Thanks for the info, I hadnt come across remote wake up devices before, I
shall look into this further.

Mat

> There are data transmitters and receivers available from several
> vendors that are data ready. They are used in short range automotive
> applications, such as low tire pressure warning.
>
> You might google for those. They use very low power and have agc so
> they can be woken up by a brief high power transmitter pulse, then
> can transmit data for extended periods at a much lower transmitter
> power, which saves the batteries.
>
> Some have globally unique serial numbers embedded in them which
> identifies which transmitter has been activated.
>
> Enjoy.
>
> Art
>
>
>
> At 10:12 AM 10/13/2006, you wrote:
>
>>You might look into the low power VLF receivers for WWVL.
>>I'm not sure if it meets your accuracy requirement, but it would remove
>> the
>>need for any transmitter.
>>
>>
>>
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