Re: 26. NEWBEES, if possible avoid wireless alarm systems

[-pull@shoot]

On Tue, 07 Jun 2005 18:23:03 +0200, --, <> wrote:

>
>They are not reliable and are dead on warning when a transmitter
>operates in a condition who muzzle the wireless alarm system.
>
>This is easily done with Radio Transmitters operating:
>- ON the wireless frequency
>- Saturating the receiver
>- Intermodulation
>- Harmonics
>- Falling in the receiver bandpass
>- On the IF frequency
>- and more...
>This is what i call basically Radio Frequency Interferences (RFI) but
>in fact it covers, like you can notice above a lot more.
>
>In essence the problems is the fact that by no way two (or more)
>systems can use simultaneously the same frequency, its called
>collisions, interferences and more like you see above.
>
>The WORST is that the OWNER DON'T KNOW THAT HISS alarm system is no
>longer operational, no message (20 years records hold by so called
>experienced professionals: no RFI alarm).
>
>Use a wired systems and use WIRELESS only when impossible to wire, but
>BE AWARE that YOUR SAFETY IS HAZARDOUS (my system was dead during more
>than one year before i found out by accident and measuring the
>wireless receiver output signal content).
> Muzzling can occurs permanently or occasionally, mine was permanent.
>
>Note: So called low level mechanically (who claim them self
>professional) try to let you believe that my system was dumb and/or
>badly installed and they don't realize that it is an external
>influences that can't be avoided whatever wireless alarm system you
>have.
> Its a pure radio communication problem know by telecommunication
>specialists.
> There is a way around for $$$ investments but that is out of reach of
>a wireless alarm system.
>
>Paul
>NOTE: My system is replaced with a wired one, do the same.