If you like to purchase an alarm system go WIRED.
Wireless alarm systems are unreliable when there is a Transmitters in the vicinity operating:
- ON the wireless frequency
- Saturating the receiver
- provoking intermodulation
- having harmonics
- Falling aside in the receiver bandpass
- On the IF frequency
- and more... In essence the problems caused can be defined as a "Radio Frequency Interference (RFI)" and is the fact that by no way two (or more) systems can use simultaneously the same receiver input. THIS RFI muzzle and jeopardize completely the normal operation you expect from an alarm system.
Several pro's admit now that RFI exist and can't be avoided. In the same post they say that: - in "modern" systems RFI is detected.. - they had no warning since 20+ Years (they call that experience). Question: Are those "modern" systems with that marvelous RFI detection circuit existing since 20+ years?
WHAT CAN BE CONCLUDED OUT OF THAT?
- The unproved and manufacturer unsupported RFI detection system is inefficient or don't exist; OR
- RFI is NOT ALARMED/WARNED and in that case its easy to say that they had no warning since 20+ Years.
This last item (2.) seems the be the trued RFI is NOT WARNED, the remaining is pro's attempt to sell wireless systems without scrupulous, financial interest obliges.
Paul