Re: 46. NEWBEES, external RF transmitters disturb often Wireless Alarm Systems..

["Roger" <rumble@xxxxxxxxxxxxxxxxx>]

Newbies...

Don't trust anything this child posts.

He has ignored all of the reponses that he has been given in the past from
people who know what they are talking about. I won't bother to go through
this post and correct his mistakes yet again, but trust me he's a complete
moron with no education.



<-pull@shoot> wrote in message
news:a9b9c19k82gn2fvmvgpaot9ta1qs02v60e@xxxxxxxxxx
>
> Don't thrust wireless alarm systems, use wired!!!
>
> My wireless alarm system was:
> - "deaf", muzzled for sensor signal reception
>       and
> - "dead" on alarm giving
> when i used a simple commercial available wireless radio headphone,
> that simple ..
>
> Its a well known radio transmission problem called "Radio Frequency
> Interference" (RFI)
> - present at ALL systems (old and new = external) but
> - more present than normal in wireless alarm systems due to the low
> power transmitters (10milliWatt) used in the sensors
> AND
> - the use of shared frequencies (obliged) who have disturbances and
> are unprotected for RFI (see at FCC and/or other country authorities
> for the world frequency band attribution scheme or www.ero.dk for
> official info).
>
> What type of signals are able to jeopardize they're operation?
> External RF Transmitters operating:
> - ON the wireless frequency
> - Falling in the receiver band pass
> - On the IF frequency (IF = Intermediate Frequency)
> - Intermodulation
> - Saturating the receiver front end circuit
> - Harmonics
> - 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.
>
> My wireless headphone story showed me "how simple it is" to have the
> operation jeopardized completely by an external transmitter operating
> on the wireless alarm frequency.
>
> This problem is NOT REPORTED by any mean to the owner, realize what
> can happen when you have a wireless FIRE detection system...
> The system will no longer detect it (same for intruder alarm).
>
>
> I replaced my Wireless Alarm System with a wired one; the problem is
> solved for me, what about yours?
>
>
> Some "extra clever pro's" say that the FCC (++) will locate and find
> the disturbing signal.
> 1. Just realize that the local range of the disturbing signal don't
>   allow to locate it at distance.
> 2. That other legal users share the wireless alarm frequency
>   and that they have to find out in that bunch the one whom is
>   disturbing... Good luck.
>
> Paul
>