I rent a house which has a General Electrics (Interlogix) home alarm system. I don't actually use the system, but it is switched on all the time, albeit not 'armed'.
I have erected a vertical antenna for 160 meter band on my flat roof, with a quarter wave element supported by an 18m Spiderbeam pole and radials on the flat roof. The SWR is about 1:1.3 without use of an ATU.
Unfortunately, when I transmit, the very loud audible alarm of the NX4 goes off, even though the alarm system is not armed. I am operating an Icom 7300 barefoot, with 100 watts output.
Has anyone else had a similar problem with the NX4 (which is a popular home alarm system in the USA)? Is it possible to totally deactivate the alarm without cutting the AC power or back-up battery)? Thanks.