Electric key fob frequency

[mark1968]

Hi All

Could anybody tell me how to work out what frequency my 93 XJS alarm system works on? I bought it without an existing fob, but I proved the system by getting it into the learning mode. I had bought a 433mhz fob, but my car did not recognise it. My reg is L120 CNF. VIN 189157
The number on the alarm system is DPP1051/02

Many Thanks

Mark

[ptjs1]

Mark,

UK alarm system is 418mhz

Paul

[PaulE]

Can anybody say how far away from the car the electronic fob should be effective? Mine works but is nowhere near as good as a modern car where it is possible to wave the fob in the general direction of the car from 50 to 100 yards for the locks to actuate.

My XJS one needs to be carefully aimed from standing next to the car, and then does not always work first time.

[PaulGover]

My '91 facelift has an aftermarket alarm that barely works if you hold the fob against the driver's door (which is near its aerial).

[davidr]

I find that I have to be quite close to my Celebration for the fob to work. My 350 will work from a fair distance away.
However, my wife's Discovery only works well when you're right next to the car unless you do the old trick of holding the key against your head so you become the antenna!
Regards
David