Peter,

On Tue, 14 Sep 2004 20:20:48 -0400 (EDT), Peter L. Peres wrote:

> In fact 433 MHz is close enough to the 
> 432 MHz (ex ?) amateur band (or rather, *in* it). By the way, what's the 
> status of the 432 MHz amateur band now ?

It varies from country to country.  Known as the "70cm" band, in the UK 430 to 440MHz is an amateur band "on a 
secondary basis" - that means we can use it but others can as well so there's no protection from QRM (man-made 
interference).  It has all sorts of restrictions, and there's even a 1MHz part that can't be used within 100km 
of Charing Cross (centre of London).  They don't say why, of course, so your guess is as good as mine :-)

One of the other "users" is short-range telemetry and control, as used by traffic-reporting transmitters on 
motorways, house and car alarm and garage-door-opening transmitters, wireless headphones and 'speakers, 
weather sensors, and so on.

Cheers,


Howard Winter
St.Albans, England


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