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 Posted:
Tue Feb 01, 2005 8:57 am Post subject:
Wireless uses "433MHz", the most used frequency on earth |
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Wireless alarm systems uses 433MHz (433.92MHz in fact) the most used
frequency on earth..
Its a free use unprotected Short Range Devices = SRD (previous LPD)
frequency used by a lot of devices.
To name a few, car keys, door openers, external wireless thermometers
and pressure sensing devices, radio ham TV... and
wireless alarm systems.
Wireless alarm systems are deaf to alarm reception when Radio
Frequency Interferences (RFI) occur, they are UNRELIABLE !
Nothing can prevent RFI and on top the owner don't know that his
system is muzzled, no warning !
Marvelous.. Silent nights..
Intruders can with a simple commercial available transmitter generate
RFI and have free entrance, no alarm will disturb them.
Paul
NOTE: For SRD's qualification look at www.ero.dk for official info
and smile humble
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