[RFI] Mobile Noise in Toyota(s)

[David Gottschalk]

Jeff,
   Thanks this is very good information. I will try this and see what
happens. What bands were you seeing a S-9 level noise on?

Thanks,
David

On Wed, Sep 16, 2020 at 4:00 PM Jeff (W4DD) <w4dd09 at gmail.com> wrote:

> I have a 2008 Toyota Tacoma and had S-9 noise when running mobile.  I was
> able to reduce it greatly by grounding the tail pipe at the exhaust exit to
> the truck frame with a 1 inch strap and stainless steel hose clamp.  Used a
> quarter inch bolt on the frame side.
>
> The tail pipe is hung on rubber straps and was acting like an antenna for
> engine noise.  As a test, you can connect a clip lead between the end of
> the tail pipe and frame and see if it has any effect.
>
> I also tried various other groundind staps for the hood, front quarter
> panels, and roof but they had minimal impact.
>
> I use the mobile set-up for producing a RFI Map so maintaining a low noise
> floor is important.  The S meter usually runs between S-2 and S-4 depending
> on engine speed.
>
> Jeff, W4DD
>
>
> On Wed, Sep 16, 2020, 2:13 PM David Gottschalk <dave at highredline.com>
> wrote:
>
>> Howdy folks,
>>     I'm looking for some help and guidance in next steps I can do to
>> resolve a mobile noise issue I have. I'm stumped and not really sure what
>> else to try. I have a 1997 Toyota 4runner, and a 2003 Toyota Tacoma. Both
>> of them make horrible noise when the engine is running. After some initial
>> investigation, I thought it might be a bad coil pack/wires or even spark
>> plugs. I replaced all three of those with factory new parts on the Tacoma,
>> and it still makes this noise. It totally wipes out AM broadcast band to
>> about the 2m band. If anyone has experience with an issue like this or,
>> any
>> idea for other things to try I'd appreciate it greatly. Below is a video
>> of
>> the noise in my Tacoma, but this exact same noise happens in both cars. It
>> is radiated from something, not conducted as the radio was running off
>> battery (as you can see in the video).
>>
>> https://www.dropbox.com/s/hb0wmc2jyzm4d5n/2020-07-31%2017.35.36.mp4?dl=0
>>
>> 73,
>> David
>> KN4ZKT
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>