In Wireless alarm systems, the internal required wireless receiver is put during Radio Frequency Interference (RFI) in a position that he is UNABLE TO RECEIVE and DECODE ANY sensor signal and by consequence he is unable to give any kind of warning.
"ALL" wireless alarm system (new and old) uses SHARED frequencies who are unprotected and of free use. RFI is a normal deal on those shared frequencies due to the asynchronous burst principle who has to be used by the equipments (look at
The permanent system interference conflicts who occur due to the asynchronous bursts are normal and handled with ID decoding, however, an extern transmissions escape on this ID selection rule and render decoding nonexistent. Non system generated RFI's escape the system reliability possibility. A lot of external transmissions generate RFI, they are unpredictable and a unavoidable nuisances who muzzle the wireless alarm systems, that's the tradeoff limit of wireless alarm systems.
Go "wired" and have a more reliable system.
Paul