Re: 22. Are you an OLD or a NEW VICTIM of wireless alarm systems
Interference is avoided by repeatingly sending the signal across an FM band comparable in "width" to the FM band on your radio. That's a lot of frequencies to jam or otherwise have interference. One of the multiple signals is bound to get through and it only takes one. Because there's no wire (or EOL), the transmitter has to send check-in signals to ensure it is able to report an alarm (supervision). If the receiver doesn't see the check-in signals, it complains to the poor sap carrying the pager. So, it seems we're doing the best we can where it's unrealistic to use wire, Paul. If you have a better idea, I'd like to hear it.
read more and respond »Posted 5 years ago by mikey in Electronic Security in UK
