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Re: [RFI] Mobile amps and vehicle issues

To: rfi@contesting.com
Subject: Re: [RFI] Mobile amps and vehicle issues
From: Kelly Johnson <n6kj.kelly@gmail.com>
Date: Wed, 11 Jan 2006 14:50:18 -0800
List-post: <mailto:rfi@contesting.com>
What is even more pathetic is how little the dealer's techs seem to know
about their vehicles.  I owned an Infiniti and called the tech service
office at my local dealer asking them where I can get 12V @15 or 20 amps to
power a rig.  They had no clue.  I also asked them where I could find a hole
in the firewall where I could run a power cable through to the battery.
They couldn't tell me that either.  I'll bet the local stereo installers
know more than the dealer about stuff like this.

On 1/11/06, FoMoCo EMC <fomoco_emc@hotmail.com> wrote:
> It would be great if auto manufacturers offered that option or even had
> good
> technical service bulletins to inform you as to what modifications would
> be
> required to obtain a quieter vehicle.
> The trouble is that from an emissions standpoint the vehicle is like an
> onion.  You peel the first layer of noise by elimininating the ignition
> noise.  Now you can hear the cooling fan and fuel pump so you peel that
> layer by fixing those issues.  This keeps going until you finally get to a
> level (layer) that you can tolerate for weak signal work, but by that time
> you have modified the wiring harness, fuel pump, fuel pump driver module,
> cooling fan control module, engine control module, ignition coil, plugs,
> and
> ignition wires.
> The cost of having this level of differentiation is large enough that when
> weighed against the benefit of the added sales from the option that it is
> a
> loss to the manufacturer.  With the manufacturers in red ink anything that
> adds cost is carefully scrutinized.
> Still the best bet for resolving these issues is through forums like
> rfi@contesting.com.   The manufacturers can't offer the help at the level
> that most hams need.  Call any of the manufacturers and they will tell you
> to take it up with the dealer and then when it appears as a blip on the
> monthly warranty reports there might be some resolution coming from the
> factory.
> EMC Guy
> >From: David Jordan <wa3gin@erols.com>
> >To: FoMoCo EMC <fomoco_emc@hotmail.com>
> >CC: rfi@contesting.com
> >Subject: Re: [RFI] Mobile amps and vehicle issues
> >Date: Wed, 11 Jan 2006 13:23:07 -0500
> >
> >
> >Hey,
> >
> >Ford should consider offering the option for better noise suppression.
> >Most mobile rigs are costing over $1,000 bucks these days and on-board
> >computer controllers can be equally expensive.  I think Ford might be
> >surprised just how many radio operators would be willing to spend another
> >$50 or $100 bucks to ensure a relatively noise free and safe ride!
> >
> >I've got the noise reduced so much in my Sport Trac I can hear the noise
> >from the anti-lock brake sensors on my AM radio, haha.
> >
> >73,
> >dave
> >wa3gin
> >
> >FoMoCo EMC wrote:
> >
> >>It may be shameful but it is going to be the shape of things to come.
> >>
> >>Susceptible circuitry is rampant in a vehicle.  Almost every electric
> >>motor in a vehicle is speed controlled by a pulse width modulated
> signal.
> >>A little bit of RF into the circuit and the motor will exhibit undesired
> >>RPM variations.  There are a dozen sensors on the engine and throughout
> >>the vehicle that put out low level signals that can be
> disrupted.  Imagine
> >>what occurs when the vehicle can no longer tell if tire rotation is
> >>occuring (wheel speed sensors) or can't determine the postion of the
> >>camshaft, crankshaft, or throttle plate.
> >>
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