Re: 47. PURSHASE wireless alarm (pro recommendation).

[Crash Gordon® <webmaster@xxxxxxxxxxxxxxxxxxxxx>]

I guess every cellphone in existence has it's own frequency by your =
logic.
Paul, your such an idiot.
<plonktime>


<-pull-@-shoot-> wrote in message =
news:5g8hc1pb413cpq3b3543lvqqm3gq5m93c9@xxxxxxxxxx
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| Be a member of "the" wireless alarm community...
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| Purchase YOUR wireless alarm system and you will have TWO outcomes:
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|  OR the system will fail completely during Radio Frequency
|     Interferences (RFI) and you will not be aware of it;
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|  OR you will have nice nightmares coming up if in your wireless
|     alarm system there is a RFI detection circuitry as described by
|     "SO CALLED" Pro's (without manufacturer data support).
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| ANYHOW in both cases your system will fail completely with or without
| noise and you will have no intruder alarm detection and warning.
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| What type of signals are able to produce RFI (Radio Frequency
| Interference) on Wireless Alarm Systems and will jeopardize they're
| operation?
| RF Transmitters operating:
| - ON the wireless frequency (434 & 868 MHz)
| - Falling in the receiver bandpass (sideband rejection is poor)
| - Saturating the receiver input stage (wide band in all systems)
| - Intermodulation (mix of two signals)
| - Harmonics
| - On the IF frequency
| - and more...
| In essence the problems caused by interference is the fact that by no
| way two (or more) systems can use simultaneously the same frequency.
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|  If that famous "undocumented" and "manufacturer unsupported" RFI
| detection feature would exist by any chance, be aware that the
| wireless RFI alarm night OWL will keep "you and police" awake with
| false alarms!
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|  Paul
|