car alarm

[andymac87]

why won't my car alarm work when its parked next to my house buts works elsewhere. Is it interfering with something in my house like a signal? could it be my house alarm?

[kevb0444]

I remember with one of my old cars that whenever i parked up near my local vets, the remote locking wouldn't work. It was right near a massive pylon...so i don't know if that had anything to do with it.

[Mr Songman]

Mine does that when I go to my friends house. I put it down to the fact that I have to park it beneath a telephone pole with lots of wires emanating from it but I don't really know if this is the case!

It only happens when I park there though!!

[kevb0444]

Hey songman...not a Rover by any chance?

[-scrumpy-]

There are problems if you park your car near a mobile telephone mast. If I remember correctly, the alarm manufacturers are not too careful about what frequency they use in the keyfob. Again, if I remember correctly, the frequencies used are very near those allocated to some mobile phone companies.

So, if you are near a mobile mast, the power of the mast is greater than your alarm keyfob, so "masks" the signal you're trying to transmit to your car.

[Spacecommand]

Is your friends house on a hill? Certain car alarms won't activate if they are at an angle. This auto deactivation is to make sure that the alarm doesn't go off constantly when cars get towed by a winch truck.

As for mobile phone masts affecting your fob, it's unlikely. Mobile phones work on 900/1800 Feq which is UHF and car alarm fobs work on HF.