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Posted by Roger on June 25, 2005, 5:21 am
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> How can the 868MHz frequency be controlled, rulled yes but controlled?
To sell an 868MHz product in the EU it has to conform to current standards.
Those standards are controlled. The company I work for activley looks at
868MHz products and tests them to see if they fall foul of the usage rules.
If they do they are reported and the equipment is usually removed from the
market place. In this way it is controlled. Rulled AND controlled.
> In what is it different from the 434MHz?
Do the work yourself. Get a copy of REC70-30. You will see that there are no
band occupancy rules. There are for 868MHz and this is one of the reasons
why 868MHz is a much better band for security equipment than 434MHz.
> In what official document dit you read that?
> My reference is www.ero.dk official info and yours?
The ONLY official documents - REC70-03 (Europe) and IR2030 (UK).
If you actually bother to study the documents you will see that bands set
aside for security equipment cannot be used for other non compatible
equipment. For example audio. And there are strict band occupancy rules that
are tested for at approval stages of product design.
On the subject of wireless jamming detection, why don't you get a copy of
EN50131 and check out the class 1-4 jamming detection requirements. Again,
for security equipment to pass EN50131 at any class it has to provide
defined jamming detection and reporting. All an installer has to do is buy
an approved wireless system to get a reliable wireless system. You get what
you pay for. If you buy a product that doesn't meet any standards then you
get what you deserve.
Paul, why do you bother to 'pretend' that you know what you are talking
about?. Be subjective not stupid.
So, just to repeat myself once again, you are wrong as usual Paul.
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