I need a very low cost wireless thermometer to cover 30 miles (near 
line of sight). I have a ham license, so I can legally boost the 433 
MHz part 5 wireless remote units that come with low cost Atomic 
Clocks that have facilities for monitoring temperatures from several 
wireless remote sending units (provided I can figure out how to key 
the transmitter to make it ID with my callsign).

Needs to be low cost.

It occurred to me that boosting one of these very low power 
transmitters and feeding it into a real antenna might piss off lots 
of nearby users tho, so I'd really prefer to roll my own system.

Has anyone hacked into these wireless remote temperature sensors such 
as the Oregon Scientific THR138? Changing the frequency of the 
receiver and transmitter slightly (to move it off the commonly used 
433 Mhz channels),  is probably practical.

Thanks,

Art



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