> -----Original Message-----
> From: Robert Johnson [ mailto:[email protected]]
> Sent: Friday, February 24, 2006 9:03 AM
> To: [email protected]
> Cc: [email protected]
> Subject: Re: Interesting UK EMC problem
>
> It would be interesting to analyze the failure mode. I assume
> the headlights could be operated by rectifying the signal
> with enough energy to operate the headlight relay, but that
> sounds pretty intense. Is there any logic in some automotive
> circuits that could be more sensitive?
> Most speedometers are magnetically coupled unless they are
> digital., yet it mentioned the dial swinging. I can't imagine
> radar affecting a typical speedometer.
> Bob
>
> Iain wrote:
>
> > Attached is an interesting BBC news item about effects on
> cars driving
> > through a Royal Air Force Air Defence Radar.
> >
> > http://news.bbc.co.uk/1/hi/england/norfolk/4732096.stm
> >
> > Obviously car manufacturers don't expect their cars to come across
> > hundreds of kilowatts under "normal use".
> >
> > Iain
Reports of responses in a wide variety of vehicles would require a rather
intense field. However, I find the following quote from the article very
intriguing:
"An MoD spokeswoman said: "We are aware of claims that the remote radar head
may be interfering with car immobilisers and we are investigating."
Are British vehicles fitted with some kind of standardized system that can
remotely disable the vehicle? What is an "immobilizer"? An improper response
of a system like that could be the answer, since it may respond to much lower
field strengths. The illuminating radar might be causing an out-of-band
response through the immobilizer's RF port.
Ed Price
[email protected] WB6WSN
NARTE Certified EMC Engineer & Technician
Electromagnetic Compatibility Lab
Cubic Defense Applications
San Diego, CA USA
858-505-2780 (Voice)
858-505-1583 (Fax)
Military & Avionics EMC Is Our Specialty
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