Re: remote interference in a wireless security system

["Roland" <roland@xxxxxxxxxxxx>]

I am certainly no expert in RF signal propagation. My bias is not to use any
RF devices in an alarm system when possible.
Here is what you might be talking about. Here is how a different
manufacturer deals with issues effecting RF alarm signals and how it alerts
the end user and/or installer.
Receiver Troubles
Note: Also displayed with the receiver trouble code is the receiver number
("NN").
RF REC JAMMED - E16-NN. Transmitter interference from nearby radio-frequency
source.


<simpleNhumble@xxxxxxxxx> wrote in message
news:1165940730.137629.237600@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Dear Roland,

thanks once again for your precious time... i got the burst
principle....  is there any other approach to this...other than burst
.. the only other one i can think of is a base station which sends
alarm if the frequency channel is bocked continously for more than say
5 mins...

even rolling codes may not work... if the channel itself is blocked...
such that PIR radio signals donts reach the base station...  what say
you?

bye
SNH

Roland wrote:
> Your question might go beyond most wireless application questions and be
> one
> more for an electrical engineer with RF experience.
> Here is a site that describes their products relating to your question.
> Hope
> this helps.
> http://www.inovonics.com/whatToLookFor.php#question2
>
> In many commercial environments, ambient RF signals or signals from other
> wireless devices can interfere with a wireless security systems ability to
> operate effectively. But since Inovonics Wireless products are based on
> spread spectrum technology, reliability and range are maximized even in
> "noisy" environments. Inovonics Wireless is the only wireless security
> system based on proven Frequency Agile® 900 MHz technology. By sending
> completely redundant signals on a multitude of channels across a 10 MHz
> band, Inovonics Wireless products maximize reliability.
> <simpleNhumble@xxxxxxxxx> wrote in message
> news:1165936343.408520.86730@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> > Dear Roland and Frank,
> >
> > thanks for your valuable comments - for propriety sake i dont want to
> > mention brand name on this forum - but your valuable point is taken.
> >
> > For my understanding could you throw some light on burst transmission
> > devices and serial
> > number based systems and how they deal with and report RF jam
> >
> > thanks
> > SNH
> >
> >
> > Roland Moore wrote:
> >> I have only seen this on much old dip switch programmed units. Most
> >> serial
> >> number based systems today can deal with or report RF JAM.
> >> <simpleNhumble@xxxxxxxxx> wrote in message
> >> news:1165929419.290184.75650@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> >> > friends,
> >> >
> >> > we purchased a new DIY wireless home security system - and saw this
> >> > scary problem.... please do tell me if this is there with other
> >> > leading
> >> > products too...
> >> >
> >> > once the remotes/key fobs are programeed... and the system is
> >> > armed...
> >> > if i take an another unprogrammed remote/key fob... and then keep it
> >> > pressed continously... in effect jamming the signal frequency...the
> >> > base station doesnt catch the radio signals emitted by the P I R and
> >> > door s ens ors... in effect i can walk in to the system.. without
> >> > getting an alarm...
> >> >
> >> > is this the problem with some type of manufacturers or happens with
> >> > all
> >> > products - for the products which handle this properly - how do they
> >> > do
> >> > it... which could be some place where i can get such products...
> >> >
> >> > thanks
> >> > SNH
> >> >
> >