Micrel Semiconductor has just release some impressive chip that can do just as
you asked with fewest components around. I'm currently going to do the same
thing when I get to that part of my project.
drcman@jps.net

Harrison Cooper wrote:

> Long time ago...in a galaxy...wait...thats a movie.
>
> Long time ago...when the guru Andrew Warren was around, he and I had some
> discussions on what needed a license, and what did not.
>
> Basically, anything that is telemetry, like alarms, or an "are you alive"
> signal does not need a license.  If it was a RS232 link, it would because
> now its data, and data eats up bandwidth, etc.
>
> I have used DVP modules, with good success (external antenna tho).
>
> -----Original Message-----
> From: John Payson [mailto:supercat@CIRCAD.COM]
> Sent: Wednesday, April 28, 1999 11:19 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Cheap 900MHz RF low-speed short-range data solutions?
>
> Does anyone here have any experience with using 900MHz RF data devices?
> I'm looking for a short range (<20ft) transmit/receiver pair that can
> easily be used to send an "activation" signal.  This would be for use in
> a consumer product, so FCC approval is essential.  I've seen various 314Mhz
> devices [e.g. the Ming thingies] which would be adequate except that they're
> not FCC approved and I can't find any specs about what one can transmit at
> that frequency.  The 900Mhz band is basically a free-for-all, and at 20' it
> shouldn't be too hard for a transmitter to win out over other users of that
> band.
>
> BTW, this application won't necessarily be line-of-sight.  If it were, I'd
> use infra-red.



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