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To: Matthew J Ghio <[email protected]>
Cc: [email protected]
Subject: Re: Radio Networking
In-Reply-To: Your message of "Wed, 16 Mar 1994 21:12:00 EST." <[email protected]>
Date: Thu, 17 Mar 1994 09:14:32 +0000
From: Ed Switalski <[email protected]>
Sender: [email protected]
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: [email protected]
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
_______________________________________________________________________
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