IF line of sight, free air light may be viable. Laser pointer
+ACI-should+ACI- be
usable at many 100's of meters.

Even a LED can do 1km plus with modest optics and lots of pain. Best
results I have seen claim several miles AFAIR.

You can now buy spread spectrum modules for NZ use (price unknown) that
have very respectable range (10's of Kms) and AFAIR 900 MHz operation.
Won't be totally cheap. Company name escapes me. Email me if interested and
I will dig it up.

Various other low cost RF modules are available.
What range?

Russell McMahon


From: Rob Bakker +ADw-Rob+AEA-MAILSERV.WAIKATO.AC.NZ+AD4-

+AD4-Many thanks for your thoughts people,  but i would like to be able to
+AD4-transmit data a little further down the powerlines than just to the
next
+AD4-pole transformer.  Anyone know of a device able to do this?
+AD4-
+AD4-I have thought of:-
+AD4-- something along the lines of X10
+AD4-- modem/telecom but its would be too expensive to pay for a line only
to
use
+AD4-it once a month..
+AD4-- radio link ( 2.4 Ghz ) but this gets tricky to set up and it seems a
shame
+AD4-to waste all the bandwidth just to send data +AEA- 2400bps from a PIC