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Re: [T3] Suppressing radio interference

On 5 Jan 2001, at 23:21, Andrew Davidson wrote:

> I've installed an AM/FM radio cassette in my 71
> fastback and I was wondering where I need to attach
> condensers to stop the crackle. I've put one on the
> generator but there's still a bit of interference.
> Where else should I put them?

I've found that the most important thing is to make sure that there 
is a good connection between the antenna cable shield and ground at 
the fender end of things. Pull the antenna cable out of the radio and 
check that you still have a good ground path with a VOM. 

I've had some old antennas which rotted out at the fender. They still 
looked good and seemed to have good reception, but they picked up a 
lot of noise. I eventually discovered that the cable shield was no 
longer "attached" to the antenna body at the fender and my only 
option was to replace the whole antenna. This made a whole lot of 
noise go away.

If you're getting a lot of ignition noise, then make sure that your 
spark plug wires have the Bosch 1k Ohm suppressors on the SP ends, 
and the 5kOhm Bosch rotor.

Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA

List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org

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