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Old January 27th 05, 04:38 PM
Tom's VR6
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In rec.autos.makers.vw.watercooled, fixit1 wrote:

>The problem is probably the antenna base is not properly grounding to the
>roof metal, a bit of rust etc. This ground is very important for the
>antena amplifier to function. Dc power is injected at the antena jack
>inside the OEM radio. If you want an aftermarket radio to work, an inline
>DC injector device is needed. Basically a coil capacitor combination. coil
>keeps the electical system form shorting the RF signal to ground, Capacitor
>passes the RF signal to the radio antenna input but keeps the DC form
>getting into radio and smoking components. DC lead of of inline device is
>normally connected to the power antena lead of radio or the amp turn on
>lead if no power antena lead.
>These inline RF amps are pretty reliable but they need good power and bad
>ground is normally the problem. However it means removing the head liner
>to access, unscrew the base and file the metal chassis to get at good
>clean metal.
>A normal antenna with no RF amp grounding is not critical to function.


I had variable AM reception, and flexing the base would restore good
reception for a only while. I tightened the big nut under the
headliner about 1/4 turn using a ViceGrip. That fixed it.

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