mar 1994 21:12:00 EST." <YhVvlky00awO45VkcL@andrew.cmu.edu> Date: Thu, 17 Mar 1994 09:14:32 +0000 From: Ed Switalski <E.Switalski@bnr.co.uk> Sender: owner-cypherpunks@toad.com Precedence: bulk >About how far can one transmit with 250mw? *** Quite Far ! With coherent CW you can key morse Japan/US i.e cross the Pacific on a few watts. CCW involves getting the Tx master oscillator and the receivers local oscillator phase-locked (by using the local time/frequency standard transmitter (e.g. WWV MSF etc -one can also get nifty little rubidium standard clocks quite cheaply these days). US readers might care to look in the ARRL handbook for 1982 or thereabouts. CCW implies slow signalling speeds- a few baud, very narrow detection bandwidth few hertz (to match signalling) and coherent TX and RX. The ultimate limit is probably phase shift in the ionosphere. Use a frequency that a bit off Big Brother's scanner channel spacing and your emmission may not be detected -unless the spook is right on top of you. Which is just as well given it might take DAYS to download a .ps document ;-( Note this is a slow and gentle way of doing things, as opposed to a high-bandwidth, time-compressed (fairlyly high-power) "screech" transmission with somthing like meteorscatter. Regards, __o __o Ed \<, \<, _________________________________________()/ ()_____()/ ()_____________ Ed Switalski email: eswitals@bnr.co.uk Dept GM21, BNR Europe Ltd, Oakleigh Rd South, tel: +44 (0)81 945-2924 New Southgate, fax: +44 (0)81 945-3116 London, N11 1HB LON40, internal ESN (730) 2924 _______________________________________________________________________ ------- End of Forwarded Message