>
>
> - Main function is to transmit the states (on/off) of two switches over up
> to a few meters, usually less than a meter. There will be two transmitters
> (two switches each) and one receiver.
> - The transmitters are battery-powered and need to be small. As small as
> reasonably possible, and the battery should last a year or more. I
> calculate with 1M switch state changes in that period. (The receiver is
> not
> critical, neither power nor space.)
> - The system needs to be inexpensive, with smallish quantities at least
> initially; maybe 20...50 per month.
> - It's sold to consumers in the USA (automotive application), so I think
> FCC certification of the transmitter is required.



Maybe I'm missing something, but why not use an existing keyfob? There are
several companies that sell complete units with or without matching reciever
units, presumably these have whatever certifications are neccessary. At
least one company was offering to build custom keyfob enclosures for thier
hardware, so you could have the best of both worlds (hardware with your
brand on it and not need to do compliance testing)

-Denny
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