11W inside of a building means suicide for the people living in the
office where the transmitter is installed.
I doubt he read the standard before claiming he can use 11W.
I even bet.

Vasile

On 10/14/06, Denny Esterline <firmware@tds.net> wrote:
> Maybe I missed something - this sounds too easy.
>
> Power at the transmitter is effectively unlimited, right? (o.k. 11 watts, but that's still lots) Why not just send a time signal out continuously, and let the receiver read it whenever it wakes up? The transmitted data stream could be a time packet followed by some form of sync pulse - something like $5A5A, then the reciever snychronizes with the next rising edge.
>
> I'm more interested in why the units need that level of sync.
>
> -Denny
>
>
>
>
> > I'm currently working on a design with a specific problem, which I'm
> > hoping someone will have come across before.
> >
> > Essentially I have several remote circuits, which must remain unconnected.
> > They all need to be synchronised within 100 Micro Seconds.
> >
> > Essentially we are looking at deploying a beacon transmittor which will
> > send out a pulse at known intervals and have low power recievers on each
> > circuit which come out of hibernation at the required interval, to reset
> > the onboard clocks appropiatly.
> >
> > We are looking at achieving 100m range (indoors), however power at the
> > beacons is not a significant problem (we have 11Watts available, and these
> > are not battery powered). Power at the recievers is crucial, each circuit
> > is powered by battery and must be capable of running for a minimum period
> > of a year. Physical battery size is not crucial but small is better :)
> >
> > Does anyone have any other suggestions how to achieve the required
> > synchronisation, or can anyone suggest any suitable radio IC's/circuits
> > which could be used as I am stuggling to find anything useful via google
> > (must be using the wrong keywords)
> >
> > Any suggestions or comments would be greatly appreciated.
> >
> > Mat
> >
> >
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