[Mobile-Portable] More noise cures

[Earl Needham]

Seems like Ford should have a procedure to make the vehicle useable for
public safety, utilities, etc.  If you were to ask the right person, you
could probably avoid a whole lot of trial and error.
Vy 7 3
Earl
KD5XB



On Sun, Jan 19, 2014 at 11:52 AM, <N1KHB at aol.com> wrote:

> Randy and all,
>    I just plugged in a search phrase of "fuel  injector electrical noise
> radiation" and received enough potentially useful  returns that it appears
> hopeful that some of the authors might have some  experience. I didn't read
> any, but the titles suggest promise.
>    And just off the top of my head, I'm  thinking back to my electronics
> experience. One of my solenoid (an  injector is a solenoid, right?)
> projects
> which radiated unacceptably was tamed  with ceramic bypass caps. Think
> risetime and thus bandwidth reduction here.  And way back in tech school
> we were
> told that connecting reverse biased diodes  across relay and solenoid coils
> never hurt and usually helped. The coil  resonates when power is removed
> abruptly and the first reverse alternation is  greatly suppressed by the
> diode
> becoming forward biased in that phase thus  quickly killing the noise
> burst.
>    I don't know if vehicle companies have either, or  any, such
> suppression. Something to investigate I suppose.
>
> Best,
> Sonny N1KHB
>
>
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