Car alarm remote

[Andrew S]

I have fitted a Vixen (Maplins) car alarm and all is working well. I only have one remote fob so decided to try and get a spare after all these years. Theoriginal fob is not available and soI have discussed it with Maplin in the shop and they do a universal one that looks a bit more up to-date.

On the back of my old fob, it has MPT 1340and is a 2 button remote so I can turn the alarm on and off quietly if needed. AlthoughI haven't seen the screen, Maplins stated that this fob operateson 433 mhz frequency. The remote replacement shows a range of between min 432.90 to 434.100mhz.

I have just disconnected my Stag battery and also the battery back up and what ever I do, Ijust cant get it to operate my alarm. What you normally do is disconnect the batteries and then just hold down the operating button and it all chirps and codes up, new remote wont.

The remote I bought was Maplins RNF6.

http://www.maplin.co.uk/module.aspx?moduleno=30323

and the old fob is shown on the right here

http://www.radioandtelly.co.uk/shop/...yfobs_6354.htm

I don't suppose anyone has any suggestions to they? I am not up on electronics. A friend of mine has the fob on the left and this wont operate either

Any help much appreciated as always

Cheers

Andrew

[KOY 23]

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Hello Andrew.

The operating frequency is fine. There is a frequency band allocated which is loosely called 433MHz, so that will not be the issue. Where your problem lies is in the coding. Each system has to have a different code so that you do not operate other alarms. Now most systems are rolling code, i.e. the code changes after each transmission, so that it cannot be copied. The keyloq system is now almost universally used and is very secure and is in the replacement fob you have. I do not know what coding is in your original Vixen fob. If you could open it up and let me have the numbers off the black "beetle" inside, it would give us a clue. If there is a row of switches that would mean it is a fixed code, which would be very good news.

If your earlier fob uses keyloq your problems are not over. The coding consists of two parts, fixed and rolling. The fixed part is programmed to a specific car or alarm maker. They are very secretive about "their" code, so that you have to go to their agent to have keys reprogrammed, at vast cost!!!

John.

[Andrew S]

imported post

Thanks John. I will have a look inside the fob and let you know

Cheers

Andrew

[KOY 23]

imported post

Hello Andrew.

Yes, please let me know but if it is a Foxguard rolling code, then these people should be able to help: http://www.bridgwater-electronics.co...7_Foxguard.php

Note Maplins sold Foxguard product, they used to be in Bridgwater, so I guess this company is run by ex Foxguard staff.

John.