dold@XReXXHowXg.usenet.us.com coughed up:
> In rec.autos.makers.honda remcow <whybcuz@yahoo.com> wrote:
>> For instance, if you need ground/power for a two way FM radio, the
>> best spot is the ground/power lug of your battery. Tapping it
>> anywhere else and you'll have currents with other devices in common.
>> Quite often you'll hear the
>
> That reminds me of a point that I was going to make in response to the
> subject line, but I got distracted by the content ;-)
>
> How ground is ground? Not very.
>
> In high powered radar systems, it was common to run a scope probe
> along the edge of the chassis, on "ground", looking for signal. When
> you didn't see any, you were at the failed stage of the amplifier.
>
> Ground in automobiles is a nebulous thing. Watch the brake lights and
> taillights that have strange interaction on almost any Volvo, and some
> Cadillac Sevilles. As the driver steps on the brake, the taillight
> goes out and the brake light comes on. "poor ground".
>
> "The chassis" is probably a good ground, but that's sometimes hard to
> locate. I can't recall which car I was trying to work on... Even the
> metal parts of the dashboard weren't grounded well.
>
> On the Honda Civic, there are huge reinforcing bars in the dash, that
> I would assume were a good ground, and the return wire for the
> accessory outlet bolts to that.

Interesting.

I think part of my problem here is that I don't have a solid understanding
of what the difference is between impedance and resistance. I'll have to
study this up more. 20+ years ago in college, the extent of my electrical
experience was EE. TTL circuitry and the like----wiring up flip flops and
all that. The analog universe I've learned on my own, which leaves
significant holes in my understanding.


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