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Wierd one today

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SteveGoodz:
The central locking on my Japanese market Disco 1 won't work near the local fire station or leisure centre - think it's something to do with their comms frequencies :-(

Saffy:
no wonder all these cars keep pulling over to the hardshoulder around me when I am chatting away at 400watts UHF  :grin:  j/k, I think I have only set off shop alarms with low power.

Funny thing is that you have no legal protection against such RF interference if the equipment effected is not radio, it's the car manufactures fault for not building in adequate shielding.

Saffy:
The UHF ham radio repeater located at a hospital in Bristol had to be modified so that hospital staff could turn off the transmitter when someone complains they can not lock or unlock their vehicle in the car park. It boils down to the car manufactures making a poor choice in frequency to use compounded by using poor receiver design.


--- Quote ---While the incidents seem to be far & few between (at the moment) it has meant that while GB3BS is transmitting there is the possibility for Visitors & Staff at the hospital to become unable to use their remote keys. It must be pointed out that Remote Key systems that operate in the 418MHz allocation are not affected.

Some basic tests have been carried out and its been found that Vauxhall & Rover cars (there are more), which use the 433.920MHz allocation, are susceptible to this "Jamming" or blocking of the vehicles receiver. Tests also showed that the vehicles receiver was very poor at rejecting adjacent channel signals. The vehicles could be easily blocked by any low powered transmitter that was operating within 200 feet who's frequency was within plus or minus 4 MHz of the centre frequency, 433.920MHz.
--- End quote ---

http://www.iridium.demon.co.uk/gb3bs/close_down.htm

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