FCC regulations allow 100 millewatts of transmitter power
without legal problems. with tuned antennas on both ends
it'd be no problem going that far. I have used 50mhz cordless
phones with tuned anttennas across 3000 feet.
however, for data transfers, the way to go is an fm transmitter,
kits and boards for 10-20$. each can be set to a different
frequency of dead air in your area with regular fm radios to
receive on each end. the speaker/microphone outputs need to
be fed to a phone patch, and thence into a regular modem for
regular full duplex operation; at this range you should easily
get 56k.
each end transmits on one freq, and listens on the other.
This is already routinely done in the third world, to hook
up computers in remote villages to talk with each other or
to an urban hub for net access.
uncopywritten- do what you will with it.
-- Arachne V1.68, NON-COMMERCIAL copy, http://arachne.cz/
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