I totally agree. Say what you want about it being on FRS or that he's using crap CCR's the potential for harmful interference whether intentional or not is very real.Having a interest in sirens is fine, no harm done. But when he's playing with a transmitter and a peice of software that can send two tone paging then there's a strong chance it could blossom into trouble.
Sorry. I guess I don't see the humor in this.
I have nothing against people having unique interests or hobbies and nothing against this particular individual, but there's a right and a wrong way to do this type of "RF Experimentation" and he is clearly misguided thinking that his actions won't bother anyone or cause any issues.