Guest
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 Posted:
Fri May 27, 2005 8:35 am Post subject:
18/ Why does RFI jeopardize wireless alarm opperation? |
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In Wireless alarm systems, the internal required wireless receiver is
put during Radio Frequency Interference (RFI) in a position that he is
UNABLE TO RECEIVE and DECODE ANY sensor signal and by consequence he
is unable to give any kind of warning.
"ALL" wireless alarm system (new and old) uses SHARED frequencies who
are unprotected and of free use.
RFI is a normal deal on those shared frequencies due to the
asynchronous burst principle who has to be used by the equipments
(look at www.ero.dk for "official" regulation info).
The permanent system interference conflicts who occur due to the
asynchronous bursts are normal and handled with ID decoding, however,
an extern transmissions escape on this ID selection rule and render
decoding nonexistent.
Non system generated RFI's escape the system reliability possibility.
A lot of external transmissions generate RFI, they are unpredictable
and a unavoidable nuisances who muzzle the wireless alarm systems,
that's the tradeoff limit of wireless alarm systems.
Go "wired" and have a more reliable system.
Paul
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Guest
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| Posted:
Sat Jul 02, 2005 2:29 pm Post subject:
Re: 18/ Why does RFI jeopardize wireless alarm opperation? |
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On Fri, 27 May 2005 05:46:13 +0200, -pull@shoot wrote:
| Quote: |
In Wireless alarm systems, the internal required wireless receiver is
put during Radio Frequency Interference (RFI) in a position that he is
UNABLE TO RECEIVE and DECODE ANY sensor signal and by consequence he
is unable to give any kind of warning.
"ALL" wireless alarm system (new and old) uses SHARED frequencies who
are unprotected and of free use.
RFI is a normal deal on those shared frequencies due to the
asynchronous burst principle who has to be used by the equipments
(look at www.ero.dk for "official" regulation info).
The permanent system interference conflicts who occur due to the
asynchronous bursts are normal and handled with ID decoding, however,
an extern transmissions escape on this ID selection rule and render
decoding nonexistent.
Non system generated RFI's escape the system reliability possibility.
A lot of external transmissions generate RFI, they are unpredictable
and a unavoidable nuisances who muzzle the wireless alarm systems,
that's the tradeoff limit of wireless alarm systems.
Go "wired" and have a more reliable system.
Paul |
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