remote controller frequency

Could you please let us know what are the frequencies following items working on.
Is this frequency within the leagal limit.

Remote car centrle locking
garage door opener
wireless alarm system
wireless computer accessories.

Does those frequencies interfear with neighbour's similar equipments, or does it work on code system.


Your idea highly appreciated.

Thanks

mahinda jayasinghe said:

Could you please let us know what are the frequencies following items working on.
Is this frequency within the leagal limit.

Remote car centrle locking
garage door opener
wireless alarm system
wireless computer accessories.

Does those frequencies interfear with neighbour's similar equipments, or does it work on code system.


Your idea highly appreciated.

Thanks

Click to expand...

The frequencies are whatever the designer designed them for. About legality, if they are not imported and not self-made, then they are legal.
As for neighbour, all those devices are encoded, i.e. they have their own "serial numbers", so they won't (shouldn't) interfere with each-other.

All these devices are low power and operate within the unlicenced bands. Where in the world are you? In the UK there are unlicensed bands in the 418-433MHz region, there is one from 2.4GHz to 2.483GHz, there is another one around 800 or 900MHz, there are others aswell, and they depend on there you are in the world. The legal maximum in the UK is 50mW of radiated power, I think. Depending on the shift key, the effective range varies a lot.

There are coding schemes that make it very difficult for these devices to interfere with each other if they are used within the intended remit. 12 bit addresses are a very very common form of security or interferance reduction in point to point systems. In networked systems a channel seperation of x amount is used to provide effective performance, i.e. wireless computer networks.

thank you