It is a well known truism that any alarm fiited 40 miles from home is going to be the one with the,never heard of problem

Customer phones up , hey great alarm , nice tidy job , well done , however when the postman rung the door bell the alarm went off (this is a wind up ) demonstration followed sure as hell it did

got to the house , discovered patio door viper triggering with door bell ,it was a hard percussive bell , so changed to softer avon calling type

still no joy

ran a screened cable along the flor to the viper and tried again, that cured it so had to run it screened permanent

now how many vipers and how many door bells have you in your books , has any one else ever come across this

Never heard of that one but a dogs bark can set them off, something to do with resonance im told!

B) Would'nt a Ferrite clamp at both ends of the cable helped on this one.

Adrian B)