[RFI] BCB Noise in Ford Expedition

[david jordan]

Hi Jim,

I have a Ford 2001 Sport Trac....I found three sources of RFI in the 
vehicle.

1. - spark plug wires ( removed all radiation by running spark wires 
inside 1" braid that is grounded at the firewall, just above the ignitor)
2. - fuel pump noise ( removed by installation of CorCom  EMI/RFI ac 
line filter at the fuel pump harness closest to the fuel tank)
3. - ABS brake sensors (pending...plan to sheild sensor harness)

The RFI from the sources above present themselves as follows:

1. noise occurs when engine is running, idle or in motion
2. noise occurs when the engine is running, can be masked by  ignition 
noise. Can be heard when ignition key is turned to start engine but not 
cranking)
3. noise occurs only when vehicle is in motion, can be masked by 1 and 
2. noise speeds up and slows down with speed of vechicle.

Before remedies were applied for 1 and 2 AM reception was almost 
impossible. After resolving 1 and 2 I can now receive (when no in 
motion) weak low power AM stations such as those used for parking 
information at airports at distances of up to 10 miles.

Have Fun,
dave
wa3gin

JoshDC at aol.com wrote:

>My colleague has terrible noise afflicting AM broadcast band reception in his 
>2000 Ford Expedition (Eddie Bauer model) with 8 cyl. 5.4L engine.  Ham Band 
>reception is virtually impossible.  The BC radio is standard factory model.  BC 
>AM signals are covered over with lots of noise, rendering AM BC stations 
>unlistenable unless he is within their city-grade 5 mv/m contours.  Any tips for 
>remedying, or at least bringing down the level of, the noise/hash problems in 
>this particular vehicle?  Thanks in advance for your suggestions.
>
>Jim K3JW
>Washington DC
>jim at newworldradio.com
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