The car is a 1996 Passat TDi - i.e. a deisel.

The radio interference is a clicking noise, present in weak FM areas, which 
is solely dependant on road speed. It speeds up as I go faster.

It continues even if I switch the engine off

The only electric device I can find related to the transmission is the 
sender for the speedometer. I tried disconnecting this and it made no 
difference.

I am stumped.

Any ideas?

-- 
Chris Melluish

In article ,
   Chris Melluish  wrote:
> The car is a 1996 Passat TDi - i.e. a deisel.

> The radio interference is a clicking noise, present in weak FM areas,
> which is solely dependant on road speed. It speeds up as I go faster.

> It continues even if I switch the engine off

> The only electric device I can find related to the transmission is the 
> sender for the speedometer. I tried disconnecting this and it made no 
> difference.

I doubt that would produce a click - more a whine. Other things that
actually *produce* a signal proportional to road speed could be the ABS
sensors.
 Other possibility some form of static discharge - that is likely to give
a click rather than whine.

-- 
*Virtual reality is its own reward*

    Dave Plowman        dave@davenoise.co.uk           London SW
                  To e-mail, change noise into sound.

"Chris Melluish"  wrote in message 
news:-IydnVen3dZeZwLVnZ2dneKdnZydnZ2d@bt.com...
> The car is a 1996 Passat TDi - i.e. a deisel.
>
> The radio interference is a clicking noise, present in weak FM areas, 
> which is solely dependant on road speed. It speeds up as I go faster.
>
> It continues even if I switch the engine off
>
> The only electric device I can find related to the transmission is the 
> sender for the speedometer. I tried disconnecting this and it made no 
> difference.
>
> I am stumped.
>
> Any ideas?
>
Try running a good earth between the metal body of the radio and the car 
body- you'd be surprised how much that can help.

"Dave Plowman (News)"  wrote in message 
news:4fcd1ced75dave@davenoise.co.uk...
> In article ,
>   Chris Melluish  wrote:
>> The car is a 1996 Passat TDi - i.e. a deisel.
>
>> The radio interference is a clicking noise, present in weak FM areas,
>> which is solely dependant on road speed. It speeds up as I go faster.
>
>> It continues even if I switch the engine off
>
>> The only electric device I can find related to the transmission is the
>> sender for the speedometer. I tried disconnecting this and it made no
>> difference.
>
> I doubt that would produce a click - more a whine. Other things that
> actually *produce* a signal proportional to road speed could be the ABS
> sensors.
> Other possibility some form of static discharge - that is likely to give
> a click rather than whine.
>
> -- 
> *Virtual reality is its own reward*
>
>    Dave Plowman        dave@davenoise.co.uk           London SW
>                  To e-mail, change noise into sound.

I don't have ABS.

--
Chris Melluish