On 03/03/04 12:09, Anthony said...
3) (my initial point) that RF was subdivided differently
around the world long before Prontos, X10 and
even cell phones were even a dream, and there
might be good reasons other then market protection
that makes it so that the same frequency cannot
be used in different countries.
So why did the UK switch from 418MHz to 433.92MHz about two years ago when CE realigned the frequencies used by the EU countries?
It only takes one transistor and a few passive components to make a low power RF transmitter. Philips engineers are probably capable of designing one from scratch. If not, they can find numerous schematics on the web. Or, in OEM quantities, they can buy them for less than $1.
http://www.telecontrolli.com/See the PDF files for their SAW controlled transmitters. Most include schematics.
And while the USA allows 433.92MHz, Canada does not.
